add missing release notes to HISTORY.md

2026-07-07 22:55:23 +08:00 · 2020-10-13 10:39:10 -07:00
1061 changed files with 35272 additions and 134372 deletions
@@ -5,9 +5,9 @@ orbs:
  slack: circleci/slack@3.4.2

 aliases:
-  - &notify-on-main-failure
+  - &notify-on-master-failure
    fail_only: true
-    only_for_branches: main
+    only_for_branches: master

 commands:
  install-pyenv-on-macos:
@@ -17,13 +17,6 @@ commands:
          command: |
            HOMEBREW_NO_AUTO_UPDATE=1 brew install pyenv

-  install-cmake-on-macos:
-    steps:
-      - run:
-          name: Install cmake on macos
-          command: |
-            HOMEBREW_NO_AUTO_UPDATE=1 brew install cmake
-
  increase-max-open-files-on-macos:
    steps:
      - run:
@@ -34,44 +27,25 @@ commands:
            sudo launchctl limit maxfiles 1048576

  pre-steps:
-    parameters:
-      python-version:
-        default: "3.5.9"
-        type: string
    steps:
      - checkout
-      - run: pyenv install --skip-existing <<parameters.python-version>>
-      - run: pyenv global <<parameters.python-version>>
+      - run: pyenv install --skip-existing 3.5.9
+      - run: pyenv global 3.5.9
      - run:
          name: Setup Environment Variables
          command: |
            echo "export GTEST_THROW_ON_FAILURE=0" >> $BASH_ENV
            echo "export GTEST_OUTPUT=\"xml:/tmp/test-results/\"" >> $BASH_ENV
            echo "export SKIP_FORMAT_BUCK_CHECKS=1" >> $BASH_ENV
-            echo "export GTEST_COLOR=1" >> $BASH_ENV
-            echo "export CTEST_OUTPUT_ON_FAILURE=1" >> $BASH_ENV
-            echo "export CTEST_TEST_TIMEOUT=300" >> $BASH_ENV
-
-  pre-steps-macos:
-      steps:
-        - pre-steps:
-            python-version: "3.6.0"
+            echo "export PRINT_PARALLEL_OUTPUTS=1" >> $BASH_ENV

  post-steps:
    steps:
-      - slack/status: *notify-on-main-failure
+      - slack/status: *notify-on-master-failure
      - store_test_results: # store test result if there's any
          path: /tmp/test-results
      - store_artifacts: # store LOG for debugging if there's any
          path: LOG
-      - run: # on fail, compress Test Logs for diagnosing the issue
-         name: Compress Test Logs
-         command: tar -cvzf t.tar.gz t
-         when: on_fail
-      - store_artifacts: # on fail, store Test Logs for diagnosing the issue
-          path: t.tar.gz
-          destination: test_logs
-          when: on_fail

  install-clang-10:
    steps:
@@ -89,29 +63,7 @@ commands:
          name: Install gflags
          command: |
            sudo apt-get update -y && sudo apt-get install -y libgflags-dev
-
-  install-benchmark:
-    steps:
-      - run: # currently doesn't support ubuntu-1604 which doesn't have libbenchmark package, user can still install by building it youself
-          name: Install benchmark
-          command: |
-            sudo apt-get update -y && sudo apt-get install -y libbenchmark-dev
-
-  install-librados:
-    steps:
-      - run:
-          name: Install librados
-          command: |
-            sudo apt-get update -y && sudo apt-get install -y librados-dev
-
-  upgrade-cmake:
-    steps:
-      - run:
-          name: Upgrade cmake
-          command: |
-            sudo apt remove --purge cmake
-            sudo snap install cmake --classic
-
+  
  install-gflags-on-macos:
    steps:
      - run:
@@ -125,14 +77,7 @@ commands:
          name: Install gtest-parallel
          command: |
            git clone --single-branch --branch master --depth 1 https://github.com/google/gtest-parallel.git ~/gtest-parallel
-            echo 'export PATH=$HOME/gtest-parallel:$PATH' >> $BASH_ENV
-
-  install-compression-libs:
-    steps:
-      - run:
-          name: Install compression libs
-          command: |
-            sudo apt-get update -y && sudo apt-get install -y libsnappy-dev zlib1g-dev libbz2-dev liblz4-dev libzstd-dev
+            echo "export PATH=$HOME/gtest-parallel:$PATH" >> $BASH_ENV

 executors:
  windows-2xlarge:
@@ -145,79 +90,44 @@ jobs:
  build-macos:
    macos:
      xcode: 11.3.0
-    resource_class: large
    steps:
      - increase-max-open-files-on-macos
      - install-pyenv-on-macos
+      - pre-steps
      - install-gflags-on-macos
-      - pre-steps-macos
-      - run: ulimit -S -n 1048576 && OPT=-DCIRCLECI make V=1 J=32 -j32 check 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-macos-cmake:
-    macos:
-      xcode: 11.3.0
-    resource_class: large
-    steps:
-      - increase-max-open-files-on-macos
-      - install-pyenv-on-macos
-      - install-cmake-on-macos
-      - install-gflags-on-macos
-      - pre-steps-macos
-      - run: ulimit -S -n 1048576 && (mkdir build && cd build && cmake -DWITH_GFLAGS=1 .. && make V=1 -j32 && ctest -j10) 2>&1 | .circleci/cat_ignore_eagain
+      - run: ulimit -S -n 1048576 && OPT=-DCIRCLECI make V=1 J=32 -j32 check | .circleci/cat_ignore_eagain
      - post-steps

  build-linux:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
-      - run: make V=1 J=32 -j32 check 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-linux-mem-env-librados:
-    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: 2xlarge
-    steps:
-      - pre-steps
-      - install-gflags
-      - install-librados
-      - run: MEM_ENV=1 ROCKSDB_USE_LIBRADOS=1 make V=1 J=32 -j32 check 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-linux-encrypted-env:
-    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: 2xlarge
-    steps:
-      - pre-steps
-      - install-gflags
-      - run: ENCRYPTED_ENV=1 make V=1 J=32 -j32 check 2>&1 | .circleci/cat_ignore_eagain
+      - run: make V=1 J=32 -j32 check | .circleci/cat_ignore_eagain
      - post-steps

  build-linux-shared_lib-alt_namespace-status_checked:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
-      - run: ASSERT_STATUS_CHECKED=1 TEST_UINT128_COMPAT=1 ROCKSDB_MODIFY_NPHASH=1 LIB_MODE=shared OPT="-DROCKSDB_NAMESPACE=alternative_rocksdb_ns" make V=1 -j32 check 2>&1 | .circleci/cat_ignore_eagain
+      - run: ASSERT_STATUS_CHECKED=1 TEST_UINT128_COMPAT=1 LIB_MODE=shared OPT="-DROCKSDB_NAMESPACE=alternative_rocksdb_ns" make V=1 -j32 all check_some | .circleci/cat_ignore_eagain
      - post-steps

  build-linux-release:
    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: large
+      image: ubuntu-1604:202007-01
+    resource_class: 2xlarge
    steps:
      - checkout # check out the code in the project directory
-      - run: make V=1 -j8 release 2>&1 | .circleci/cat_ignore_eagain
+      - run: make V=1 -j32 release | .circleci/cat_ignore_eagain
      - run: if ./db_stress --version; then false; else true; fi # ensure without gflags
      - install-gflags
-      - run: make V=1 -j8 release 2>&1 | .circleci/cat_ignore_eagain
+      - run: make V=1 -j32 release | .circleci/cat_ignore_eagain
      - run: ./db_stress --version # ensure with gflags
      - post-steps

@@ -228,183 +138,118 @@ jobs:
    steps:
      - checkout # check out the code in the project directory
      - run: make clean
-      - run: USE_RTTI=1 DEBUG_LEVEL=0 make V=1 -j8 static_lib tools db_bench 2>&1 | .circleci/cat_ignore_eagain
+      - run: USE_RTTI=1 DEBUG_LEVEL=0 make V=1 -j16 static_lib tools db_bench | .circleci/cat_ignore_eagain
      - run: if ./db_stress --version; then false; else true; fi # ensure without gflags
      - run: sudo apt-get update -y && sudo apt-get install -y libgflags-dev
      - run: make clean
-      - run: USE_RTTI=1 DEBUG_LEVEL=0 make V=1 -j8 static_lib tools db_bench 2>&1 | .circleci/cat_ignore_eagain
+      - run: USE_RTTI=1 DEBUG_LEVEL=0 make V=1 -j16 static_lib tools db_bench | .circleci/cat_ignore_eagain
      - run: ./db_stress --version # ensure with gflags

  build-linux-lite:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
-      - run: LITE=1 make V=1 J=32 -j32 check 2>&1 | .circleci/cat_ignore_eagain
+      - run: LITE=1 make V=1 J=32 -j32 check | .circleci/cat_ignore_eagain
      - post-steps

  build-linux-lite-release:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: large
    steps:
      - checkout # check out the code in the project directory
-      - run: LITE=1 make V=1 -j8 release 2>&1 | .circleci/cat_ignore_eagain
+      - run: LITE=1 make V=1 -j32 release | .circleci/cat_ignore_eagain
      - run: if ./db_stress --version; then false; else true; fi # ensure without gflags
      - install-gflags
-      - run: LITE=1 make V=1 -j8 release 2>&1 | .circleci/cat_ignore_eagain
+      - run: LITE=1 make V=1 -j32 release | .circleci/cat_ignore_eagain
      - run: ./db_stress --version # ensure with gflags
      - post-steps

-  build-linux-clang-no_test_run:
+  build-linux-clang-no-test:
    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: xlarge
+      image: ubuntu-1604:202007-01
+    resource_class: 2xlarge
    steps:
      - checkout # check out the code in the project directory
-      - run: sudo apt-get update -y && sudo apt-get install -y clang libgflags-dev libtbb-dev
-      - run: CC=clang CXX=clang++ USE_CLANG=1 PORTABLE=1 make V=1 -j16 all 2>&1 | .circleci/cat_ignore_eagain
+      - run: sudo apt-get update -y && sudo apt-get install -y clang libgflags-dev
+      - run: CC=clang CXX=clang++ USE_CLANG=1 PORTABLE=1 make V=1 -j32 all | .circleci/cat_ignore_eagain
      - post-steps

  build-linux-clang10-asan:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
      - install-clang-10
-      - run: COMPILE_WITH_ASAN=1 CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 check 2>&1 | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out
+      - run: COMPILE_WITH_ASAN=1 CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 check | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out
      - post-steps

  build-linux-clang10-mini-tsan:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
      - install-clang-10
-      - run: COMPILE_WITH_TSAN=1 CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 check 2>&1 | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out.
+      - run: COMPILE_WITH_TSAN=1 CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 check | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out.
      - post-steps

  build-linux-clang10-ubsan:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
      - install-clang-10
-      - run: COMPILE_WITH_UBSAN=1 OPT="-fsanitize-blacklist=.circleci/ubsan_suppression_list.txt" CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 ubsan_check 2>&1 | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out
+      - run: COMPILE_WITH_UBSAN=1 OPT="-fsanitize-blacklist=.circleci/ubsan_suppression_list.txt" CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 ubsan_check | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out
      - post-steps

  build-linux-clang10-clang-analyze:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
      - install-clang-10
      - run: sudo apt-get update -y && sudo apt-get install -y clang-tools-10
-      - run: CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 CLANG_ANALYZER="/usr/bin/clang++-10" CLANG_SCAN_BUILD=scan-build-10 USE_CLANG=1 make V=1 -j32 analyze 2>&1 | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out. For unknown, reason passing "clang++-10" as CLANG_ANALYZER doesn't work, and we need a full path.
+      - run: CC=clang-10 CXX=clang++-10 ROCKSDB_DISABLE_ALIGNED_NEW=1 CLANG_ANALYZER="/usr/bin/clang++-10" CLANG_SCAN_BUILD=scan-build-10 USE_CLANG=1 make V=1 -j32 analyze | .circleci/cat_ignore_eagain # aligned new doesn't work for reason we haven't figured out. For unknown, reason passing "clang++-10" as CLANG_ANALYZER doesn't work, and we need a full path.
      - post-steps

  build-linux-cmake:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    steps:
-      - pre-steps
-      - install-gflags
-      - upgrade-cmake
-      - run: (mkdir build && cd build && cmake -DWITH_GFLAGS=1 .. && make V=1 -j20 && ctest -j20) 2>&1 | .circleci/cat_ignore_eagain
+      - checkout # check out the code in the project directory
+      - run: (mkdir build && cd build && cmake -DWITH_GFLAGS=0 .. && make V=1 -j32) | .circleci/cat_ignore_eagain
      - post-steps

-  build-linux-cmake-ubuntu-20:
-    machine:
-      image: ubuntu-2004:202104-01
-    resource_class: 2xlarge
-    steps:
-      - pre-steps
-      - install-gflags
-      - install-benchmark
-      - run: (mkdir build && cd build && cmake -DWITH_GFLAGS=1 -DWITH_BENCHMARK=1 .. && make V=1 -j20 && ctest -j20 && make microbench) 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-linux-unity-and-headers:
+  build-linux-unity:
    docker: # executor type
      - image: gcc:latest
-    resource_class: large
+    resource_class: xlarge
    steps:
      - checkout # check out the code in the project directory
      - run: apt-get update -y && apt-get install -y libgflags-dev
-      - run: TEST_TMPDIR=/dev/shm && make V=1 -j8 unity_test 2>&1 | .circleci/cat_ignore_eagain
-      - run: make V=1 -j8 -k check-headers 2>&1 | .circleci/cat_ignore_eagain # could be moved to a different build
+      - run: TEST_TMPDIR=/dev/shm && make V=1 -j16 unity_test | .circleci/cat_ignore_eagain
      - post-steps

-  build-linux-gcc-4_8-no_test_run:
+  build-linux-gcc-4-8:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: large
    steps:
      - pre-steps
      - run: sudo apt-get update -y && sudo apt-get install gcc-4.8 g++-4.8 libgflags-dev
-      - run: CC=gcc-4.8 CXX=g++-4.8 V=1 SKIP_LINK=1 make -j8 all 2>&1 | .circleci/cat_ignore_eagain # Linking broken because libgflags compiled with newer ABI
-      - post-steps
-
-  build-linux-gcc-8-no_test_run:
-    machine:
-      image: ubuntu-2004:202010-01
-    resource_class: large
-    steps:
-      - pre-steps
-      - run: sudo apt-get update -y && sudo apt-get install gcc-8 g++-8 libgflags-dev
-      - run: CC=gcc-8 CXX=g++-8 V=1 SKIP_LINK=1 make -j8 all 2>&1 | .circleci/cat_ignore_eagain # Linking broken because libgflags compiled with newer ABI
-      - post-steps
-
-  build-linux-gcc-9-no_test_run:
-    machine:
-      image: ubuntu-2004:202010-01
-    resource_class: large
-    steps:
-      - pre-steps
-      - run: sudo apt-get update -y && sudo apt-get install gcc-9 g++-9 libgflags-dev
-      - run: CC=gcc-9 CXX=g++-9 V=1 SKIP_LINK=1 make -j8 all 2>&1 | .circleci/cat_ignore_eagain # Linking broken because libgflags compiled with newer ABI
-      - post-steps
-
-  build-linux-gcc-10-cxx20-no_test_run:
-    machine:
-      image: ubuntu-2004:202010-01
-    resource_class: xlarge
-    steps:
-      - pre-steps
-      - run: sudo apt-get update -y && sudo apt-get install gcc-10 g++-10 libgflags-dev
-      - run: CC=gcc-10 CXX=g++-10 V=1 SKIP_LINK=1 ROCKSDB_CXX_STANDARD=c++20 make -j16 all 2>&1 | .circleci/cat_ignore_eagain # Linking broken because libgflags compiled with newer ABI
-      - post-steps
-
-  build-linux-gcc-11-no_test_run:
-    machine:
-      image: ubuntu-2004:202010-01
-    resource_class: xlarge
-    steps:
-      - pre-steps
-      - run: sudo apt-get update -y && sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test && sudo apt-get install gcc-11 g++-11 libgflags-dev
-      - run: CC=gcc-11 CXX=g++-11 V=1 SKIP_LINK=1 make -j16 all 2>&1 | .circleci/cat_ignore_eagain # Linking broken because libgflags compiled with newer ABI
-      - post-steps
-
-  # This job is only to make sure the microbench tests are able to run, the benchmark result is not meaningful as the CI host is changing.
-  build-linux-microbench:
-    machine:
-      image: ubuntu-2004:202010-01
-    resource_class: xlarge
-    steps:
-      - pre-steps
-      - install-benchmark
-      - run: DEBUG_LEVEL=0 make microbench 2>&1 | .circleci/cat_ignore_eagain
+      - run: CC=gcc-4.8 CXX=g++-4.8 V=1 SKIP_LINK=1 make -j4 all | .circleci/cat_ignore_eagain # Linking broken because libgflags compiled with newer ABI
      - post-steps

  build-windows:
@@ -433,17 +278,11 @@ jobs:
      - run:
          name: "Setup VS"
          command: |
-            if [[ "${VS_YEAR}" == "2019" ]]; then
-              echo "VS2019 already present."
-            elif [[ "${VS_YEAR}" == "2017" ]]; then
-              echo "Installing VS2017..."
+            if [[ "${VS_YEAR}" == "2017" ]]; then
              powershell .circleci/vs2017_install.ps1
            elif [[ "${VS_YEAR}" == "2015" ]]; then
-              echo "Installing VS2015..."
              powershell .circleci/vs2015_install.ps1
            fi
-      - store_artifacts:
-          path: \Users\circleci\AppData\Local\Temp\vslogs.zip
      - run:
          name: "Install thirdparty dependencies"
          command: |
@@ -467,7 +306,6 @@ jobs:
            cd build
            ${CMAKE_BIN} -G "${CMAKE_GENERATOR}" -DCMAKE_BUILD_TYPE=Debug -DOPTDBG=1 -DPORTABLE=1 -DSNAPPY=1 -DJNI=1 << parameters.extra_cmake_opt >> ..
            cd ..
-            echo "Building with VS version: ${CMAKE_GENERATOR}"
            msbuild.exe build/rocksdb.sln -maxCpuCount -property:Configuration=Debug -property:Platform=x64
      - run:
          name: "Test RocksDB"
@@ -477,103 +315,26 @@ jobs:

  build-linux-java:
    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: large
-    environment:
-      JAVA_HOME: /usr/lib/jvm/java-1.8.0-openjdk-amd64
+      image: ubuntu-1604:202007-01
+    resource_class: 2xlarge
    steps:
      - pre-steps
      - install-gflags
      - run:
-          name: "Set Java Environment"
+          name: "Build RocksDBJava"
          command: |
+            export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64
+            export PATH=$JAVA_HOME/bin:$PATH
            echo "JAVA_HOME=${JAVA_HOME}"
-            echo 'export PATH=$JAVA_HOME/bin:$PATH' >> $BASH_ENV
            which java && java -version
            which javac && javac -version
-      - run:
-          name: "Build RocksDBJava Shared Library"
-          command: make V=1 J=8 -j8 rocksdbjava 2>&1 | .circleci/cat_ignore_eagain
-      - run:
-          name: "Test RocksDBJava"
-          command: make V=1 J=8 -j8 jtest 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-linux-java-static:
-    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: large
-    environment:
-      JAVA_HOME: /usr/lib/jvm/java-1.8.0-openjdk-amd64
-    steps:
-      - pre-steps
-      - install-gflags
-      - run:
-          name: "Set Java Environment"
-          command: |
-            echo "JAVA_HOME=${JAVA_HOME}"
-            echo 'export PATH=$JAVA_HOME/bin:$PATH' >> $BASH_ENV
-            which java && java -version
-            which javac && javac -version
-      - run:
-          name: "Build RocksDBJava Static Library"
-          command: make V=1 J=8 -j8 rocksdbjavastatic 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-macos-java:
-    macos:
-      xcode: 11.3.0
-    resource_class: medium
-    environment:
-      JAVA_HOME: /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home
-    steps:
-      - increase-max-open-files-on-macos
-      - install-pyenv-on-macos
-      - install-gflags-on-macos
-      - pre-steps-macos
-      - run:
-          name: "Set Java Environment"
-          command: |
-            echo "JAVA_HOME=${JAVA_HOME}"
-            echo 'export PATH=$JAVA_HOME/bin:$PATH' >> $BASH_ENV
-            which java && java -version
-            which javac && javac -version
-      - run:
-          name: "Build RocksDBJava Shared Library"
-          command: make V=1 J=8 -j8 rocksdbjava 2>&1 | .circleci/cat_ignore_eagain
-      - run:
-          name: "Test RocksDBJava"
-          command: make V=1 J=8 -j8 jtest 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-macos-java-static:
-    macos:
-      xcode: 11.3.0
-    resource_class: medium
-    environment:
-      JAVA_HOME: /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home
-    steps:
-      - increase-max-open-files-on-macos
-      - install-pyenv-on-macos
-      - install-gflags-on-macos
-      - install-cmake-on-macos
-      - pre-steps-macos
-      - run:
-          name: "Set Java Environment"
-          command: |
-            echo "JAVA_HOME=${JAVA_HOME}"
-            echo 'export PATH=$JAVA_HOME/bin:$PATH' >> $BASH_ENV
-            which java && java -version
-            which javac && javac -version
-      - run:
-          name: "Build RocksDBJava Static Library"
-          command: make V=1 J=8 -j8 rocksdbjavastatic 2>&1 | .circleci/cat_ignore_eagain
+            make V=1 J=32 -j32 rocksdbjava jtest | .circleci/cat_ignore_eagain
      - post-steps

  build-examples:
    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: large
+      image: ubuntu-1604:202007-01
+    resource_class: medium
    steps:
      - pre-steps
      - install-gflags
@@ -583,32 +344,9 @@ jobs:
            OPT=-DTRAVIS V=1 make -j4 static_lib && cd examples && make -j4 | ../.circleci/cat_ignore_eagain
      - post-steps

-  build-cmake-mingw:
-    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: 2xlarge
-    steps:
-      - pre-steps
-      - install-gflags
-      - run: sudo apt-get update -y && sudo apt-get install -y mingw-w64
-      - run: sudo update-alternatives --set x86_64-w64-mingw32-g++ /usr/bin/x86_64-w64-mingw32-g++-posix
-      - run:
-          name: "Build cmake-mingw"
-          command: |
-            sudo apt-get install snapd && sudo snap install cmake --beta --classic
-            export PATH=/snap/bin:$PATH
-            sudo apt-get install -y openjdk-8-jdk
-            export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
-            export PATH=$JAVA_HOME/bin:$PATH
-            echo "JAVA_HOME=${JAVA_HOME}"
-            which java && java -version
-            which javac && javac -version
-            mkdir build && cd build && cmake -DJNI=1 -DWITH_GFLAGS=OFF .. -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++ -DCMAKE_SYSTEM_NAME=Windows && make -j4 rocksdb rocksdbjni
-      - post-steps
-
  build-linux-non-shm:
    machine:
-      image: ubuntu-1604:202104-01
+      image: ubuntu-1604:202007-01
    resource_class: 2xlarge
    parameters:
      start_test:
@@ -633,94 +371,13 @@ jobs:
            sed -i 's/[[:space:]]*$//; s/ / \.\//g; s/.*/.\/&/' /tmp/test_list
            cat /tmp/test_list
            export TEST_TMPDIR=/tmp/rocksdb_test_tmp
-            gtest-parallel $(</tmp/test_list) --output_dir=/tmp | cat  # pipe to cat to continuously output status on circleci UI. Otherwise, no status will be printed while the job is running.
-      - post-steps
-
-  build-linux-arm-test-full:
-    machine:
-      image: ubuntu-2004:202101-01
-    resource_class: arm.large
-    steps:
-      - pre-steps
-      - install-gflags
-      - run: make V=1 J=4 -j4 check 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-linux-arm:
-    machine:
-      image: ubuntu-2004:202101-01
-    resource_class: arm.large
-    steps:
-      - pre-steps
-      - install-gflags
-      - run: ROCKSDBTESTS_PLATFORM_DEPENDENT=only make V=1 J=4 -j4 all_but_some_tests check_some 2>&1 | .circleci/cat_ignore_eagain
-      - post-steps
-
-  build-linux-arm-cmake-no_test_run:
-    machine:
-      image: ubuntu-2004:202101-01
-    resource_class: arm.large
-    environment:
-      JAVA_HOME: /usr/lib/jvm/java-8-openjdk-arm64
-    steps:
-      - pre-steps
-      - install-gflags
-      - run:
-          name: "Set Java Environment"
-          command: |
-            echo "JAVA_HOME=${JAVA_HOME}"
-            echo 'export PATH=$JAVA_HOME/bin:$PATH' >> $BASH_ENV
-            which java && java -version
-            which javac && javac -version
-      - run:
-          name: "Build with cmake"
-          command: |
-            mkdir build
-            cd build
-            cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=0 -DWITH_GFLAGS=1 -DWITH_BENCHMARK_TOOLS=0 -DWITH_TOOLS=0 -DWITH_CORE_TOOLS=1 ..
-            make -j4
-      - run:
-          name: "Build Java with cmake"
-          command: |
-            rm -rf build
-            mkdir build
-            cd build
-            cmake -DJNI=1 -DCMAKE_BUILD_TYPE=Release -DWITH_GFLAGS=1 ..
-            make -j4 rocksdb rocksdbjni
-      - post-steps
-
-  build-format-compatible:
-    machine:
-      image: ubuntu-1604:202104-01
-    resource_class: 2xlarge
-    steps:
-      - pre-steps
-      - install-gflags
-      - install-compression-libs
-      - run:
-          name: "test"
-          command: |
-            export TEST_TMPDIR=/dev/shm/rocksdb
-            rm -rf /dev/shm/rocksdb
-            mkdir /dev/shm/rocksdb
-            tools/check_format_compatible.sh
+            /usr/bin/python ../gtest-parallel/gtest-parallel $(</tmp/test_list) --output_dir=/tmp | cat  # pipe to cat to continuously output status on circleci UI. Otherwise, no status will be printed while the job is running.
      - post-steps

 workflows:
-  version: 2
  build-linux:
    jobs:
      - build-linux
-  build-linux-cmake:
-    jobs:
-      - build-linux-cmake
-      - build-linux-cmake-ubuntu-20
-  build-linux-mem-env-librados:
-    jobs:
-      - build-linux-mem-env-librados
-  build-linux-encrypted-env:
-    jobs:
-      - build-linux-encrypted-env
  build-linux-shared_lib-alt_namespace-status_checked:
    jobs:
      - build-linux-shared_lib-alt_namespace-status_checked
@@ -736,6 +393,9 @@ workflows:
  build-linux-lite-release:
    jobs:
      - build-linux-lite-release
+  build-linux-clang-no-test:
+    jobs:
+      - build-linux-clang-no-test
  build-linux-clang10-asan:
    jobs:
      - build-linux-clang10-asan
@@ -748,30 +408,32 @@ workflows:
  build-linux-clang10-clang-analyze:
    jobs:
      - build-linux-clang10-clang-analyze
-  build-linux-unity-and-headers:
+  build-linux-cmake:
    jobs:
-      - build-linux-unity-and-headers
-  build-windows-vs2019:
+      - build-linux-cmake
+  build-linux-unity:
    jobs:
-      - build-windows:
-          name: "build-windows-vs2019"
-  build-windows-vs2019-cxx20:
+      - build-linux-unity
+  build-windows:
    jobs:
-      - build-windows:
-          name: "build-windows-vs2019-cxx20"
-          extra_cmake_opt: -DCMAKE_CXX_STANDARD=20
+      - build-windows
  build-windows-vs2017:
    jobs:
      - build-windows:
-          name: "build-windows-vs2017"
          vs_year: "2017"
          cmake_generator: "Visual Studio 15 Win64"
+  build-windows-vs2015:
+    jobs:
+      - build-windows:
+          vs_year: "2015"
+          cmake_generator: "Visual Studio 14 Win64"
+  build-windows-cxx20:
+    jobs:
+      - build-windows:
+          extra_cmake_opt: -DCMAKE_CXX_STANDARD=20
  build-java:
    jobs:
      - build-linux-java
-      - build-linux-java-static
-      - build-macos-java
-      - build-macos-java-static
  build-examples:
    jobs:
      - build-examples
@@ -789,38 +451,9 @@ workflows:
      - build-linux-non-shm:
          start_test: "statistics_test" # make sure unique in src.mk
          end_test: ""
-  build-linux-compilers-no_test_run:
+  build-linux-gcc-4-8:
    jobs:
-      - build-linux-clang-no_test_run
-      - build-linux-gcc-4_8-no_test_run
-      - build-linux-gcc-8-no_test_run
-      - build-linux-gcc-9-no_test_run
-      - build-linux-gcc-10-cxx20-no_test_run
-      - build-linux-gcc-11-no_test_run
-      - build-linux-arm-cmake-no_test_run
+      - build-linux-gcc-4-8
  build-macos:
    jobs:
      - build-macos
-  build-macos-cmake:
-    jobs:
-      - build-macos-cmake
-  build-cmake-mingw:
-    jobs:
-      - build-cmake-mingw
-  build-linux-arm:
-    jobs:
-      - build-linux-arm
-  build-microbench:
-    jobs:
-      - build-linux-microbench
-  nightly:
-    triggers:
-      - schedule:
-          cron: "0 0 * * *"
-          filters:
-            branches:
-              only:
-                - main
-    jobs:
-      - build-format-compatible
-      - build-linux-arm-test-full
@@ -10,7 +10,7 @@ $process = Start-Process "${PWD}\vs_installer.exe" -ArgumentList $VS_INSTALL_ARG
 Remove-Item -Path vs_installer.exe -Force
 $exitCode = $process.ExitCode
 if (($exitCode -ne 0) -and ($exitCode -ne 3010)) {
-    echo "VS 2015 installer exited with code $exitCode, which should be one of [0, 3010]."
+    echo "VS 2017 installer exited with code $exitCode, which should be one of [0, 3010]."
    curl.exe --retry 3 -kL $COLLECT_DOWNLOAD_LINK --output Collect.exe
    if ($LASTEXITCODE -ne 0) {
        echo "Download of the VS Collect tool failed."
@@ -21,4 +21,3 @@ if (($exitCode -ne 0) -and ($exitCode -ne 3010)) {
    Copy-Item -Path "C:\Users\circleci\AppData\Local\Temp\vslogs.zip" -Destination "C:\w\build-results\"
    exit 1
 }
-echo "VS 2015 installed."
@@ -32,4 +32,3 @@ if (($exitCode -ne 0) -and ($exitCode -ne 3010)) {
    Copy-Item -Path "C:\Users\circleci\AppData\Local\Temp\vslogs.zip" -Destination "C:\w\build-results\"
    exit 1
 }
-echo "VS 2017 installed."
@@ -32,13 +32,10 @@ jobs:
    - name: Download clang-format-diff.py
      uses: wei/wget@v1
      with:
-        args: https://raw.githubusercontent.com/llvm/llvm-project/main/clang/tools/clang-format/clang-format-diff.py
+        args: https://raw.githubusercontent.com/llvm-mirror/clang/master/tools/clang-format/clang-format-diff.py

    - name: Check format
      run: VERBOSE_CHECK=1 make check-format

    - name: Compare buckify output
      run: make check-buck-targets
-
-    - name: Simple source code checks
-      run: make check-sources
@@ -8,7 +8,6 @@ rocksdb.pc
 *.gcda
 *.gcno
 *.o
-*.o.tmp
 *.so
 *.so.*
 *_test
@@ -90,8 +89,3 @@ buckifier/__pycache__
 compile_commands.json
 clang-format-diff.py
 .py3/
-
-fuzz/proto/gen/
-fuzz/crash-*
-
-cmake-build-*
@@ -2,19 +2,20 @@ dist: xenial
 language: cpp
 os:
  - linux
+  - osx
 arch:
+  - amd64
  - arm64
  - ppc64le
-  - s390x
 compiler:
  - clang
  - gcc
+osx_image: xcode9.4
 cache:
  - ccache

 addons:
  apt:
-    update: true
    sources:
      - ubuntu-toolchain-r-test
    packages:
@@ -25,6 +26,15 @@ addons:
      - liblzma-dev  # xv
      - libzstd-dev
      - zlib1g-dev
+  homebrew:
+    update: true
+    packages:
+      - ccache
+      - gflags
+      - lz4
+      - snappy
+      - xz
+      - zstd

 env:
  - TEST_GROUP=platform_dependent # 16-18 minutes
@@ -48,6 +58,20 @@ env:

 matrix:
  exclude:
+  - os: osx
+    env: JOB_NAME=cmake-gcc8
+  - os: osx
+    env: JOB_NAME=cmake-gcc9
+  - os: osx
+    env: JOB_NAME=cmake-gcc9-c++20
+  - os: osx
+    env: JOB_NAME=cmake-mingw
+  - os: osx
+    env: JOB_NAME=make-gcc4.8
+  - os: osx
+    arch: ppc64le
+  - os: osx
+    compiler: gcc
  - os : linux
    arch: arm64
    env: JOB_NAME=cmake-mingw
@@ -60,70 +84,75 @@ matrix:
  - os: linux
    arch: ppc64le
    env: JOB_NAME=make-gcc4.8
-  - os: linux
-    arch: s390x
-    env: JOB_NAME=cmake-mingw
-  - os: linux
-    arch: s390x
-    env: JOB_NAME=make-gcc4.8
  - os: linux
    compiler: clang
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: arm64
-    env: TEST_GROUP=platform_dependent
+  # Exclude all but most unique cmake variants for pull requests, but build all in branches
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
-    arch: arm64
-    env: TEST_GROUP=1
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: ppc64le
-    env: TEST_GROUP=1
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: TEST_GROUP=1
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os : linux
-    arch: arm64
-    env: TEST_GROUP=2
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: ppc64le
-    env: TEST_GROUP=2
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: TEST_GROUP=2
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os : linux
-    arch: arm64
-    env: TEST_GROUP=3
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: ppc64le
-    env: TEST_GROUP=3
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: TEST_GROUP=3
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os : linux
-    arch: arm64
-    env: TEST_GROUP=4
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: ppc64le
-    env: TEST_GROUP=4
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: TEST_GROUP=4
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os : linux
-    arch: arm64
+    arch: amd64
    env: JOB_NAME=cmake
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : linux
+    arch: amd64
+    env: JOB_NAME=cmake-gcc8
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : linux
+    arch: amd64
+    env: JOB_NAME=cmake-gcc9
+  # Exclude most osx, arm64 and ppc64le tests for pull requests, but build in branches
+  # Temporarily disable ppc64le cmake test while snapd is broken
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: linux
+    arch: ppc64le
+    env: JOB_NAME=cmake
+  # NB: the cmake build is a partial java test
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: osx
+    env: TEST_GROUP=1
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : linux
+    arch: arm64
+    env: TEST_GROUP=1
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: linux
+    arch: ppc64le
+    env: TEST_GROUP=1
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: osx
+    env: TEST_GROUP=2
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : linux
+    arch: arm64
+    env: TEST_GROUP=2
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: linux
+    arch: ppc64le
+    env: TEST_GROUP=2
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: osx
+    env: TEST_GROUP=3
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : linux
+    arch: arm64
+    env: TEST_GROUP=3
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: linux
+    arch: ppc64le
+    env: TEST_GROUP=3
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: osx
+    env: TEST_GROUP=4
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : linux
+    arch: arm64
+    env: TEST_GROUP=4
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os: linux
+    arch: ppc64le
+    env: TEST_GROUP=4
+  - if: type = pull_request AND commit_message !~ /FULL_CI/ AND commit_message !~ /java/
+    os : osx
+    env: JOB_NAME=java_test
  - if: type = pull_request AND commit_message !~ /FULL_CI/ AND commit_message !~ /java/
    os : linux
    arch: arm64
@@ -132,10 +161,9 @@ matrix:
    os: linux
    arch: ppc64le
    env: JOB_NAME=java_test
-  - if: type = pull_request AND commit_message !~ /FULL_CI/ AND commit_message !~ /java/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=java_test
+  - if: type = pull_request AND commit_message !~ /FULL_CI/
+    os : osx
+    env: JOB_NAME=lite_build
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
    arch: arm64
@@ -145,9 +173,8 @@ matrix:
    arch: ppc64le
    env: JOB_NAME=lite_build
  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=lite_build
+    os : osx
+    env: JOB_NAME=examples
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
    arch: arm64
@@ -156,10 +183,6 @@ matrix:
    os: linux
    arch: ppc64le
    env: JOB_NAME=examples
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=examples
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
    arch: arm64
@@ -168,10 +191,6 @@ matrix:
    os: linux
    arch: ppc64le
    env: JOB_NAME=cmake-gcc8
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=cmake-gcc8
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
    arch: arm64
@@ -180,10 +199,6 @@ matrix:
    os: linux
    arch: ppc64le
    env: JOB_NAME=cmake-gcc9
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=cmake-gcc9
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
    arch: arm64
@@ -193,9 +208,8 @@ matrix:
    arch: ppc64le
    env: JOB_NAME=cmake-gcc9-c++20
  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=cmake-gcc9-c++20
+    os : osx
+    env: JOB_NAME=status_checked
  - if: type = pull_request AND commit_message !~ /FULL_CI/
    os : linux
    arch: arm64
@@ -204,12 +218,11 @@ matrix:
    os: linux
    arch: ppc64le
    env: JOB_NAME=status_checked
-  - if: type = pull_request AND commit_message !~ /FULL_CI/
-    os: linux
-    arch: s390x
-    env: JOB_NAME=status_checked

 install:
+  - if [ "${TRAVIS_OS_NAME}" == osx ]; then
+      PATH=$PATH:/usr/local/opt/ccache/libexec;
+    fi
  - if [ "${JOB_NAME}" == cmake-gcc8 ]; then
      sudo apt-get install -y g++-8 || exit $?;
      CC=gcc-8 && CXX=g++-8;
@@ -225,21 +238,22 @@ install:
      sudo apt-get install -y g++-4.8 || exit $?;
      CC=gcc-4.8 && CXX=g++-4.8;
    fi
-  - |
-    if [[ "${JOB_NAME}" == cmake* ]]; then
-      sudo apt-get remove -y cmake cmake-data
-      export CMAKE_DEB="cmake-3.14.5-Linux-$(uname -m).deb"
-      export CMAKE_DEB_URL="https://rocksdb-deps.s3-us-west-2.amazonaws.com/cmake/${CMAKE_DEB}"
-      curl --silent --fail --show-error --location --output "${CMAKE_DEB}" "${CMAKE_DEB_URL}" || exit $?
-      sudo dpkg -i "${CMAKE_DEB}" || exit $?
-      which cmake && cmake --version
+  - if [[ "${JOB_NAME}" == cmake* ]] && [ "${TRAVIS_OS_NAME}" == linux ]; then
+      sudo apt-get install snapd && sudo snap install cmake --beta --classic || exit $?;
+      export PATH=/snap/bin:$PATH;
    fi
  - |
    if [[ "${JOB_NAME}" == java_test || "${JOB_NAME}" == cmake* ]]; then
      # Ensure JDK 8
-      sudo apt-get install -y openjdk-8-jdk || exit $?
-      export PATH=/usr/lib/jvm/java-8-openjdk-$(dpkg --print-architecture)/bin:$PATH
-      export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-$(dpkg --print-architecture)
+      if [ "${TRAVIS_OS_NAME}" == osx ]; then
+        brew tap AdoptOpenJDK/openjdk || exit $?
+        brew cask install adoptopenjdk8 || exit $?
+        export JAVA_HOME=$(/usr/libexec/java_home)
+      else
+        sudo apt-get install -y openjdk-8-jdk || exit $?
+        export PATH=/usr/lib/jvm/java-8-openjdk-$(dpkg --print-architecture)/bin:$PATH
+        export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-$(dpkg --print-architecture)
+      fi
      echo "JAVA_HOME=${JAVA_HOME}"
      which java && java -version
      which javac && javac -version
@@ -255,30 +269,30 @@ script:
  - if [ `command -v ccache` ]; then ccache -C; fi
  - case $TEST_GROUP in
    platform_dependent)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=only make -j4 all_but_some_tests check_some
+      OPT=-DTRAVIS V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=only make -j4 all_but_some_tests check_some
      ;;
    1)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_END=backupable_db_test make -j4 check_some
+      OPT=-DTRAVIS V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_END=backupable_db_test make -j4 check_some
      ;;
    2)
-      OPT="-DTRAVIS -DROCKSDB_NAMESPACE=alternative_rocksdb_ns" LIB_MODE=shared V=1 make -j4 tools && OPT="-DTRAVIS -DROCKSDB_NAMESPACE=alternative_rocksdb_ns" LIB_MODE=shared V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_START=backupable_db_test ROCKSDBTESTS_END=db_universal_compaction_test make -j4 check_some
+      OPT="-DTRAVIS -DROCKSDB_NAMESPACE=alternative_rocksdb_ns" V=1 make -j4 tools && OPT="-DTRAVIS -DROCKSDB_NAMESPACE=alternative_rocksdb_ns" V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_START=backupable_db_test ROCKSDBTESTS_END=db_universal_compaction_test make -j4 check_some
      ;;
    3)
      OPT=-DTRAVIS LIB_MODE=shared V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_START=db_universal_compaction_test ROCKSDBTESTS_END=table_properties_collector_test make -j4 check_some
      ;;
    4)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_START=table_properties_collector_test make -j4 check_some
+      OPT=-DTRAVIS V=1 ROCKSDBTESTS_PLATFORM_DEPENDENT=exclude ROCKSDBTESTS_START=table_properties_collector_test make -j4 check_some
      ;;
    esac
  - case $JOB_NAME in
    java_test)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 make rocksdbjava jtest
+      OPT=-DTRAVIS V=1 make rocksdbjava jtest
      ;;
    lite_build)
-      OPT='-DTRAVIS -DROCKSDB_LITE' LIB_MODE=shared V=1 make -j4 all
+      OPT='-DTRAVIS -DROCKSDB_LITE' V=1 make -j4 all
      ;;
    examples)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 make -j4 static_lib && cd examples && make -j4
+      OPT=-DTRAVIS V=1 make -j4 static_lib && cd examples && make -j4
      ;;
    cmake-mingw)
      sudo update-alternatives --set x86_64-w64-mingw32-g++ /usr/bin/x86_64-w64-mingw32-g++-posix;
@@ -294,10 +308,10 @@ script:
      mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=0 -DWITH_GFLAGS=0 -DWITH_BENCHMARK_TOOLS=0 -DWITH_TOOLS=0 -DWITH_CORE_TOOLS=1 .. && make -j4 && cd  .. && rm -rf build && mkdir build && cd build && cmake -DJNI=1 .. -DCMAKE_BUILD_TYPE=Release $OPT && make -j4 rocksdb rocksdbjni
      ;;
    make-gcc4.8)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 SKIP_LINK=1 make -j4 all && [ "Linking broken because libgflags compiled with newer ABI" ]
+      OPT=-DTRAVIS V=1 SKIP_LINK=1 make -j4 all && [ "Linking broken because libgflags compiled with newer ABI" ]
      ;;
    status_checked)
-      OPT=-DTRAVIS LIB_MODE=shared V=1 ASSERT_STATUS_CHECKED=1 make -j4 check_some
+      OPT=-DTRAVIS V=1 ASSERT_STATUS_CHECKED=1 make -j4 check_some
      ;;
    esac
 notifications:
@@ -32,11 +32,10 @@
 # 3. cmake ..
 # 4. make -j

-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.5.1)

 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake/modules/")
 include(ReadVersion)
-include(GoogleTest)
 get_rocksdb_version(rocksdb_VERSION)
 project(rocksdb
  VERSION ${rocksdb_VERSION}
@@ -63,7 +62,6 @@ if(CCACHE_FOUND)
 endif(CCACHE_FOUND)

 option(WITH_JEMALLOC "build with JeMalloc" OFF)
-option(WITH_LIBURING "build with liburing" ON)
 option(WITH_SNAPPY "build with SNAPPY" OFF)
 option(WITH_LZ4 "build with lz4" OFF)
 option(WITH_ZLIB "build with zlib" OFF)
@@ -72,12 +70,6 @@ option(WITH_WINDOWS_UTF8_FILENAMES "use UTF8 as characterset for opening files,
 if (WITH_WINDOWS_UTF8_FILENAMES)
  add_definitions(-DROCKSDB_WINDOWS_UTF8_FILENAMES)
 endif()
-
-if ($ENV{CIRCLECI})
-  message(STATUS "Build for CircieCI env, a few tests may be disabled")
-  add_definitions(-DCIRCLECI)
-endif()
-
 # third-party/folly is only validated to work on Linux and Windows for now.
 # So only turn it on there by default.
 if(CMAKE_SYSTEM_NAME MATCHES "Linux|Windows")
@@ -96,9 +88,10 @@ if( NOT DEFINED CMAKE_CXX_STANDARD )
 endif()

 include(CMakeDependentOption)
+CMAKE_DEPENDENT_OPTION(WITH_GFLAGS "build with GFlags" ON
+  "NOT MSVC;NOT MINGW" OFF)

 if(MSVC)
-  option(WITH_GFLAGS "build with GFlags" OFF)
  option(WITH_XPRESS "build with windows built in compression" OFF)
  include(${CMAKE_CURRENT_SOURCE_DIR}/thirdparty.inc)
 else()
@@ -114,11 +107,6 @@ else()
    endif()
  endif()

-  if(MINGW)
-    option(WITH_GFLAGS "build with GFlags" OFF)
-  else()
-    option(WITH_GFLAGS "build with GFlags" ON)
-  endif()
  set(GFLAGS_LIB)
  if(WITH_GFLAGS)
    # Config with namespace available since gflags 2.2.2
@@ -130,11 +118,11 @@ else()
        set(GFLAGS_LIB ${GFLAGS_TARGET})
      else()
        # Config with GFLAGS_LIBRARIES available since gflags 2.1.0
-        set(GFLAGS_LIB ${gflags_LIBRARIES})
+        set(GFLAGS_LIB ${GFLAGS_LIBRARIES})
      endif()
    else()
      find_package(gflags REQUIRED)
-      set(GFLAGS_LIB gflags::gflags)
+        set(GFLAGS_LIB gflags::gflags)
    endif()
    include_directories(${GFLAGS_INCLUDE_DIR})
    list(APPEND THIRDPARTY_LIBS ${GFLAGS_LIB})
@@ -182,25 +170,23 @@ else()
  endif()
 endif()

-string(TIMESTAMP TS "%Y-%m-%d %H:%M:%S" UTC)
-set(BUILD_DATE "${TS}" CACHE STRING "the time we first built rocksdb")
+string(TIMESTAMP TS "%Y/%m/%d %H:%M:%S" UTC)
+set(GIT_DATE_TIME "${TS}" CACHE STRING "the time we first built rocksdb")

 find_package(Git)

 if(GIT_FOUND AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.git")
-  execute_process(WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" OUTPUT_VARIABLE GIT_SHA COMMAND "${GIT_EXECUTABLE}" rev-parse HEAD )
-  execute_process(WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" RESULT_VARIABLE GIT_MOD COMMAND "${GIT_EXECUTABLE}" diff-index HEAD --quiet)
-  execute_process(WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" OUTPUT_VARIABLE GIT_DATE COMMAND "${GIT_EXECUTABLE}" log -1 --date=format:"%Y-%m-%d %T" --format="%ad")
-  execute_process(WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" OUTPUT_VARIABLE GIT_TAG RESULT_VARIABLE rv COMMAND "${GIT_EXECUTABLE}" symbolic-ref -q --short HEAD OUTPUT_STRIP_TRAILING_WHITESPACE)
-  if (rv AND NOT rv EQUAL 0)
-    execute_process(WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" OUTPUT_VARIABLE GIT_TAG COMMAND "${GIT_EXECUTABLE}" describe --tags --exact-match OUTPUT_STRIP_TRAILING_WHITESPACE)
+  if(WIN32)
+    execute_process(COMMAND $ENV{COMSPEC} /C ${GIT_EXECUTABLE} -C ${CMAKE_CURRENT_SOURCE_DIR} rev-parse HEAD OUTPUT_VARIABLE GIT_SHA)
+  else()
+    execute_process(COMMAND ${GIT_EXECUTABLE} -C ${CMAKE_CURRENT_SOURCE_DIR} rev-parse HEAD OUTPUT_VARIABLE GIT_SHA)
  endif()
 else()
  set(GIT_SHA 0)
-  set(GIT_MOD 1)
 endif()
-string(REGEX REPLACE "[^0-9a-fA-F]+" "" GIT_SHA "${GIT_SHA}")
-string(REGEX REPLACE "[^0-9: /-]+" "" GIT_DATE "${GIT_DATE}")
+
+string(REGEX REPLACE "[^0-9a-f]+" "" GIT_SHA "${GIT_SHA}")
+

 option(WITH_MD_LIBRARY "build with MD" ON)
 if(WIN32 AND MSVC)
@@ -213,16 +199,15 @@ endif()

 set(BUILD_VERSION_CC ${CMAKE_BINARY_DIR}/build_version.cc)
 configure_file(util/build_version.cc.in ${BUILD_VERSION_CC} @ONLY)
-
+add_library(build_version OBJECT ${BUILD_VERSION_CC})
+target_include_directories(build_version PRIVATE
+  ${CMAKE_CURRENT_SOURCE_DIR}/util)
 if(MSVC)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi /nologo /EHsc /GS /Gd /GR /GF /fp:precise /Zc:wchar_t /Zc:forScope /errorReport:queue")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /FC /d2Zi+ /W4 /wd4127 /wd4800 /wd4996 /wd4351 /wd4100 /wd4204 /wd4324")
 else()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W -Wextra -Wall -pthread")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W -Wextra -Wall")
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wsign-compare -Wshadow -Wno-unused-parameter -Wno-unused-variable -Woverloaded-virtual -Wnon-virtual-dtor -Wno-missing-field-initializers -Wno-strict-aliasing")
-  if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wstrict-prototypes")
-  endif()
  if(MINGW)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-format -fno-asynchronous-unwind-tables")
    add_definitions(-D_POSIX_C_SOURCE=1)
@@ -258,21 +243,14 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")
  endif(HAS_ALTIVEC)
 endif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")

-if(CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64|AARCH64")
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
        CHECK_C_COMPILER_FLAG("-march=armv8-a+crc+crypto" HAS_ARMV8_CRC)
  if(HAS_ARMV8_CRC)
    message(STATUS " HAS_ARMV8_CRC yes")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=armv8-a+crc+crypto -Wno-unused-function")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=armv8-a+crc+crypto -Wno-unused-function")
  endif(HAS_ARMV8_CRC)
-endif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm64|aarch64|AARCH64")
-
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")
-  CHECK_C_COMPILER_FLAG("-march=native" HAS_S390X_MARCH_NATIVE)
-  if(HAS_S390X_MARCH_NATIVE)
-    message(STATUS " HAS_S390X_MARCH_NATIVE yes")
-  endif(HAS_S390X_MARCH_NATIVE)
-endif(CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")
+endif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")

 option(PORTABLE "build a portable binary" OFF)
 option(FORCE_SSE42 "force building with SSE4.2, even when PORTABLE=ON" OFF)
@@ -299,24 +277,18 @@ if(PORTABLE)
    if(FORCE_AVX2)
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx2 -mbmi -mlzcnt")
    endif()
-    if(CMAKE_SYSTEM_PROCESSOR MATCHES "^s390x")
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=z196")
-    endif()
  endif()
 else()
  if(MSVC)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX2")
  else()
-    if(CMAKE_SYSTEM_PROCESSOR MATCHES "^s390x" AND NOT HAS_S390X_MARCH_NATIVE)
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=z196")
-    elseif(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64" AND NOT HAS_ARMV8_CRC)
+    if(NOT CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64" AND NOT HAS_ARMV8_CRC)
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
    endif()
  endif()
 endif()

 include(CheckCXXSourceCompiles)
-set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
 if(NOT MSVC)
  set(CMAKE_REQUIRED_FLAGS "-msse4.2 -mpclmul")
 endif()
@@ -333,6 +305,7 @@ int main() {
  auto d = _mm_cvtsi128_si64(c);
 }
 " HAVE_SSE42)
+unset(CMAKE_REQUIRED_FLAGS)
 if(HAVE_SSE42)
  add_definitions(-DHAVE_SSE42)
  add_definitions(-DHAVE_PCLMUL)
@@ -340,66 +313,18 @@ elseif(FORCE_SSE42)
  message(FATAL_ERROR "FORCE_SSE42=ON but unable to compile with SSE4.2 enabled")
 endif()

-# Check if -latomic is required or not
-if (NOT MSVC)
-  set(CMAKE_REQUIRED_FLAGS "--std=c++11")
-  CHECK_CXX_SOURCE_COMPILES("
-#include <atomic>
-std::atomic<uint64_t> x(0);
-int main() {
-  uint64_t i = x.load(std::memory_order_relaxed);
-  bool b = x.is_lock_free();
-  return 0;
-}
-" BUILTIN_ATOMIC)
-if (NOT BUILTIN_ATOMIC)
-  #TODO: Check if -latomic exists
-  list(APPEND THIRDPARTY_LIBS atomic)
-endif()
-endif()
-
-if (WITH_LIBURING)
-  set(CMAKE_REQUIRED_FLAGS "-luring")
-  CHECK_CXX_SOURCE_COMPILES("
-#include <liburing.h>
-int main() {
-  struct io_uring ring;
-  io_uring_queue_init(1, &ring, 0);
-  return 0;
-}
-" HAS_LIBURING)
-  if (HAS_LIBURING)
-    add_definitions(-DROCKSDB_IOURING_PRESENT)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -luring")
-  endif()
-endif()
-
-# Reset the required flags
-set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
-
 CHECK_CXX_SOURCE_COMPILES("
 #if defined(_MSC_VER) && !defined(__thread)
 #define __thread __declspec(thread)
 #endif
 int main() {
  static __thread int tls;
-  (void)tls;
 }
 " HAVE_THREAD_LOCAL)
 if(HAVE_THREAD_LOCAL)
  add_definitions(-DROCKSDB_SUPPORT_THREAD_LOCAL)
 endif()

-option(WITH_IOSTATS_CONTEXT "Enable IO stats context" ON)
-if (NOT WITH_IOSTATS_CONTEXT)
-  add_definitions(-DNIOSTATS_CONTEXT)
-endif()
-
-option(WITH_PERF_CONTEXT "Enable perf context" ON)
-if (NOT WITH_PERF_CONTEXT)
-  add_definitions(-DNPERF_CONTEXT)
-endif()
-
 option(FAIL_ON_WARNINGS "Treat compile warnings as errors" ON)
 if(FAIL_ON_WARNINGS)
  if(MSVC)
@@ -541,6 +466,11 @@ if(CMAKE_SYSTEM_NAME MATCHES "Cygwin")
  add_definitions(-fno-builtin-memcmp -DCYGWIN)
 elseif(CMAKE_SYSTEM_NAME MATCHES "Darwin")
  add_definitions(-DOS_MACOSX)
+  if(CMAKE_SYSTEM_PROCESSOR MATCHES arm)
+    add_definitions(-DIOS_CROSS_COMPILE -DROCKSDB_LITE)
+    # no debug info for IOS, that will make our library big
+    add_definitions(-DNDEBUG)
+  endif()
 elseif(CMAKE_SYSTEM_NAME MATCHES "Linux")
  add_definitions(-DOS_LINUX)
 elseif(CMAKE_SYSTEM_NAME MATCHES "SunOS")
@@ -635,27 +565,22 @@ find_package(Threads REQUIRED)

 set(SOURCES
        cache/cache.cc
-        cache/cache_entry_roles.cc
-        cache/cache_reservation_manager.cc
        cache/clock_cache.cc
        cache/lru_cache.cc
        cache/sharded_cache.cc
        db/arena_wrapped_db_iter.cc
-        db/blob/blob_fetcher.cc
        db/blob/blob_file_addition.cc
        db/blob/blob_file_builder.cc
-        db/blob/blob_file_cache.cc
        db/blob/blob_file_garbage.cc
        db/blob/blob_file_meta.cc
        db/blob/blob_file_reader.cc
-        db/blob/blob_garbage_meter.cc
        db/blob/blob_log_format.cc
        db/blob/blob_log_sequential_reader.cc
        db/blob/blob_log_writer.cc
-        db/blob/prefetch_buffer_collection.cc
        db/builder.cc
        db/c.cc
        db/column_family.cc
+        db/compacted_db_impl.cc
        db/compaction/compaction.cc
        db/compaction/compaction_iterator.cc
        db/compaction/compaction_picker.cc
@@ -666,7 +591,6 @@ set(SOURCES
        db/compaction/sst_partitioner.cc
        db/convenience.cc
        db/db_filesnapshot.cc
-        db/db_impl/compacted_db_impl.cc
        db/db_impl/db_impl.cc
        db/db_impl/db_impl_write.cc
        db/db_impl/db_impl_compaction_flush.cc
@@ -717,21 +641,17 @@ set(SOURCES
        db/write_batch_base.cc
        db/write_controller.cc
        db/write_thread.cc
-        env/composite_env.cc
        env/env.cc
        env/env_chroot.cc
        env/env_encryption.cc
        env/env_hdfs.cc
        env/file_system.cc
        env/file_system_tracer.cc
-        env/fs_remap.cc
        env/mock_env.cc
-        env/unique_id_gen.cc
        file/delete_scheduler.cc
        file/file_prefetch_buffer.cc
        file/file_util.cc
        file/filename.cc
-        file/line_file_reader.cc
        file/random_access_file_reader.cc
        file/read_write_util.cc
        file/readahead_raf.cc
@@ -766,7 +686,6 @@ set(SOURCES
        monitoring/thread_status_util_debug.cc
        options/cf_options.cc
        options/configurable.cc
-        options/customizable.cc
        options/db_options.cc
        options/options.cc
        options/options_helper.cc
@@ -820,7 +739,6 @@ set(SOURCES
        table/table_factory.cc
        table/table_properties.cc
        table/two_level_iterator.cc
-        table/unique_id.cc
        test_util/sync_point.cc
        test_util/sync_point_impl.cc
        test_util/testutil.cc
@@ -832,12 +750,9 @@ set(SOURCES
        tools/ldb_tool.cc
        tools/sst_dump_tool.cc
        tools/trace_analyzer_tool.cc
+        trace_replay/trace_replay.cc
        trace_replay/block_cache_tracer.cc
        trace_replay/io_tracer.cc
-        trace_replay/trace_record_handler.cc
-        trace_replay/trace_record_result.cc
-        trace_replay/trace_record.cc
-        trace_replay/trace_replay.cc
        util/coding.cc
        util/compaction_job_stats_impl.cc
        util/comparator.cc
@@ -849,8 +764,6 @@ set(SOURCES
        util/murmurhash.cc
        util/random.cc
        util/rate_limiter.cc
-        util/ribbon_config.cc
-        util/regex.cc
        util/slice.cc
        util/file_checksum_helper.cc
        util/status.cc
@@ -865,23 +778,18 @@ set(SOURCES
        utilities/blob_db/blob_db_impl_filesnapshot.cc
        utilities/blob_db/blob_dump_tool.cc
        utilities/blob_db/blob_file.cc
-        utilities/cache_dump_load.cc
-        utilities/cache_dump_load_impl.cc
        utilities/cassandra/cassandra_compaction_filter.cc
        utilities/cassandra/format.cc
        utilities/cassandra/merge_operator.cc
        utilities/checkpoint/checkpoint_impl.cc
-        utilities/compaction_filters.cc
        utilities/compaction_filters/remove_emptyvalue_compactionfilter.cc
        utilities/debug.cc
        utilities/env_mirror.cc
        utilities/env_timed.cc
        utilities/fault_injection_env.cc
        utilities/fault_injection_fs.cc
-        utilities/fault_injection_secondary_cache.cc
        utilities/leveldb_options/leveldb_options.cc
        utilities/memory/memory_util.cc
-        utilities/merge_operators.cc
        utilities/merge_operators/bytesxor.cc
        utilities/merge_operators/max.cc
        utilities/merge_operators/put.cc
@@ -901,12 +809,8 @@ set(SOURCES
        utilities/simulator_cache/sim_cache.cc
        utilities/table_properties_collectors/compact_on_deletion_collector.cc
        utilities/trace/file_trace_reader_writer.cc
-        utilities/trace/replayer_impl.cc
-        utilities/transactions/lock/lock_manager.cc
-        utilities/transactions/lock/point/point_lock_tracker.cc
-        utilities/transactions/lock/point/point_lock_manager.cc
-        utilities/transactions/lock/range/range_tree/range_tree_lock_manager.cc
-        utilities/transactions/lock/range/range_tree/range_tree_lock_tracker.cc
+        utilities/transactions/lock/lock_tracker.cc
+        utilities/transactions/lock/point_lock_tracker.cc
        utilities/transactions/optimistic_transaction_db_impl.cc
        utilities/transactions/optimistic_transaction.cc
        utilities/transactions/pessimistic_transaction.cc
@@ -914,29 +818,16 @@ set(SOURCES
        utilities/transactions/snapshot_checker.cc
        utilities/transactions/transaction_base.cc
        utilities/transactions/transaction_db_mutex_impl.cc
+        utilities/transactions/transaction_lock_mgr.cc
        utilities/transactions/transaction_util.cc
        utilities/transactions/write_prepared_txn.cc
        utilities/transactions/write_prepared_txn_db.cc
        utilities/transactions/write_unprepared_txn.cc
        utilities/transactions/write_unprepared_txn_db.cc
        utilities/ttl/db_ttl_impl.cc
-        utilities/wal_filter.cc
        utilities/write_batch_with_index/write_batch_with_index.cc
-        utilities/write_batch_with_index/write_batch_with_index_internal.cc)
-
-list(APPEND SOURCES
-  utilities/transactions/lock/range/range_tree/lib/locktree/concurrent_tree.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/keyrange.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/lock_request.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/locktree.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/manager.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/range_buffer.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/treenode.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/txnid_set.cc
-  utilities/transactions/lock/range/range_tree/lib/locktree/wfg.cc
-  utilities/transactions/lock/range/range_tree/lib/standalone_port.cc
-  utilities/transactions/lock/range/range_tree/lib/util/dbt.cc
-  utilities/transactions/lock/range/range_tree/lib/util/memarena.cc)
+        utilities/write_batch_with_index/write_batch_with_index_internal.cc
+        $<TARGET_OBJECTS:build_version>)

 if(HAVE_SSE42 AND NOT MSVC)
  set_source_files_properties(
@@ -961,8 +852,13 @@ if(WIN32)
    port/win/env_win.cc
    port/win/env_default.cc
    port/win/port_win.cc
-    port/win/win_logger.cc
-    port/win/win_thread.cc)
+    port/win/win_logger.cc)
+  if(NOT MINGW)
+    # Mingw only supports std::thread when using
+    # posix threads.
+    list(APPEND SOURCES
+      port/win/win_thread.cc)
+  endif()
 if(WITH_XPRESS)
  list(APPEND SOURCES
    port/win/xpress_win.cc)
@@ -1008,12 +904,12 @@ else()
  set(SYSTEM_LIBS ${CMAKE_THREAD_LIBS_INIT})
 endif()

-add_library(${ROCKSDB_STATIC_LIB} STATIC ${SOURCES} ${BUILD_VERSION_CC})
+add_library(${ROCKSDB_STATIC_LIB} STATIC ${SOURCES})
 target_link_libraries(${ROCKSDB_STATIC_LIB} PRIVATE
  ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})

 if(ROCKSDB_BUILD_SHARED)
-  add_library(${ROCKSDB_SHARED_LIB} SHARED ${SOURCES} ${BUILD_VERSION_CC})
+  add_library(${ROCKSDB_SHARED_LIB} SHARED ${SOURCES})
  target_link_libraries(${ROCKSDB_SHARED_LIB} PRIVATE
    ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})

@@ -1031,7 +927,7 @@ if(ROCKSDB_BUILD_SHARED)
                          LINKER_LANGUAGE CXX
                          VERSION ${rocksdb_VERSION}
                          SOVERSION ${rocksdb_VERSION_MAJOR}
-                          OUTPUT_NAME "rocksdb${ARTIFACT_SUFFIX}")
+                          OUTPUT_NAME "rocksdb")
  endif()
 endif()

@@ -1144,28 +1040,19 @@ if(WITH_TESTS)
  )
  if(WITH_ALL_TESTS)
    list(APPEND TESTS
-        cache/cache_reservation_manager_test.cc
        cache/cache_test.cc
        cache/lru_cache_test.cc
-        db/blob/blob_counting_iterator_test.cc
        db/blob/blob_file_addition_test.cc
        db/blob/blob_file_builder_test.cc
-        db/blob/blob_file_cache_test.cc
        db/blob/blob_file_garbage_test.cc
        db/blob/blob_file_reader_test.cc
-        db/blob/blob_garbage_meter_test.cc
-        db/blob/db_blob_basic_test.cc
-        db/blob/db_blob_compaction_test.cc
-        db/blob/db_blob_corruption_test.cc
        db/blob/db_blob_index_test.cc
        db/column_family_test.cc
        db/compact_files_test.cc
-        db/compaction/clipping_iterator_test.cc
        db/compaction/compaction_job_stats_test.cc
        db/compaction/compaction_job_test.cc
        db/compaction/compaction_iterator_test.cc
        db/compaction/compaction_picker_test.cc
-        db/compaction/compaction_service_test.cc
        db/comparator_db_test.cc
        db/corruption_test.cc
        db/cuckoo_table_db_test.cc
@@ -1181,7 +1068,6 @@ if(WITH_TESTS)
        db/db_iter_test.cc
        db/db_iter_stress_test.cc
        db/db_iterator_test.cc
-        db/db_kv_checksum_test.cc
        db/db_log_iter_test.cc
        db/db_memtable_test.cc
        db/db_merge_operator_test.cc
@@ -1189,7 +1075,7 @@ if(WITH_TESTS)
        db/db_options_test.cc
        db/db_properties_test.cc
        db/db_range_del_test.cc
-        db/db_secondary_test.cc
+        db/db_impl/db_secondary_test.cc
        db/db_sst_test.cc
        db/db_statistics_test.cc
        db/db_table_properties_test.cc
@@ -1253,7 +1139,6 @@ if(WITH_TESTS)
        monitoring/statistics_test.cc
        monitoring/stats_history_test.cc
        options/configurable_test.cc
-        options/customizable_test.cc
        options/options_settable_test.cc
        options/options_test.cc
        table/block_based/block_based_filter_block_test.cc
@@ -1270,7 +1155,6 @@ if(WITH_TESTS)
        table/table_test.cc
        table/block_fetcher_test.cc
        test_util/testutil_test.cc
-        trace_replay/block_cache_tracer_test.cc
        trace_replay/io_tracer_test.cc
        tools/block_cache_analyzer/block_cache_trace_analyzer_test.cc
        tools/io_tracer_parser_test.cc
@@ -1291,7 +1175,6 @@ if(WITH_TESTS)
        util/random_test.cc
        util/rate_limiter_test.cc
        util/repeatable_thread_test.cc
-        util/ribbon_test.cc
        util/slice_test.cc
        util/slice_transform_test.cc
        util/timer_queue_test.cc
@@ -1318,10 +1201,9 @@ if(WITH_TESTS)
        utilities/table_properties_collectors/compact_on_deletion_collector_test.cc
        utilities/transactions/optimistic_transaction_test.cc
        utilities/transactions/transaction_test.cc
-        utilities/transactions/lock/point/point_lock_manager_test.cc
+        utilities/transactions/transaction_lock_mgr_test.cc
        utilities/transactions/write_prepared_transaction_test.cc
        utilities/transactions/write_unprepared_transaction_test.cc
-        utilities/transactions/lock/range/range_locking_test.cc
        utilities/ttl/ttl_test.cc
        utilities/write_batch_with_index/write_batch_with_index_test.cc
    )
@@ -1356,21 +1238,21 @@ if(WITH_TESTS)

  foreach(sourcefile ${TESTS})
      get_filename_component(exename ${sourcefile} NAME_WE)
-      add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile})
-      set_target_properties(${exename}${ARTIFACT_SUFFIX}
+      add_executable(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} ${sourcefile})
+      set_target_properties(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX}
        PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD_RELEASE 1
        EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
        EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
        OUTPUT_NAME ${exename}${ARTIFACT_SUFFIX}
      )
-      target_link_libraries(${exename}${ARTIFACT_SUFFIX} testutillib${ARTIFACT_SUFFIX} testharness gtest ${THIRDPARTY_LIBS} ${ROCKSDB_LIB})
+      target_link_libraries(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} testutillib${ARTIFACT_SUFFIX} testharness gtest ${THIRDPARTY_LIBS} ${ROCKSDB_LIB})
      if(NOT "${exename}" MATCHES "db_sanity_test")
-        gtest_discover_tests(${exename} DISCOVERY_TIMEOUT 120)
-        add_dependencies(check ${exename}${ARTIFACT_SUFFIX})
+        add_test(NAME ${exename} COMMAND ${exename}${ARTIFACT_SUFFIX})
+        add_dependencies(check ${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX})
      endif()
      if("${exename}" MATCHES "env_librados_test")
        # env_librados_test.cc uses librados directly
-        target_link_libraries(${exename}${ARTIFACT_SUFFIX} rados)
+        target_link_libraries(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} rados)
      endif()
  endforeach(sourcefile ${TESTS})

@@ -1395,42 +1277,40 @@ if(WITH_TESTS)
 endif()

 if(WITH_BENCHMARK_TOOLS)
-  add_executable(db_bench${ARTIFACT_SUFFIX}
-    tools/simulated_hybrid_file_system.cc
+  add_executable(db_bench
    tools/db_bench.cc
    tools/db_bench_tool.cc)
-  target_link_libraries(db_bench${ARTIFACT_SUFFIX}
+  target_link_libraries(db_bench
    ${ROCKSDB_LIB} ${THIRDPARTY_LIBS})

-  add_executable(cache_bench${ARTIFACT_SUFFIX}
-    cache/cache_bench.cc
-    cache/cache_bench_tool.cc)
-  target_link_libraries(cache_bench${ARTIFACT_SUFFIX}
+  add_executable(cache_bench
+    cache/cache_bench.cc)
+  target_link_libraries(cache_bench
    ${ROCKSDB_LIB} ${GFLAGS_LIB})

-  add_executable(memtablerep_bench${ARTIFACT_SUFFIX}
+  add_executable(memtablerep_bench
    memtable/memtablerep_bench.cc)
-  target_link_libraries(memtablerep_bench${ARTIFACT_SUFFIX}
+  target_link_libraries(memtablerep_bench
    ${ROCKSDB_LIB} ${GFLAGS_LIB})

-  add_executable(range_del_aggregator_bench${ARTIFACT_SUFFIX}
+  add_executable(range_del_aggregator_bench
    db/range_del_aggregator_bench.cc)
-  target_link_libraries(range_del_aggregator_bench${ARTIFACT_SUFFIX}
+  target_link_libraries(range_del_aggregator_bench
    ${ROCKSDB_LIB} ${GFLAGS_LIB})

-  add_executable(table_reader_bench${ARTIFACT_SUFFIX}
+  add_executable(table_reader_bench
    table/table_reader_bench.cc)
-  target_link_libraries(table_reader_bench${ARTIFACT_SUFFIX}
+  target_link_libraries(table_reader_bench
    ${ROCKSDB_LIB} testharness ${GFLAGS_LIB})

-  add_executable(filter_bench${ARTIFACT_SUFFIX}
+  add_executable(filter_bench
    util/filter_bench.cc)
-  target_link_libraries(filter_bench${ARTIFACT_SUFFIX}
+  target_link_libraries(filter_bench
    ${ROCKSDB_LIB} ${GFLAGS_LIB})

-  add_executable(hash_table_bench${ARTIFACT_SUFFIX}
+  add_executable(hash_table_bench
    utilities/persistent_cache/hash_table_bench.cc)
-  target_link_libraries(hash_table_bench${ARTIFACT_SUFFIX}
+  target_link_libraries(hash_table_bench
    ${ROCKSDB_LIB} ${GFLAGS_LIB})
 endif()

@@ -1450,8 +1330,3 @@ option(WITH_EXAMPLES "build with examples" OFF)
 if(WITH_EXAMPLES)
  add_subdirectory(examples)
 endif()
-
-option(WITH_BENCHMARK "build benchmark tests" OFF)
-if(WITH_BENCHMARK)
-  add_subdirectory(${PROJECT_SOURCE_DIR}/microbench/)
-endif()
@@ -1,428 +1,15 @@
 # Rocksdb Change Log
-## 6.27.3 (2021-12-10)
-### Bug Fixes
-* Fixed a bug in TableOptions.prepopulate_block_cache which causes segmentation fault when used with TableOptions.partition_filters = true and TableOptions.cache_index_and_filter_blocks = true.
-* Fixed a bug affecting custom memtable factories which are not registered with the `ObjectRegistry`. The bug could result in failure to save the OPTIONS file.
-
-## 6.27.2 (2021-12-01)
-### Bug Fixes
-* Fixed a bug in rocksdb automatic implicit prefetching which got broken because of new feature adaptive_readahead and internal prefetching got disabled when iterator moves from one file to next.
-
-## 6.27.1 (2021-11-29)
-### Bug Fixes
-* Fixed a bug that could, with WAL enabled, cause backups, checkpoints, and `GetSortedWalFiles()` to fail randomly with an error like `IO error: 001234.log: No such file or directory`
-
-## 6.27.0 (2021-11-19)
-### New Features
-* Added new ChecksumType kXXH3 which is faster than kCRC32c on almost all x86\_64 hardware.
-* Added a new online consistency check for BlobDB which validates that the number/total size of garbage blobs does not exceed the number/total size of all blobs in any given blob file.
-* Provided support for tracking per-sst user-defined timestamp information in MANIFEST.
-* Added new option "adaptive_readahead" in ReadOptions. For iterators, RocksDB does auto-readahead on noticing sequential reads and by enabling this option, readahead_size of current file (if reads are sequential) will be carried forward to next file instead of starting from the scratch at each level (except L0 level files). If reads are not sequential it will fall back to 8KB. This option is applicable only for RocksDB internal prefetch buffer and isn't supported with underlying file system prefetching.
-* Added the read count and read bytes related stats to Statistics for tiered storage hot, warm, and cold file reads.
-* Added an option to dynamically charge an updating estimated memory usage of block-based table building to block cache if block cache available. It currently only includes charging memory usage of constructing (new) Bloom Filter and Ribbon Filter to block cache. To enable this feature, set `BlockBasedTableOptions::reserve_table_builder_memory = true`.
-* Add a new API OnIOError in listener.h that notifies listeners when an IO error occurs during FileSystem operation along with filename, status etc.
-* Added compaction readahead support for blob files to the integrated BlobDB implementation, which can improve compaction performance when the database resides on higher-latency storage like HDDs or remote filesystems. Readahead can be configured using the column family option `blob_compaction_readahead_size`.
-
-### Bug Fixes
-* Prevent a `CompactRange()` with `CompactRangeOptions::change_level == true` from possibly causing corruption to the LSM state (overlapping files within a level) when run in parallel with another manual compaction. Note that setting `force_consistency_checks == true` (the default) would cause the DB to enter read-only mode in this scenario and return `Status::Corruption`, rather than committing any corruption.
-* Fixed a bug in CompactionIterator when write-prepared transaction is used. A released earliest write conflict snapshot may cause assertion failure in dbg mode and unexpected key in opt mode.
-* Fix ticker WRITE_WITH_WAL("rocksdb.write.wal"), this bug is caused by a bad extra `RecordTick(stats_, WRITE_WITH_WAL)` (at 2 place), this fix remove the extra `RecordTick`s and fix the corresponding test case.
-* EventListener::OnTableFileCreated was previously called with OK status and file_size==0 in cases of no SST file contents written (because there was no content to add) and the empty file deleted before calling the listener. Now the status is Aborted.
-* Fixed a bug in CompactionIterator when write-preared transaction is used. Releasing earliest_snapshot during compaction may cause a SingleDelete to be output after a PUT of the same user key whose seq has been zeroed.
-* Added input sanitization on negative bytes passed into `GenericRateLimiter::Request`.
-* Fixed an assertion failure in CompactionIterator when write-prepared transaction is used. We prove that certain operations can lead to a Delete being followed by a SingleDelete (same user key). We can drop the SingleDelete.
-* Fixed a bug of timestamp-based GC which can cause all versions of a key under full_history_ts_low to be dropped. This bug will be triggered when some of the ikeys' timestamps are lower than full_history_ts_low, while others are newer.
-* In some cases outside of the DB read and compaction paths, SST block checksums are now checked where they were not before.
-* Explicitly check for and disallow the `BlockBasedTableOptions` if insertion into one of {`block_cache`, `block_cache_compressed`, `persistent_cache`} can show up in another of these. (RocksDB expects to be able to use the same key for different physical data among tiers.)
-* Users who configured a dedicated thread pool for bottommost compactions by explicitly adding threads to the `Env::Priority::BOTTOM` pool will no longer see RocksDB schedule automatic compactions exceeding the DB's compaction concurrency limit. For details on per-DB compaction concurrency limit, see API docs of `max_background_compactions` and `max_background_jobs`.
-* Fixed a bug of background flush thread picking more memtables to flush and prematurely advancing column family's log_number.
-* Fixed an assertion failure in ManifestTailer.
-
-### Behavior Changes
-* `NUM_FILES_IN_SINGLE_COMPACTION` was only counting the first input level files, now it's including all input files.
-* `TransactionUtil::CheckKeyForConflicts` can also perform conflict-checking based on user-defined timestamps in addition to sequence numbers.
-* Removed `GenericRateLimiter`'s minimum refill bytes per period previously enforced.
-
-### Public API change
-* When options.ttl is used with leveled compaction with compactinon priority kMinOverlappingRatio, files exceeding half of TTL value will be prioritized more, so that by the time TTL is reached, fewer extra compactions will be scheduled to clear them up. At the same time, when compacting files with data older than half of TTL, output files may be cut off based on those files' boundaries, in order for the early TTL compaction to work properly.
-* Made FileSystem extend the Customizable class and added a CreateFromString method.  Implementations need to be registered with the ObjectRegistry and to implement a Name() method in order to be created via this method.
-* Clarified in API comments that RocksDB is not exception safe for callbacks and custom extensions. An exception propagating into RocksDB can lead to undefined behavior, including data loss, unreported corruption, deadlocks, and more.
-* Marked `WriteBufferManager` as `final` because it is not intended for extension.
-* Removed unimportant implementation details from table_properties.h
-* Add API `FSDirectory::FsyncWithDirOptions()`, which provides extra information like directory fsync reason in `DirFsyncOptions`. File system like btrfs is using that to skip directory fsync for creating a new file, or when renaming a file, fsync the target file instead of the directory, which improves the `DB::Open()` speed by ~20%.
-* `DB::Open()` is not going be blocked by obsolete file purge if `DBOptions::avoid_unnecessary_blocking_io` is set to true.
-* In builds where glibc provides `gettid()`, info log ("LOG" file) lines now print a system-wide thread ID from `gettid()` instead of the process-local `pthread_self()`. For all users, the thread ID format is changed from hexadecimal to decimal integer.
-* In builds where glibc provides `pthread_setname_np()`, the background thread names no longer contain an ID suffix. For example, "rocksdb:bottom7" (and all other threads in the `Env::Priority::BOTTOM` pool) are now named "rocksdb:bottom". Previously large thread pools could breach the name size limit (e.g., naming "rocksdb:bottom10" would fail).
-* Deprecating `ReadOptions::iter_start_seqnum` and `DBOptions::preserve_deletes`, please try using user defined timestamp feature instead. The options will be removed in a future release, currently it logs a warning message when using.
-
-### Performance Improvements
-* Released some memory related to filter construction earlier in `BlockBasedTableBuilder` for `FullFilter` and `PartitionedFilter` case (#9070)
-
-## 6.26.0 (2021-10-20)
-### Bug Fixes
-* Fixes a bug in directed IO mode when calling MultiGet() for blobs in the same blob file. The bug is caused by not sorting the blob read requests by file offsets.
-* Fix the incorrect disabling of SST rate limited deletion when the WAL and DB are in different directories. Only WAL rate limited deletion should be disabled if its in a different directory.
-* Fix `DisableManualCompaction()` to cancel compactions even when they are waiting on automatic compactions to drain due to `CompactRangeOptions::exclusive_manual_compactions == true`.
-* Fix contract of `Env::ReopenWritableFile()` and `FileSystem::ReopenWritableFile()` to specify any existing file must not be deleted or truncated.
-* Fixed bug in calls to `IngestExternalFiles()` with files for multiple column families. The bug could have introduced a delay in ingested file keys becoming visible after `IngestExternalFiles()` returned. Furthermore, mutations to ingested file keys while they were invisible could have been dropped (not necessarily immediately).
-* Fixed a possible race condition impacting users of `WriteBufferManager` who constructed it with `allow_stall == true`. The race condition led to undefined behavior (in our experience, typically a process crash).
-* Fixed a bug where stalled writes would remain stalled forever after the user calls `WriteBufferManager::SetBufferSize()` with `new_size == 0` to dynamically disable memory limiting.
-* Make `DB::close()` thread-safe.
-* Fix a bug in atomic flush where one bg flush thread will wait forever for a preceding bg flush thread to commit its result to MANIFEST but encounters an error which is mapped to a soft error (DB not stopped).
-* Fix a bug in `BackupEngine` where some internal callers of `GenericRateLimiter::Request()` do not honor `bytes <= GetSingleBurstBytes()`.
-
-### New Features
-* Print information about blob files when using "ldb list_live_files_metadata"
-* Provided support for SingleDelete with user defined timestamp.
-* Experimental new function DB::GetLiveFilesStorageInfo offers essentially a unified version of other functions like GetLiveFiles, GetLiveFilesChecksumInfo, and GetSortedWalFiles. Checkpoints and backups could show small behavioral changes and/or improved performance as they now use this new API.
-* Add remote compaction read/write bytes statistics: `REMOTE_COMPACT_READ_BYTES`, `REMOTE_COMPACT_WRITE_BYTES`.
-* Introduce an experimental feature to dump out the blocks from block cache and insert them to the secondary cache to reduce the cache warmup time (e.g., used while migrating DB instance). More information are in `class CacheDumper` and `CacheDumpedLoader` at `rocksdb/utilities/cache_dump_load.h` Note that, this feature is subject to the potential change in the future, it is still experimental.
-* Introduced a new BlobDB configuration option `blob_garbage_collection_force_threshold`, which can be used to trigger compactions targeting the SST files which reference the oldest blob files when the ratio of garbage in those blob files meets or exceeds the specified threshold. This can reduce space amplification with skewed workloads where the affected SST files might not otherwise get picked up for compaction.
-* Added EXPERIMENTAL support for table file (SST) unique identifiers that are stable and universally unique, available with new function `GetUniqueIdFromTableProperties`. Only SST files from RocksDB >= 6.24 support unique IDs.
-* Added `GetMapProperty()` support for "rocksdb.dbstats" (`DB::Properties::kDBStats`). As a map property, it includes DB-level internal stats accumulated over the DB's lifetime, such as user write related stats and uptime.
-
-### Public API change
-* Made SystemClock extend the Customizable class and added a CreateFromString method.  Implementations need to be registered with the ObjectRegistry and to implement a Name() method in order to be created via this method.
-* Made SliceTransform extend the Customizable class and added a CreateFromString method.  Implementations need to be registered with the ObjectRegistry and to implement a Name() method in order to be created via this method.  The Capped and Prefixed transform classes return a short name (no length); use GetId for the fully qualified name.
-* Made FileChecksumGenFactory, SstPartitionerFactory, TablePropertiesCollectorFactory, and WalFilter extend the Customizable class and added a CreateFromString method.
-* Some fields of SstFileMetaData are deprecated for compatibility with new base class FileStorageInfo.
-* Add `file_temperature` to `IngestExternalFileArg` such that when ingesting SST files, we are able to indicate the temperature of the this batch of files.
-* If `DB::Close()` failed with a non aborted status, calling `DB::Close()` again will return the original status instead of Status::OK.
-* Add CacheTier to advanced_options.h to describe the cache tier we used. Add a `lowest_used_cache_tier` option to `DBOptions` (immutable) and pass it to BlockBasedTableReader. By default it is `CacheTier::kNonVolatileBlockTier`, which means, we always use both block cache (kVolatileTier) and secondary cache (kNonVolatileBlockTier). By set it to `CacheTier::kVolatileTier`, the DB will not use the secondary cache.
-* Even when options.max_compaction_bytes is hit, compaction output files are only cut when it aligns with grandparent files' boundaries. options.max_compaction_bytes could be slightly violated with the change, but the violation is no more than one target SST file size, which is usually much smaller.
-
-### Performance Improvements
-* Improved CPU efficiency of building block-based table (SST) files (#9039 and #9040).
-
-### Java API Changes
-* Add Java API bindings for new integrated BlobDB options
-* `keyMayExist()` supports ByteBuffer.
-* Fix multiget throwing Null Pointer Exception for num of keys > 70k (https://github.com/facebook/rocksdb/issues/8039).
-
-## 6.25.0 (2021-09-20)
-### Bug Fixes
-* Allow secondary instance to refresh iterator. Assign read seq after referencing SuperVersion.
-* Fixed a bug of secondary instance's last_sequence going backward, and reads on the secondary fail to see recent updates from the primary.
-* Fixed a bug that could lead to duplicate DB ID or DB session ID in POSIX environments without /proc/sys/kernel/random/uuid.
-* Fix a race in DumpStats() with column family destruction due to not taking a Ref on each entry while iterating the ColumnFamilySet.
-* Fix a race in item ref counting in LRUCache when promoting an item from the SecondaryCache.
-* Fix a race in BackupEngine if RateLimiter is reconfigured during concurrent Restore operations.
-* Fix a bug on POSIX in which failure to create a lock file (e.g. out of space) can prevent future LockFile attempts in the same process on the same file from succeeding.
-* Fix a bug that backup_rate_limiter and restore_rate_limiter in BackupEngine could not limit read rates.
-* Fix the implementation of `prepopulate_block_cache = kFlushOnly` to only apply to flushes rather than to all generated files.
-* Fix WAL log data corruption when using DBOptions.manual_wal_flush(true) and WriteOptions.sync(true) together. The sync WAL should work with locked log_write_mutex_.
-* Add checks for validity of the IO uring completion queue entries, and fail the BlockBasedTableReader MultiGet sub-batch if there's an invalid completion
-* Add an interface RocksDbIOUringEnable() that, if defined by the user, will allow them to enable/disable the use of IO uring by RocksDB
-* Fix the bug that when direct I/O is used and MultiRead() returns a short result, RandomAccessFileReader::MultiRead() still returns full size buffer, with returned short value together with some data in original buffer. This bug is unlikely cause incorrect results, because (1) since FileSystem layer is expected to retry on short result, returning short results is only possible when asking more bytes in the end of the file, which RocksDB doesn't do when using MultiRead(); (2) checksum is unlikely to match.
-
-### New Features
-* RemoteCompaction's interface now includes `db_name`, `db_id`, `session_id`, which could help the user uniquely identify compaction job between db instances and sessions.
-* Added a ticker statistic, "rocksdb.verify_checksum.read.bytes", reporting how many bytes were read from file to serve `VerifyChecksum()` and `VerifyFileChecksums()` queries.
-* Added ticker statistics, "rocksdb.backup.read.bytes" and "rocksdb.backup.write.bytes", reporting how many bytes were read and written during backup.
-* Added properties for BlobDB: `rocksdb.num-blob-files`, `rocksdb.blob-stats`, `rocksdb.total-blob-file-size`, and `rocksdb.live-blob-file-size`. The existing property `rocksdb.estimate_live-data-size` was also extended to include live bytes residing in blob files.
-* Added two new RateLimiter IOPriorities: `Env::IO_USER`,`Env::IO_MID`. `Env::IO_USER` will have superior priority over all other RateLimiter IOPriorities without being subject to fair scheduling constraint.
-* `SstFileWriter` now supports `Put`s and `Delete`s with user-defined timestamps. Note that the ingestion logic itself is not timestamp-aware yet.
-* Allow a single write batch to include keys from multiple column families whose timestamps' formats can differ. For example, some column families may disable timestamp, while others enable timestamp.
-* Add compaction priority information in RemoteCompaction, which can be used to schedule high priority job first.
-* Added new callback APIs `OnBlobFileCreationStarted`,`OnBlobFileCreated`and `OnBlobFileDeleted` in `EventListener` class of listener.h. It notifies listeners during creation/deletion of individual blob files in Integrated BlobDB. It also log blob file creation finished event and deletion event in LOG file.
-* Batch blob read requests for `DB::MultiGet` using `MultiRead`.
-* Add support for fallback to local compaction, the user can return `CompactionServiceJobStatus::kUseLocal` to instruct RocksDB to run the compaction locally instead of waiting for the remote compaction result.
-* Add built-in rate limiter's implementation of `RateLimiter::GetTotalPendingRequest(int64_t* total_pending_requests, const Env::IOPriority pri)` for the total number of requests that are pending for bytes in the rate limiter.
-* Charge memory usage during data buffering, from which training samples are gathered for dictionary compression, to block cache. Unbuffering data can now be triggered if the block cache becomes full and `strict_capacity_limit=true` for the block cache, in addition to existing conditions that can trigger unbuffering.
-
-### Public API change
-* Remove obsolete implementation details FullKey and ParseFullKey from public API
-* Change `SstFileMetaData::size` from `size_t` to `uint64_t`.
-* Made Statistics extend the Customizable class and added a CreateFromString method.  Implementations of Statistics need to be registered with the ObjectRegistry and to implement a Name() method in order to be created via this method.
-* Extended `FlushJobInfo` and `CompactionJobInfo` in listener.h to provide information about the blob files generated by a flush/compaction and garbage collected during compaction in Integrated BlobDB. Added struct members `blob_file_addition_infos` and `blob_file_garbage_infos` that contain this information.
-* Extended parameter `output_file_names` of `CompactFiles` API to also include paths of the blob files generated by the compaction in Integrated BlobDB.
-* Most `BackupEngine` functions now return `IOStatus` instead of `Status`. Most existing code should be compatible with this change but some calls might need to be updated.
-* Add a new field `level_at_creation` in `TablePropertiesCollectorFactory::Context` to capture the level at creating the SST file (i.e, table), of which the properties are being collected.
-
-### Miscellaneous
-* Add a paranoid check where in case FileSystem layer doesn't fill the buffer but returns succeed, checksum is unlikely to match even if buffer contains a previous block. The byte modified is not useful anyway, so it isn't expected to change any behavior when FileSystem is satisfying its contract.
-
-## 6.24.0 (2021-08-20)
-### Bug Fixes
-* If the primary's CURRENT file is missing or inaccessible, the secondary instance should not hang repeatedly trying to switch to a new MANIFEST. It should instead return the error code encountered while accessing the file.
-* Restoring backups with BackupEngine is now a logically atomic operation, so that if a restore operation is interrupted, DB::Open on it will fail. Using BackupEngineOptions::sync (default) ensures atomicity even in case of power loss or OS crash.
-* Fixed a race related to the destruction of `ColumnFamilyData` objects. The earlier logic unlocked the DB mutex before destroying the thread-local `SuperVersion` pointers, which could result in a process crash if another thread managed to get a reference to the `ColumnFamilyData` object.
-* Removed a call to `RenameFile()` on a non-existent info log file ("LOG") when opening a new DB. Such a call was guaranteed to fail though did not impact applications since we swallowed the error. Now we also stopped swallowing errors in renaming "LOG" file.
-* Fixed an issue where `OnFlushCompleted` was not called for atomic flush.
-* Fixed a bug affecting the batched `MultiGet` API when used with keys spanning multiple column families and `sorted_input == false`.
-* Fixed a potential incorrect result in opt mode and assertion failures caused by releasing snapshot(s) during compaction.
-* Fixed passing of BlobFileCompletionCallback to Compaction job and Atomic flush job which was default paramter (nullptr). BlobFileCompletitionCallback is internal callback that manages addition of blob files to SSTFileManager.
-* Fixed MultiGet not updating the block_read_count and block_read_byte PerfContext counters.
-
-### New Features
-* Made the EventListener extend the Customizable class.
-* EventListeners that have a non-empty Name() and that are registered with the ObjectRegistry can now be serialized to/from the OPTIONS file.
-* Insert warm blocks (data blocks, uncompressed dict blocks, index and filter blocks) in Block cache during flush under option BlockBasedTableOptions.prepopulate_block_cache. Previously it was enabled for only data blocks.
-* BlockBasedTableOptions.prepopulate_block_cache can be dynamically configured using DB::SetOptions.
-* Add CompactionOptionsFIFO.age_for_warm, which allows RocksDB to move old files to warm tier in FIFO compactions. Note that file temperature is still an experimental feature.
-* Add a comment to suggest btrfs user to disable file preallocation by setting `options.allow_fallocate=false`.
-* Fast forward option in Trace replay changed to double type to allow replaying at a lower speed, by settings the value between 0 and 1. This option can be set via `ReplayOptions` in `Replayer::Replay()`, or via `--trace_replay_fast_forward` in db_bench.
-* Add property `LiveSstFilesSizeAtTemperature` to retrieve sst file size at different temperature.
-* Added a stat rocksdb.secondary.cache.hits.
-* Added a PerfContext counter secondary_cache_hit_count.
-* The integrated BlobDB implementation now supports the tickers `BLOB_DB_BLOB_FILE_BYTES_READ`, `BLOB_DB_GC_NUM_KEYS_RELOCATED`, and `BLOB_DB_GC_BYTES_RELOCATED`, as well as the histograms `BLOB_DB_COMPRESSION_MICROS` and `BLOB_DB_DECOMPRESSION_MICROS`.
-* Added hybrid configuration of Ribbon filter and Bloom filter where some LSM levels use Ribbon for memory space efficiency and some use Bloom for speed. See NewRibbonFilterPolicy. This also changes the default behavior of NewRibbonFilterPolicy to use Bloom for flushes under Leveled and Universal compaction and Ribbon otherwise. The C API function `rocksdb_filterpolicy_create_ribbon` is unchanged but adds new `rocksdb_filterpolicy_create_ribbon_hybrid`.
-
-### Public API change
-* Added APIs to decode and replay trace file via Replayer class. Added `DB::NewDefaultReplayer()` to create a default Replayer instance. Added `TraceReader::Reset()` to restart reading a trace file. Created trace_record.h, trace_record_result.h and utilities/replayer.h files to access the decoded Trace records, replay them, and query the actual operation results.
-* Added Configurable::GetOptionsMap to the public API for use in creating new Customizable classes.
-* Generalized bits_per_key parameters in C API from int to double for greater configurability. Although this is a compatible change for existing C source code, anything depending on C API signatures, such as foreign function interfaces, will need to be updated.
-
-### Performance Improvements
-* Try to avoid updating DBOptions if `SetDBOptions()` does not change any option value.
-
-### Behavior Changes
-* `StringAppendOperator` additionally accepts a string as the delimiter.
-* BackupEngineOptions::sync (default true) now applies to restoring backups in addition to creating backups. This could slow down restores, but ensures they are fully persisted before returning OK. (Consider increasing max_background_operations to improve performance.)
-
-## 6.23.0 (2021-07-16)
-### Behavior Changes
-* Obsolete keys in the bottommost level that were preserved for a snapshot will now be cleaned upon snapshot release in all cases. This form of compaction (snapshot release triggered compaction) previously had an artificial limitation that multiple tombstones needed to be present.
-### Bug Fixes
-* Blob file checksums are now printed in hexadecimal format when using the `manifest_dump` `ldb` command.
-* `GetLiveFilesMetaData()` now populates the `temperature`, `oldest_ancester_time`, and `file_creation_time` fields of its `LiveFileMetaData` results when the information is available. Previously these fields always contained zero indicating unknown.
-* Fix mismatches of OnCompaction{Begin,Completed} in case of DisableManualCompaction().
-* Fix continuous logging of an existing background error on every user write
-* Fix a bug that `Get()` return Status::OK() and an empty value for non-existent key when `read_options.read_tier = kBlockCacheTier`.
-* Fix a bug that stat in `get_context` didn't accumulate to statistics when query is failed.
-* Fixed handling of DBOptions::wal_dir with LoadLatestOptions() or ldb --try_load_options on a copied or moved DB. Previously, when the WAL directory is same as DB directory (default), a copied or moved DB would reference the old path of the DB as the WAL directory, potentially corrupting both copies. Under this change, the wal_dir from DB::GetOptions() or LoadLatestOptions() may now be empty, indicating that the current DB directory is used for WALs. This is also a subtle API change.
-
-### New Features
-* ldb has a new feature, `list_live_files_metadata`, that shows the live SST files, as well as their LSM storage level and the column family they belong to.
-* The new BlobDB implementation now tracks the amount of garbage in each blob file in the MANIFEST.
-* Integrated BlobDB now supports Merge with base values (Put/Delete etc.).
-* RemoteCompaction supports sub-compaction, the job_id in the user interface is changed from `int` to `uint64_t` to support sub-compaction id.
-* Expose statistics option in RemoteCompaction worker.
-
-### Public API change
-* Added APIs to the Customizable class to allow developers to create their own Customizable classes.  Created the utilities/customizable_util.h file to contain helper methods for developing new Customizable classes.
-* Change signature of SecondaryCache::Name().  Make SecondaryCache customizable and add SecondaryCache::CreateFromString method.
-
-## 6.22.0 (2021-06-18)
-### Behavior Changes
-* Added two additional tickers, MEMTABLE_PAYLOAD_BYTES_AT_FLUSH and MEMTABLE_GARBAGE_BYTES_AT_FLUSH. These stats can be used to estimate the ratio of "garbage" (outdated) bytes in the memtable that are discarded at flush time.
-* Added API comments clarifying safe usage of Disable/EnableManualCompaction and EventListener callbacks for compaction.
-### Bug Fixes
-* fs_posix.cc GetFreeSpace() always report disk space available to root even when running as non-root.  Linux defaults often have disk mounts with 5 to 10 percent of total space reserved only for root.  Out of space could result for non-root users.
-* Subcompactions are now disabled when user-defined timestamps are used, since the subcompaction boundary picking logic is currently not timestamp-aware, which could lead to incorrect results when different subcompactions process keys that only differ by timestamp.
-* Fix an issue that `DeleteFilesInRange()` may cause ongoing compaction reports corruption exception, or ASSERT for debug build. There's no actual data loss or corruption that we find.
-* Fixed confusingly duplicated output in LOG for periodic stats ("DUMPING STATS"), including "Compaction Stats" and "File Read Latency Histogram By Level".
-* Fixed performance bugs in background gathering of block cache entry statistics, that could consume a lot of CPU when there are many column families with a shared block cache.
-
-### New Features
-* Marked the Ribbon filter and optimize_filters_for_memory features as production-ready, each enabling memory savings for Bloom-like filters. Use `NewRibbonFilterPolicy` in place of `NewBloomFilterPolicy` to use Ribbon filters instead of Bloom, or `ribbonfilter` in place of `bloomfilter` in configuration string.
-* Allow `DBWithTTL` to use `DeleteRange` api just like other DBs. `DeleteRangeCF()` which executes `WriteBatchInternal::DeleteRange()` has been added to the handler in `DBWithTTLImpl::Write()` to implement it.
-* Add BlockBasedTableOptions.prepopulate_block_cache.  If enabled, it prepopulate warm/hot data blocks which are already in memory into block cache at the time of flush. On a flush, the data block that is in memory (in memtables) get flushed to the device. If using Direct IO, additional IO is incurred to read this data back into memory again, which is avoided by enabling this option and it also helps with Distributed FileSystem. More details in include/rocksdb/table.h.
-* Added a `cancel` field to `CompactRangeOptions`, allowing individual in-process manual range compactions to be cancelled.
-
-### New Features
-* Added BlobMetaData to the ColumnFamilyMetaData to return information about blob files
-
-### Public API change
-* Added GetAllColumnFamilyMetaData API to retrieve the ColumnFamilyMetaData about all column families.
-
-## 6.21.0 (2021-05-21)
-### Bug Fixes
-* Fixed a bug in handling file rename error in distributed/network file systems when the server succeeds but client returns error. The bug can cause CURRENT file to point to non-existing MANIFEST file, thus DB cannot be opened.
-* Fixed a bug where ingested files were written with incorrect boundary key metadata. In rare cases this could have led to a level's files being wrongly ordered and queries for the boundary keys returning wrong results.
-* Fixed a data race between insertion into memtables and the retrieval of the DB properties `rocksdb.cur-size-active-mem-table`, `rocksdb.cur-size-all-mem-tables`, and `rocksdb.size-all-mem-tables`.
-* Fixed the false-positive alert when recovering from the WAL file. Avoid reporting "SST file is ahead of WAL" on a newly created empty column family, if the previous WAL file is corrupted.
-* Fixed a bug where `GetLiveFiles()` output included a non-existent file called "OPTIONS-000000". Backups and checkpoints, which use `GetLiveFiles()`, failed on DBs impacted by this bug. Read-write DBs were impacted when the latest OPTIONS file failed to write and `fail_if_options_file_error == false`. Read-only DBs were impacted when no OPTIONS files existed.
-* Handle return code by io_uring_submit_and_wait() and io_uring_wait_cqe().
-* In the IngestExternalFile() API, only try to sync the ingested file if the file is linked and the FileSystem/Env supports reopening a writable file.
-* Fixed a bug that `AdvancedColumnFamilyOptions.max_compaction_bytes` is under-calculated for manual compaction (`CompactRange()`). Manual compaction is split to multiple compactions if the compaction size exceed the `max_compaction_bytes`. The bug creates much larger compaction which size exceed the user setting. On the other hand, larger manual compaction size can increase the subcompaction parallelism, you can tune that by setting `max_compaction_bytes`.
-
-### Behavior Changes
-* Due to the fix of false-postive alert of "SST file is ahead of WAL", all the CFs with no SST file (CF empty) will bypass the consistency check. We fixed a false-positive, but introduced a very rare true-negative which will be triggered in the following conditions: A CF with some delete operations in the last a few queries which will result in an empty CF (those are flushed to SST file and a compaction triggered which combines this file and all other SST files and generates an empty CF, or there is another reason to write a manifest entry for this CF after a flush that generates no SST file from an empty CF). The deletion entries are logged in a WAL and this WAL was corrupted, while the CF's log number points to the next WAL (due to the flush). Therefore, the DB can only recover to the point without these trailing deletions and cause the inconsistent DB status.
-
-### New Features
-* Add new option allow_stall passed during instance creation of WriteBufferManager. When allow_stall is set, WriteBufferManager will stall all writers shared across multiple DBs and columns if memory usage goes beyond specified WriteBufferManager::buffer_size (soft limit). Stall will be cleared when memory is freed after flush and memory usage goes down below buffer_size.
-* Allow `CompactionFilter`s to apply in more table file creation scenarios such as flush and recovery. For compatibility, `CompactionFilter`s by default apply during compaction. Users can customize this behavior by overriding `CompactionFilterFactory::ShouldFilterTableFileCreation()`.
-* Added more fields to FilterBuildingContext with LSM details, for custom filter policies that vary behavior based on where they are in the LSM-tree.
-* Added DB::Properties::kBlockCacheEntryStats for querying statistics on what percentage of block cache is used by various kinds of blocks, etc. using DB::GetProperty and DB::GetMapProperty. The same information is now dumped to info LOG periodically according to `stats_dump_period_sec`.
-* Add an experimental Remote Compaction feature, which allows the user to run Compaction on a different host or process. The feature is still under development, currently only works on some basic use cases. The interface will be changed without backward/forward compatibility support.
-* RocksDB would validate total entries read in flush, and compare with counter inserted into it. If flush_verify_memtable_count = true (default), flush will fail. Otherwise, only log to info logs.
-* Add `TableProperties::num_filter_entries`, which can be used with `TableProperties::filter_size` to calculate the effective bits per filter entry (unique user key or prefix) for a table file.
-
-### Performance Improvements
-* BlockPrefetcher is used by iterators to prefetch data if they anticipate more data to be used in future. It is enabled implicitly by rocksdb. Added change to take in account read pattern if reads are sequential. This would disable prefetching for random reads in MultiGet and iterators as readahead_size is increased exponential doing large prefetches.
-
-### Public API change
-* Removed a parameter from TableFactory::NewTableBuilder, which should not be called by user code because TableBuilder is not a public API.
-* Removed unused structure `CompactionFilterContext`.
-* The `skip_filters` parameter to SstFileWriter is now considered deprecated. Use `BlockBasedTableOptions::filter_policy` to control generation of filters.
-* ClockCache is known to have bugs that could lead to crash or corruption, so should not be used until fixed. Use NewLRUCache instead.
-* Added a new pure virtual function `ApplyToAllEntries` to `Cache`, to replace `ApplyToAllCacheEntries`. Custom `Cache` implementations must add an implementation. Because this function is for gathering statistics, an empty implementation could be acceptable for some applications.
-* Added the ObjectRegistry to the ConfigOptions class.  This registry instance will be used to find any customizable loadable objects during initialization.
-* Expanded the ObjectRegistry functionality to allow nested ObjectRegistry instances.  Added methods to register a set of functions with the registry/library as a group.
-* Deprecated backupable_db.h and BackupableDBOptions in favor of new versions with appropriate names: backup_engine.h and BackupEngineOptions. Old API compatibility is preserved.
-
-### Default Option Change
-* When options.arena_block_size <= 0 (default value 0), still use writer_buffer_size / 8 but cap to 1MB. Too large alloation size might not be friendly to allocator and might cause performance issues in extreme cases.
-
-### Build
-* By default, try to build with liburing. For make, if ROCKSDB_USE_IO_URING is not set, treat as enable, which means RocksDB will try to build with liburing. Users can disable it with ROCKSDB_USE_IO_URING=0. For cmake, add WITH_LIBURING to control it, with default on.
-
-## 6.20.0 (2021-04-16)
-### Behavior Changes
-* `ColumnFamilyOptions::sample_for_compression` now takes effect for creation of all block-based tables. Previously it only took effect for block-based tables created by flush.
-* `CompactFiles()` can no longer compact files from lower level to up level, which has the risk to corrupt DB (details: #8063). The validation is also added to all compactions.
-* Fixed some cases in which DB::OpenForReadOnly() could write to the filesystem. If you want a Logger with a read-only DB, you must now set DBOptions::info_log yourself, such as using CreateLoggerFromOptions().
-* get_iostats_context() will never return nullptr. If thread-local support is not available, and user does not opt-out iostats context, then compilation will fail. The same applies to perf context as well.
-* Added support for WriteBatchWithIndex::NewIteratorWithBase when overwrite_key=false.  Previously, this combination was not supported and would assert or return nullptr.
-* Improve the behavior of WriteBatchWithIndex for Merge operations.  Now more operations may be stored in order to return the correct merged result.
-
-### Bug Fixes
-* Use thread-safe `strerror_r()` to get error messages.
-* Fixed a potential hang in shutdown for a DB whose `Env` has high-pri thread pool disabled (`Env::GetBackgroundThreads(Env::Priority::HIGH) == 0`)
-* Made BackupEngine thread-safe and added documentation comments to clarify what is safe for multiple BackupEngine objects accessing the same backup directory.
-* Fixed crash (divide by zero) when compression dictionary is applied to a file containing only range tombstones.
-* Fixed a backward iteration bug with partitioned filter enabled: not including the prefix of the last key of the previous filter partition in current filter partition can cause wrong iteration result.
-* Fixed a bug that allowed `DBOptions::max_open_files` to be set with a non-negative integer with `ColumnFamilyOptions::compaction_style = kCompactionStyleFIFO`.
-
-### Performance Improvements
-* On ARM platform, use `yield` instead of `wfe` to relax cpu to gain better performance.
-
-### Public API change
-* Added `TableProperties::slow_compression_estimated_data_size` and `TableProperties::fast_compression_estimated_data_size`. When `ColumnFamilyOptions::sample_for_compression > 0`, they estimate what `TableProperties::data_size` would have been if the "fast" or "slow" (see `ColumnFamilyOptions::sample_for_compression` API doc for definitions) compression had been used instead.
-* Update DB::StartIOTrace and remove Env object from the arguments as its redundant and DB already has Env object that is passed down to IOTracer::StartIOTrace
-* Added `FlushReason::kWalFull`, which is reported when a memtable is flushed due to the WAL reaching its size limit; those flushes were previously reported as `FlushReason::kWriteBufferManager`. Also, changed the reason for flushes triggered by the write buffer manager to `FlushReason::kWriteBufferManager`; they were previously reported as `FlushReason::kWriteBufferFull`.
-* Extend file_checksum_dump ldb command and DB::GetLiveFilesChecksumInfo API for IntegratedBlobDB and get checksum of blob files along with SST files.
-
-### New Features
-* Added the ability to open BackupEngine backups as read-only DBs, using BackupInfo::name_for_open and env_for_open provided by BackupEngine::GetBackupInfo() with include_file_details=true.
-* Added BackupEngine support for integrated BlobDB, with blob files shared between backups when table files are shared. Because of current limitations, blob files always use the kLegacyCrc32cAndFileSize naming scheme, and incremental backups must read and checksum all blob files in a DB, even for files that are already backed up.
-* Added an optional output parameter to BackupEngine::CreateNewBackup(WithMetadata) to return the BackupID of the new backup.
-* Added BackupEngine::GetBackupInfo / GetLatestBackupInfo for querying individual backups.
-* Made the Ribbon filter a long-term supported feature in terms of the SST schema(compatible with version >= 6.15.0) though the API for enabling it is expected to change.
-
-## 6.19.0 (2021-03-21)
-### Bug Fixes
-* Fixed the truncation error found in APIs/tools when dumping block-based SST files in a human-readable format. After fix, the block-based table can be fully dumped as a readable file.
-* When hitting a write slowdown condition, no write delay (previously 1 millisecond) is imposed until `delayed_write_rate` is actually exceeded, with an initial burst allowance of 1 millisecond worth of bytes. Also, beyond the initial burst allowance, `delayed_write_rate` is now more strictly enforced, especially with multiple column families.
-
-### Public API change
-* Changed default `BackupableDBOptions::share_files_with_checksum` to `true` and deprecated `false` because of potential for data loss. Note that accepting this change in behavior can temporarily increase backup data usage because files are not shared between backups using the two different settings. Also removed obsolete option kFlagMatchInterimNaming.
-* Add a new option BlockBasedTableOptions::max_auto_readahead_size. RocksDB does auto-readahead for iterators on noticing more than two reads for a table file if user doesn't provide readahead_size. The readahead starts at 8KB and doubles on every additional read upto max_auto_readahead_size and now max_auto_readahead_size can be configured dynamically as well. Found that 256 KB readahead size provides the best performance, based on experiments, for auto readahead. Experiment data is in PR #3282. If value is set 0 then no automatic prefetching will be done by rocksdb. Also changing the value will only affect files opened after the change.
-* Add suppport to extend DB::VerifyFileChecksums API to also verify blob files checksum.
-* When using the new BlobDB, the amount of data written by flushes/compactions is now broken down into table files and blob files in the compaction statistics; namely, Write(GB) denotes the amount of data written to table files, while Wblob(GB) means the amount of data written to blob files.
-* New default BlockBasedTableOptions::format_version=5 to enable new Bloom filter implementation by default, compatible with RocksDB versions >= 6.6.0.
-* Add new SetBufferSize API to WriteBufferManager to allow dynamic management of memory allotted to all write buffers.  This allows user code to adjust memory monitoring provided by WriteBufferManager as process memory needs change datasets grow and shrink.
-* Clarified the required semantics of Read() functions in FileSystem and Env APIs. Please ensure any custom implementations are compliant.
-* For the new integrated BlobDB implementation, compaction statistics now include the amount of data read from blob files during compaction (due to garbage collection or compaction filters). Write amplification metrics have also been extended to account for data read from blob files.
-* Add EqualWithoutTimestamp() to Comparator.
-* Extend support to track blob files in SSTFileManager whenever a blob file is created/deleted. Blob files will be scheduled to delete via SSTFileManager and SStFileManager will now take blob files in account while calculating size and space limits along with SST files.
-* Add new Append and PositionedAppend API with checksum handoff to legacy Env.
-
-### New Features
-* Support compaction filters for the new implementation of BlobDB. Add `FilterBlobByKey()` to `CompactionFilter`. Subclasses can override this method so that compaction filters can determine whether the actual blob value has to be read during compaction. Use a new `kUndetermined` in `CompactionFilter::Decision` to indicated that further action is necessary for compaction filter to make a decision.
-* Add support to extend retrieval of checksums for blob files from the MANIFEST when checkpointing. During backup, rocksdb can detect corruption in blob files  during file copies.
-* Add new options for db_bench --benchmarks: flush, waitforcompaction, compact0, compact1.
-* Add an option to BackupEngine::GetBackupInfo to include the name and size of each backed-up file. Especially in the presence of file sharing among backups, this offers detailed insight into backup space usage.
-* Enable backward iteration on keys with user-defined timestamps.
-* Add statistics and info log for error handler: counters for bg error, bg io error, bg retryable io error, auto resume count, auto resume total retry number, and auto resume sucess; Histogram for auto resume retry count in each recovery call. Note that, each auto resume attempt will have one or multiple retries.
-
-### Behavior Changes
-* During flush, only WAL sync retryable IO error is mapped to hard error, which will stall the writes. When WAL is used but only SST file write has retryable IO error, it will be mapped to soft error and write will not be affected.
-
-## 6.18.0 (2021-02-19)
-### Behavior Changes
-* When retryable IO error occurs during compaction, it is mapped to soft error and set the BG error. However, auto resume is not called to clean the soft error since compaction will reschedule by itself. In this change, When retryable IO error occurs during compaction, BG error is not set. User will be informed the error via EventHelper.
-* Introduce a new trace file format for query tracing and replay and trace file version is bump up to 0.2. A payload map is added as the first portion of the payload. We will not have backward compatible issues when adding new entries to trace records. Added the iterator_upper_bound and iterator_lower_bound in Seek and SeekForPrev tracing function. Added them as the new payload member for iterator tracing.
-
-### New Features
-* Add support for key-value integrity protection in live updates from the user buffers provided to `WriteBatch` through the write to RocksDB's in-memory update buffer (memtable). This is intended to detect some cases of in-memory data corruption, due to either software or hardware errors. Users can enable protection by constructing their `WriteBatch` with `protection_bytes_per_key == 8`.
-* Add support for updating `full_history_ts_low` option in manual compaction, which is for old timestamp data GC.
-* Add a mechanism for using Makefile to build external plugin code into the RocksDB libraries/binaries. This intends to simplify compatibility and distribution for plugins (e.g., special-purpose `FileSystem`s) whose source code resides outside the RocksDB repo. See "plugin/README.md" for developer details, and "PLUGINS.md" for a listing of available plugins.
-* Added memory pre-fetching for experimental Ribbon filter, which especially optimizes performance with batched MultiGet.
-* A new, experimental version of BlobDB (key-value separation) is now available. The new implementation is integrated into the RocksDB core, i.e. it is accessible via the usual `rocksdb::DB` API, as opposed to the separate `rocksdb::blob_db::BlobDB` interface used by the earlier version, and can be configured on a per-column family basis using the configuration options `enable_blob_files`, `min_blob_size`, `blob_file_size`, `blob_compression_type`, `enable_blob_garbage_collection`, and `blob_garbage_collection_age_cutoff`. It extends RocksDB's consistency guarantees to blobs, and offers more features and better performance. Note that some features, most notably `Merge`, compaction filters, and backup/restore are not yet supported, and there is no support for migrating a database created by the old implementation.
-
-### Bug Fixes
-* Since 6.15.0, `TransactionDB` returns error `Status`es from calls to `DeleteRange()` and calls to `Write()` where the `WriteBatch` contains a range deletion. Previously such operations may have succeeded while not providing the expected transactional guarantees. There are certain cases where range deletion can still be used on such DBs; see the API doc on `TransactionDB::DeleteRange()` for details.
-* `OptimisticTransactionDB` now returns error `Status`es from calls to `DeleteRange()` and calls to `Write()` where the `WriteBatch` contains a range deletion. Previously such operations may have succeeded while not providing the expected transactional guarantees.
-* Fix `WRITE_PREPARED`, `WRITE_UNPREPARED` TransactionDB `MultiGet()` may return uncommitted data with snapshot.
-* In DB::OpenForReadOnly, if any error happens while checking Manifest file path, it was overridden by Status::NotFound. It has been fixed and now actual error is returned.
-
-### Public API Change
-* Added a "only_mutable_options" flag to the ConfigOptions.  When this flag is "true", the Configurable functions and convenience methods (such as GetDBOptionsFromString) will only deal with options that are marked as mutable.  When this flag is true, only options marked as mutable can be configured (a Status::InvalidArgument will be returned) and options not marked as mutable will not be returned or compared.  The default is "false", meaning to compare all options.
-* Add new Append and PositionedAppend APIs to FileSystem to bring the data verification information (data checksum information) from upper layer (e.g., WritableFileWriter) to the storage layer. In this way, the customized FileSystem is able to verify the correctness of data being written to the storage on time. Add checksum_handoff_file_types to DBOptions. User can use this option to control which file types (Currently supported file tyes: kWALFile, kTableFile, kDescriptorFile.) should use the new Append and PositionedAppend APIs to handoff the verification information. Currently, RocksDB only use crc32c to calculate the checksum for write handoff.
-* Add an option, `CompressionOptions::max_dict_buffer_bytes`, to limit the in-memory buffering for selecting samples for generating/training a dictionary. The limit is currently loosely adhered to.
-
-
-## 6.17.0 (2021-01-15)
-### Behavior Changes
-* When verifying full file checksum with `DB::VerifyFileChecksums()`, we now fail with `Status::InvalidArgument` if the name of the checksum generator used for verification does not match the name of the checksum generator used for protecting the file when it was created.
-* Since RocksDB does not continue write the same file if a file write fails for any reason, the file scope write IO error is treated the same as retryable IO error. More information about error handling of file scope IO error is included in `ErrorHandler::SetBGError`.
-
-### Bug Fixes
-* Version older than 6.15 cannot decode VersionEdits `WalAddition` and `WalDeletion`, fixed this by changing the encoded format of them to be ignorable by older versions.
-* Fix a race condition between DB startups and shutdowns in managing the periodic background worker threads. One effect of this race condition could be the process being terminated.
-
-### Public API Change
-* Add a public API WriteBufferManager::dummy_entries_in_cache_usage() which reports the size of dummy entries stored in cache (passed to WriteBufferManager). Dummy entries are used to account for DataBlocks.
-* Add a SystemClock class that contains the time-related methods from Env.  The original methods in Env may be deprecated in a future release.  This class will allow easier testing, development, and expansion of time-related features.
-* Add a public API GetRocksBuildProperties and GetRocksBuildInfoAsString to get properties about the current build.  These properties may include settings related to the GIT settings (branch, timestamp).  This change also sets the "build date" based on the GIT properties, rather than the actual build time, thereby enabling more reproducible builds.
-
-## 6.16.0 (2020-12-18)
-### Behavior Changes
-* Attempting to write a merge operand without explicitly configuring `merge_operator` now fails immediately, causing the DB to enter read-only mode. Previously, failure was deferred until the `merge_operator` was needed by a user read or a background operation.
-
-### Bug Fixes
-* Truncated WALs ending in incomplete records can no longer produce gaps in the recovered data when `WALRecoveryMode::kPointInTimeRecovery` is used. Gaps are still possible when WALs are truncated exactly on record boundaries; for complete protection, users should enable `track_and_verify_wals_in_manifest`.
-* Fix a bug where compressed blocks read by MultiGet are not inserted into the compressed block cache when use_direct_reads = true.
-* Fixed the issue of full scanning on obsolete files when there are too many outstanding compactions with ConcurrentTaskLimiter enabled.
-* Fixed the logic of populating native data structure for `read_amp_bytes_per_bit` during OPTIONS file parsing on big-endian architecture. Without this fix, original code introduced in PR7659, when running on big-endian machine, can mistakenly store read_amp_bytes_per_bit (an uint32) in little endian format. Future access to `read_amp_bytes_per_bit` will give wrong values. Little endian architecture is not affected.
-* Fixed prefix extractor with timestamp issues.
-* Fixed a bug in atomic flush: in two-phase commit mode, the minimum WAL log number to keep is incorrect.
-* Fixed a bug related to checkpoint in PR7789: if there are multiple column families, and the checkpoint is not opened as read only, then in rare cases, data loss may happen in the checkpoint. Since backup engine relies on checkpoint, it may also be affected.
-* When ldb --try_load_options is used with the --column_family option, the ColumnFamilyOptions for the specified column family was not loaded from the OPTIONS file. Fix it so its loaded from OPTIONS and then overridden with command line overrides.
-
-### New Features
-* User defined timestamp feature supports `CompactRange` and `GetApproximateSizes`.
-* Support getting aggregated table properties (kAggregatedTableProperties and kAggregatedTablePropertiesAtLevel) with DB::GetMapProperty, for easier access to the data in a structured format.
-* Experimental option BlockBasedTableOptions::optimize_filters_for_memory now works with experimental Ribbon filter (as well as Bloom filter).
-
-### Public API Change
-* Deprecated public but rarely-used FilterBitsBuilder::CalculateNumEntry, which is replaced with ApproximateNumEntries taking a size_t parameter and returning size_t.
-* To improve portability the functions `Env::GetChildren` and `Env::GetChildrenFileAttributes` will no longer return entries for the special directories `.` or `..`.
-* Added a new option `track_and_verify_wals_in_manifest`. If `true`, the log numbers and sizes of the synced WALs are tracked in MANIFEST, then during DB recovery, if a synced WAL is missing from disk, or the WAL's size does not match the recorded size in MANIFEST, an error will be reported and the recovery will be aborted. Note that this option does not work with secondary instance.
-* `rocksdb_approximate_sizes` and `rocksdb_approximate_sizes_cf` in the C API now requires an error pointer (`char** errptr`) for receiving any error.
-* All overloads of DB::GetApproximateSizes now return Status, so that any failure to obtain the sizes is indicated to the caller.
-
-## 6.15.0 (2020-11-13)
+## Unreleased
 ### Bug Fixes
 * Fixed a bug in the following combination of features: indexes with user keys (`format_version >= 3`), indexes are partitioned (`index_type == kTwoLevelIndexSearch`), and some index partitions are pinned in memory (`BlockBasedTableOptions::pin_l0_filter_and_index_blocks_in_cache`). The bug could cause keys to be truncated when read from the index leading to wrong read results or other unexpected behavior.
 * Fixed a bug when indexes are partitioned (`index_type == kTwoLevelIndexSearch`), some index partitions are pinned in memory (`BlockBasedTableOptions::pin_l0_filter_and_index_blocks_in_cache`), and partitions reads could be mixed between block cache and directly from the file (e.g., with `enable_index_compression == 1` and `mmap_read == 1`, partitions that were stored uncompressed due to poor compression ratio would be read directly from the file via mmap, while partitions that were stored compressed would be read from block cache). The bug could cause index partitions to be mistakenly considered empty during reads leading to wrong read results.
 * Since 6.12, memtable lookup should report unrecognized value_type as corruption (#7121).
 * Since 6.14, fix false positive flush/compaction `Status::Corruption` failure when `paranoid_file_checks == true` and range tombstones were written to the compaction output files.
-* Since 6.14, fix a bug that could cause a stalled write to crash with mixed of slowdown and no_slowdown writes (`WriteOptions.no_slowdown=true`).
-* Fixed a bug which causes hang in closing DB when refit level is set in opt build. It was because ContinueBackgroundWork() was called in assert statement which is a no op. It was introduced in 6.14.
-* Fixed a bug which causes Get() to return incorrect result when a key's merge operand is applied twice. This can occur if the thread performing Get() runs concurrently with a background flush thread and another thread writing to the MANIFEST file (PR6069).
-* Reverted a behavior change silently introduced in 6.14.2, in which the effects of the `ignore_unknown_options` flag (used in option parsing/loading functions) changed.
-* Reverted a behavior change silently introduced in 6.14, in which options parsing/loading functions began returning `NotFound` instead of `InvalidArgument` for option names not available in the present version.
-* Fixed MultiGet bugs it doesn't return valid data with user defined timestamp.
-* Fixed a potential bug caused by evaluating `TableBuilder::NeedCompact()` before `TableBuilder::Finish()` in compaction job. For example, the `NeedCompact()` method of `CompactOnDeletionCollector` returned by built-in `CompactOnDeletionCollectorFactory` requires `BlockBasedTable::Finish()` to return the correct result. The bug can cause a compaction-generated file not to be marked for future compaction based on deletion ratio.
-* Fixed a seek issue with prefix extractor and timestamp.
-* Fixed a bug of encoding and parsing BlockBasedTableOptions::read_amp_bytes_per_bit as a 64-bit integer.
-* Fixed a bug of a recovery corner case, details in PR7621.

 ### Public API Change
 * Deprecate `BlockBasedTableOptions::pin_l0_filter_and_index_blocks_in_cache` and `BlockBasedTableOptions::pin_top_level_index_and_filter`. These options still take effect until users migrate to the replacement APIs in `BlockBasedTableOptions::metadata_cache_options`. Migration guidance can be found in the API comments on the deprecated options.
-* Add new API `DB::VerifyFileChecksums` to verify SST file checksum with corresponding entries in the MANIFEST if present. Current implementation requires scanning and recomputing file checksums.

-### Behavior Changes
-* The dictionary compression settings specified in `ColumnFamilyOptions::compression_opts` now additionally affect files generated by flush and compaction to non-bottommost level. Previously those settings at most affected files generated by compaction to bottommost level, depending on whether `ColumnFamilyOptions::bottommost_compression_opts` overrode them. Users who relied on dictionary compression settings in `ColumnFamilyOptions::compression_opts` affecting only the bottommost level can keep the behavior by moving their dictionary settings to `ColumnFamilyOptions::bottommost_compression_opts` and setting its `enabled` flag.
-* When the `enabled` flag is set in `ColumnFamilyOptions::bottommost_compression_opts`, those compression options now take effect regardless of the value in `ColumnFamilyOptions::bottommost_compression`. Previously, those compression options only took effect when `ColumnFamilyOptions::bottommost_compression != kDisableCompressionOption`. Now, they additionally take effect when `ColumnFamilyOptions::bottommost_compression == kDisableCompressionOption` (such a setting causes bottommost compression type to fall back to `ColumnFamilyOptions::compression_per_level` if configured, and otherwise fall back to `ColumnFamilyOptions::compression`).
-
-### New Features
-* An EXPERIMENTAL new Bloom alternative that saves about 30% space compared to Bloom filters, with about 3-4x construction time and similar query times is available using NewExperimentalRibbonFilterPolicy.
-
-## 6.14 (2020-10-09)
+## 6.14 (10/09/2020)
 ### Bug fixes
 * Fixed a bug after a `CompactRange()` with `CompactRangeOptions::change_level` set fails due to a conflict in the level change step, which caused all subsequent calls to `CompactRange()` with `CompactRangeOptions::change_level` set to incorrectly fail with a `Status::NotSupported("another thread is refitting")` error.
 * Fixed a bug that the bottom most level compaction could still be a trivial move even if `BottommostLevelCompaction.kForce` or `kForceOptimized` is set.
@@ -438,15 +25,12 @@
 * The settings of the DBOptions and ColumnFamilyOptions are now managed by Configurable objects (see New Features).  The same convenience methods to configure these options still exist but the backend implementation has been unified under a common implementation.

 ### New Features
-
 * Methods to configure serialize, and compare -- such as TableFactory -- are exposed directly through the Configurable base class (from which these objects inherit).  This change will allow for better and more thorough configuration management and retrieval in the future.  The options for a Configurable object can be set via the ConfigureFromMap, ConfigureFromString, or ConfigureOption method.  The serialized version of the options of an object can be retrieved via the GetOptionString, ToString, or GetOption methods.  The list of options supported by an object can be obtained via the GetOptionNames method.  The "raw" object (such as the BlockBasedTableOption) for an option may be retrieved via the GetOptions method.  Configurable options can be compared via the AreEquivalent method.  The settings within a Configurable object may be validated via the ValidateOptions method.  The object may be intialized (at which point only mutable options may be updated) via the PrepareOptions method.
 * Introduce options.check_flush_compaction_key_order with default value to be true. With this option, during flush and compaction, key order will be checked when writing to each SST file. If the order is violated, the flush or compaction will fail.
 * Added is_full_compaction to CompactionJobStats, so that the information is available through the EventListener interface.
 * Add more stats for MultiGet in Histogram to get number of data blocks, index blocks, filter blocks and sst files read from file system per level.
-* SST files have a new table property called db_host_id, which is set to the hostname by default. A new option in DBOptions, db_host_id, allows the property value to be overridden with a user specified string, or disable it completely by making the option string empty.
-* Methods to create customizable extensions -- such as TableFactory -- are exposed directly through the Customizable base class (from which these objects inherit).  This change will allow these Customizable classes to be loaded and configured in a standard way (via CreateFromString).  More information on how to write and use Customizable classes is in the customizable.h header file.

-## 6.13 (2020-09-12)
+## 6.13 (09/12/2020)
 ### Bug fixes
 * Fix a performance regression introduced in 6.4 that makes a upper bound check for every Next() even if keys are within a data block that is within the upper bound.
 * Fix a possible corruption to the LSM state (overlapping files within a level) when a `CompactRange()` for refitting levels (`CompactRangeOptions::change_level == true`) and another manual compaction are executed in parallel.
@@ -526,7 +110,7 @@
 * Reduce key comparisons during random access in all block-based tables.
 * BackupEngine avoids unnecessary repeated checksum computation for backing up a table file to the `shared_checksum` directory when using `share_files_with_checksum_naming = kUseDbSessionId` (new default), except on SST files generated before this version of RocksDB, which fall back on using `kLegacyCrc32cAndFileSize`.

-## 6.11 (2020-06-12)
+## 6.11 (6/12/2020)
 ### Bug Fixes
 * Fix consistency checking error swallowing in some cases when options.force_consistency_checks = true.
 * Fix possible false NotFound status from batched MultiGet using index type kHashSearch.
@@ -561,7 +145,7 @@
 ### Performance Improvements
 * Eliminate redundant key comparisons during random access in block-based tables.

-## 6.10 (2020-05-02)
+## 6.10 (5/2/2020)
 ### Bug Fixes
 * Fix wrong result being read from ingested file. May happen when a key in the file happen to be prefix of another key also in the file. The issue can further cause more data corruption. The issue exists with rocksdb >= 5.0.0 since DB::IngestExternalFile() was introduced.
 * Finish implementation of BlockBasedTableOptions::IndexType::kBinarySearchWithFirstKey. It's now ready for use. Significantly reduces read amplification in some setups, especially for iterator seeks.
@@ -593,7 +177,7 @@
 * Improve performance of batch MultiGet with partitioned filters, by sharing block cache lookups to applicable filter blocks.
 * Reduced memory copies when fetching and uncompressing compressed blocks from sst files.

-## 6.9.0 (2020-03-29)
+## 6.9.0 (03/29/2020)
 ### Behavior changes
 * Since RocksDB 6.8, ttl-based FIFO compaction can drop a file whose oldest key becomes older than options.ttl while others have not. This fix reverts this and makes ttl-based FIFO compaction use the file's flush time as the criterion. This fix also requires that max_open_files = -1 and compaction_options_fifo.allow_compaction = false to function properly.

@@ -620,7 +204,7 @@
 * Added a new option, best_efforts_recovery (default: false), to allow database to open in a db dir with missing table files. During best efforts recovery, missing table files are ignored, and database recovers to the most recent state without missing table file. Cross-column-family consistency is not guaranteed even if WAL is enabled.
 * options.bottommost_compression, options.compression_opts and options.bottommost_compression_opts are now dynamically changeable.

-## 6.8.0 (2020-02-24)
+## 6.8.0 (02/24/2020)
 ### Java API Changes
 * Major breaking changes to Java comparators, toward standardizing on ByteBuffer for performant, locale-neutral operations on keys (#6252).
 * Added overloads of common API methods using direct ByteBuffers for keys and values (#2283).
@@ -647,7 +231,7 @@
 * `db_bench` now supports `value_size_distribution_type`, `value_size_min`, `value_size_max` options for generating random variable sized value. Added `blob_db_compression_type` option for BlobDB to enable blob compression.
 * Replace RocksDB namespace "rocksdb" with flag "ROCKSDB_NAMESPACE" which if is not defined, defined as "rocksdb" in header file rocksdb_namespace.h.

-## 6.7.0 (2020-01-21)
+## 6.7.0 (01/21/2020)
 ### Public API Change
 * Added a rocksdb::FileSystem class in include/rocksdb/file_system.h to encapsulate file creation/read/write operations, and an option DBOptions::file_system to allow a user to pass in an instance of rocksdb::FileSystem. If its a non-null value, this will take precendence over DBOptions::env for file operations. A new API rocksdb::FileSystem::Default() returns a platform default object. The DBOptions::env option and Env::Default() API will continue to be used for threading and other OS related functions, and where DBOptions::file_system is not specified, for file operations. For storage developers who are accustomed to rocksdb::Env, the interface in rocksdb::FileSystem is new and will probably undergo some changes as more storage systems are ported to it from rocksdb::Env. As of now, no env other than Posix has been ported to the new interface.
 * A new rocksdb::NewSstFileManager() API that allows the caller to pass in separate Env and FileSystem objects.
@@ -672,11 +256,11 @@
 * Introduce ReadOptions.auto_prefix_mode. When set to true, iterator will return the same result as total order seek, but may choose to use prefix seek internally based on seek key and iterator upper bound.
 * MultiGet() can use IO Uring to parallelize read from the same SST file. This featuer is by default disabled. It can be enabled with environment variable ROCKSDB_USE_IO_URING.

-## 6.6.2 (2020-01-13)
+## 6.6.2 (01/13/2020)
 ### Bug Fixes
 * Fixed a bug where non-L0 compaction input files were not considered to compute the `creation_time` of new compaction outputs.

-## 6.6.1 (2020-01-02)
+## 6.6.1 (01/02/2020)
 ### Bug Fixes
 * Fix a bug in WriteBatchWithIndex::MultiGetFromBatchAndDB, which is called by Transaction::MultiGet, that causes due to stale pointer access when the number of keys is > 32
 * Fixed two performance issues related to memtable history trimming. First, a new SuperVersion is now created only if some memtables were actually trimmed. Second, trimming is only scheduled if there is at least one flushed memtable that is kept in memory for the purposes of transaction conflict checking.
@@ -686,7 +270,7 @@
 * Delete superversions in BackgroundCallPurge.
 * Fix use-after-free and double-deleting files in BackgroundCallPurge().

-## 6.6.0 (2019-11-25)
+## 6.6.0 (11/25/2019)
 ### Bug Fixes
 * Fix data corruption caused by output of intra-L0 compaction on ingested file not being placed in correct order in L0.
 * Fix a data race between Version::GetColumnFamilyMetaData() and Compaction::MarkFilesBeingCompacted() for access to being_compacted (#6056). The current fix acquires the db mutex during Version::GetColumnFamilyMetaData(), which may cause regression.
@@ -739,19 +323,19 @@
 * For 64-bit hashing, RocksDB is standardizing on a slightly modified preview version of XXH3. This function is now used for many non-persisted hashes, along with fastrange64() in place of the modulus operator, and some benchmarks show a slight improvement.
 * Level iterator to invlidate the iterator more often in prefix seek and the level is filtered out by prefix bloom.

-## 6.5.2 (2019-11-15)
+## 6.5.2 (11/15/2019)
 ### Bug Fixes
 * Fix a assertion failure in MultiGet() when BlockBasedTableOptions::no_block_cache is true and there is no compressed block cache
 * Fix a buffer overrun problem in BlockBasedTable::MultiGet() when compression is enabled and no compressed block cache is configured.
 * If a call to BackupEngine::PurgeOldBackups or BackupEngine::DeleteBackup suffered a crash, power failure, or I/O error, files could be left over from old backups that could only be purged with a call to GarbageCollect. Any call to PurgeOldBackups, DeleteBackup, or GarbageCollect should now suffice to purge such files.

-## 6.5.1 (2019-10-16)
+## 6.5.1 (10/16/2019)
 ### Bug Fixes
 * Revert the feature "Merging iterator to avoid child iterator reseek for some cases (#5286)" since it might cause strange results when reseek happens with a different iterator upper bound.
 * Fix a bug in BlockBasedTableIterator that might return incorrect results when reseek happens with a different iterator upper bound.
 * Fix a bug when partitioned filters and prefix search are used in conjunction, ::SeekForPrev could return invalid for an existing prefix. ::SeekForPrev might be called by the user, or internally on ::Prev, or within ::Seek if the return value involves Delete or a Merge operand.

-## 6.5.0 (2019-09-13)
+## 6.5.0 (9/13/2019)
 ### Bug Fixes
 * Fixed a number of data races in BlobDB.
 * Fix a bug where the compaction snapshot refresh feature is not disabled as advertised when `snap_refresh_nanos` is set to 0..
@@ -772,7 +356,7 @@
 ### Performance Improvements
 * Improve the speed of the MemTable Bloom filter, reducing the write overhead of enabling it by 1/3 to 1/2, with similar benefit to read performance.

-## 6.4.0 (2019-07-30)
+## 6.4.0 (7/30/2019)
 ### Default Option Change
 * LRUCacheOptions.high_pri_pool_ratio is set to 0.5 (previously 0.0) by default, which means that by default midpoint insertion is enabled. The same change is made for the default value of high_pri_pool_ratio argument in NewLRUCache(). When block cache is not explicitly created, the small block cache created by BlockBasedTable will still has this option to be 0.0.
 * Change BlockBasedTableOptions.cache_index_and_filter_blocks_with_high_priority's default value from false to true.
@@ -808,7 +392,7 @@
 * Fixed a regression where the fill_cache read option also affected index blocks.
 * Fixed an issue where using cache_index_and_filter_blocks==false affected partitions of partitioned indexes/filters as well.

-## 6.3.2 (2019-08-15)
+## 6.3.2 (8/15/2019)
 ### Public API Change
 * The semantics of the per-block-type block read counts in the performance context now match those of the generic block_read_count.

@@ -816,11 +400,11 @@
 * Fixed a regression where the fill_cache read option also affected index blocks.
 * Fixed an issue where using cache_index_and_filter_blocks==false affected partitions of partitioned indexes as well.

-## 6.3.1 (2019-07-24)
+## 6.3.1 (7/24/2019)
 ### Bug Fixes
 * Fix auto rolling bug introduced in 6.3.0, which causes segfault if log file creation fails.

-## 6.3.0 (2019-06-18)
+## 6.3.0 (6/18/2019)
 ### Public API Change
 * Now DB::Close() will return Aborted() error when there is unreleased snapshot. Users can retry after all snapshots are released.
 * Index blocks are now handled similarly to data blocks with regards to the block cache: instead of storing objects in the cache, only the blocks themselves are cached. In addition, index blocks no longer get evicted from the cache when a table is closed, can now use the compressed block cache (if any), and can be shared among multiple table readers.
@@ -857,7 +441,7 @@
 * Fix a bug caused by secondary not skipping the beginning of new MANIFEST.
 * On DB open, delete WAL trash files left behind in wal_dir

-## 6.2.0 (2019-04-30)
+## 6.2.0 (4/30/2019)
 ### New Features
 * Add an option `strict_bytes_per_sync` that causes a file-writing thread to block rather than exceed the limit on bytes pending writeback specified by `bytes_per_sync` or `wal_bytes_per_sync`.
 * Improve range scan performance by avoiding per-key upper bound check in BlockBasedTableIterator.
@@ -879,7 +463,7 @@
 * Close a WAL file before another thread deletes it.
 * Fix an assertion failure `IsFlushPending() == true` caused by one bg thread releasing the db mutex in ~ColumnFamilyData and another thread clearing `flush_requested_` flag.

-## 6.1.1 (2019-04-09)
+## 6.1.1 (4/9/2019)
 ### New Features
 * When reading from option file/string/map, customized comparators and/or merge operators can be filled according to object registry.

@@ -889,7 +473,7 @@
 * Fix a bug in 2PC where a sequence of txn prepare, memtable flush, and crash could result in losing the prepared transaction.
 * Fix a bug in Encryption Env which could cause encrypted files to be read beyond file boundaries.

-## 6.1.0 (2019-03-27)
+## 6.1.0 (3/27/2019)
 ### New Features
 * Introduce two more stats levels, kExceptHistogramOrTimers and kExceptTimers.
 * Added a feature to perform data-block sampling for compressibility, and report stats to user.
@@ -907,7 +491,7 @@
 * Fix JEMALLOC_CXX_THROW macro missing from older Jemalloc versions, causing build failures on some platforms.
 * Fix SstFileReader not able to open file ingested with write_glbal_seqno=true.

-## 6.0.0 (2019-02-19)
+## 6.0.0 (2/19/2019)
 ### New Features
 * Enabled checkpoint on readonly db (DBImplReadOnly).
 * Make DB ignore dropped column families while committing results of atomic flush.
@@ -949,7 +533,7 @@
 ### Change Default Options
 * Change options.compaction_pri's default to kMinOverlappingRatio

-## 5.18.0 (2018-11-30)
+## 5.18.0 (11/30/2018)
 ### New Features
 * Introduced `JemallocNodumpAllocator` memory allocator. When being use, block cache will be excluded from core dump.
 * Introduced `PerfContextByLevel` as part of `PerfContext` which allows storing perf context at each level. Also replaced `__thread` with `thread_local` keyword for perf_context. Added per-level perf context for bloom filter and `Get` query.
@@ -977,7 +561,7 @@
 * Start populating `NO_FILE_CLOSES` ticker statistic, which was always zero previously.
 * The default value of NewBloomFilterPolicy()'s argument use_block_based_builder is changed to false. Note that this new default may cause large temp memory usage when building very large SST files.

-## 5.17.0 (2018-10-05)
+## 5.17.0 (10/05/2018)
 ### Public API Change
 * `OnTableFileCreated` will now be called for empty files generated during compaction. In that case, `TableFileCreationInfo::file_path` will be "(nil)" and `TableFileCreationInfo::file_size` will be zero.
 * Add `FlushOptions::allow_write_stall`, which controls whether Flush calls start working immediately, even if it causes user writes to stall, or will wait until flush can be performed without causing write stall (similar to `CompactRangeOptions::allow_write_stall`). Note that the default value is false, meaning we add delay to Flush calls until stalling can be avoided when possible. This is behavior change compared to previous RocksDB versions, where Flush calls didn't check if they might cause stall or not.
@@ -991,21 +575,21 @@
 * Avoid creating empty SSTs and subsequently deleting them in certain cases during compaction.
 * Sync CURRENT file contents during checkpoint.

-## 5.16.3 (2018-10-01)
+## 5.16.3 (10/1/2018)
 ### Bug Fixes
 * Fix crash caused when `CompactFiles` run with `CompactionOptions::compression == CompressionType::kDisableCompressionOption`. Now that setting causes the compression type to be chosen according to the column family-wide compression options.

-## 5.16.2 (2018-09-21)
+## 5.16.2 (9/21/2018)
 ### Bug Fixes
 * Fix bug in partition filters with format_version=4.

-## 5.16.1 (2018-09-17)
+## 5.16.1 (9/17/2018)
 ### Bug Fixes
 * Remove trace_analyzer_tool from rocksdb_lib target in TARGETS file.
 * Fix RocksDB Java build and tests.
 * Remove sync point in Block destructor.

-## 5.16.0 (2018-08-21)
+## 5.16.0 (8/21/2018)
 ### Public API Change
 * The merge operands are passed to `MergeOperator::ShouldMerge` in the reversed order relative to how they were merged (passed to FullMerge or FullMergeV2) for performance reasons
 * GetAllKeyVersions() to take an extra argument of `max_num_ikeys`.
@@ -1019,7 +603,7 @@
 ### Bug Fixes
 * Fix a bug in misreporting the estimated partition index size in properties block.

-## 5.15.0 (2018-07-17)
+## 5.15.0 (7/17/2018)
 ### Public API Change
 * Remove managed iterator. ReadOptions.managed is not effective anymore.
 * For bottommost_compression, a compatible CompressionOptions is added via `bottommost_compression_opts`. To keep backward compatible, a new boolean `enabled` is added to CompressionOptions. For compression_opts, it will be always used no matter what value of `enabled` is. For bottommost_compression_opts, it will only be used when user set `enabled=true`, otherwise, compression_opts will be used for bottommost_compression as default.
@@ -1045,7 +629,7 @@
 * Fix a bug caused by not copying the block trailer with compressed SST file, direct IO, prefetcher and no compressed block cache.
 * Fix write can stuck indefinitely if enable_pipelined_write=true. The issue exists since pipelined write was introduced in 5.5.0.

-## 5.14.0 (2018-05-16)
+## 5.14.0 (5/16/2018)
 ### Public API Change
 * Add a BlockBasedTableOption to align uncompressed data blocks on the smaller of block size or page size boundary, to reduce flash reads by avoiding reads spanning 4K pages.
 * The background thread naming convention changed (on supporting platforms) to "rocksdb:<thread pool priority><thread number>", e.g., "rocksdb:low0".
@@ -1078,7 +662,7 @@
 * Add `BlockBasedTableConfig.setBlockCache` to allow sharing a block cache across DB instances.
 * Added SstFileManager to the Java API to allow managing SST files across DB instances.

-## 5.13.0 (2018-03-20)
+## 5.13.0 (3/20/2018)
 ### Public API Change
 * RocksDBOptionsParser::Parse()'s `ignore_unknown_options` argument will only be effective if the option file shows it is generated using a higher version of RocksDB than the current version.
 * Remove CompactionEventListener.
@@ -1094,7 +678,7 @@
 * Fix a leak in prepared_section_completed_ where the zeroed entries would not removed from the map.
 * Fix WAL corruption caused by race condition between user write thread and backup/checkpoint thread.

-## 5.12.0 (2018-02-14)
+## 5.12.0 (2/14/2018)
 ### Public API Change
 * Iterator::SeekForPrev is now a pure virtual method. This is to prevent user who implement the Iterator interface fail to implement SeekForPrev by mistake.
 * Add `include_end` option to make the range end exclusive when `include_end == false` in `DeleteFilesInRange()`.
@@ -1116,7 +700,7 @@
 * Fix advance reservation of arena block addresses.
 * Fix handling of empty string as checkpoint directory.

-## 5.11.0 (2018-01-08)
+## 5.11.0 (01/08/2018)
 ### Public API Change
 * Add `autoTune` and `getBytesPerSecond()` to RocksJava RateLimiter

@@ -1133,7 +717,7 @@
 * Fix a mislabel bug for bottom-pri compaction threads.
 * Fix DB::Flush() keep waiting after flush finish under certain condition.

-## 5.10.0 (2017-12-11)
+## 5.10.0 (12/11/2017)
 ### Public API Change
 * When running `make` with environment variable `USE_SSE` set and `PORTABLE` unset, will use all machine features available locally. Previously this combination only compiled SSE-related features.

@@ -1148,7 +732,7 @@
 * Fix performance issue in `IngestExternalFile()` affecting databases with large number of SST files.
 * Fix possible corruption to LSM structure when `DeleteFilesInRange()` deletes a subset of files spanned by a `DeleteRange()` marker.

-## 5.9.0 (2017-11-01)
+## 5.9.0 (11/1/2017)
 ### Public API Change
 * `BackupableDBOptions::max_valid_backups_to_open == 0` now means no backups will be opened during BackupEngine initialization. Previously this condition disabled limiting backups opened.
 * `DBOptions::preserve_deletes` is a new option that allows one to specify that DB should not drop tombstones for regular deletes if they have sequence number larger than what was set by the new API call `DB::SetPreserveDeletesSequenceNumber(SequenceNumber seqnum)`. Disabled by default.
@@ -1175,7 +759,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Fix a potential data inconsistency issue during point-in-time recovery. `DB:Open()` will abort if column family inconsistency is found during PIT recovery.
 * Fix possible metadata corruption in databases using `DeleteRange()`.

-## 5.8.0 (2017-08-30)
+## 5.8.0 (08/30/2017)
 ### Public API Change
 * Users of `Statistics::getHistogramString()` will see fewer histogram buckets and different bucket endpoints.
 * `Slice::compare` and BytewiseComparator `Compare` no longer accept `Slice`s containing nullptr.
@@ -1195,7 +779,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Fix transient reappearance of keys covered by range deletions when memtable prefix bloom filter is enabled.
 * Fix potentially wrong file smallest key when range deletions separated by snapshot are written together.

-## 5.7.0 (2017-07-13)
+## 5.7.0 (07/13/2017)
 ### Public API Change
 * DB property "rocksdb.sstables" now prints keys in hex form.

@@ -1210,7 +794,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Bug Fixes
 * Fix discarding empty compaction output files when `DeleteRange()` is used together with subcompactions.

-## 5.6.0 (2017-06-06)
+## 5.6.0 (06/06/2017)
 ### Public API Change
 * Scheduling flushes and compactions in the same thread pool is no longer supported by setting `max_background_flushes=0`. Instead, users can achieve this by configuring their high-pri thread pool to have zero threads.
 * Replace `Options::max_background_flushes`, `Options::max_background_compactions`, and `Options::base_background_compactions` all with `Options::max_background_jobs`, which automatically decides how many threads to allocate towards flush/compaction.
@@ -1227,7 +811,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Bug Fixes
 * Shouldn't ignore return value of fsync() in flush.

-## 5.5.0 (2017-05-17)
+## 5.5.0 (05/17/2017)
 ### New Features
 * FIFO compaction to support Intra L0 compaction too with CompactionOptionsFIFO.allow_compaction=true.
 * DB::ResetStats() to reset internal stats.
@@ -1244,7 +828,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Bug Fixes
 * Fix the bug that Direct I/O uses direct reads for non-SST file

-## 5.4.0 (2017-04-11)
+## 5.4.0 (04/11/2017)
 ### Public API Change
 * random_access_max_buffer_size no longer has any effect
 * Removed Env::EnableReadAhead(), Env::ShouldForwardRawRequest()
@@ -1261,7 +845,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Introduce level-based L0->L0 compactions to reduce file count, so write delays are incurred less often.
 * (Experimental) Partitioning filters which creates an index on the partitions. The feature can be enabled by setting partition_filters when using kFullFilter. Currently the feature also requires two-level indexing to be enabled. Number of partitions is the same as the number of partitions for indexes, which is controlled by metadata_block_size.

-## 5.3.0 (2017-03-08)
+## 5.3.0 (03/08/2017)
 ### Public API Change
 * Remove disableDataSync option.
 * Remove timeout_hint_us option from WriteOptions. The option has been deprecated and has no effect since 3.13.0.
@@ -1271,7 +855,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Bug Fixes
 * Fix the bug that iterator may skip keys

-## 5.2.0 (2017-02-08)
+## 5.2.0 (02/08/2017)
 ### Public API Change
 * NewLRUCache() will determine number of shard bits automatically based on capacity, if the user doesn't pass one. This also impacts the default block cache when the user doesn't explicit provide one.
 * Change the default of delayed slowdown value to 16MB/s and further increase the L0 stop condition to 36 files.
@@ -1289,7 +873,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Some fixes related to 2PC.
 * Fix bugs of data corruption in direct I/O

-## 5.1.0 (2017-01-13)
+## 5.1.0 (01/13/2017)
 * Support dynamically change `delete_obsolete_files_period_micros` option via SetDBOptions().
 * Added EventListener::OnExternalFileIngested which will be called when IngestExternalFile() add a file successfully.
 * BackupEngine::Open and BackupEngineReadOnly::Open now always return error statuses matching those of the backup Env.
@@ -1298,7 +882,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Fix the bug that if 2PC is enabled, checkpoints may loss some recent transactions.
 * When file copying is needed when creating checkpoints or bulk loading files, fsync the file after the file copying.

-## 5.0.0 (2016-11-17)
+## 5.0.0 (11/17/2016)
 ### Public API Change
 * Options::max_bytes_for_level_multiplier is now a double along with all getters and setters.
 * Support dynamically change `delayed_write_rate` and `max_total_wal_size` options via SetDBOptions().
@@ -1317,7 +901,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add LuaCompactionFilter in utilities.  This allows developers to write compaction filters in Lua.  To use this feature, LUA_PATH needs to be set to the root directory of Lua.
 * No longer populate "LATEST_BACKUP" file in backup directory, which formerly contained the number of the latest backup. The latest backup can be determined by finding the highest numbered file in the "meta/" subdirectory.

-## 4.13.0 (2016-10-18)
+## 4.13.0 (10/18/2016)
 ### Public API Change
 * DB::GetOptions() reflect dynamic changed options (i.e. through DB::SetOptions()) and return copy of options instead of reference.
 * Added Statistics::getAndResetTickerCount().
@@ -1326,7 +910,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add DB::SetDBOptions() to dynamic change base_background_compactions and max_background_compactions.
 * Added Iterator::SeekForPrev(). This new API will seek to the last key that less than or equal to the target key.

-## 4.12.0 (2016-09-12)
+## 4.12.0 (9/12/2016)
 ### Public API Change
 * CancelAllBackgroundWork() flushes all memtables for databases containing writes that have bypassed the WAL (writes issued with WriteOptions::disableWAL=true) before shutting down background threads.
 * Merge options source_compaction_factor, max_grandparent_overlap_bytes and expanded_compaction_factor into max_compaction_bytes.
@@ -1338,7 +922,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Change ticker/histogram statistics implementations to accumulate data in thread-local storage, which improves CPU performance by reducing cache coherency costs. Callers of CreateDBStatistics do not need to change anything to use this feature.
 * Block cache mid-point insertion, where index and filter block are inserted into LRU block cache with higher priority. The feature can be enabled by setting BlockBasedTableOptions::cache_index_and_filter_blocks_with_high_priority to true and high_pri_pool_ratio > 0 when creating NewLRUCache.

-## 4.11.0 (2016-08-01)
+## 4.11.0 (8/1/2016)
 ### Public API Change
 * options.memtable_prefix_bloom_huge_page_tlb_size => memtable_huge_page_size. When it is set, RocksDB will try to allocate memory from huge page for memtable too, rather than just memtable bloom filter.

@@ -1346,7 +930,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * A tool to migrate DB after options change. See include/rocksdb/utilities/option_change_migration.h.
 * Add ReadOptions.background_purge_on_iterator_cleanup. If true, we avoid file deletion when destroying iterators.

-## 4.10.0 (2016-07-05)
+## 4.10.0 (7/5/2016)
 ### Public API Change
 * options.memtable_prefix_bloom_bits changes to options.memtable_prefix_bloom_bits_ratio and deprecate options.memtable_prefix_bloom_probes
 * enum type CompressionType and PerfLevel changes from char to unsigned char. Value of all PerfLevel shift by one.
@@ -1358,7 +942,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * RepairDB support for column families. RepairDB now associates data with non-default column families using information embedded in the SST/WAL files (4.7 or later). For data written by 4.6 or earlier, RepairDB associates it with the default column family.
 * Add options.write_buffer_manager which allows users to control total memtable sizes across multiple DB instances.

-## 4.9.0 (2016-06-09)
+## 4.9.0 (6/9/2016)
 ### Public API changes
 * Add bottommost_compression option, This option can be used to set a specific compression algorithm for the bottommost level (Last level containing files in the DB).
 * Introduce CompactionJobInfo::compression, This field state the compression algorithm used to generate the output files of the compaction.
@@ -1368,7 +952,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### New Features
 * Introduce NewSimCache() in rocksdb/utilities/sim_cache.h. This function creates a block cache that is able to give simulation results (mainly hit rate) of simulating block behavior with a configurable cache size.

-## 4.8.0 (2016-05-02)
+## 4.8.0 (5/2/2016)
 ### Public API Change
 * Allow preset compression dictionary for improved compression of block-based tables. This is supported for zlib, zstd, and lz4. The compression dictionary's size is configurable via CompressionOptions::max_dict_bytes.
 * Delete deprecated classes for creating backups (BackupableDB) and restoring from backups (RestoreBackupableDB). Now, BackupEngine should be used for creating backups, and BackupEngineReadOnly should be used for restorations. For more details, see https://github.com/facebook/rocksdb/wiki/How-to-backup-RocksDB%3F
@@ -1378,12 +962,12 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### New Features
 * Add ReadOptions::readahead_size. If non-zero, NewIterator will create a new table reader which performs reads of the given size.

-## 4.7.0 (2016-04-08)
+## 4.7.0 (4/8/2016)
 ### Public API Change
 * rename options compaction_measure_io_stats to report_bg_io_stats and include flush too.
 * Change some default options. Now default options will optimize for server-workloads. Also enable slowdown and full stop triggers for pending compaction bytes. These changes may cause sub-optimal performance or significant increase of resource usage. To avoid these risks, users can open existing RocksDB with options extracted from RocksDB option files. See https://github.com/facebook/rocksdb/wiki/RocksDB-Options-File for how to use RocksDB option files. Or you can call Options.OldDefaults() to recover old defaults. DEFAULT_OPTIONS_HISTORY.md will track change history of default options.

-## 4.6.0 (2016-03-10)
+## 4.6.0 (3/10/2016)
 ### Public API Changes
 * Change default of BlockBasedTableOptions.format_version to 2. It means default DB created by 4.6 or up cannot be opened by RocksDB version 3.9 or earlier.
 * Added strict_capacity_limit option to NewLRUCache. If the flag is set to true, insert to cache will fail if no enough capacity can be free. Signature of Cache::Insert() is updated accordingly.
@@ -1394,7 +978,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add CompactionPri::kMinOverlappingRatio, a compaction picking mode friendly to write amplification.
 * Deprecate Iterator::IsKeyPinned() and replace it with Iterator::GetProperty() with prop_name="rocksdb.iterator.is.key.pinned"

-## 4.5.0 (2016-02-05)
+## 4.5.0 (2/5/2016)
 ### Public API Changes
 * Add a new perf context level between kEnableCount and kEnableTime. Level 2 now does not include timers for mutexes.
 * Statistics of mutex operation durations will not be measured by default. If you want to have them enabled, you need to set Statistics::stats_level_ to kAll.
@@ -1405,7 +989,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add kPersistedTier to ReadTier.  This option allows Get and MultiGet to read only the persited data and skip mem-tables if writes were done with disableWAL = true.
 * Add DBOptions::sst_file_manager. Use NewSstFileManager() in include/rocksdb/sst_file_manager.h to create a SstFileManager that can be used to track the total size of SST files and control the SST files deletion rate.

-## 4.4.0 (2016-01-14)
+## 4.4.0 (1/14/2016)
 ### Public API Changes
 * Change names in CompactionPri and add a new one.
 * Deprecate options.soft_rate_limit and add options.soft_pending_compaction_bytes_limit.
@@ -1415,7 +999,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Increase default options.delayed_write_rate to 2MB/s.
 * Added a new parameter --path to ldb tool. --path accepts the name of either MANIFEST, SST or a WAL file. Either --db or --path can be used when calling ldb.

-## 4.3.0 (2015-12-08)
+## 4.3.0 (12/8/2015)
 ### New Features
 * CompactionFilter has new member function called IgnoreSnapshots which allows CompactionFilter to be called even if there are snapshots later than the key.
 * RocksDB will now persist options under the same directory as the RocksDB database on successful DB::Open, CreateColumnFamily, DropColumnFamily, and SetOptions.
@@ -1425,7 +1009,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Public API Changes
 * When options.db_write_buffer_size triggers, only the column family with the largest column family size will be flushed, not all the column families.

-## 4.2.0 (2015-11-09)
+## 4.2.0 (11/9/2015)
 ### New Features
 * Introduce CreateLoggerFromOptions(), this function create a Logger for provided DBOptions.
 * Add GetAggregatedIntProperty(), which returns the sum of the GetIntProperty of all the column families.
@@ -1438,7 +1022,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Remove DefaultCompactionFilterFactory.


-## 4.1.0 (2015-10-08)
+## 4.1.0 (10/8/2015)
 ### New Features
 * Added single delete operation as a more efficient way to delete keys that have not been overwritten.
 * Added experimental AddFile() to DB interface that allow users to add files created by SstFileWriter into an empty Database, see include/rocksdb/sst_file_writer.h and DB::AddFile() for more info.
@@ -1452,7 +1036,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * CompactionFilter has a new method FilterMergeOperand() that RocksDB applies to every merge operand during compaction to decide whether to filter the operand.
 * We removed CompactionFilterV2 interfaces from include/rocksdb/compaction_filter.h. The functionality was deprecated already in version 3.13.

-## 4.0.0 (2015-09-09)
+## 4.0.0 (9/9/2015)
 ### New Features
 * Added support for transactions.  See include/rocksdb/utilities/transaction.h for more info.
 * DB::GetProperty() now accepts "rocksdb.aggregated-table-properties" and "rocksdb.aggregated-table-properties-at-levelN", in which case it returns aggregated table properties of the target column family, or the aggregated table properties of the specified level N if the "at-level" version is used.
@@ -1465,7 +1049,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Added Equal() method to the Comparator interface that can optionally be overwritten in cases where equality comparisons can be done more efficiently than three-way comparisons.
 * Previous 'experimental' OptimisticTransaction class has been replaced by Transaction class.

-## 3.13.0 (2015-08-06)
+## 3.13.0 (8/6/2015)
 ### New Features
 * RollbackToSavePoint() in WriteBatch/WriteBatchWithIndex
 * Add NewCompactOnDeletionCollectorFactory() in utilities/table_properties_collectors, which allows rocksdb to mark a SST file as need-compaction when it observes at least D deletion entries in any N consecutive entries in that SST file.  Note that this feature depends on an experimental NeedCompact() API --- the result of this API will not persist after DB restart.
@@ -1480,7 +1064,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add statistics::getHistogramString() to print detailed distribution of a histogram metric.
 * Add DBOptions::skip_stats_update_on_db_open.  When it is on, DB::Open() will run faster as it skips the random reads required for loading necessary stats from SST files to optimize compaction.

-## 3.12.0 (2015-07-02)
+## 3.12.0 (7/2/2015)
 ### New Features
 * Added experimental support for optimistic transactions.  See include/rocksdb/utilities/optimistic_transaction.h for more info.
 * Added a new way to report QPS from db_bench (check out --report_file and --report_interval_seconds)
@@ -1510,7 +1094,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add BackupEngineImpl.options_.max_background_operations to specify the maximum number of operations that may be performed in parallel. Add support for parallelized backup and restore.
 * Add DB::SyncWAL() that does a WAL sync without blocking writers.

-## 3.11.0 (2015-05-19)
+## 3.11.0 (5/19/2015)
 ### New Features
 * Added a new API Cache::SetCapacity(size_t capacity) to dynamically change the maximum configured capacity of the cache. If the new capacity is less than the existing cache usage, the implementation will try to lower the usage by evicting the necessary number of elements following a strict LRU policy.
 * Added an experimental API for handling flashcache devices (blacklists background threads from caching their reads) -- NewFlashcacheAwareEnv
@@ -1521,7 +1105,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * TablePropertiesCollector::AddUserKey() is added to replace TablePropertiesCollector::Add(). AddUserKey() exposes key type, sequence number and file size up to now to users.
 * DBOptions::bytes_per_sync used to apply to both WAL and table files. As of 3.11 it applies only to table files. If you want to use this option to sync WAL in the background, please use wal_bytes_per_sync

-## 3.10.0 (2015-03-24)
+## 3.10.0 (3/24/2015)
 ### New Features
 * GetThreadStatus() is now able to report detailed thread status, including:
 - Thread Operation including flush and compaction.
@@ -1556,7 +1140,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * lz4 compression is now included in rocksjava static library when running `make rocksdbjavastatic`.
 * Overflowing a size_t when setting rocksdb options now throws an IllegalArgumentException, which removes the necessity for a developer to catch these Exceptions explicitly.

-## 3.9.0 (2014-12-08)
+## 3.9.0 (12/8/2014)

 ### New Features
 * Add rocksdb::GetThreadList(), which in the future will return the current status of all
@@ -1575,7 +1159,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Improvements
 * RocksDBLite library now becomes smaller and will be compiled with -fno-exceptions flag.

-## 3.8.0 (2014-11-14)
+## 3.8.0 (11/14/2014)

 ### Public API changes
 * BackupEngine::NewBackupEngine() was deprecated; please use BackupEngine::Open() from now on.
@@ -1589,14 +1173,14 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * CompactFiles and EventListener, although they are still in experimental state
 * Full ColumnFamily support in RocksJava.

-## 3.7.0 (2014-11-06)
+## 3.7.0 (11/6/2014)
 ### Public API changes
 * Introduce SetOptions() API to allow adjusting a subset of options dynamically online
 * Introduce 4 new convenient functions for converting Options from string: GetColumnFamilyOptionsFromMap(), GetColumnFamilyOptionsFromString(), GetDBOptionsFromMap(), GetDBOptionsFromString()
 * Remove WriteBatchWithIndex.Delete() overloads using SliceParts
 * When opening a DB, if options.max_background_compactions is larger than the existing low pri pool of options.env, it will enlarge it. Similarly, options.max_background_flushes is larger than the existing high pri pool of options.env, it will enlarge it.

-## 3.6.0 (2014-10-07)
+## 3.6.0 (10/7/2014)
 ### Disk format changes
 * If you're using RocksDB on ARM platforms and you're using default bloom filter, there is a disk format change you need to be aware of. There are three steps you need to do when you convert to new release: 1. turn off filter policy, 2. compact the whole database, 3. turn on filter policy

@@ -1609,7 +1193,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Change target_file_size_base type to uint64_t from int.
 * Remove allow_thread_local. This feature was proved to be stable, so we are turning it always-on.

-## 3.5.0 (2014-09-03)
+## 3.5.0 (9/3/2014)
 ### New Features
 * Add include/utilities/write_batch_with_index.h, providing a utility class to query data out of WriteBatch when building it.
 * Move BlockBasedTable related options to BlockBasedTableOptions from Options. Change corresponding JNI interface. Options affected include:
@@ -1620,7 +1204,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Public API changes
 * The Prefix Extractor used with V2 compaction filters is now passed user key to SliceTransform::Transform instead of unparsed RocksDB key.

-## 3.4.0 (2014-08-18)
+## 3.4.0 (8/18/2014)
 ### New Features
 * Support Multiple DB paths in universal style compactions
 * Add feature of storing plain table index and bloom filter in SST file.
@@ -1636,7 +1220,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 * Add DB::GetIntProperty(), which returns DB properties that are integer as uint64_t.
 * The Prefix Extractor used with V2 compaction filters is now passed user key to SliceTransform::Transform instead of unparsed RocksDB key.

-## 3.3.0 (2014-07-10)
+## 3.3.0 (7/10/2014)
 ### New Features
 * Added JSON API prototype.
 * HashLinklist reduces performance outlier caused by skewed bucket by switching data in the bucket from linked list to skip list. Add parameter threshold_use_skiplist in NewHashLinkListRepFactory().
@@ -1647,7 +1231,7 @@ if set to something > 0 user will see 2 changes in iterators behavior 1) only ke
 ### Public API changes
 * Removed NewTotalOrderPlainTableFactory because it is not used and implemented semantically incorrect.

-## 3.2.0 (2014-06-20)
+## 3.2.0 (06/20/2014)

 ### Public API changes
 * We removed seek compaction as a concept from RocksDB because:
@@ -1665,7 +1249,7 @@ Because of that, Options::disable_seek_compaction is now obsolete. It is still a
 ### Performance Improvements
 * Tailing Iterator re-implemeted with ForwardIterator + Cascading Search Hint , see ~20% throughput improvement.

-## 3.1.0 (2014-05-21)
+## 3.1.0 (05/21/2014)

 ### Public API changes
 * Replaced ColumnFamilyOptions::table_properties_collectors with ColumnFamilyOptions::table_properties_collector_factories
@@ -1674,7 +1258,7 @@ Because of that, Options::disable_seek_compaction is now obsolete. It is still a
 * Hash index for block-based table will be materialized and reconstructed more efficiently. Previously hash index is constructed by scanning the whole table during every table open.
 * FIFO compaction style

-## 3.0.0 (2014-05-05)
+## 3.0.0 (05/05/2014)

 ### Public API changes
 * Added _LEVEL to all InfoLogLevel enums
@@ -1686,7 +1270,7 @@ Because of that, Options::disable_seek_compaction is now obsolete. It is still a
 * Added an option to use different checksum functions in BlockBasedTableOptions
 * Added ApplyToAllCacheEntries() function to Cache

-## 2.8.0 (2014-04-04)
+## 2.8.0 (04/04/2014)

 * Removed arena.h from public header files.
 * By default, checksums are verified on every read from database
@@ -1715,7 +1299,7 @@ Because of that, Options::disable_seek_compaction is now obsolete. It is still a
 * Now compaction filter has a V2 interface. It buffers the kv-pairs sharing the same key prefix, process them in batches, and return the batched results back to DB. The new interface uses a new structure CompactionFilterContext for the same purpose as CompactionFilter::Context in V1.
 * Geo-spatial support for locations and radial-search.

-## 2.7.0 (2014-01-28)
+## 2.7.0 (01/28/2014)

 ### Public API changes

@@ -43,8 +43,6 @@ to build a portable binary, add `PORTABLE=1` before your make commands, like thi
      command line flags processing. You can compile rocksdb library even
      if you don't have gflags installed.

-* `make check` will also check code formatting, which requires [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
-
 * If you wish to build the RocksJava static target, then cmake is required for building Snappy.

 ## Supported platforms
@@ -96,21 +94,12 @@ to build a portable binary, add `PORTABLE=1` before your make commands, like thi
              sudo yum install libasan

    * Install zstandard:
-        * With [EPEL](https://fedoraproject.org/wiki/EPEL):

-              sudo yum install libzstd-devel
-
-        * With CentOS 8:
-
-              sudo dnf install libzstd-devel
-
-        * From source:
-
-              wget https://github.com/facebook/zstd/archive/v1.1.3.tar.gz
-              mv v1.1.3.tar.gz zstd-1.1.3.tar.gz
-              tar zxvf zstd-1.1.3.tar.gz
-              cd zstd-1.1.3
-              make && sudo make install
+             wget https://github.com/facebook/zstd/archive/v1.1.3.tar.gz
+             mv v1.1.3.tar.gz zstd-1.1.3.tar.gz
+             tar zxvf zstd-1.1.3.tar.gz
+             cd zstd-1.1.3
+             make && sudo make install

 * **OS X**:
    * Install latest C++ compiler that supports C++ 11:
@@ -1,6 +1,6 @@
 This is the list of all known third-party language bindings for RocksDB. If something is missing, please open a pull request to add it.

-* Java - https://github.com/facebook/rocksdb/tree/main/java
+* Java - https://github.com/facebook/rocksdb/tree/master/java
 * Python
    * http://python-rocksdb.readthedocs.io/en/latest/
    * http://pyrocksdb.readthedocs.org/en/latest/ (unmaintained)
@@ -1,4 +0,0 @@
-This is the list of all known third-party plugins for RocksDB. If something is missing, please open a pull request to add it.
-
-* [Dedupfs](https://github.com/ajkr/dedupfs): an example for plugin developers to reference
-* [ZenFS](https://github.com/westerndigitalcorporation/zenfs): a file system for zoned block devices
@@ -1,9 +1,9 @@
 ## RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

 [![CircleCI Status](https://circleci.com/gh/facebook/rocksdb.svg?style=svg)](https://circleci.com/gh/facebook/rocksdb)
-[![TravisCI Status](https://api.travis-ci.com/facebook/rocksdb.svg?branch=main)](https://travis-ci.com/github/facebook/rocksdb)
-[![Appveyor Build status](https://ci.appveyor.com/api/projects/status/fbgfu0so3afcno78/branch/main?svg=true)](https://ci.appveyor.com/project/Facebook/rocksdb/branch/main)
-[![PPC64le Build Status](http://140-211-168-68-openstack.osuosl.org:8080/buildStatus/icon?job=rocksdb&style=plastic)](http://140-211-168-68-openstack.osuosl.org:8080/job/rocksdb)
+[![TravisCI Status](https://travis-ci.org/facebook/rocksdb.svg?branch=master)](https://travis-ci.org/facebook/rocksdb)
+[![Appveyor Build status](https://ci.appveyor.com/api/projects/status/fbgfu0so3afcno78/branch/master?svg=true)](https://ci.appveyor.com/project/Facebook/rocksdb/branch/master)
+[![PPC64le Build Status](http://140.211.168.68:8080/buildStatus/icon?job=Rocksdb)](http://140.211.168.68:8080/job/Rocksdb)

 RocksDB is developed and maintained by Facebook Database Engineering Team.
 It is built on earlier work on [LevelDB](https://github.com/google/leveldb) by Sanjay Ghemawat (sanjay@google.com)
@@ -17,7 +17,7 @@ and Space-Amplification-Factor (SAF). It has multi-threaded compactions,
 making it especially suitable for storing multiple terabytes of data in a
 single database.

-Start with example usage here: https://github.com/facebook/rocksdb/tree/main/examples
+Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples

 See the [github wiki](https://github.com/facebook/rocksdb/wiki) for more explanation.

@@ -26,9 +26,6 @@ Learn more about those use cases in a Tech Talk by Ankit Gupta and Naveen Somasu
 ## Yahoo
 Yahoo is using RocksDB as a storage engine for their biggest distributed data store Sherpa. Learn more about it here: http://yahooeng.tumblr.com/post/120730204806/sherpa-scales-new-heights

-## Baidu
-[Apache Doris](http://doris.apache.org/master/en/) is a MPP analytical database engine released by Baidu. It [uses RocksDB](http://doris.apache.org/master/en/administrator-guide/operation/tablet-meta-tool.html) to manage its tablet's metadata.
-
 ## CockroachDB
 CockroachDB is an open-source geo-replicated transactional database. They are using RocksDB as their storage engine. Check out their github: https://github.com/cockroachdb/cockroach

@@ -47,7 +44,7 @@ Tango is using RocksDB as a graph storage to store all users' connection data an
 Turn is using RocksDB as a storage layer for their key/value store, serving at peak 2.4MM QPS out of different datacenters.
 Check out our RocksDB Protobuf merge operator at: https://github.com/vladb38/rocksdb_protobuf

-## Santander UK/Cloudera Profession Services
+## Santanader UK/Cloudera Profession Services
 Check out their blog post: http://blog.cloudera.com/blog/2015/08/inside-santanders-near-real-time-data-ingest-architecture/

 ## Airbnb
@@ -70,7 +67,7 @@ Pinterest's Object Retrieval System uses RocksDB for storage: https://www.youtub
 [VWO's](https://vwo.com/) Smart Code checker and URL helper uses RocksDB to store all the URLs where VWO's Smart Code is installed.

 ## quasardb
-[quasardb](https://www.quasardb.net) is a high-performance, distributed, transactional key-value database that integrates well with in-memory analytics engines such as Apache Spark.
+[quasardb](https://www.quasardb.net) is a high-performance, distributed, transactional key-value database that integrates well with in-memory analytics engines such as Apache Spark. 
 quasardb uses a heavily tuned RocksDB as its persistence layer.

 ## Netflix
@@ -89,7 +86,7 @@ quasardb uses a heavily tuned RocksDB as its persistence layer.
 [Uber](http://eng.uber.com/cherami/) uses RocksDB as a durable and scalable task queue.

 ## 360 Pika
-[360](http://www.360.cn/) [Pika](https://github.com/Qihoo360/pika) is a nosql compatible with redis. With the huge amount of data stored, redis may suffer for a capacity bottleneck, and pika was born for solving it. It has widely been used in many companies.
+[360](http://www.360.cn/) [Pika](https://github.com/Qihoo360/pika) is a nosql compatible with redis. With the huge amount of data stored, redis may suffer for a capacity bottleneck, and pika was born for solving it. It has widely been widely used in many company

 ## LzLabs
 LzLabs is using RocksDB as a storage engine in their multi-database distributed framework to store application configuration and user data.
@@ -99,28 +96,16 @@ LzLabs is using RocksDB as a storage engine in their multi-database distributed

 ## IOTA Foundation
 [IOTA Foundation](https://www.iota.org/) is using RocksDB in the [IOTA Reference Implementation (IRI)](https://github.com/iotaledger/iri) to store the local state of the Tangle. The Tangle is the first open-source distributed ledger powering the future of the Internet of Things.
-
+ 
 ## Avrio Project
 [Avrio Project](http://avrio-project.github.io/avrio.network/) is using RocksDB in [Avrio ](https://github.com/avrio-project/avrio) to store blocks, account balances and data and other blockchain-releated data. Avrio is a multiblockchain decentralized cryptocurrency empowering monetary transactions.
-
+ 
 ## Crux
 [Crux](https://github.com/juxt/crux) is a document database that uses RocksDB for local [EAV](https://en.wikipedia.org/wiki/Entity%E2%80%93attribute%E2%80%93value_model) index storage to enable point-in-time bitemporal Datalog queries. The "unbundled" architecture uses Kafka to provide horizontal scalability.

 ## Nebula Graph
+
 [Nebula Graph](https://github.com/vesoft-inc/nebula) is a distributed, scalable, lightning-fast, open source graph database capable of hosting super large scale graphs with dozens of billions of vertices (nodes) and trillions of edges, with milliseconds of latency.

 ## YugabyteDB
 [YugabyteDB](https://www.yugabyte.com/) is an open source, high performance, distributed SQL database that uses RocksDB as its storage layer. For more information, please see https://github.com/yugabyte/yugabyte-db/.
-
-## ArangoDB
-[ArangoDB](https://www.arangodb.com/) is a native multi-model database with flexible data models for documents, graphs, and key-values, for building high performance applications using a convenient SQL-like query language or JavaScript extensions. It uses RocksDB as its storage engine.
-
-## Milvus
-[Milvus](https://milvus.io/) is an open source vector database for unstructured data. It uses RocksDB not only as one of the supported kv storage engines, but also as a message queue.
-
-## Kafka
-[Kafka](https://kafka.apache.org/) is an open-source distributed event streaming platform, it uses RocksDB to store state in Kafka Streams: https://www.confluent.io/blog/how-to-tune-rocksdb-kafka-streams-state-stores-performance/.
-
-## Others
-More databases using RocksDB can be found at [dbdb.io](https://dbdb.io/browse?embeds=rocksdb).
-
@@ -24,7 +24,7 @@ We strive to achieve the following goals:
 * make all unit test pass both in debug and release builds. 
  * Note: latest introduction of SyncPoint seems to disable running db_test in Release.
 * make performance on par with published benchmarks accounting for HW differences
-* we would like to keep the port code inline with the main branch with no forking
+* we would like to keep the port code inline with the master branch with no forking

 ## Build system
 We have chosen CMake as a widely accepted build system to build the Windows port. It is very fast and convenient. 
@@ -66,7 +66,7 @@ We endeavored to make it functionally on par with posix_env. This means we repli
 Even though Windows provides its own efficient thread-pool implementation we chose to replicate posix logic using `std::thread` primitives. This allows anyone to quickly detect any changes within the posix source code and replicate them within windows env. This has proven to work very well. At the same time for anyone who wishes to replace the built-in thread-pool can do so using RocksDB stackable environments.

 For disk access we implemented all of the functionality present within the posix_env which includes memory mapped files, random access, rate-limiter support etc.
-The `use_os_buffer` flag on Posix platforms currently denotes disabling read-ahead log via `fadvise` mechanism. Windows does not have `fadvise` system call. What is more, it implements disk cache in a way that differs from Linux greatly. It's not an uncommon practice on Windows to perform un-buffered disk access to gain control of the memory consumption. We think that in our use case this may also be a good configuration option at the expense of disk throughput. To compensate one may increase the configured in-memory cache size instead. Thus we have chosen  `use_os_buffer=false` to disable OS disk buffering for `WinWritableFile` and `WinRandomAccessFile`. The OS imposes restrictions on the alignment of the disk offsets, buffers used and the amount of data that is read/written when accessing files in un-buffered mode. When the option is true, the classes behave in a standard way. This allows to perform writes and reads in cases when un-buffered access does not make sense such as WAL and MANIFEST.
+The `use_os_buffer` flag on Posix platforms currently denotes disabling read-ahead log via `fadvise` mechanism. Windows does not have `fadvise` system call. What is more, it implements disk cache in a way that differs from Linux greatly. It’s not an uncommon practice on Windows to perform un-buffered disk access to gain control of the memory consumption. We think that in our use case this may also be a good configuration option at the expense of disk throughput. To compensate one may increase the configured in-memory cache size instead. Thus we have chosen  `use_os_buffer=false` to disable OS disk buffering for `WinWritableFile` and `WinRandomAccessFile`. The OS imposes restrictions on the alignment of the disk offsets, buffers used and the amount of data that is read/written when accessing files in un-buffered mode. When the option is true, the classes behave in a standard way. This allows to perform writes and reads in cases when un-buffered access does not make sense such as WAL and MANIFEST.

 We have replaced `pread/pwrite` with `WriteFile/ReadFile` with `OVERLAPPED` structure so we can atomically seek to the position of the disk operation but still perform the operation synchronously. Thus we able to emulate that functionality of `pread/pwrite` reasonably well. The only difference is that the file pointer is not returned to its original position but that hardly matters given the random nature of access.

@@ -24,10 +24,10 @@ from util import ColorString
 # (This generates a TARGET file without user-specified dependency for unit
 # tests.)
 # $python3 buckifier/buckify_rocksdb.py \
-#        '{"fake": {
-#                      "extra_deps": [":test_dep", "//fakes/module:mock1"],
-#                      "extra_compiler_flags": ["-DROCKSDB_LITE", "-Os"]
-#                  }
+#        '{"fake": { \
+#                      "extra_deps": [":test_dep", "//fakes/module:mock1"],  \
+#                      "extra_compiler_flags": ["-DROCKSDB_LITE", "-Os"], \
+#                  } \
 #         }'
 # (Generated TARGETS file has test_dep and mock1 as dependencies for RocksDB
 # unit tests, and will use the extra_compiler_flags to compile the unit test
@@ -69,25 +69,25 @@ def get_cc_files(repo_path):
    return cc_files


-# Get non_parallel tests from Makefile
-def get_non_parallel_tests(repo_path):
+# Get parallel tests from Makefile
+def get_parallel_tests(repo_path):
    Makefile = repo_path + "/Makefile"

    s = set({})

-    found_non_parallel_tests = False
+    found_parallel_tests = False
    for line in open(Makefile):
        line = line.strip()
-        if line.startswith("NON_PARALLEL_TEST ="):
-            found_non_parallel_tests = True
-        elif found_non_parallel_tests:
+        if line.startswith("PARALLEL_TEST ="):
+            found_parallel_tests = True
+        elif found_parallel_tests:
            if line.endswith("\\"):
                # remove the trailing \
                line = line[:-1]
                line = line.strip()
                s.add(line)
            else:
-                # we consumed all the non_parallel tests
+                # we consumed all the parallel tests
                break

    return s
@@ -123,33 +123,23 @@ def generate_targets(repo_path, deps_map):
    src_mk = parse_src_mk(repo_path)
    # get all .cc files
    cc_files = get_cc_files(repo_path)
-    # get non_parallel tests from Makefile
-    non_parallel_tests = get_non_parallel_tests(repo_path)
+    # get parallel tests from Makefile
+    parallel_tests = get_parallel_tests(repo_path)

-    if src_mk is None or cc_files is None or non_parallel_tests is None:
+    if src_mk is None or cc_files is None or parallel_tests is None:
        return False

-    extra_argv = ""
-    if len(sys.argv) >= 2:
-        # Heuristically quote and canonicalize whitespace for inclusion
-        # in how the file was generated.
-        extra_argv = " '{0}'".format(" ".join(sys.argv[1].split()))
-
-    TARGETS = TARGETSBuilder("%s/TARGETS" % repo_path, extra_argv)
+    TARGETS = TARGETSBuilder("%s/TARGETS" % repo_path)

    # rocksdb_lib
    TARGETS.add_library(
        "rocksdb_lib",
        src_mk["LIB_SOURCES"] +
-        # always add range_tree, it's only excluded on ppc64, which we don't use internally
-        src_mk["RANGE_TREE_SOURCES"] +
        src_mk["TOOL_LIB_SOURCES"])
    # rocksdb_whole_archive_lib
    TARGETS.add_library(
        "rocksdb_whole_archive_lib",
        src_mk["LIB_SOURCES"] +
-        # always add range_tree, it's only excluded on ppc64, which we don't use internally
-        src_mk["RANGE_TREE_SOURCES"] +
        src_mk["TOOL_LIB_SOURCES"],
        deps=None,
        headers=None,
@@ -173,11 +163,6 @@ def generate_targets(repo_path, deps_map):
        src_mk.get("ANALYZER_LIB_SOURCES", []) +
        ["test_util/testutil.cc"],
        [":rocksdb_lib"])
-    # rocksdb_cache_bench_tools_lib
-    TARGETS.add_library(
-        "rocksdb_cache_bench_tools_lib",
-        src_mk.get("CACHE_BENCH_LIB_SOURCES", []),
-        [":rocksdb_lib"])
    # rocksdb_stress_lib
    TARGETS.add_rocksdb_library(
        "rocksdb_stress_lib",
@@ -216,7 +201,7 @@ def generate_targets(repo_path, deps_map):
            TARGETS.register_test(
                test_target_name,
                test_src,
-                test not in non_parallel_tests,
+                test in parallel_tests,
                json.dumps(deps['extra_deps']),
                json.dumps(deps['extra_compiler_flags']))

@@ -25,11 +25,10 @@ def pretty_list(lst, indent=8):


 class TARGETSBuilder(object):
-    def __init__(self, path, extra_argv):
+    def __init__(self, path):
        self.path = path
        self.targets_file = open(path, 'wb')
-        header = targets_cfg.rocksdb_target_header_template.format(
-            extra_argv=extra_argv)
+        header = targets_cfg.rocksdb_target_header_template
        self.targets_file.write(header.encode("utf-8"))
        self.total_lib = 0
        self.total_bin = 0
@@ -80,25 +79,26 @@ class TARGETSBuilder(object):

    def add_c_test(self):
        self.targets_file.write(b"""
-cpp_binary(
-    name = "c_test_bin",
-    srcs = ["db/c_test.c"],
-    arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
-    compiler_flags = ROCKSDB_COMPILER_FLAGS,
-    include_paths = ROCKSDB_INCLUDE_PATHS,
-    os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
-    preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
-    deps = [":rocksdb_test_lib"],
-) if not is_opt_mode else None
+if not is_opt_mode:
+    cpp_binary(
+        name = "c_test_bin",
+        srcs = ["db/c_test.c"],
+        arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
+        os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
+        compiler_flags = ROCKSDB_COMPILER_FLAGS,
+        preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
+        deps = [":rocksdb_test_lib"],
+    )

-custom_unittest(
-    name = "c_test",
-    command = [
-        native.package_name() + "/buckifier/rocks_test_runner.sh",
-        "$(location :{})".format("c_test_bin"),
-    ],
-    type = "simple",
-) if not is_opt_mode else None
+if not is_opt_mode:
+    custom_unittest(
+        "c_test",
+        command = [
+            native.package_name() + "/buckifier/rocks_test_runner.sh",
+            "$(location :{})".format("c_test_bin"),
+        ],
+        type = "simple",
+    )
 """)

    def register_test(self,
@@ -5,8 +5,7 @@ from __future__ import print_function
 from __future__ import unicode_literals

 rocksdb_target_header_template = \
-    """# This file \100generated by:
-#$ python3 buckifier/buckify_rocksdb.py{extra_argv}
+    """# This file \100generated by `python3 buckifier/buckify_rocksdb.py`
 # --> DO NOT EDIT MANUALLY <--
 # This file is a Facebook-specific integration for buck builds, so can
 # only be validated by Facebook employees.
@@ -17,7 +16,7 @@ load(":defs.bzl", "test_binary")

 REPO_PATH = package_name() + "/"

-ROCKSDB_COMPILER_FLAGS_0 = [
+ROCKSDB_COMPILER_FLAGS = [
    "-fno-builtin-memcmp",
    # Needed to compile in fbcode
    "-Wno-expansion-to-defined",
@@ -32,17 +31,13 @@ ROCKSDB_EXTERNAL_DEPS = [
    ("zlib", None, "z"),
    ("gflags", None, "gflags"),
    ("lz4", None, "lz4"),
-    ("zstd", None, "zstd"),
+    ("zstd", None),
 ]

-ROCKSDB_OS_DEPS_0 = [
+ROCKSDB_OS_DEPS = [
    (
        "linux",
-        [
-            "third-party//numa:numa",
-            "third-party//liburing:uring",
-            "third-party//tbb:tbb",
-        ],
+        ["third-party//numa:numa", "third-party//liburing:uring", "third-party//tbb:tbb"],
    ),
    (
        "macos",
@@ -50,7 +45,7 @@ ROCKSDB_OS_DEPS_0 = [
    ),
 ]

-ROCKSDB_OS_PREPROCESSOR_FLAGS_0 = [
+ROCKSDB_OS_PREPROCESSOR_FLAGS = [
    (
        "linux",
        [
@@ -80,13 +75,7 @@ ROCKSDB_OS_PREPROCESSOR_FLAGS_0 = [
    ),
    (
        "windows",
-        [
-            "-DOS_WIN",
-            "-DWIN32",
-            "-D_MBCS",
-            "-DWIN64",
-            "-DNOMINMAX",
-        ],
+        [ "-DOS_WIN", "-DWIN32", "-D_MBCS", "-DWIN64", "-DNOMINMAX" ]
    ),
 ]

@@ -104,19 +93,17 @@ ROCKSDB_PREPROCESSOR_FLAGS = [

    # Added missing flags from output of build_detect_platform
    "-DROCKSDB_BACKTRACE",
+
+    # Directories with files for #include
+    "-I" + REPO_PATH + "include/",
+    "-I" + REPO_PATH,
 ]

-# Directories with files for #include
-ROCKSDB_INCLUDE_PATHS = [
-    "",
-    "include",
-]
-
-ROCKSDB_ARCH_PREPROCESSOR_FLAGS = {{
+ROCKSDB_ARCH_PREPROCESSOR_FLAGS = {
    "x86_64": [
        "-DHAVE_PCLMUL",
    ],
-}}
+}

 build_mode = read_config("fbcode", "build_mode")

@@ -124,18 +111,18 @@ is_opt_mode = build_mode.startswith("opt")

 # -DNDEBUG is added by default in opt mode in fbcode. But adding it twice
 # doesn't harm and avoid forgetting to add it.
-ROCKSDB_COMPILER_FLAGS = ROCKSDB_COMPILER_FLAGS_0 + (["-DNDEBUG"] if is_opt_mode else [])
+ROCKSDB_COMPILER_FLAGS += (["-DNDEBUG"] if is_opt_mode else [])

 sanitizer = read_config("fbcode", "sanitizer")

 # Do not enable jemalloc if sanitizer presents. RocksDB will further detect
 # whether the binary is linked with jemalloc at runtime.
-ROCKSDB_OS_PREPROCESSOR_FLAGS = ROCKSDB_OS_PREPROCESSOR_FLAGS_0 + ([(
+ROCKSDB_OS_PREPROCESSOR_FLAGS += ([(
    "linux",
    ["-DROCKSDB_JEMALLOC"],
 )] if sanitizer == "" else [])

-ROCKSDB_OS_DEPS = ROCKSDB_OS_DEPS_0 + ([(
+ROCKSDB_OS_DEPS += ([(
    "linux",
    ["third-party//jemalloc:headers"],
 )] if sanitizer == "" else [])
@@ -154,14 +141,12 @@ cpp_library(
    {headers_attr_prefix}headers = {headers},
    arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
    compiler_flags = ROCKSDB_COMPILER_FLAGS,
-    include_paths = ROCKSDB_INCLUDE_PATHS,
-    link_whole = {link_whole},
    os_deps = ROCKSDB_OS_DEPS,
    os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
    preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
-    unexported_deps_by_default = False,
    deps = [{deps}],
    external_deps = ROCKSDB_EXTERNAL_DEPS{extra_external_deps},
+    link_whole = {link_whole},
 )
 """

@@ -172,11 +157,9 @@ cpp_library(
    {headers_attr_prefix}headers = {headers},
    arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
    compiler_flags = ROCKSDB_COMPILER_FLAGS,
-    include_paths = ROCKSDB_INCLUDE_PATHS,
    os_deps = ROCKSDB_OS_DEPS,
    os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
    preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
-    unexported_deps_by_default = False,
    deps = ROCKSDB_LIB_DEPS,
    external_deps = ROCKSDB_EXTERNAL_DEPS,
 )
@@ -189,7 +172,6 @@ cpp_binary(
    arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
    compiler_flags = ROCKSDB_COMPILER_FLAGS,
    preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
-    include_paths = ROCKSDB_INCLUDE_PATHS,
    deps = [{deps}],
    external_deps = ROCKSDB_EXTERNAL_DEPS,
 )
@@ -217,9 +199,8 @@ ROCKS_TESTS = [
        name = test_name,
        srcs = [test_cc],
        arch_preprocessor_flags = ROCKSDB_ARCH_PREPROCESSOR_FLAGS,
-        compiler_flags = ROCKSDB_COMPILER_FLAGS + extra_compiler_flags,
-        include_paths = ROCKSDB_INCLUDE_PATHS,
        os_preprocessor_flags = ROCKSDB_OS_PREPROCESSOR_FLAGS,
+        compiler_flags = ROCKSDB_COMPILER_FLAGS + extra_compiler_flags,
        preprocessor_flags = ROCKSDB_PREPROCESSOR_FLAGS,
        deps = [":rocksdb_test_lib"] + extra_deps,
        external_deps = ROCKSDB_EXTERNAL_DEPS + [
@@ -45,13 +45,8 @@ if test -z "$OUTPUT"; then
  exit 1
 fi

-# we depend on C++11, but should be compatible with newer standards
-if [ "$ROCKSDB_CXX_STANDARD" ]; then
-  PLATFORM_CXXFLAGS="-std=$ROCKSDB_CXX_STANDARD"
-else
-  PLATFORM_CXXFLAGS="-std=c++11"
-fi
-
+# we depend on C++11
+PLATFORM_CXXFLAGS="-std=c++11"
 # we currently depend on POSIX platform
 COMMON_FLAGS="-DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX"

@@ -69,6 +64,10 @@ if [ -z "$ROCKSDB_NO_FBCODE" -a -d /mnt/gvfs/third-party ]; then
      source "$PWD/build_tools/fbcode_config_platform007.sh"
    elif [ -n "$ROCKSDB_FBCODE_BUILD_WITH_PLATFORM009" ]; then
      source "$PWD/build_tools/fbcode_config_platform009.sh"
+    elif [ -z "$USE_CLANG" ]; then
+        # Still use platform007 for gcc by default for build break on
+        # some hosts.
+      source "$PWD/build_tools/fbcode_config_platform007.sh"
    else
      source "$PWD/build_tools/fbcode_config_platform009.sh"
    fi
@@ -171,12 +170,9 @@ case "$TARGET_OS" in
            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -latomic"
        fi
        PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lpthread -lrt -ldl"
-        if test -z "$ROCKSDB_USE_IO_URING"; then
-            ROCKSDB_USE_IO_URING=1
-        fi
-        if test "$ROCKSDB_USE_IO_URING" -ne 0; then
+        if test $ROCKSDB_USE_IO_URING; then
            # check for liburing
-            $CXX $PLATFORM_CXXFLAGS -x c++ - -luring -o /dev/null 2>/dev/null  <<EOF
+            $CXX $CFLAGS -x c++ - -luring -o /dev/null 2>/dev/null  <<EOF
              #include <liburing.h>
              int main() {
                struct io_uring ring;
@@ -189,6 +185,9 @@ EOF
                COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_IOURING_PRESENT"
            fi
        fi
+        if test -z "$USE_FOLLY_DISTRIBUTED_MUTEX"; then
+          USE_FOLLY_DISTRIBUTED_MUTEX=1
+        fi
        # PORT_FILES=port/linux/linux_specific.cc
        ;;
    SunOS)
@@ -284,7 +283,7 @@ if [ "$CROSS_COMPILE" = "true" -o "$FBCODE_BUILD" = "true" ]; then
 else
    if ! test $ROCKSDB_DISABLE_FALLOCATE; then
        # Test whether fallocate is available
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <fcntl.h>
          #include <linux/falloc.h>
          int main() {
@@ -300,7 +299,7 @@ EOF
    if ! test $ROCKSDB_DISABLE_SNAPPY; then
        # Test whether Snappy library is installed
        # http://code.google.com/p/snappy/
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <snappy.h>
          int main() {}
 EOF
@@ -315,7 +314,7 @@ EOF
        # Test whether gflags library is installed
        # http://gflags.github.io/gflags/
        # check if the namespace is gflags
-        if $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
+        if $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
          #include <gflags/gflags.h>
          using namespace GFLAGS_NAMESPACE;
          int main() {}
@@ -324,7 +323,7 @@ EOF
          COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=1"
          PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
        # check if namespace is gflags
-        elif $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
+        elif $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
            #include <gflags/gflags.h>
            using namespace gflags;
            int main() {}
@@ -333,7 +332,7 @@ EOF
          COMMON_FLAGS="$COMMON_FLAGS -DGFLAGS=1 -DGFLAGS_NAMESPACE=gflags"
          PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lgflags"
        # check if namespace is google
-        elif $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
+        elif $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null << EOF
            #include <gflags/gflags.h>
            using namespace google;
            int main() {}
@@ -346,7 +345,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_ZLIB; then
        # Test whether zlib library is installed
-        $CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <zlib.h>
          int main() {}
 EOF
@@ -359,7 +358,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_BZIP; then
        # Test whether bzip library is installed
-        $CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <bzlib.h>
          int main() {}
 EOF
@@ -372,7 +371,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_LZ4; then
        # Test whether lz4 library is installed
-        $CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <lz4.h>
          #include <lz4hc.h>
          int main() {}
@@ -386,7 +385,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_ZSTD; then
        # Test whether zstd library is installed
-        $CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS $COMMON_FLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <zstd.h>
          int main() {}
 EOF
@@ -399,7 +398,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_NUMA; then
        # Test whether numa is available
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null -lnuma 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null -lnuma 2>/dev/null  <<EOF
          #include <numa.h>
          #include <numaif.h>
          int main() {}
@@ -413,7 +412,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_TBB; then
        # Test whether tbb is available
-        $CXX $PLATFORM_CXXFLAGS $LDFLAGS -x c++ - -o /dev/null -ltbb 2>/dev/null  <<EOF
+        $CXX $CFLAGS $LDFLAGS -x c++ - -o /dev/null -ltbb 2>/dev/null  <<EOF
          #include <tbb/tbb.h>
          int main() {}
 EOF
@@ -426,7 +425,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_JEMALLOC; then
        # Test whether jemalloc is available
-        if echo 'int main() {}' | $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null -ljemalloc \
+        if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null -ljemalloc \
          2>/dev/null; then
            # This will enable some preprocessor identifiers in the Makefile
            JEMALLOC=1
@@ -447,7 +446,7 @@ EOF
    fi
    if ! test $JEMALLOC && ! test $ROCKSDB_DISABLE_TCMALLOC; then
        # jemalloc is not available. Let's try tcmalloc
-        if echo 'int main() {}' | $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null \
+        if echo 'int main() {}' | $CXX $CFLAGS -x c++ - -o /dev/null \
          -ltcmalloc 2>/dev/null; then
            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -ltcmalloc"
            JAVA_LDFLAGS="$JAVA_LDFLAGS -ltcmalloc"
@@ -456,7 +455,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_MALLOC_USABLE_SIZE; then
        # Test whether malloc_usable_size is available
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <malloc.h>
          int main() {
            size_t res = malloc_usable_size(0);
@@ -471,7 +470,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_MEMKIND; then
        # Test whether memkind library is installed
-        $CXX $PLATFORM_CXXFLAGS $COMMON_FLAGS -lmemkind -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS $COMMON_FLAGS -lmemkind -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <memkind.h>
          int main() {
            memkind_malloc(MEMKIND_DAX_KMEM, 1024);
@@ -487,7 +486,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_PTHREAD_MUTEX_ADAPTIVE_NP; then
        # Test whether PTHREAD_MUTEX_ADAPTIVE_NP mutex type is available
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <pthread.h>
          int main() {
            int x = PTHREAD_MUTEX_ADAPTIVE_NP;
@@ -502,7 +501,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_BACKTRACE; then
        # Test whether backtrace is available
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <execinfo.h>
          int main() {
            void* frames[1];
@@ -514,7 +513,7 @@ EOF
            COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_BACKTRACE"
        else
            # Test whether execinfo library is installed
-            $CXX $PLATFORM_CXXFLAGS -lexecinfo -x c++ - -o /dev/null 2>/dev/null  <<EOF
+            $CXX $CFLAGS -lexecinfo -x c++ - -o /dev/null 2>/dev/null  <<EOF
              #include <execinfo.h>
              int main() {
                void* frames[1];
@@ -531,7 +530,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_PG; then
        # Test if -pg is supported
-        $CXX $PLATFORM_CXXFLAGS -pg -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -pg -x c++ - -o /dev/null 2>/dev/null  <<EOF
          int main() {
            return 0;
          }
@@ -543,7 +542,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_SYNC_FILE_RANGE; then
        # Test whether sync_file_range is supported for compatibility with an old glibc
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <fcntl.h>
          int main() {
            int fd = open("/dev/null", 0);
@@ -557,7 +556,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_SCHED_GETCPU; then
        # Test whether sched_getcpu is supported
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <sched.h>
          int main() {
            int cpuid = sched_getcpu();
@@ -571,7 +570,7 @@ EOF

    if ! test $ROCKSDB_DISABLE_AUXV_GETAUXVAL; then
        # Test whether getauxval is supported
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
+        $CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null  <<EOF
          #include <sys/auxv.h>
          int main() {
            uint64_t auxv = getauxval(AT_HWCAP);
@@ -593,23 +592,13 @@ EOF
            PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS -faligned-new -DHAVE_ALIGNED_NEW"
        fi
    fi
-    if ! test $ROCKSDB_DISABLE_BENCHMARK; then
-        # Test whether google benchmark is available
-        $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null -lbenchmark 2>/dev/null  <<EOF
-          #include <benchmark/benchmark.h>
-          int main() {}
-EOF
-        if [ "$?" = 0 ]; then
-            PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -lbenchmark"
-        fi
-    fi
 fi

 # TODO(tec): Fix -Wshorten-64-to-32 errors on FreeBSD and enable the warning.
-# -Wshorten-64-to-32 breaks compilation on FreeBSD aarch64 and i386
-if ! { [ "$TARGET_OS" = FreeBSD ] && [ "$TARGET_ARCHITECTURE" = arm64 -o "$TARGET_ARCHITECTURE" = i386 ]; }; then
+# -Wshorten-64-to-32 breaks compilation on FreeBSD i386
+if ! [ "$TARGET_OS" = FreeBSD -a "$TARGET_ARCHITECTURE" = i386 ]; then
  # Test whether -Wshorten-64-to-32 is available
-  $CXX $PLATFORM_CXXFLAGS -x c++ - -o /dev/null -Wshorten-64-to-32 2>/dev/null  <<EOF
+  $CXX $CFLAGS -x c++ - -o /dev/null -Wshorten-64-to-32 2>/dev/null  <<EOF
    int main() {}
 EOF
  if [ "$?" = 0 ]; then
@@ -638,19 +627,13 @@ if test "0$PORTABLE" -eq 0; then
    # Tune for this POWER processor, treating '+' models as base models
    POWER=`LD_SHOW_AUXV=1 /bin/true | grep AT_PLATFORM | grep -E -o power[0-9]+`
    COMMON_FLAGS="$COMMON_FLAGS -mcpu=$POWER -mtune=$POWER "
+  elif test -n "`echo $TARGET_ARCHITECTURE | grep ^s390x`"; then
+    COMMON_FLAGS="$COMMON_FLAGS -march=z10 "
  elif test -n "`echo $TARGET_ARCHITECTURE | grep -e^arm -e^aarch64`"; then
    # TODO: Handle this with approprite options.
    COMMON_FLAGS="$COMMON_FLAGS"
  elif test -n "`echo $TARGET_ARCHITECTURE | grep ^aarch64`"; then
    COMMON_FLAGS="$COMMON_FLAGS"
-  elif test -n "`echo $TARGET_ARCHITECTURE | grep ^s390x`"; then
-    if echo 'int main() {}' | $CXX $PLATFORM_CXXFLAGS -x c++ \
-      -fsyntax-only -march=native - -o /dev/null 2>/dev/null; then
-      COMMON_FLAGS="$COMMON_FLAGS -march=native "
-    else
-      COMMON_FLAGS="$COMMON_FLAGS -march=z196 "
-    fi
-    COMMON_FLAGS="$COMMON_FLAGS"
  elif [ "$TARGET_OS" == "IOS" ]; then
    COMMON_FLAGS="$COMMON_FLAGS"
  elif [ "$TARGET_OS" == "AIX" ] || [ "$TARGET_OS" == "SunOS" ]; then
@@ -667,38 +650,11 @@ else
    TRY_SSE_ETC="1"
  fi

-  if test -n "`echo $TARGET_ARCHITECTURE | grep ^s390x`"; then
-    COMMON_FLAGS="$COMMON_FLAGS -march=z196 "
-  fi
-
  if [[ "${PLATFORM}" == "OS_MACOSX" ]]; then
    # For portability compile for macOS 10.12 (2016) or newer
    COMMON_FLAGS="$COMMON_FLAGS -mmacosx-version-min=10.12"
    PLATFORM_LDFLAGS="$PLATFORM_LDFLAGS -mmacosx-version-min=10.12"
-    # -mmacosx-version-min must come first here.
-    PLATFORM_SHARED_LDFLAGS="-mmacosx-version-min=10.12 $PLATFORM_SHARED_LDFLAGS"
-    PLATFORM_CMAKE_FLAGS="-DCMAKE_OSX_DEPLOYMENT_TARGET=10.12"
-    JAVA_STATIC_DEPS_COMMON_FLAGS="-mmacosx-version-min=10.12"
-    JAVA_STATIC_DEPS_LDFLAGS="$JAVA_STATIC_DEPS_COMMON_FLAGS"
-    JAVA_STATIC_DEPS_CCFLAGS="$JAVA_STATIC_DEPS_COMMON_FLAGS"
-    JAVA_STATIC_DEPS_CXXFLAGS="$JAVA_STATIC_DEPS_COMMON_FLAGS"
-  fi
-fi
-
-if test -n "`echo $TARGET_ARCHITECTURE | grep ^ppc64`"; then
-  # check for GNU libc on ppc64
-  $CXX -x c++ - -o /dev/null 2>/dev/null <<EOF
-    #include <stdio.h>
-    #include <stdlib.h>
-    #include <gnu/libc-version.h>
-
-    int main(int argc, char *argv[]) {
-      printf("GNU libc version: %s\n", gnu_get_libc_version());
-      return 0;
-    }
-EOF
-  if [ "$?" != 0 ]; then
-      PPC_LIBC_IS_GNU=0
+    PLATFORM_SHARED_LDFLAGS="$PLATFORM_SHARED_LDFLAGS -mmacosx-version-min=10.12"
  fi
 fi

@@ -856,12 +812,8 @@ echo "CXX=$CXX" >> "$OUTPUT"
 echo "AR=$AR" >> "$OUTPUT"
 echo "PLATFORM=$PLATFORM" >> "$OUTPUT"
 echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> "$OUTPUT"
-echo "PLATFORM_CMAKE_FLAGS=$PLATFORM_CMAKE_FLAGS" >> "$OUTPUT"
 echo "JAVA_LDFLAGS=$JAVA_LDFLAGS" >> "$OUTPUT"
 echo "JAVA_STATIC_LDFLAGS=$JAVA_STATIC_LDFLAGS" >> "$OUTPUT"
-echo "JAVA_STATIC_DEPS_CCFLAGS=$JAVA_STATIC_DEPS_CCFLAGS" >> "$OUTPUT"
-echo "JAVA_STATIC_DEPS_CXXFLAGS=$JAVA_STATIC_DEPS_CXXFLAGS" >> "$OUTPUT"
-echo "JAVA_STATIC_DEPS_LDFLAGS=$JAVA_STATIC_DEPS_LDFLAGS" >> "$OUTPUT"
 echo "JAVAC_ARGS=$JAVAC_ARGS" >> "$OUTPUT"
 echo "VALGRIND_VER=$VALGRIND_VER" >> "$OUTPUT"
 echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> "$OUTPUT"
@@ -895,6 +847,3 @@ echo "LUA_PATH=$LUA_PATH" >> "$OUTPUT"
 if test -n "$USE_FOLLY_DISTRIBUTED_MUTEX"; then
  echo "USE_FOLLY_DISTRIBUTED_MUTEX=$USE_FOLLY_DISTRIBUTED_MUTEX" >> "$OUTPUT"
 fi
-if test -n "$PPC_LIBC_IS_GNU"; then
-  echo "PPC_LIBC_IS_GNU=$PPC_LIBC_IS_GNU" >> "$OUTPUT"
-fi
@@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
-#
-# Check for some simple mistakes that should prevent commit or push
-
-BAD=""
-
-git grep 'namespace rocksdb' -- '*.[ch]*'
-if [ "$?" != "1" ]; then
-  echo "^^^^^ Do not hardcode namespace rocksdb. Use ROCKSDB_NAMESPACE"
-  BAD=1
-fi
-
-git grep -i 'nocommit' -- ':!build_tools/check-sources.sh'
-if [ "$?" != "1" ]; then
-  echo "^^^^^ Code was not intended to be committed"
-  BAD=1
-fi
-
-git grep '<rocksdb/' -- ':!build_tools/check-sources.sh'
-if [ "$?" != "1" ]; then
-  echo '^^^^^ Use double-quotes as in #include "rocksdb/something.h"'
-  BAD=1
-fi
-
-if [ "$BAD" ]; then
-  exit 1
-fi
@@ -18,4 +18,3 @@ KERNEL_HEADERS_BASE=/mnt/gvfs/third-party2/kernel-headers/32b8a2407b634df3f8f948
 BINUTILS_BASE=/mnt/gvfs/third-party2/binutils/08634589372fa5f237bfd374e8c644a8364e78c1/2.32/platform009/ba86d1f/
 VALGRIND_BASE=/mnt/gvfs/third-party2/valgrind/6ae525939ad02e5e676855082fbbc7828dbafeac/3.15.0/platform009/7f3b187
 LUA_BASE=/mnt/gvfs/third-party2/lua/162efd9561a3d21f6869f4814011e9cf1b3ff4dc/5.3.4/platform009/a6271c4
-BENCHMARK_BASE=/mnt/gvfs/third-party2/benchmark/bce8d9564eaf161700aa3a20b1051564acf555fb/1.5.5/platform009/7f3b187
@@ -167,4 +167,6 @@ VALGRIND_VER="$VALGRIND_BASE/bin/"
 LUA_PATH=
 LUA_LIB=

+USE_FOLLY_DISTRIBUTED_MUTEX=1
+
 export CC CXX AR CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE CLANG_ANALYZER CLANG_SCAN_BUILD LUA_PATH LUA_LIB
@@ -63,13 +63,6 @@ else
 fi
 CFLAGS+=" -DGFLAGS=gflags"

-BENCHMARK_INCLUDE=" -I $BENCHMARK_BASE/include/"
-if test -z $PIC_BUILD; then
-  BENCHMARK_LIBS=" $BENCHMARK_BASE/lib/libbenchmark.a"
-else
-  BENCHMARK_LIBS=" $BENCHMARK_BASE/lib/libbenchmark_pic.a"
-fi
-
 # location of jemalloc
 JEMALLOC_INCLUDE=" -I $JEMALLOC_BASE/include/"
 JEMALLOC_LIB=" $JEMALLOC_BASE/lib/libjemalloc.a"
@@ -109,9 +102,8 @@ export PORTABLE

 BINUTILS="$BINUTILS_BASE/bin"
 AR="$BINUTILS/ar"
-AS="$BINUTILS/as"

-DEPS_INCLUDE="$SNAPPY_INCLUDE $ZLIB_INCLUDE $BZIP_INCLUDE $LZ4_INCLUDE $ZSTD_INCLUDE $GFLAGS_INCLUDE $NUMA_INCLUDE $TBB_INCLUDE $LIBURING_INCLUDE $BENCHMARK_INCLUDE"
+DEPS_INCLUDE="$SNAPPY_INCLUDE $ZLIB_INCLUDE $BZIP_INCLUDE $LZ4_INCLUDE $ZSTD_INCLUDE $GFLAGS_INCLUDE $NUMA_INCLUDE $TBB_INCLUDE $LIBURING_INCLUDE"

 STDLIBS="-L $GCC_BASE/lib64"

@@ -128,7 +120,7 @@ if [ -z "$USE_CLANG" ]; then
  CXX="$GCC_BASE/bin/g++"
  AR="$GCC_BASE/bin/gcc-ar"

-  CFLAGS+=" -B$BINUTILS"
+  CFLAGS+=" -B$BINUTILS/gold"
  CFLAGS+=" -isystem $LIBGCC_INCLUDE"
  CFLAGS+=" -isystem $GLIBC_INCLUDE"
  JEMALLOC=1
@@ -141,7 +133,7 @@ else

  KERNEL_HEADERS_INCLUDE="$KERNEL_HEADERS_BASE/include"

-  CFLAGS+=" -B$BINUTILS -nostdinc -nostdlib"
+  CFLAGS+=" -B$BINUTILS/gold -nostdinc -nostdlib"
  CFLAGS+=" -isystem $LIBGCC_BASE/include/c++/9.x "
  CFLAGS+=" -isystem $LIBGCC_BASE/include/c++/9.x/x86_64-facebook-linux "
  CFLAGS+=" -isystem $GLIBC_INCLUDE"
@@ -157,18 +149,17 @@ CFLAGS+=" $DEPS_INCLUDE"
 CFLAGS+=" -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX -DROCKSDB_FALLOCATE_PRESENT -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_SUPPORT_THREAD_LOCAL -DHAVE_SSE42 -DROCKSDB_IOURING_PRESENT"
 CXXFLAGS+=" $CFLAGS"

-EXEC_LDFLAGS=" $SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $ZSTD_LIBS $GFLAGS_LIBS $NUMA_LIB $TBB_LIBS $LIBURING_LIBS $BENCHMARK_LIBS"
+EXEC_LDFLAGS=" $SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $ZSTD_LIBS $GFLAGS_LIBS $NUMA_LIB $TBB_LIBS $LIBURING_LIBS"
+EXEC_LDFLAGS+=" -B$BINUTILS/gold"
 EXEC_LDFLAGS+=" -Wl,--dynamic-linker,/usr/local/fbcode/platform009/lib/ld.so"
 EXEC_LDFLAGS+=" $LIBUNWIND"
 EXEC_LDFLAGS+=" -Wl,-rpath=/usr/local/fbcode/platform009/lib"
-EXEC_LDFLAGS+=" -Wl,-rpath=$GCC_BASE/lib64"
 # required by libtbb
 EXEC_LDFLAGS+=" -ldl"

 PLATFORM_LDFLAGS="$LIBGCC_LIBS $GLIBC_LIBS $STDLIBS -lgcc -lstdc++"
-PLATFORM_LDFLAGS+=" -B$BINUTILS"

-EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $ZSTD_LIBS $GFLAGS_LIBS $TBB_LIBS $LIBURING_LIBS $BENCHMARK_LIBS"
+EXEC_LDFLAGS_SHARED="$SNAPPY_LIBS $ZLIB_LIBS $BZIP_LIBS $LZ4_LIBS $ZSTD_LIBS $GFLAGS_LIBS $TBB_LIBS $LIBURING_LIBS"

 VALGRIND_VER="$VALGRIND_BASE/bin/"

@@ -176,4 +167,6 @@ VALGRIND_VER="$VALGRIND_BASE/bin/"
 LUA_PATH=
 LUA_LIB=

-export CC CXX AR AS CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE CLANG_ANALYZER CLANG_SCAN_BUILD LUA_PATH LUA_LIB
+USE_FOLLY_DISTRIBUTED_MUTEX=1
+
+export CC CXX AR CFLAGS CXXFLAGS EXEC_LDFLAGS EXEC_LDFLAGS_SHARED VALGRIND_VER JEMALLOC_LIB JEMALLOC_INCLUDE CLANG_ANALYZER CLANG_SCAN_BUILD LUA_PATH LUA_LIB
@@ -38,9 +38,7 @@ if [ "$CLANG_FORMAT_DIFF" ]; then
  fi
 else
  # First try directly executing the possibilities
-  if clang-format-diff --help &> /dev/null < /dev/null; then
-    CLANG_FORMAT_DIFF=clang-format-diff
-  elif clang-format-diff.py --help &> /dev/null < /dev/null; then
+  if clang-format-diff.py --help &> /dev/null < /dev/null; then
    CLANG_FORMAT_DIFF=clang-format-diff.py
  elif $REPO_ROOT/clang-format-diff.py --help &> /dev/null < /dev/null; then
    CLANG_FORMAT_DIFF=$REPO_ROOT/clang-format-diff.py
@@ -54,16 +52,15 @@ else
    else
      echo "You didn't have clang-format-diff.py and/or clang-format available in your computer!"
      echo "You can download clang-format-diff.py by running: "
-      echo "    curl --location https://raw.githubusercontent.com/llvm/llvm-project/main/clang/tools/clang-format/clang-format-diff.py -o ${REPO_ROOT}/clang-format-diff.py"
-      echo "You should make sure the downloaded script is not compromised."
+      echo "    curl --location http://goo.gl/iUW1u2 -o ${CLANG_FORMAT_DIFF}"
      echo "You can download clang-format by running:"
      echo "    brew install clang-format"
      echo "  Or"
      echo "    apt install clang-format"
      echo "  This might work too:"
      echo "    yum install git-clang-format"
-      echo "Then make sure clang-format is available and executable from \$PATH:"
-      echo "    clang-format --version"
+      echo "Then, move both files (i.e. ${CLANG_FORMAT_DIFF} and clang-format) to some directory within PATH=${PATH}"
+      echo "and make sure ${CLANG_FORMAT_DIFF} is executable."
      exit 128
    fi
    # Check argparse pre-req on interpreter, or it will fail
@@ -78,16 +75,17 @@ else
      exit 129
    fi
    # Unfortunately, some machines have a Python2 clang-format-diff.py
-    # installed but only a Python3 interpreter installed. Unfortunately,
-    # automatic 2to3 migration is insufficient, so suggest downloading latest.
+    # installed but only a Python3 interpreter installed. Rather than trying
+    # different Python versions that might be installed, we can try migrating
+    # the code to Python3 if it looks like Python2
    if grep -q "print '" "$CFD_PATH" && \
       ${PYTHON:-python3} --version | grep -q 'ython 3'; then
-      echo "You have clang-format-diff.py for Python 2 but are using a Python 3"
-      echo "interpreter (${PYTHON:-python3})."
-      echo "You can download clang-format-diff.py for Python 3 by running: "
-      echo "    curl --location https://raw.githubusercontent.com/llvm/llvm-project/main/clang/tools/clang-format/clang-format-diff.py -o ${REPO_ROOT}/clang-format-diff.py"
-      echo "You should make sure the downloaded script is not compromised."
-      exit 130
+      if [ ! -f "$REPO_ROOT/.py3/clang-format-diff.py" ]; then
+        echo "Migrating $CFD_PATH to Python3 in a hidden file"
+        mkdir -p "$REPO_ROOT/.py3"
+        ${PYTHON:-python3} -m lib2to3 -w -n -o "$REPO_ROOT/.py3" "$CFD_PATH" > /dev/null || exit 128
+      fi
+      CFD_PATH="$REPO_ROOT/.py3/clang-format-diff.py"
    fi
    CLANG_FORMAT_DIFF="${PYTHON:-python3} $CFD_PATH"
    # This had better work after all those checks
@@ -122,27 +120,25 @@ uncommitted_code=`git diff HEAD`

 # If there's no uncommitted changes, we assume user are doing post-commit
 # format check, in which case we'll try to check the modified lines vs. the
-# facebook/rocksdb.git main branch. Otherwise, we'll check format of the
+# facebook/rocksdb.git master branch. Otherwise, we'll check format of the
 # uncommitted code only.
 if [ -z "$uncommitted_code" ]
 then
  # Attempt to get name of facebook/rocksdb.git remote.
-  [ "$FORMAT_REMOTE" ] || FORMAT_REMOTE="$(LC_ALL=POSIX LANG=POSIX git remote -v | grep 'facebook/rocksdb.git' | head -n 1 | cut -f 1)"
+  [ "$FORMAT_REMOTE" ] || FORMAT_REMOTE="$(git remote -v | grep 'facebook/rocksdb.git' | head -n 1 | cut -f 1)"
  # Fall back on 'origin' if that fails
  [ "$FORMAT_REMOTE" ] || FORMAT_REMOTE=origin
-  # Use main branch from that remote
-  [ "$FORMAT_UPSTREAM" ] || FORMAT_UPSTREAM="$FORMAT_REMOTE/$(LC_ALL=POSIX LANG=POSIX git remote show $FORMAT_REMOTE | sed -n '/HEAD branch/s/.*: //p')"
+  # Use master branch from that remote
+  [ "$FORMAT_UPSTREAM" ] || FORMAT_UPSTREAM="$FORMAT_REMOTE/master"
  # Get the common ancestor with that remote branch. Everything after that
  # common ancestor would be considered the contents of a pull request, so
  # should be relevant for formatting fixes.
  FORMAT_UPSTREAM_MERGE_BASE="$(git merge-base "$FORMAT_UPSTREAM" HEAD)"
  # Get the differences
  diffs=$(git diff -U0 "$FORMAT_UPSTREAM_MERGE_BASE" | $CLANG_FORMAT_DIFF -p 1)
-  echo "Checking format of changes not yet in $FORMAT_UPSTREAM..."
 else
  # Check the format of uncommitted lines,
  diffs=$(git diff -U0 HEAD | $CLANG_FORMAT_DIFF -p 1)
-  echo "Checking format of uncommitted changes..."
 fi

 if [ -z "$diffs" ]
@@ -1561,7 +1561,6 @@ sub save_stdin_stdout_stderr {
 	::die_bug("Can't dup STDERR: $!");
    open $Global::original_stdin, "<&", "STDIN" or
 	::die_bug("Can't dup STDIN: $!");
-    $Global::is_terminal = (-t $Global::original_stderr);
 }

 sub enough_file_handles {
@@ -1841,17 +1840,12 @@ sub start_another_job {
 }
 }

-$opt::min_progress_interval = 0;
-
 sub init_progress {
    # Uses:
    #   $opt::bar
    # Returns:
    #   list of computers for progress output
    $|=1;
-    if (not $Global::is_terminal) {
-      $opt::min_progress_interval = 30;
-    }
    if($opt::bar) {
 	return("","");
    }
@@ -1876,9 +1870,6 @@ sub drain_job_queue {
    }
    my $last_header="";
    my $sleep = 0.2;
-    my $last_left = 1000000000;
-    my $last_progress_time = 0;
-    my $ps_reported = 0;
    do {
        while($Global::total_running > 0) {
            debug($Global::total_running, "==", scalar
@@ -1889,38 +1880,14 @@ sub drain_job_queue {
 		    close $job->fh(0,"w");
 		}
 	    }
-            # When not connected to terminal, assume CI (e.g. CircleCI). In
-            # that case we want occasional progress output to prevent abort
-            # due to timeout with no output, but we also need to stop sending
-            # progress output if there has been no actual progress, so that
-            # the job can time out appropriately (CirecleCI: 10m) in case of
-            # a hung test. But without special output, it is extremely
-            # annoying to diagnose which test is hung, so we add that using
-            # `ps` below.
-            if($opt::progress and
-               ($Global::is_terminal or (time() - $last_progress_time) >= 30)) {
+            if($opt::progress) {
                my %progress = progress();
                if($last_header ne $progress{'header'}) {
                    print $Global::original_stderr "\n", $progress{'header'}, "\n";
                    $last_header = $progress{'header'};
                }
-                if ($Global::is_terminal) {
-                    print $Global::original_stderr "\r",$progress{'status'};
-                }
-                if ($last_left > $Global::left) {
-                    if (not $Global::is_terminal) {
-                        print $Global::original_stderr $progress{'status'},"\n";
-                    }
-                    $last_progress_time = time();
-                    $ps_reported = 0;
-                } elsif (not $ps_reported and (time() - $last_progress_time) >= 60) {
-                    # No progress in at least 60 seconds: run ps
-                    print $Global::original_stderr "\n";
-                    system("ps", "-wf");
-                    $ps_reported = 1;
-                }
-                $last_left = $Global::left;
-                flush $Global::original_stderr;
+                print $Global::original_stderr "\r",$progress{'status'};
+		flush $Global::original_stderr;
            }
 	    if($Global::total_running < $Global::max_jobs_running
 	       and not $Global::JobQueue->empty()) {
@@ -1954,7 +1921,7 @@ sub drain_job_queue {
 	     not $Global::start_no_new_jobs and not $Global::JobQueue->empty());
    if($opt::progress) {
 	my %progress = progress();
-	print $Global::original_stderr $opt::progress_sep, $progress{'status'}, "\n";
+	print $Global::original_stderr "\r", $progress{'status'}, "\n";
 	flush $Global::original_stderr;
    }
 }
@@ -1987,11 +1954,10 @@ sub progress {
    my $eta = "";
    my ($status,$header)=("","");
    if($opt::eta) {
-      my($total, $completed, $left, $pctcomplete, $avgtime, $this_eta) =
-        compute_eta();
-      $eta = sprintf("ETA: %ds Left: %d AVG: %.2fs  ",
-        $this_eta, $left, $avgtime);
-      $Global::left = $left;
+	my($total, $completed, $left, $pctcomplete, $avgtime, $this_eta) =
+	    compute_eta();
+	$eta = sprintf("ETA: %ds Left: %d AVG: %.2fs  ",
+		       $this_eta, $left, $avgtime);
    }
    my $termcols = terminal_columns();
    my @workers = sort keys %Global::host;
@@ -20,11 +20,26 @@ STAT_FILE=${STAT_FILE:-$(mktemp -t -u rocksdb_test_stats_XXXX)}

 function cleanup {
  rm -rf $DATA_DIR
-  rm -f $STAT_FILE.*
+  rm -f $STAT_FILE.fillseq
+  rm -f $STAT_FILE.readrandom
+  rm -f $STAT_FILE.overwrite
+  rm -f $STAT_FILE.memtablefillreadrandom
 }

 trap cleanup EXIT

+if [ -z $GIT_BRANCH ]; then
+  git_br=`git rev-parse --abbrev-ref HEAD`
+else
+  git_br=$(basename $GIT_BRANCH)
+fi
+
+if [ $git_br == "master" ]; then
+  git_br=""
+else
+  git_br="."$git_br
+fi
+
 make release

 # measure fillseq + fill up the DB for overwrite benchmark
@@ -271,10 +286,12 @@ common_in_mem_args="--db=/dev/shm/rocksdb \
    --sync=0 \
    --verify_checksum=1 \
    --delete_obsolete_files_period_micros=314572800 \
+    --max_grandparent_overlap_factor=10 \
    --use_plain_table=1 \
    --open_files=-1 \
    --mmap_read=1 \
    --mmap_write=0 \
+    --memtablerep=prefix_hash \
    --bloom_bits=10 \
    --bloom_locality=1 \
    --perf_level=0"
@@ -361,7 +378,7 @@ function send_to_ods {
    echo >&2 "ERROR: Key $key doesn't have a value."
    return
  fi
-  curl --silent "https://www.intern.facebook.com/intern/agent/ods_set.php?entity=rocksdb_build&key=$key&value=$value" \
+  curl --silent "https://www.intern.facebook.com/intern/agent/ods_set.php?entity=rocksdb_build$git_br&key=$key&value=$value" \
    --connect-timeout 60
 }

@@ -68,7 +68,7 @@ $BinariesFolder = -Join($RootFolder, "\build\Debug\")

 if($WorkFolder -eq "") {

-    # If TEST_TMPDIR is set use it
+    # If TEST_TMPDIR is set use it    
    [string]$var = $Env:TEST_TMPDIR
    if($var -eq "") {
        $WorkFolder = -Join($RootFolder, "\db_tests\")
@@ -93,7 +93,7 @@ $ExcludeCasesSet = New-Object System.Collections.Generic.HashSet[string]
 if($ExcludeCases -ne "") {
    Write-Host "ExcludeCases: $ExcludeCases"
    $l = $ExcludeCases -split ' '
-    ForEach($t in $l) {
+    ForEach($t in $l) { 
      $ExcludeCasesSet.Add($t) | Out-Null
    }
 }
@@ -102,7 +102,7 @@ $ExcludeExesSet = New-Object System.Collections.Generic.HashSet[string]
 if($ExcludeExes -ne "") {
    Write-Host "ExcludeExe: $ExcludeExes"
    $l = $ExcludeExes -split ' '
-    ForEach($t in $l) {
+    ForEach($t in $l) { 
      $ExcludeExesSet.Add($t) | Out-Null
    }
 }
@@ -118,10 +118,6 @@ if($ExcludeExes -ne "") {
 #   MultiThreaded/MultiThreadedDBTest.
 #     MultiThreaded/0  # GetParam() = 0
 #     MultiThreaded/1  # GetParam() = 1
-#   RibbonTypeParamTest/0.  # TypeParam = struct DefaultTypesAndSettings
-#     CompactnessAndBacktrackAndFpRate
-#     Extremes
-#     FindOccupancyForSuccessRate
 #
 # into this:
 #
@@ -129,9 +125,6 @@ if($ExcludeExes -ne "") {
 #   DBTest.WriteEmptyBatch
 #   MultiThreaded/MultiThreadedDBTest.MultiThreaded/0
 #   MultiThreaded/MultiThreadedDBTest.MultiThreaded/1
-#   RibbonTypeParamTest/0.CompactnessAndBacktrackAndFpRate
-#   RibbonTypeParamTest/0.Extremes
-#   RibbonTypeParamTest/0.FindOccupancyForSuccessRate
 #
 # Output into the parameter in a form TestName -> Log File Name
 function ExtractTestCases([string]$GTestExe, $HashTable) {
@@ -145,8 +138,6 @@ function ExtractTestCases([string]$GTestExe, $HashTable) {

    ForEach( $l in $Tests) {

-      # remove trailing comment if any
-      $l = $l -replace '\s+\#.*',''
      # Leading whitespace is fine
      $l = $l -replace '^\s+',''
      # Trailing dot is a test group but no whitespace
@@ -155,7 +146,8 @@ function ExtractTestCases([string]$GTestExe, $HashTable) {
      }  else {
        # Otherwise it is a test name, remove leading space
        $test = $l
-        # create a log name
+        # remove trailing comment if any and create a log name
+        $test = $test -replace '\s+\#.*',''
        $test = "$Group$test"

        if($ExcludeCasesSet.Contains($test)) {
@@ -261,7 +253,7 @@ if($Run -ne "") {

  $DiscoveredExe = @()
  dir -Path $search_path | ForEach-Object {
-     $DiscoveredExe += ($_.Name)
+     $DiscoveredExe += ($_.Name)     
  }

  # Remove exclusions
@@ -301,7 +293,7 @@ if($SuiteRun -ne "") {

  $ListOfExe = @()
  dir -Path $search_path | ForEach-Object {
-     $ListOfExe += ($_.Name)
+     $ListOfExe += ($_.Name)     
  }

  # Exclude those in RunOnly from running as suites
@@ -356,7 +348,7 @@ function RunJobs($Suites, $TestCmds, [int]$ConcurrencyVal)

    # Wait for all to finish and get the results
    while(($JobToLog.Count -gt 0) -or
-          ($TestCmds.Count -gt 0) -or
+          ($TestCmds.Count -gt 0) -or 
           ($Suites.Count -gt 0)) {

        # Make sure we have maximum concurrent jobs running if anything
@@ -476,8 +468,8 @@ RunJobs -Suites $CasesToRun -TestCmds $TestExes -ConcurrencyVal $Concurrency

 $EndDate = (Get-Date)

-New-TimeSpan -Start $StartDate -End $EndDate |
-  ForEach-Object {
+New-TimeSpan -Start $StartDate -End $EndDate | 
+  ForEach-Object { 
    "Elapsed time: {0:g}" -f $_
  }

@@ -492,4 +484,4 @@ if(!$script:success) {

 exit 0

-
+ 
@@ -10,8 +10,6 @@
 #include "rocksdb/cache.h"

 #include "cache/lru_cache.h"
-#include "rocksdb/secondary_cache.h"
-#include "rocksdb/utilities/customizable_util.h"
 #include "rocksdb/utilities/options_type.h"
 #include "util/string_util.h"

@@ -36,13 +34,6 @@ static std::unordered_map<std::string, OptionTypeInfo>
 };
 #endif  // ROCKSDB_LITE

-Status SecondaryCache::CreateFromString(
-    const ConfigOptions& config_options, const std::string& value,
-    std::shared_ptr<SecondaryCache>* result) {
-  return LoadSharedObject<SecondaryCache>(config_options, value, nullptr,
-                                          result);
-}
-
 Status Cache::CreateFromString(const ConfigOptions& config_options,
                               const std::string& value,
                               std::shared_ptr<Cache>* result) {
@@ -53,9 +44,9 @@ Status Cache::CreateFromString(const ConfigOptions& config_options,
  } else {
 #ifndef ROCKSDB_LITE
    LRUCacheOptions cache_opts;
-    status = OptionTypeInfo::ParseStruct(config_options, "",
-                                         &lru_cache_options_type_info, "",
-                                         value, &cache_opts);
+    status = OptionTypeInfo::ParseStruct(
+        config_options, "", &lru_cache_options_type_info, "", value,
+        reinterpret_cast<char*>(&cache_opts));
    if (status.ok()) {
      cache = NewLRUCache(cache_opts);
    }
@@ -1,11 +1,8 @@
-//  Copyright (c) 2013-present, Facebook, Inc.  All rights reserved.
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
 //  This source code is licensed under both the GPLv2 (found in the
 //  COPYING file in the root directory) and Apache 2.0 License
 //  (found in the LICENSE.Apache file in the root directory).
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
 #ifndef GFLAGS
 #include <cstdio>
 int main() {
@@ -13,8 +10,372 @@ int main() {
  return 1;
 }
 #else
-#include "rocksdb/cache_bench_tool.h"
-int main(int argc, char** argv) {
-  return ROCKSDB_NAMESPACE::cache_bench_tool(argc, argv);
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <cinttypes>
+#include <limits>
+
+#include "port/port.h"
+#include "rocksdb/cache.h"
+#include "rocksdb/db.h"
+#include "rocksdb/env.h"
+#include "util/coding.h"
+#include "util/gflags_compat.h"
+#include "util/hash.h"
+#include "util/mutexlock.h"
+#include "util/random.h"
+
+using GFLAGS_NAMESPACE::ParseCommandLineFlags;
+
+static constexpr uint32_t KiB = uint32_t{1} << 10;
+static constexpr uint32_t MiB = KiB << 10;
+static constexpr uint64_t GiB = MiB << 10;
+
+DEFINE_uint32(threads, 16, "Number of concurrent threads to run.");
+DEFINE_uint64(cache_size, 1 * GiB,
+              "Number of bytes to use as a cache of uncompressed data.");
+DEFINE_uint32(num_shard_bits, 6, "shard_bits.");
+
+DEFINE_double(resident_ratio, 0.25,
+              "Ratio of keys fitting in cache to keyspace.");
+DEFINE_uint64(ops_per_thread, 0,
+              "Number of operations per thread. (Default: 5 * keyspace size)");
+DEFINE_uint32(value_bytes, 8 * KiB, "Size of each value added.");
+
+DEFINE_uint32(skew, 5, "Degree of skew in key selection");
+DEFINE_bool(populate_cache, true, "Populate cache before operations");
+
+DEFINE_uint32(lookup_insert_percent, 87,
+              "Ratio of lookup (+ insert on not found) to total workload "
+              "(expressed as a percentage)");
+DEFINE_uint32(insert_percent, 2,
+              "Ratio of insert to total workload (expressed as a percentage)");
+DEFINE_uint32(lookup_percent, 10,
+              "Ratio of lookup to total workload (expressed as a percentage)");
+DEFINE_uint32(erase_percent, 1,
+              "Ratio of erase to total workload (expressed as a percentage)");
+
+DEFINE_bool(use_clock_cache, false, "");
+
+namespace ROCKSDB_NAMESPACE {
+
+class CacheBench;
+namespace {
+// State shared by all concurrent executions of the same benchmark.
+class SharedState {
+ public:
+  explicit SharedState(CacheBench* cache_bench)
+      : cv_(&mu_),
+        num_initialized_(0),
+        start_(false),
+        num_done_(0),
+        cache_bench_(cache_bench) {}
+
+  ~SharedState() {}
+
+  port::Mutex* GetMutex() {
+    return &mu_;
+  }
+
+  port::CondVar* GetCondVar() {
+    return &cv_;
+  }
+
+  CacheBench* GetCacheBench() const {
+    return cache_bench_;
+  }
+
+  void IncInitialized() {
+    num_initialized_++;
+  }
+
+  void IncDone() {
+    num_done_++;
+  }
+
+  bool AllInitialized() const { return num_initialized_ >= FLAGS_threads; }
+
+  bool AllDone() const { return num_done_ >= FLAGS_threads; }
+
+  void SetStart() {
+    start_ = true;
+  }
+
+  bool Started() const {
+    return start_;
+  }
+
+ private:
+  port::Mutex mu_;
+  port::CondVar cv_;
+
+  uint64_t num_initialized_;
+  bool start_;
+  uint64_t num_done_;
+
+  CacheBench* cache_bench_;
+};
+
+// Per-thread state for concurrent executions of the same benchmark.
+struct ThreadState {
+  uint32_t tid;
+  Random64 rnd;
+  SharedState* shared;
+
+  ThreadState(uint32_t index, SharedState* _shared)
+      : tid(index), rnd(1000 + index), shared(_shared) {}
+};
+
+struct KeyGen {
+  char key_data[27];
+
+  Slice GetRand(Random64& rnd, uint64_t max_key) {
+    uint64_t raw = rnd.Next();
+    // Skew according to setting
+    for (uint32_t i = 0; i < FLAGS_skew; ++i) {
+      raw = std::min(raw, rnd.Next());
+    }
+    uint64_t key = FastRange64(raw, max_key);
+    // Variable size and alignment
+    size_t off = key % 8;
+    key_data[0] = char{42};
+    EncodeFixed64(key_data + 1, key);
+    key_data[9] = char{11};
+    EncodeFixed64(key_data + 10, key);
+    key_data[18] = char{4};
+    EncodeFixed64(key_data + 19, key);
+    return Slice(&key_data[off], sizeof(key_data) - off);
+  }
+};
+
+char* createValue(Random64& rnd) {
+  char* rv = new char[FLAGS_value_bytes];
+  // Fill with some filler data, and take some CPU time
+  for (uint32_t i = 0; i < FLAGS_value_bytes; i += 8) {
+    EncodeFixed64(rv + i, rnd.Next());
+  }
+  return rv;
 }
+
+void deleter(const Slice& /*key*/, void* value) {
+  delete[] static_cast<char*>(value);
+}
+}  // namespace
+
+class CacheBench {
+  static constexpr uint64_t kHundredthUint64 =
+      std::numeric_limits<uint64_t>::max() / 100U;
+
+ public:
+  CacheBench()
+      : max_key_(static_cast<uint64_t>(FLAGS_cache_size / FLAGS_resident_ratio /
+                                       FLAGS_value_bytes)),
+        lookup_insert_threshold_(kHundredthUint64 *
+                                 FLAGS_lookup_insert_percent),
+        insert_threshold_(lookup_insert_threshold_ +
+                          kHundredthUint64 * FLAGS_insert_percent),
+        lookup_threshold_(insert_threshold_ +
+                          kHundredthUint64 * FLAGS_lookup_percent),
+        erase_threshold_(lookup_threshold_ +
+                         kHundredthUint64 * FLAGS_erase_percent) {
+    if (erase_threshold_ != 100U * kHundredthUint64) {
+      fprintf(stderr, "Percentages must add to 100.\n");
+      exit(1);
+    }
+    if (FLAGS_use_clock_cache) {
+      cache_ = NewClockCache(FLAGS_cache_size, FLAGS_num_shard_bits);
+      if (!cache_) {
+        fprintf(stderr, "Clock cache not supported.\n");
+        exit(1);
+      }
+    } else {
+      cache_ = NewLRUCache(FLAGS_cache_size, FLAGS_num_shard_bits);
+    }
+    if (FLAGS_ops_per_thread == 0) {
+      FLAGS_ops_per_thread = 5 * max_key_;
+    }
+  }
+
+  ~CacheBench() {}
+
+  void PopulateCache() {
+    Random64 rnd(1);
+    KeyGen keygen;
+    for (uint64_t i = 0; i < 2 * FLAGS_cache_size; i += FLAGS_value_bytes) {
+      cache_->Insert(keygen.GetRand(rnd, max_key_), createValue(rnd),
+                     FLAGS_value_bytes, &deleter);
+    }
+  }
+
+  bool Run() {
+    ROCKSDB_NAMESPACE::Env* env = ROCKSDB_NAMESPACE::Env::Default();
+
+    PrintEnv();
+    SharedState shared(this);
+    std::vector<std::unique_ptr<ThreadState> > threads(FLAGS_threads);
+    for (uint32_t i = 0; i < FLAGS_threads; i++) {
+      threads[i].reset(new ThreadState(i, &shared));
+      env->StartThread(ThreadBody, threads[i].get());
+    }
+    {
+      MutexLock l(shared.GetMutex());
+      while (!shared.AllInitialized()) {
+        shared.GetCondVar()->Wait();
+      }
+      // Record start time
+      uint64_t start_time = env->NowMicros();
+
+      // Start all threads
+      shared.SetStart();
+      shared.GetCondVar()->SignalAll();
+
+      // Wait threads to complete
+      while (!shared.AllDone()) {
+        shared.GetCondVar()->Wait();
+      }
+
+      // Record end time
+      uint64_t end_time = env->NowMicros();
+      double elapsed = static_cast<double>(end_time - start_time) * 1e-6;
+      uint32_t qps = static_cast<uint32_t>(
+          static_cast<double>(FLAGS_threads * FLAGS_ops_per_thread) / elapsed);
+      fprintf(stdout, "Complete in %.3f s; QPS = %u\n", elapsed, qps);
+    }
+    return true;
+  }
+
+ private:
+  std::shared_ptr<Cache> cache_;
+  const uint64_t max_key_;
+  // Cumulative thresholds in the space of a random uint64_t
+  const uint64_t lookup_insert_threshold_;
+  const uint64_t insert_threshold_;
+  const uint64_t lookup_threshold_;
+  const uint64_t erase_threshold_;
+
+  static void ThreadBody(void* v) {
+    ThreadState* thread = static_cast<ThreadState*>(v);
+    SharedState* shared = thread->shared;
+
+    {
+      MutexLock l(shared->GetMutex());
+      shared->IncInitialized();
+      if (shared->AllInitialized()) {
+        shared->GetCondVar()->SignalAll();
+      }
+      while (!shared->Started()) {
+        shared->GetCondVar()->Wait();
+      }
+    }
+    thread->shared->GetCacheBench()->OperateCache(thread);
+
+    {
+      MutexLock l(shared->GetMutex());
+      shared->IncDone();
+      if (shared->AllDone()) {
+        shared->GetCondVar()->SignalAll();
+      }
+    }
+  }
+
+  void OperateCache(ThreadState* thread) {
+    // To use looked-up values
+    uint64_t result = 0;
+    // To hold handles for a non-trivial amount of time
+    Cache::Handle* handle = nullptr;
+    KeyGen gen;
+    for (uint64_t i = 0; i < FLAGS_ops_per_thread; i++) {
+      Slice key = gen.GetRand(thread->rnd, max_key_);
+      uint64_t random_op = thread->rnd.Next();
+      if (random_op < lookup_insert_threshold_) {
+        if (handle) {
+          cache_->Release(handle);
+          handle = nullptr;
+        }
+        // do lookup
+        handle = cache_->Lookup(key);
+        if (handle) {
+          // do something with the data
+          result += NPHash64(static_cast<char*>(cache_->Value(handle)),
+                             FLAGS_value_bytes);
+        } else {
+          // do insert
+          cache_->Insert(key, createValue(thread->rnd), FLAGS_value_bytes,
+                         &deleter, &handle);
+        }
+      } else if (random_op < insert_threshold_) {
+        if (handle) {
+          cache_->Release(handle);
+          handle = nullptr;
+        }
+        // do insert
+        cache_->Insert(key, createValue(thread->rnd), FLAGS_value_bytes,
+                       &deleter, &handle);
+      } else if (random_op < lookup_threshold_) {
+        if (handle) {
+          cache_->Release(handle);
+          handle = nullptr;
+        }
+        // do lookup
+        handle = cache_->Lookup(key);
+        if (handle) {
+          // do something with the data
+          result += NPHash64(static_cast<char*>(cache_->Value(handle)),
+                             FLAGS_value_bytes);
+        }
+      } else if (random_op < erase_threshold_) {
+        // do erase
+        cache_->Erase(key);
+      } else {
+        // Should be extremely unlikely (noop)
+        assert(random_op >= kHundredthUint64 * 100U);
+      }
+    }
+    if (handle) {
+      cache_->Release(handle);
+      handle = nullptr;
+    }
+  }
+
+  void PrintEnv() const {
+    printf("RocksDB version     : %d.%d\n", kMajorVersion, kMinorVersion);
+    printf("Number of threads   : %u\n", FLAGS_threads);
+    printf("Ops per thread      : %" PRIu64 "\n", FLAGS_ops_per_thread);
+    printf("Cache size          : %" PRIu64 "\n", FLAGS_cache_size);
+    printf("Num shard bits      : %u\n", FLAGS_num_shard_bits);
+    printf("Max key             : %" PRIu64 "\n", max_key_);
+    printf("Resident ratio      : %g\n", FLAGS_resident_ratio);
+    printf("Skew degree         : %u\n", FLAGS_skew);
+    printf("Populate cache      : %d\n", int{FLAGS_populate_cache});
+    printf("Lookup+Insert pct   : %u%%\n", FLAGS_lookup_insert_percent);
+    printf("Insert percentage   : %u%%\n", FLAGS_insert_percent);
+    printf("Lookup percentage   : %u%%\n", FLAGS_lookup_percent);
+    printf("Erase percentage    : %u%%\n", FLAGS_erase_percent);
+    printf("----------------------------\n");
+  }
+};
+}  // namespace ROCKSDB_NAMESPACE
+
+int main(int argc, char** argv) {
+  ParseCommandLineFlags(&argc, &argv, true);
+
+  if (FLAGS_threads <= 0) {
+    fprintf(stderr, "threads number <= 0\n");
+    exit(1);
+  }
+
+  ROCKSDB_NAMESPACE::CacheBench bench;
+  if (FLAGS_populate_cache) {
+    bench.PopulateCache();
+    printf("Population complete\n");
+    printf("----------------------------\n");
+  }
+  if (bench.Run()) {
+    return 0;
+  } else {
+    return 1;
+  }
+}
+
 #endif  // GFLAGS
@@ -1,572 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#ifdef GFLAGS
-#include <cinttypes>
-#include <cstdio>
-#include <limits>
-#include <set>
-#include <sstream>
-
-#include "monitoring/histogram.h"
-#include "port/port.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/convenience.h"
-#include "rocksdb/db.h"
-#include "rocksdb/env.h"
-#include "rocksdb/secondary_cache.h"
-#include "rocksdb/system_clock.h"
-#include "table/block_based/cachable_entry.h"
-#include "util/coding.h"
-#include "util/gflags_compat.h"
-#include "util/hash.h"
-#include "util/mutexlock.h"
-#include "util/random.h"
-#include "util/stop_watch.h"
-#include "util/string_util.h"
-
-using GFLAGS_NAMESPACE::ParseCommandLineFlags;
-
-static constexpr uint32_t KiB = uint32_t{1} << 10;
-static constexpr uint32_t MiB = KiB << 10;
-static constexpr uint64_t GiB = MiB << 10;
-
-DEFINE_uint32(threads, 16, "Number of concurrent threads to run.");
-DEFINE_uint64(cache_size, 1 * GiB,
-              "Number of bytes to use as a cache of uncompressed data.");
-DEFINE_uint32(num_shard_bits, 6, "shard_bits.");
-
-DEFINE_double(resident_ratio, 0.25,
-              "Ratio of keys fitting in cache to keyspace.");
-DEFINE_uint64(ops_per_thread, 2000000U, "Number of operations per thread.");
-DEFINE_uint32(value_bytes, 8 * KiB, "Size of each value added.");
-
-DEFINE_uint32(skew, 5, "Degree of skew in key selection");
-DEFINE_bool(populate_cache, true, "Populate cache before operations");
-
-DEFINE_uint32(lookup_insert_percent, 87,
-              "Ratio of lookup (+ insert on not found) to total workload "
-              "(expressed as a percentage)");
-DEFINE_uint32(insert_percent, 2,
-              "Ratio of insert to total workload (expressed as a percentage)");
-DEFINE_uint32(lookup_percent, 10,
-              "Ratio of lookup to total workload (expressed as a percentage)");
-DEFINE_uint32(erase_percent, 1,
-              "Ratio of erase to total workload (expressed as a percentage)");
-DEFINE_bool(gather_stats, false,
-            "Whether to periodically simulate gathering block cache stats, "
-            "using one more thread.");
-DEFINE_uint32(
-    gather_stats_sleep_ms, 1000,
-    "How many milliseconds to sleep between each gathering of stats.");
-
-DEFINE_uint32(gather_stats_entries_per_lock, 256,
-              "For Cache::ApplyToAllEntries");
-DEFINE_bool(skewed, false, "If true, skew the key access distribution");
-#ifndef ROCKSDB_LITE
-DEFINE_string(secondary_cache_uri, "",
-              "Full URI for creating a custom secondary cache object");
-static class std::shared_ptr<ROCKSDB_NAMESPACE::SecondaryCache> secondary_cache;
-#endif  // ROCKSDB_LITE
-
-DEFINE_bool(use_clock_cache, false, "");
-
-namespace ROCKSDB_NAMESPACE {
-
-class CacheBench;
-namespace {
-// State shared by all concurrent executions of the same benchmark.
-class SharedState {
- public:
-  explicit SharedState(CacheBench* cache_bench)
-      : cv_(&mu_),
-        num_initialized_(0),
-        start_(false),
-        num_done_(0),
-        cache_bench_(cache_bench) {}
-
-  ~SharedState() {}
-
-  port::Mutex* GetMutex() { return &mu_; }
-
-  port::CondVar* GetCondVar() { return &cv_; }
-
-  CacheBench* GetCacheBench() const { return cache_bench_; }
-
-  void IncInitialized() { num_initialized_++; }
-
-  void IncDone() { num_done_++; }
-
-  bool AllInitialized() const { return num_initialized_ >= FLAGS_threads; }
-
-  bool AllDone() const { return num_done_ >= FLAGS_threads; }
-
-  void SetStart() { start_ = true; }
-
-  bool Started() const { return start_; }
-
- private:
-  port::Mutex mu_;
-  port::CondVar cv_;
-
-  uint64_t num_initialized_;
-  bool start_;
-  uint64_t num_done_;
-
-  CacheBench* cache_bench_;
-};
-
-// Per-thread state for concurrent executions of the same benchmark.
-struct ThreadState {
-  uint32_t tid;
-  Random64 rnd;
-  SharedState* shared;
-  HistogramImpl latency_ns_hist;
-  uint64_t duration_us = 0;
-
-  ThreadState(uint32_t index, SharedState* _shared)
-      : tid(index), rnd(1000 + index), shared(_shared) {}
-};
-
-struct KeyGen {
-  char key_data[27];
-
-  Slice GetRand(Random64& rnd, uint64_t max_key, int max_log) {
-    uint64_t key = 0;
-    if (!FLAGS_skewed) {
-      uint64_t raw = rnd.Next();
-      // Skew according to setting
-      for (uint32_t i = 0; i < FLAGS_skew; ++i) {
-        raw = std::min(raw, rnd.Next());
-      }
-      key = FastRange64(raw, max_key);
-    } else {
-      key = rnd.Skewed(max_log);
-      if (key > max_key) {
-        key -= max_key;
-      }
-    }
-    // Variable size and alignment
-    size_t off = key % 8;
-    key_data[0] = char{42};
-    EncodeFixed64(key_data + 1, key);
-    key_data[9] = char{11};
-    EncodeFixed64(key_data + 10, key);
-    key_data[18] = char{4};
-    EncodeFixed64(key_data + 19, key);
-    return Slice(&key_data[off], sizeof(key_data) - off);
-  }
-};
-
-char* createValue(Random64& rnd) {
-  char* rv = new char[FLAGS_value_bytes];
-  // Fill with some filler data, and take some CPU time
-  for (uint32_t i = 0; i < FLAGS_value_bytes; i += 8) {
-    EncodeFixed64(rv + i, rnd.Next());
-  }
-  return rv;
-}
-
-// Callbacks for secondary cache
-size_t SizeFn(void* /*obj*/) { return FLAGS_value_bytes; }
-
-Status SaveToFn(void* obj, size_t /*offset*/, size_t size, void* out) {
-  memcpy(out, obj, size);
-  return Status::OK();
-}
-
-// Different deleters to simulate using deleter to gather
-// stats on the code origin and kind of cache entries.
-void deleter1(const Slice& /*key*/, void* value) {
-  delete[] static_cast<char*>(value);
-}
-void deleter2(const Slice& /*key*/, void* value) {
-  delete[] static_cast<char*>(value);
-}
-void deleter3(const Slice& /*key*/, void* value) {
-  delete[] static_cast<char*>(value);
-}
-
-Cache::CacheItemHelper helper1(SizeFn, SaveToFn, deleter1);
-Cache::CacheItemHelper helper2(SizeFn, SaveToFn, deleter2);
-Cache::CacheItemHelper helper3(SizeFn, SaveToFn, deleter3);
-}  // namespace
-
-class CacheBench {
-  static constexpr uint64_t kHundredthUint64 =
-      std::numeric_limits<uint64_t>::max() / 100U;
-
- public:
-  CacheBench()
-      : max_key_(static_cast<uint64_t>(FLAGS_cache_size / FLAGS_resident_ratio /
-                                       FLAGS_value_bytes)),
-        lookup_insert_threshold_(kHundredthUint64 *
-                                 FLAGS_lookup_insert_percent),
-        insert_threshold_(lookup_insert_threshold_ +
-                          kHundredthUint64 * FLAGS_insert_percent),
-        lookup_threshold_(insert_threshold_ +
-                          kHundredthUint64 * FLAGS_lookup_percent),
-        erase_threshold_(lookup_threshold_ +
-                         kHundredthUint64 * FLAGS_erase_percent),
-        skewed_(FLAGS_skewed) {
-    if (erase_threshold_ != 100U * kHundredthUint64) {
-      fprintf(stderr, "Percentages must add to 100.\n");
-      exit(1);
-    }
-
-    max_log_ = 0;
-    if (skewed_) {
-      uint64_t max_key = max_key_;
-      while (max_key >>= 1) max_log_++;
-      if (max_key > (1u << max_log_)) max_log_++;
-    }
-
-    if (FLAGS_use_clock_cache) {
-      cache_ = NewClockCache(FLAGS_cache_size, FLAGS_num_shard_bits);
-      if (!cache_) {
-        fprintf(stderr, "Clock cache not supported.\n");
-        exit(1);
-      }
-    } else {
-      LRUCacheOptions opts(FLAGS_cache_size, FLAGS_num_shard_bits, false, 0.5);
-#ifndef ROCKSDB_LITE
-      if (!FLAGS_secondary_cache_uri.empty()) {
-        Status s = SecondaryCache::CreateFromString(
-            ConfigOptions(), FLAGS_secondary_cache_uri, &secondary_cache);
-        if (secondary_cache == nullptr) {
-          fprintf(
-              stderr,
-              "No secondary cache registered matching string: %s status=%s\n",
-              FLAGS_secondary_cache_uri.c_str(), s.ToString().c_str());
-          exit(1);
-        }
-        opts.secondary_cache = secondary_cache;
-      }
-#endif  // ROCKSDB_LITE
-
-      cache_ = NewLRUCache(opts);
-    }
-  }
-
-  ~CacheBench() {}
-
-  void PopulateCache() {
-    Random64 rnd(1);
-    KeyGen keygen;
-    for (uint64_t i = 0; i < 2 * FLAGS_cache_size; i += FLAGS_value_bytes) {
-      cache_->Insert(keygen.GetRand(rnd, max_key_, max_log_), createValue(rnd),
-                     &helper1, FLAGS_value_bytes);
-    }
-  }
-
-  bool Run() {
-    const auto clock = SystemClock::Default().get();
-
-    PrintEnv();
-    SharedState shared(this);
-    std::vector<std::unique_ptr<ThreadState> > threads(FLAGS_threads);
-    for (uint32_t i = 0; i < FLAGS_threads; i++) {
-      threads[i].reset(new ThreadState(i, &shared));
-      std::thread(ThreadBody, threads[i].get()).detach();
-    }
-
-    HistogramImpl stats_hist;
-    std::string stats_report;
-    std::thread stats_thread(StatsBody, &shared, &stats_hist, &stats_report);
-
-    uint64_t start_time;
-    {
-      MutexLock l(shared.GetMutex());
-      while (!shared.AllInitialized()) {
-        shared.GetCondVar()->Wait();
-      }
-      // Record start time
-      start_time = clock->NowMicros();
-
-      // Start all threads
-      shared.SetStart();
-      shared.GetCondVar()->SignalAll();
-
-      // Wait threads to complete
-      while (!shared.AllDone()) {
-        shared.GetCondVar()->Wait();
-      }
-    }
-
-    // Stats gathering is considered background work. This time measurement
-    // is for foreground work, and not really ideal for that. See below.
-    uint64_t end_time = clock->NowMicros();
-    stats_thread.join();
-
-    // Wall clock time - includes idle time if threads
-    // finish at different times (not ideal).
-    double elapsed_secs = static_cast<double>(end_time - start_time) * 1e-6;
-    uint32_t ops_per_sec = static_cast<uint32_t>(
-        1.0 * FLAGS_threads * FLAGS_ops_per_thread / elapsed_secs);
-    printf("Complete in %.3f s; Rough parallel ops/sec = %u\n", elapsed_secs,
-           ops_per_sec);
-
-    // Total time in each thread (more accurate throughput measure)
-    elapsed_secs = 0;
-    for (uint32_t i = 0; i < FLAGS_threads; i++) {
-      elapsed_secs += threads[i]->duration_us * 1e-6;
-    }
-    ops_per_sec = static_cast<uint32_t>(1.0 * FLAGS_threads *
-                                        FLAGS_ops_per_thread / elapsed_secs);
-    printf("Thread ops/sec = %u\n", ops_per_sec);
-
-    printf("\nOperation latency (ns):\n");
-    HistogramImpl combined;
-    for (uint32_t i = 0; i < FLAGS_threads; i++) {
-      combined.Merge(threads[i]->latency_ns_hist);
-    }
-    printf("%s", combined.ToString().c_str());
-
-    if (FLAGS_gather_stats) {
-      printf("\nGather stats latency (us):\n");
-      printf("%s", stats_hist.ToString().c_str());
-    }
-
-    printf("\n%s", stats_report.c_str());
-
-    return true;
-  }
-
- private:
-  std::shared_ptr<Cache> cache_;
-  const uint64_t max_key_;
-  // Cumulative thresholds in the space of a random uint64_t
-  const uint64_t lookup_insert_threshold_;
-  const uint64_t insert_threshold_;
-  const uint64_t lookup_threshold_;
-  const uint64_t erase_threshold_;
-  const bool skewed_;
-  int max_log_;
-
-  // A benchmark version of gathering stats on an active block cache by
-  // iterating over it. The primary purpose is to measure the impact of
-  // gathering stats with ApplyToAllEntries on throughput- and
-  // latency-sensitive Cache users. Performance of stats gathering is
-  // also reported. The last set of gathered stats is also reported, for
-  // manual sanity checking for logical errors or other unexpected
-  // behavior of cache_bench or the underlying Cache.
-  static void StatsBody(SharedState* shared, HistogramImpl* stats_hist,
-                        std::string* stats_report) {
-    if (!FLAGS_gather_stats) {
-      return;
-    }
-    const auto clock = SystemClock::Default().get();
-    uint64_t total_key_size = 0;
-    uint64_t total_charge = 0;
-    uint64_t total_entry_count = 0;
-    std::set<Cache::DeleterFn> deleters;
-    StopWatchNano timer(clock);
-
-    for (;;) {
-      uint64_t time;
-      time = clock->NowMicros();
-      uint64_t deadline = time + uint64_t{FLAGS_gather_stats_sleep_ms} * 1000;
-
-      {
-        MutexLock l(shared->GetMutex());
-        for (;;) {
-          if (shared->AllDone()) {
-            std::ostringstream ostr;
-            ostr << "Most recent cache entry stats:\n"
-                 << "Number of entries: " << total_entry_count << "\n"
-                 << "Total charge: " << BytesToHumanString(total_charge) << "\n"
-                 << "Average key size: "
-                 << (1.0 * total_key_size / total_entry_count) << "\n"
-                 << "Average charge: "
-                 << BytesToHumanString(1.0 * total_charge / total_entry_count)
-                 << "\n"
-                 << "Unique deleters: " << deleters.size() << "\n";
-            *stats_report = ostr.str();
-            return;
-          }
-          if (clock->NowMicros() >= deadline) {
-            break;
-          }
-          uint64_t diff = deadline - std::min(clock->NowMicros(), deadline);
-          shared->GetCondVar()->TimedWait(diff + 1);
-        }
-      }
-
-      // Now gather stats, outside of mutex
-      total_key_size = 0;
-      total_charge = 0;
-      total_entry_count = 0;
-      deleters.clear();
-      auto fn = [&](const Slice& key, void* /*value*/, size_t charge,
-                    Cache::DeleterFn deleter) {
-        total_key_size += key.size();
-        total_charge += charge;
-        ++total_entry_count;
-        // Something slightly more expensive as in (future) stats by category
-        deleters.insert(deleter);
-      };
-      timer.Start();
-      Cache::ApplyToAllEntriesOptions opts;
-      opts.average_entries_per_lock = FLAGS_gather_stats_entries_per_lock;
-      shared->GetCacheBench()->cache_->ApplyToAllEntries(fn, opts);
-      stats_hist->Add(timer.ElapsedNanos() / 1000);
-    }
-  }
-
-  static void ThreadBody(ThreadState* thread) {
-    SharedState* shared = thread->shared;
-
-    {
-      MutexLock l(shared->GetMutex());
-      shared->IncInitialized();
-      if (shared->AllInitialized()) {
-        shared->GetCondVar()->SignalAll();
-      }
-      while (!shared->Started()) {
-        shared->GetCondVar()->Wait();
-      }
-    }
-    thread->shared->GetCacheBench()->OperateCache(thread);
-
-    {
-      MutexLock l(shared->GetMutex());
-      shared->IncDone();
-      if (shared->AllDone()) {
-        shared->GetCondVar()->SignalAll();
-      }
-    }
-  }
-
-  void OperateCache(ThreadState* thread) {
-    // To use looked-up values
-    uint64_t result = 0;
-    // To hold handles for a non-trivial amount of time
-    Cache::Handle* handle = nullptr;
-    KeyGen gen;
-    const auto clock = SystemClock::Default().get();
-    uint64_t start_time = clock->NowMicros();
-    StopWatchNano timer(clock);
-
-    for (uint64_t i = 0; i < FLAGS_ops_per_thread; i++) {
-      timer.Start();
-      Slice key = gen.GetRand(thread->rnd, max_key_, max_log_);
-      uint64_t random_op = thread->rnd.Next();
-      Cache::CreateCallback create_cb =
-          [](void* buf, size_t size, void** out_obj, size_t* charge) -> Status {
-        *out_obj = reinterpret_cast<void*>(new char[size]);
-        memcpy(*out_obj, buf, size);
-        *charge = size;
-        return Status::OK();
-      };
-
-      if (random_op < lookup_insert_threshold_) {
-        if (handle) {
-          cache_->Release(handle);
-          handle = nullptr;
-        }
-        // do lookup
-        handle = cache_->Lookup(key, &helper2, create_cb, Cache::Priority::LOW,
-                                true);
-        if (handle) {
-          // do something with the data
-          result += NPHash64(static_cast<char*>(cache_->Value(handle)),
-                             FLAGS_value_bytes);
-        } else {
-          // do insert
-          cache_->Insert(key, createValue(thread->rnd), &helper2,
-                         FLAGS_value_bytes, &handle);
-        }
-      } else if (random_op < insert_threshold_) {
-        if (handle) {
-          cache_->Release(handle);
-          handle = nullptr;
-        }
-        // do insert
-        cache_->Insert(key, createValue(thread->rnd), &helper3,
-                       FLAGS_value_bytes, &handle);
-      } else if (random_op < lookup_threshold_) {
-        if (handle) {
-          cache_->Release(handle);
-          handle = nullptr;
-        }
-        // do lookup
-        handle = cache_->Lookup(key, &helper2, create_cb, Cache::Priority::LOW,
-                                true);
-        if (handle) {
-          // do something with the data
-          result += NPHash64(static_cast<char*>(cache_->Value(handle)),
-                             FLAGS_value_bytes);
-        }
-      } else if (random_op < erase_threshold_) {
-        // do erase
-        cache_->Erase(key);
-      } else {
-        // Should be extremely unlikely (noop)
-        assert(random_op >= kHundredthUint64 * 100U);
-      }
-      thread->latency_ns_hist.Add(timer.ElapsedNanos());
-    }
-    if (handle) {
-      cache_->Release(handle);
-      handle = nullptr;
-    }
-    // Ensure computations on `result` are not optimized away.
-    if (result == 1) {
-      printf("You are extremely unlucky(2). Try again.\n");
-      exit(1);
-    }
-    thread->duration_us = clock->NowMicros() - start_time;
-  }
-
-  void PrintEnv() const {
-    printf("RocksDB version     : %d.%d\n", kMajorVersion, kMinorVersion);
-    printf("Number of threads   : %u\n", FLAGS_threads);
-    printf("Ops per thread      : %" PRIu64 "\n", FLAGS_ops_per_thread);
-    printf("Cache size          : %s\n",
-           BytesToHumanString(FLAGS_cache_size).c_str());
-    printf("Num shard bits      : %u\n", FLAGS_num_shard_bits);
-    printf("Max key             : %" PRIu64 "\n", max_key_);
-    printf("Resident ratio      : %g\n", FLAGS_resident_ratio);
-    printf("Skew degree         : %u\n", FLAGS_skew);
-    printf("Populate cache      : %d\n", int{FLAGS_populate_cache});
-    printf("Lookup+Insert pct   : %u%%\n", FLAGS_lookup_insert_percent);
-    printf("Insert percentage   : %u%%\n", FLAGS_insert_percent);
-    printf("Lookup percentage   : %u%%\n", FLAGS_lookup_percent);
-    printf("Erase percentage    : %u%%\n", FLAGS_erase_percent);
-    std::ostringstream stats;
-    if (FLAGS_gather_stats) {
-      stats << "enabled (" << FLAGS_gather_stats_sleep_ms << "ms, "
-            << FLAGS_gather_stats_entries_per_lock << "/lock)";
-    } else {
-      stats << "disabled";
-    }
-    printf("Gather stats        : %s\n", stats.str().c_str());
-    printf("----------------------------\n");
-  }
-};
-
-int cache_bench_tool(int argc, char** argv) {
-  ParseCommandLineFlags(&argc, &argv, true);
-
-  if (FLAGS_threads <= 0) {
-    fprintf(stderr, "threads number <= 0\n");
-    exit(1);
-  }
-
-  ROCKSDB_NAMESPACE::CacheBench bench;
-  if (FLAGS_populate_cache) {
-    bench.PopulateCache();
-    printf("Population complete\n");
-    printf("----------------------------\n");
-  }
-  if (bench.Run()) {
-    return 0;
-  } else {
-    return 1;
-  }
-}  // namespace ROCKSDB_NAMESPACE
-}  // namespace ROCKSDB_NAMESPACE
-
-#endif  // GFLAGS
@@ -1,70 +0,0 @@
-//  Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "cache/cache_entry_roles.h"
-
-#include <mutex>
-
-#include "port/lang.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-std::array<const char*, kNumCacheEntryRoles> kCacheEntryRoleToCamelString{{
-    "DataBlock",
-    "FilterBlock",
-    "FilterMetaBlock",
-    "DeprecatedFilterBlock",
-    "IndexBlock",
-    "OtherBlock",
-    "WriteBuffer",
-    "CompressionDictionaryBuildingBuffer",
-    "FilterConstruction",
-    "Misc",
-}};
-
-std::array<const char*, kNumCacheEntryRoles> kCacheEntryRoleToHyphenString{{
-    "data-block",
-    "filter-block",
-    "filter-meta-block",
-    "deprecated-filter-block",
-    "index-block",
-    "other-block",
-    "write-buffer",
-    "compression-dictionary-building-buffer",
-    "filter-construction",
-    "misc",
-}};
-
-namespace {
-
-struct Registry {
-  std::mutex mutex;
-  std::unordered_map<Cache::DeleterFn, CacheEntryRole> role_map;
-  void Register(Cache::DeleterFn fn, CacheEntryRole role) {
-    std::lock_guard<std::mutex> lock(mutex);
-    role_map[fn] = role;
-  }
-  std::unordered_map<Cache::DeleterFn, CacheEntryRole> Copy() {
-    std::lock_guard<std::mutex> lock(mutex);
-    return role_map;
-  }
-};
-
-Registry& GetRegistry() {
-  STATIC_AVOID_DESTRUCTION(Registry, registry);
-  return registry;
-}
-
-}  // namespace
-
-void RegisterCacheDeleterRole(Cache::DeleterFn fn, CacheEntryRole role) {
-  GetRegistry().Register(fn, role);
-}
-
-std::unordered_map<Cache::DeleterFn, CacheEntryRole> CopyCacheDeleterRoleMap() {
-  return GetRegistry().Copy();
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,134 +0,0 @@
-//  Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <array>
-#include <cstdint>
-#include <memory>
-#include <type_traits>
-#include <unordered_map>
-
-#include "rocksdb/cache.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// Classifications of block cache entries, for reporting statistics
-// Adding new enum to this class requires corresponding updates to
-// kCacheEntryRoleToCamelString and kCacheEntryRoleToHyphenString
-enum class CacheEntryRole {
-  // Block-based table data block
-  kDataBlock,
-  // Block-based table filter block (full or partitioned)
-  kFilterBlock,
-  // Block-based table metadata block for partitioned filter
-  kFilterMetaBlock,
-  // Block-based table deprecated filter block (old "block-based" filter)
-  kDeprecatedFilterBlock,
-  // Block-based table index block
-  kIndexBlock,
-  // Other kinds of block-based table block
-  kOtherBlock,
-  // WriteBufferManager reservations to account for memtable usage
-  kWriteBuffer,
-  // BlockBasedTableBuilder reservations to account for
-  // compression dictionary building buffer's memory usage
-  kCompressionDictionaryBuildingBuffer,
-  // Filter reservations to account for
-  // (new) bloom and ribbon filter construction's memory usage
-  kFilterConstruction,
-  // Default bucket, for miscellaneous cache entries. Do not use for
-  // entries that could potentially add up to large usage.
-  kMisc,
-};
-constexpr uint32_t kNumCacheEntryRoles =
-    static_cast<uint32_t>(CacheEntryRole::kMisc) + 1;
-
-extern std::array<const char*, kNumCacheEntryRoles>
-    kCacheEntryRoleToCamelString;
-extern std::array<const char*, kNumCacheEntryRoles>
-    kCacheEntryRoleToHyphenString;
-
-// To associate cache entries with their role, we use a hack on the
-// existing Cache interface. Because the deleter of an entry can authenticate
-// the code origin of an entry, we can elaborate the choice of deleter to
-// also encode role information, without inferring false role information
-// from entries not choosing to encode a role.
-//
-// The rest of this file is for handling mappings between deleters and
-// roles.
-
-// To infer a role from a deleter, the deleter must be registered. This
-// can be done "manually" with this function. This function is thread-safe,
-// and the registration mappings go into private but static storage. (Note
-// that DeleterFn is a function pointer, not std::function. Registrations
-// should not be too many.)
-void RegisterCacheDeleterRole(Cache::DeleterFn fn, CacheEntryRole role);
-
-// Gets a copy of the registered deleter -> role mappings. This is the only
-// function for reading the mappings made with RegisterCacheDeleterRole.
-// Why only this interface for reading?
-// * This function has to be thread safe, which could incur substantial
-// overhead. We should not pay this overhead for every deleter look-up.
-// * This is suitable for preparing for batch operations, like with
-// CacheEntryStatsCollector.
-// * The number of mappings should be sufficiently small (dozens).
-std::unordered_map<Cache::DeleterFn, CacheEntryRole> CopyCacheDeleterRoleMap();
-
-// ************************************************************** //
-// An automatic registration infrastructure. This enables code
-// to simply ask for a deleter associated with a particular type
-// and role, and registration is automatic. In a sense, this is
-// a small dependency injection infrastructure, because linking
-// in new deleter instantiations is essentially sufficient for
-// making stats collection (using CopyCacheDeleterRoleMap) aware
-// of them.
-
-namespace cache_entry_roles_detail {
-
-template <typename T, CacheEntryRole R>
-struct RegisteredDeleter {
-  RegisteredDeleter() { RegisterCacheDeleterRole(Delete, R); }
-
-  // These have global linkage to help ensure compiler optimizations do not
-  // break uniqueness for each <T,R>
-  static void Delete(const Slice& /* key */, void* value) {
-    // Supports T == Something[], unlike delete operator
-    std::default_delete<T>()(
-        static_cast<typename std::remove_extent<T>::type*>(value));
-  }
-};
-
-template <CacheEntryRole R>
-struct RegisteredNoopDeleter {
-  RegisteredNoopDeleter() { RegisterCacheDeleterRole(Delete, R); }
-
-  static void Delete(const Slice& /* key */, void* /* value */) {
-    // Here was `assert(value == nullptr);` but we can also put pointers
-    // to static data in Cache, for testing at least.
-  }
-};
-
-}  // namespace cache_entry_roles_detail
-
-// Get an automatically registered deleter for value type T and role R.
-// Based on C++ semantics, registration is invoked exactly once in a
-// thread-safe way on first call to this function, for each <T, R>.
-template <typename T, CacheEntryRole R>
-Cache::DeleterFn GetCacheEntryDeleterForRole() {
-  static cache_entry_roles_detail::RegisteredDeleter<T, R> reg;
-  return reg.Delete;
-}
-
-// Get an automatically registered no-op deleter (value should be nullptr)
-// and associated with role R. This is used for Cache "reservation" entries
-// such as for WriteBufferManager.
-template <CacheEntryRole R>
-Cache::DeleterFn GetNoopDeleterForRole() {
-  static cache_entry_roles_detail::RegisteredNoopDeleter<R> reg;
-  return reg.Delete;
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,181 +0,0 @@
-//  Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <array>
-#include <cstdint>
-#include <memory>
-#include <mutex>
-
-#include "cache/cache_helpers.h"
-#include "port/lang.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/status.h"
-#include "rocksdb/system_clock.h"
-#include "test_util/sync_point.h"
-#include "util/coding_lean.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// A generic helper object for gathering stats about cache entries by
-// iterating over them with ApplyToAllEntries. This class essentially
-// solves the problem of slowing down a Cache with too many stats
-// collectors that could be sharing stat results, such as from multiple
-// column families or multiple DBs sharing a Cache. We employ a few
-// mitigations:
-// * Only one collector for a particular kind of Stats is alive
-// for each Cache. This is guaranteed using the Cache itself to hold
-// the collector.
-// * A mutex ensures only one thread is gathering stats for this
-// collector.
-// * The most recent gathered stats are saved and simply copied to
-// satisfy requests within a time window (default: 3 minutes) of
-// completion of the most recent stat gathering.
-//
-// Template parameter Stats must be copyable and trivially constructable,
-// as well as...
-// concept Stats {
-//   // Notification before applying callback to all entries
-//   void BeginCollection(Cache*, SystemClock*, uint64_t start_time_micros);
-//   // Get the callback to apply to all entries. `callback`
-//   // type must be compatible with Cache::ApplyToAllEntries
-//   callback GetEntryCallback();
-//   // Notification after applying callback to all entries
-//   void EndCollection(Cache*, SystemClock*, uint64_t end_time_micros);
-//   // Notification that a collection was skipped because of
-//   // sufficiently recent saved results.
-//   void SkippedCollection();
-// }
-template <class Stats>
-class CacheEntryStatsCollector {
- public:
-  // Gather and save stats if saved stats are too old. (Use GetStats() to
-  // read saved stats.)
-  //
-  // Maximum allowed age for a "hit" on saved results is determined by the
-  // two interval parameters. Both set to 0 forces a re-scan. For example
-  // with min_interval_seconds=300 and min_interval_factor=100, if the last
-  // scan took 10s, we would only rescan ("miss") if the age in seconds of
-  // the saved results is > max(300, 100*10).
-  // Justification: scans can vary wildly in duration, e.g. from 0.02 sec
-  // to as much as 20 seconds, so we want to be able to cap the absolute
-  // and relative frequency of scans.
-  void CollectStats(int min_interval_seconds, int min_interval_factor) {
-    // Waits for any pending reader or writer (collector)
-    std::lock_guard<std::mutex> lock(working_mutex_);
-
-    uint64_t max_age_micros =
-        static_cast<uint64_t>(std::max(min_interval_seconds, 0)) * 1000000U;
-
-    if (last_end_time_micros_ > last_start_time_micros_ &&
-        min_interval_factor > 0) {
-      max_age_micros = std::max(
-          max_age_micros, min_interval_factor * (last_end_time_micros_ -
-                                                 last_start_time_micros_));
-    }
-
-    uint64_t start_time_micros = clock_->NowMicros();
-    if ((start_time_micros - last_end_time_micros_) > max_age_micros) {
-      last_start_time_micros_ = start_time_micros;
-      working_stats_.BeginCollection(cache_, clock_, start_time_micros);
-
-      cache_->ApplyToAllEntries(working_stats_.GetEntryCallback(), {});
-      TEST_SYNC_POINT_CALLBACK(
-          "CacheEntryStatsCollector::GetStats:AfterApplyToAllEntries", nullptr);
-
-      uint64_t end_time_micros = clock_->NowMicros();
-      last_end_time_micros_ = end_time_micros;
-      working_stats_.EndCollection(cache_, clock_, end_time_micros);
-    } else {
-      working_stats_.SkippedCollection();
-    }
-
-    // Save so that we don't need to wait for an outstanding collection in
-    // order to make of copy of the last saved stats
-    std::lock_guard<std::mutex> lock2(saved_mutex_);
-    saved_stats_ = working_stats_;
-  }
-
-  // Gets saved stats, regardless of age
-  void GetStats(Stats *stats) {
-    std::lock_guard<std::mutex> lock(saved_mutex_);
-    *stats = saved_stats_;
-  }
-
-  Cache *GetCache() const { return cache_; }
-
-  // Gets or creates a shared instance of CacheEntryStatsCollector in the
-  // cache itself, and saves into `ptr`. This shared_ptr will hold the
-  // entry in cache until all refs are destroyed.
-  static Status GetShared(Cache *cache, SystemClock *clock,
-                          std::shared_ptr<CacheEntryStatsCollector> *ptr) {
-    std::array<uint64_t, 3> cache_key_data{
-        {// First 16 bytes == md5 of class name
-         0x7eba5a8fb5437c90U, 0x8ca68c9b11655855U,
-         // Last 8 bytes based on a function pointer to make unique for each
-         // template instantiation
-         reinterpret_cast<uint64_t>(&CacheEntryStatsCollector::GetShared)}};
-    Slice cache_key = GetSlice(&cache_key_data);
-
-    Cache::Handle *h = cache->Lookup(cache_key);
-    if (h == nullptr) {
-      // Not yet in cache, but Cache doesn't provide a built-in way to
-      // avoid racing insert. So we double-check under a shared mutex,
-      // inspired by TableCache.
-      STATIC_AVOID_DESTRUCTION(std::mutex, static_mutex);
-      std::lock_guard<std::mutex> lock(static_mutex);
-
-      h = cache->Lookup(cache_key);
-      if (h == nullptr) {
-        auto new_ptr = new CacheEntryStatsCollector(cache, clock);
-        // TODO: non-zero charge causes some tests that count block cache
-        // usage to go flaky. Fix the problem somehow so we can use an
-        // accurate charge.
-        size_t charge = 0;
-        Status s = cache->Insert(cache_key, new_ptr, charge, Deleter, &h,
-                                 Cache::Priority::HIGH);
-        if (!s.ok()) {
-          assert(h == nullptr);
-          delete new_ptr;
-          return s;
-        }
-      }
-    }
-    // If we reach here, shared entry is in cache with handle `h`.
-    assert(cache->GetDeleter(h) == Deleter);
-
-    // Build an aliasing shared_ptr that keeps `ptr` in cache while there
-    // are references.
-    *ptr = MakeSharedCacheHandleGuard<CacheEntryStatsCollector>(cache, h);
-    return Status::OK();
-  }
-
- private:
-  explicit CacheEntryStatsCollector(Cache *cache, SystemClock *clock)
-      : saved_stats_(),
-        working_stats_(),
-        last_start_time_micros_(0),
-        last_end_time_micros_(/*pessimistic*/ 10000000),
-        cache_(cache),
-        clock_(clock) {}
-
-  static void Deleter(const Slice &, void *value) {
-    delete static_cast<CacheEntryStatsCollector *>(value);
-  }
-
-  std::mutex saved_mutex_;
-  Stats saved_stats_;
-
-  std::mutex working_mutex_;
-  Stats working_stats_;
-  uint64_t last_start_time_micros_;
-  uint64_t last_end_time_micros_;
-
-  Cache *const cache_;
-  SystemClock *const clock_;
-};
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,125 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <cassert>
-
-#include "rocksdb/cache.h"
-#include "rocksdb/rocksdb_namespace.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// Returns the cached value given a cache handle.
-template <typename T>
-T* GetFromCacheHandle(Cache* cache, Cache::Handle* handle) {
-  assert(cache);
-  assert(handle);
-
-  return static_cast<T*>(cache->Value(handle));
-}
-
-// Simple generic deleter for Cache (to be used with Cache::Insert).
-template <typename T>
-void DeleteCacheEntry(const Slice& /* key */, void* value) {
-  delete static_cast<T*>(value);
-}
-
-// Turns a T* into a Slice so it can be used as a key with Cache.
-template <typename T>
-Slice GetSlice(const T* t) {
-  return Slice(reinterpret_cast<const char*>(t), sizeof(T));
-}
-
-// Generic resource management object for cache handles that releases the handle
-// when destroyed. Has unique ownership of the handle, so copying it is not
-// allowed, while moving it transfers ownership.
-template <typename T>
-class CacheHandleGuard {
- public:
-  CacheHandleGuard() = default;
-
-  CacheHandleGuard(Cache* cache, Cache::Handle* handle)
-      : cache_(cache),
-        handle_(handle),
-        value_(GetFromCacheHandle<T>(cache, handle)) {
-    assert(cache_ && handle_ && value_);
-  }
-
-  CacheHandleGuard(const CacheHandleGuard&) = delete;
-  CacheHandleGuard& operator=(const CacheHandleGuard&) = delete;
-
-  CacheHandleGuard(CacheHandleGuard&& rhs) noexcept
-      : cache_(rhs.cache_), handle_(rhs.handle_), value_(rhs.value_) {
-    assert((!cache_ && !handle_ && !value_) || (cache_ && handle_ && value_));
-
-    rhs.ResetFields();
-  }
-
-  CacheHandleGuard& operator=(CacheHandleGuard&& rhs) noexcept {
-    if (this == &rhs) {
-      return *this;
-    }
-
-    ReleaseHandle();
-
-    cache_ = rhs.cache_;
-    handle_ = rhs.handle_;
-    value_ = rhs.value_;
-
-    assert((!cache_ && !handle_ && !value_) || (cache_ && handle_ && value_));
-
-    rhs.ResetFields();
-
-    return *this;
-  }
-
-  ~CacheHandleGuard() { ReleaseHandle(); }
-
-  bool IsEmpty() const { return !handle_; }
-
-  Cache* GetCache() const { return cache_; }
-  Cache::Handle* GetCacheHandle() const { return handle_; }
-  T* GetValue() const { return value_; }
-
-  void Reset() {
-    ReleaseHandle();
-    ResetFields();
-  }
-
- private:
-  void ReleaseHandle() {
-    if (IsEmpty()) {
-      return;
-    }
-
-    assert(cache_);
-    cache_->Release(handle_);
-  }
-
-  void ResetFields() {
-    cache_ = nullptr;
-    handle_ = nullptr;
-    value_ = nullptr;
-  }
-
- private:
-  Cache* cache_ = nullptr;
-  Cache::Handle* handle_ = nullptr;
-  T* value_ = nullptr;
-};
-
-// Build an aliasing shared_ptr that keeps `handle` in cache while there
-// are references, but the pointer is to the value for that cache entry,
-// which must be of type T. This is copyable, unlike CacheHandleGuard, but
-// does not provide access to caching details.
-template <typename T>
-std::shared_ptr<T> MakeSharedCacheHandleGuard(Cache* cache,
-                                              Cache::Handle* handle) {
-  auto wrapper = std::make_shared<CacheHandleGuard<T>>(cache, handle);
-  return std::shared_ptr<T>(wrapper, static_cast<T*>(cache->Value(handle)));
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,192 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-#include "cache/cache_reservation_manager.h"
-
-#include <cassert>
-#include <cstddef>
-#include <cstring>
-#include <memory>
-
-#include "cache/cache_entry_roles.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/slice.h"
-#include "rocksdb/status.h"
-#include "table/block_based/block_based_table_reader.h"
-#include "util/coding.h"
-
-namespace ROCKSDB_NAMESPACE {
-CacheReservationManager::CacheReservationManager(std::shared_ptr<Cache> cache,
-                                                 bool delayed_decrease)
-    : delayed_decrease_(delayed_decrease),
-      cache_allocated_size_(0),
-      memory_used_(0) {
-  assert(cache != nullptr);
-  cache_ = cache;
-  std::memset(cache_key_, 0, kCacheKeyPrefixSize + kMaxVarint64Length);
-  EncodeVarint64(cache_key_, cache_->NewId());
-}
-
-CacheReservationManager::~CacheReservationManager() {
-  for (auto* handle : dummy_handles_) {
-    cache_->Release(handle, true);
-  }
-}
-
-template <CacheEntryRole R>
-Status CacheReservationManager::UpdateCacheReservation(
-    std::size_t new_mem_used) {
-  memory_used_ = new_mem_used;
-  std::size_t cur_cache_allocated_size =
-      cache_allocated_size_.load(std::memory_order_relaxed);
-  if (new_mem_used == cur_cache_allocated_size) {
-    return Status::OK();
-  } else if (new_mem_used > cur_cache_allocated_size) {
-    Status s = IncreaseCacheReservation<R>(new_mem_used);
-    return s;
-  } else {
-    // In delayed decrease mode, we don't decrease cache reservation
-    // untill the memory usage is less than 3/4 of what we reserve
-    // in the cache.
-    // We do this because
-    // (1) Dummy entry insertion is expensive in block cache
-    // (2) Delayed releasing previously inserted dummy entries can save such
-    // expensive dummy entry insertion on memory increase in the near future,
-    // which is likely to happen when the memory usage is greater than or equal
-    // to 3/4 of what we reserve
-    if (delayed_decrease_ && new_mem_used >= cur_cache_allocated_size / 4 * 3) {
-      return Status::OK();
-    } else {
-      Status s = DecreaseCacheReservation(new_mem_used);
-      return s;
-    }
-  }
-}
-
-// Explicitly instantiate templates for "CacheEntryRole" values we use.
-// This makes it possible to keep the template definitions in the .cc file.
-template Status CacheReservationManager::UpdateCacheReservation<
-    CacheEntryRole::kWriteBuffer>(std::size_t new_mem_used);
-template Status CacheReservationManager::UpdateCacheReservation<
-    CacheEntryRole::kCompressionDictionaryBuildingBuffer>(
-    std::size_t new_mem_used);
-// For cache reservation manager unit tests
-template Status CacheReservationManager::UpdateCacheReservation<
-    CacheEntryRole::kMisc>(std::size_t new_mem_used);
-
-template <CacheEntryRole R>
-Status CacheReservationManager::MakeCacheReservation(
-    std::size_t incremental_memory_used,
-    std::unique_ptr<CacheReservationHandle<R>>* handle) {
-  assert(handle != nullptr);
-  Status s =
-      UpdateCacheReservation<R>(GetTotalMemoryUsed() + incremental_memory_used);
-  (*handle).reset(new CacheReservationHandle<R>(incremental_memory_used,
-                                                shared_from_this()));
-  return s;
-}
-
-template Status
-CacheReservationManager::MakeCacheReservation<CacheEntryRole::kMisc>(
-    std::size_t incremental_memory_used,
-    std::unique_ptr<CacheReservationHandle<CacheEntryRole::kMisc>>* handle);
-template Status CacheReservationManager::MakeCacheReservation<
-    CacheEntryRole::kFilterConstruction>(
-    std::size_t incremental_memory_used,
-    std::unique_ptr<
-        CacheReservationHandle<CacheEntryRole::kFilterConstruction>>* handle);
-
-template <CacheEntryRole R>
-Status CacheReservationManager::IncreaseCacheReservation(
-    std::size_t new_mem_used) {
-  Status return_status = Status::OK();
-  while (new_mem_used > cache_allocated_size_.load(std::memory_order_relaxed)) {
-    Cache::Handle* handle = nullptr;
-    return_status = cache_->Insert(GetNextCacheKey(), nullptr, kSizeDummyEntry,
-                                   GetNoopDeleterForRole<R>(), &handle);
-
-    if (return_status != Status::OK()) {
-      return return_status;
-    }
-
-    dummy_handles_.push_back(handle);
-    cache_allocated_size_ += kSizeDummyEntry;
-  }
-  return return_status;
-}
-
-Status CacheReservationManager::DecreaseCacheReservation(
-    std::size_t new_mem_used) {
-  Status return_status = Status::OK();
-
-  // Decrease to the smallest multiple of kSizeDummyEntry that is greater than
-  // or equal to new_mem_used We do addition instead of new_mem_used <=
-  // cache_allocated_size_.load(std::memory_order_relaxed) - kSizeDummyEntry to
-  // avoid underflow of size_t when cache_allocated_size_ = 0
-  while (new_mem_used + kSizeDummyEntry <=
-         cache_allocated_size_.load(std::memory_order_relaxed)) {
-    assert(!dummy_handles_.empty());
-    auto* handle = dummy_handles_.back();
-    cache_->Release(handle, true);
-    dummy_handles_.pop_back();
-    cache_allocated_size_ -= kSizeDummyEntry;
-  }
-  return return_status;
-}
-
-std::size_t CacheReservationManager::GetTotalReservedCacheSize() {
-  return cache_allocated_size_.load(std::memory_order_relaxed);
-}
-
-std::size_t CacheReservationManager::GetTotalMemoryUsed() {
-  return memory_used_;
-}
-
-Slice CacheReservationManager::GetNextCacheKey() {
-  // Calling this function will have the side-effect of changing the
-  // underlying cache_key_ that is shared among other keys generated from this
-  // fucntion. Therefore please make sure the previous keys are saved/copied
-  // before calling this function.
-  std::memset(cache_key_ + kCacheKeyPrefixSize, 0, kMaxVarint64Length);
-  char* end =
-      EncodeVarint64(cache_key_ + kCacheKeyPrefixSize, next_cache_key_id_++);
-  return Slice(cache_key_, static_cast<std::size_t>(end - cache_key_));
-}
-
-template <CacheEntryRole R>
-Cache::DeleterFn CacheReservationManager::TEST_GetNoopDeleterForRole() {
-  return GetNoopDeleterForRole<R>();
-}
-
-template Cache::DeleterFn CacheReservationManager::TEST_GetNoopDeleterForRole<
-    CacheEntryRole::kFilterConstruction>();
-
-template <CacheEntryRole R>
-CacheReservationHandle<R>::CacheReservationHandle(
-    std::size_t incremental_memory_used,
-    std::shared_ptr<CacheReservationManager> cache_res_mgr)
-    : incremental_memory_used_(incremental_memory_used) {
-  assert(cache_res_mgr != nullptr);
-  cache_res_mgr_ = cache_res_mgr;
-}
-
-template <CacheEntryRole R>
-CacheReservationHandle<R>::~CacheReservationHandle() {
-  assert(cache_res_mgr_ != nullptr);
-  assert(cache_res_mgr_->GetTotalMemoryUsed() >= incremental_memory_used_);
-
-  Status s = cache_res_mgr_->UpdateCacheReservation<R>(
-      cache_res_mgr_->GetTotalMemoryUsed() - incremental_memory_used_);
-  s.PermitUncheckedError();
-}
-
-// Explicitly instantiate templates for "CacheEntryRole" values we use.
-// This makes it possible to keep the template definitions in the .cc file.
-template class CacheReservationHandle<CacheEntryRole::kMisc>;
-template class CacheReservationHandle<CacheEntryRole::kFilterConstruction>;
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,197 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#pragma once
-
-#include <atomic>
-#include <cstddef>
-#include <cstdint>
-#include <memory>
-#include <vector>
-
-#include "cache/cache_entry_roles.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/slice.h"
-#include "rocksdb/status.h"
-#include "table/block_based/block_based_table_reader.h"
-#include "util/coding.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-template <CacheEntryRole R>
-class CacheReservationHandle;
-
-// CacheReservationManager is for reserving cache space for the memory used
-// through inserting/releasing dummy entries in the cache.
-//
-// This class is NOT thread-safe, except that GetTotalReservedCacheSize()
-// can be called without external synchronization.
-class CacheReservationManager
-    : public std::enable_shared_from_this<CacheReservationManager> {
- public:
-  // Construct a CacheReservationManager
-  // @param cache The cache where dummy entries are inserted and released for
-  // reserving cache space
-  // @param delayed_decrease If set true, then dummy entries won't be released
-  // immediately when memory usage decreases.
-  //                         Instead, it will be released when the memory usage
-  //                         decreases to 3/4 of what we have reserved so far.
-  //                         This is for saving some future dummy entry
-  //                         insertion when memory usage increases are likely to
-  //                         happen in the near future.
-  explicit CacheReservationManager(std::shared_ptr<Cache> cache,
-                                   bool delayed_decrease = false);
-
-  // no copy constructor, copy assignment, move constructor, move assignment
-  CacheReservationManager(const CacheReservationManager &) = delete;
-  CacheReservationManager &operator=(const CacheReservationManager &) = delete;
-  CacheReservationManager(CacheReservationManager &&) = delete;
-  CacheReservationManager &operator=(CacheReservationManager &&) = delete;
-
-  ~CacheReservationManager();
-
-  template <CacheEntryRole R>
-
-  // One of the two ways of reserving/releasing cache,
-  // see CacheReservationManager::MakeCacheReservation() for the other.
-  // Use ONLY one of them to prevent unexpected behavior.
-  //
-  // Insert and release dummy entries in the cache to
-  // match the size of total dummy entries with the least multiple of
-  // kSizeDummyEntry greater than or equal to new_mem_used
-  //
-  // Insert dummy entries if new_memory_used > cache_allocated_size_;
-  //
-  // Release dummy entries if new_memory_used < cache_allocated_size_
-  // (and new_memory_used < cache_allocated_size_ * 3/4
-  // when delayed_decrease is set true);
-  //
-  // Keey dummy entries the same if (1) new_memory_used == cache_allocated_size_
-  // or (2) new_memory_used is in the interval of
-  // [cache_allocated_size_ * 3/4, cache_allocated_size) when delayed_decrease
-  // is set true.
-  //
-  // @param new_memory_used The number of bytes used by new memory
-  //        The most recent new_memoy_used passed in will be returned
-  //        in GetTotalMemoryUsed() even when the call return non-ok status.
-  //
-  //        Since the class is NOT thread-safe, external synchronization on the
-  //        order of calling UpdateCacheReservation() is needed if you want
-  //        GetTotalMemoryUsed() indeed returns the latest memory used.
-  //
-  // @return On inserting dummy entries, it returns Status::OK() if all dummy
-  //         entry insertions succeed.
-  //         Otherwise, it returns the first non-ok status;
-  //         On releasing dummy entries, it always returns Status::OK().
-  //         On keeping dummy entries the same, it always returns Status::OK().
-  Status UpdateCacheReservation(std::size_t new_memory_used);
-
-  // One of the two ways of reserving/releasing cache,
-  // see CacheReservationManager::UpdateCacheReservation() for the other.
-  // Use ONLY one of them to prevent unexpected behavior.
-  //
-  // Insert dummy entries in the cache for the incremental memory usage
-  // to match the size of total dummy entries with the least multiple of
-  // kSizeDummyEntry greater than or equal to the total memory used.
-  //
-  // A CacheReservationHandle is returned as an output parameter.
-  // The reserved dummy entries are automatically released on the destruction of
-  // this handle, which achieves better RAII per cache reservation.
-  //
-  // WARNING: Deallocate all the handles of the CacheReservationManager object
-  //          before deallocating the object to prevent unexpected behavior.
-  //
-  // @param incremental_memory_used The number of bytes increased in memory
-  //        usage.
-  //
-  //        Calling GetTotalMemoryUsed() afterward will return the total memory
-  //        increased by this number, even when calling MakeCacheReservation()
-  //        returns non-ok status.
-  //
-  //        Since the class is NOT thread-safe, external synchronization in
-  //        calling MakeCacheReservation() is needed if you want
-  //        GetTotalMemoryUsed() indeed returns the latest memory used.
-  //
-  // @param handle An pointer to std::unique_ptr<CacheReservationHandle<R>> that
-  //        manages the lifetime of the handle and its cache reservation.
-  //
-  // @return It returns Status::OK() if all dummy
-  //         entry insertions succeed.
-  //         Otherwise, it returns the first non-ok status;
-  //
-  // REQUIRES: handle != nullptr
-  // REQUIRES: The CacheReservationManager object is NOT managed by
-  //           std::unique_ptr as CacheReservationHandle needs to
-  //           shares ownership to the CacheReservationManager object.
-  template <CacheEntryRole R>
-  Status MakeCacheReservation(
-      std::size_t incremental_memory_used,
-      std::unique_ptr<CacheReservationHandle<R>> *handle);
-
-  // Return the size of the cache (which is a multiple of kSizeDummyEntry)
-  // successfully reserved by calling UpdateCacheReservation().
-  //
-  // When UpdateCacheReservation() returns non-ok status,
-  // calling GetTotalReservedCacheSize() after that might return a slightly
-  // smaller number than the actual reserved cache size due to
-  // the returned number will always be a multiple of kSizeDummyEntry
-  // and cache full might happen in the middle of inserting a dummy entry.
-  std::size_t GetTotalReservedCacheSize();
-
-  // Return the latest total memory used indicated by the most recent call of
-  // UpdateCacheReservation(std::size_t new_memory_used);
-  std::size_t GetTotalMemoryUsed();
-
-  static constexpr std::size_t GetDummyEntrySize() { return kSizeDummyEntry; }
-
-  // For testing only - it is to help ensure the NoopDeleterForRole<R>
-  // accessed from CacheReservationManager and the one accessed from the test
-  // are from the same translation units
-  template <CacheEntryRole R>
-  static Cache::DeleterFn TEST_GetNoopDeleterForRole();
-
- private:
-  static constexpr std::size_t kSizeDummyEntry = 256 * 1024;
-  // The key will be longer than keys for blocks in SST files so they won't
-  // conflict.
-  static const std::size_t kCacheKeyPrefixSize =
-      BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length;
-
-  Slice GetNextCacheKey();
-  template <CacheEntryRole R>
-  Status IncreaseCacheReservation(std::size_t new_mem_used);
-  Status DecreaseCacheReservation(std::size_t new_mem_used);
-
-  std::shared_ptr<Cache> cache_;
-  bool delayed_decrease_;
-  std::atomic<std::size_t> cache_allocated_size_;
-  std::size_t memory_used_;
-  std::vector<Cache::Handle *> dummy_handles_;
-  std::uint64_t next_cache_key_id_ = 0;
-  // The non-prefix part will be updated according to the ID to use.
-  char cache_key_[kCacheKeyPrefixSize + kMaxVarint64Length];
-};
-
-// CacheReservationHandle is for managing the lifetime of a cache reservation
-// This class is NOT thread-safe
-template <CacheEntryRole R>
-class CacheReservationHandle {
- public:
-  // REQUIRES: cache_res_mgr != nullptr
-  explicit CacheReservationHandle(
-      std::size_t incremental_memory_used,
-      std::shared_ptr<CacheReservationManager> cache_res_mgr);
-
-  ~CacheReservationHandle();
-
- private:
-  std::size_t incremental_memory_used_;
-  std::shared_ptr<CacheReservationManager> cache_res_mgr_;
-};
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,514 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-#include "cache/cache_reservation_manager.h"
-
-#include <cstddef>
-#include <cstring>
-#include <memory>
-
-#include "cache/cache_entry_roles.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/slice.h"
-#include "table/block_based/block_based_table_reader.h"
-#include "test_util/testharness.h"
-#include "util/coding.h"
-
-namespace ROCKSDB_NAMESPACE {
-class CacheReservationManagerTest : public ::testing::Test {
- protected:
-  static constexpr std::size_t kSizeDummyEntry =
-      CacheReservationManager::GetDummyEntrySize();
-  static constexpr std::size_t kCacheCapacity = 4096 * kSizeDummyEntry;
-  static constexpr int kNumShardBits = 0;  // 2^0 shard
-  static const std::size_t kCacheKeyPrefixSize =
-      BlockBasedTable::kMaxCacheKeyPrefixSize + kMaxVarint64Length;
-  static constexpr std::size_t kMetaDataChargeOverhead = 10000;
-
-  std::shared_ptr<Cache> cache = NewLRUCache(kCacheCapacity, kNumShardBits);
-  std::unique_ptr<CacheReservationManager> test_cache_rev_mng;
-
-  CacheReservationManagerTest() {
-    test_cache_rev_mng.reset(new CacheReservationManager(cache));
-  }
-};
-
-TEST_F(CacheReservationManagerTest, GenerateCacheKey) {
-  // The first cache reservation manager owning the cache will have
-  // cache->NewId() = 1
-  constexpr std::size_t kCacheNewId = 1;
-  // The first key generated inside of cache reservation manager will have
-  // next_cache_key_id = 0
-  constexpr std::size_t kCacheKeyId = 0;
-
-  char expected_cache_key[kCacheKeyPrefixSize + kMaxVarint64Length];
-  std::memset(expected_cache_key, 0, kCacheKeyPrefixSize + kMaxVarint64Length);
-
-  EncodeVarint64(expected_cache_key, kCacheNewId);
-  char* end =
-      EncodeVarint64(expected_cache_key + kCacheKeyPrefixSize, kCacheKeyId);
-  Slice expected_cache_key_slice(
-      expected_cache_key, static_cast<std::size_t>(end - expected_cache_key));
-
-  std::size_t new_mem_used = 1 * kSizeDummyEntry;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  ASSERT_EQ(s, Status::OK());
-  ASSERT_GE(cache->GetPinnedUsage(), 1 * kSizeDummyEntry);
-  ASSERT_LT(cache->GetPinnedUsage(),
-            1 * kSizeDummyEntry + kMetaDataChargeOverhead);
-
-  Cache::Handle* handle = cache->Lookup(expected_cache_key_slice);
-  EXPECT_NE(handle, nullptr)
-      << "Failed to generate the cache key for the dummy entry correctly";
-  // Clean up the returned handle from Lookup() to prevent memory leak
-  cache->Release(handle);
-}
-
-TEST_F(CacheReservationManagerTest, KeepCacheReservationTheSame) {
-  std::size_t new_mem_used = 1 * kSizeDummyEntry;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  ASSERT_EQ(s, Status::OK());
-  ASSERT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            1 * kSizeDummyEntry);
-  ASSERT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used);
-  std::size_t initial_pinned_usage = cache->GetPinnedUsage();
-  ASSERT_GE(initial_pinned_usage, 1 * kSizeDummyEntry);
-  ASSERT_LT(initial_pinned_usage,
-            1 * kSizeDummyEntry + kMetaDataChargeOverhead);
-
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to keep cache reservation the same when new_mem_used equals "
-         "to current cache reservation";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            1 * kSizeDummyEntry)
-      << "Failed to bookkeep correctly when new_mem_used equals to current "
-         "cache reservation";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly when new_mem_used "
-         "equals to current cache reservation";
-  EXPECT_EQ(cache->GetPinnedUsage(), initial_pinned_usage)
-      << "Failed to keep underlying dummy entries the same when new_mem_used "
-         "equals to current cache reservation";
-}
-
-TEST_F(CacheReservationManagerTest,
-       IncreaseCacheReservationByMultiplesOfDummyEntrySize) {
-  std::size_t new_mem_used = 2 * kSizeDummyEntry;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to increase cache reservation correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            2 * kSizeDummyEntry)
-      << "Failed to bookkeep cache reservation increase correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 2 * kSizeDummyEntry)
-      << "Failed to increase underlying dummy entries in cache correctly";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            2 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to increase underlying dummy entries in cache correctly";
-}
-
-TEST_F(CacheReservationManagerTest,
-       IncreaseCacheReservationNotByMultiplesOfDummyEntrySize) {
-  std::size_t new_mem_used = 2 * kSizeDummyEntry + kSizeDummyEntry / 2;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to increase cache reservation correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            3 * kSizeDummyEntry)
-      << "Failed to bookkeep cache reservation increase correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 3 * kSizeDummyEntry)
-      << "Failed to increase underlying dummy entries in cache correctly";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            3 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to increase underlying dummy entries in cache correctly";
-}
-
-TEST(CacheReservationManagerIncreaseReservcationOnFullCacheTest,
-     IncreaseCacheReservationOnFullCache) {
-  ;
-  constexpr std::size_t kSizeDummyEntry =
-      CacheReservationManager::GetDummyEntrySize();
-  constexpr std::size_t kSmallCacheCapacity = 4 * kSizeDummyEntry;
-  constexpr std::size_t kBigCacheCapacity = 4096 * kSizeDummyEntry;
-  constexpr std::size_t kMetaDataChargeOverhead = 10000;
-
-  LRUCacheOptions lo;
-  lo.capacity = kSmallCacheCapacity;
-  lo.num_shard_bits = 0;  // 2^0 shard
-  lo.strict_capacity_limit = true;
-  std::shared_ptr<Cache> cache = NewLRUCache(lo);
-  std::unique_ptr<CacheReservationManager> test_cache_rev_mng(
-      new CacheReservationManager(cache));
-
-  std::size_t new_mem_used = kSmallCacheCapacity + 1;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::Incomplete())
-      << "Failed to return status to indicate failure of dummy entry insertion "
-         "during cache reservation on full cache";
-  EXPECT_GE(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            1 * kSizeDummyEntry)
-      << "Failed to bookkeep correctly before cache resevation failure happens "
-         "due to full cache";
-  EXPECT_LE(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            kSmallCacheCapacity)
-      << "Failed to bookkeep correctly (i.e, bookkeep only successful dummy "
-         "entry insertions) when encountering cache resevation failure due to "
-         "full cache";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 1 * kSizeDummyEntry)
-      << "Failed to insert underlying dummy entries correctly when "
-         "encountering cache resevation failure due to full cache";
-  EXPECT_LE(cache->GetPinnedUsage(), kSmallCacheCapacity)
-      << "Failed to insert underlying dummy entries correctly when "
-         "encountering cache resevation failure due to full cache";
-
-  new_mem_used = kSmallCacheCapacity / 2;  // 2 dummy entries
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to decrease cache reservation after encountering cache "
-         "reservation failure due to full cache";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            2 * kSizeDummyEntry)
-      << "Failed to bookkeep cache reservation decrease correctly after "
-         "encountering cache reservation due to full cache";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 2 * kSizeDummyEntry)
-      << "Failed to release underlying dummy entries correctly on cache "
-         "reservation decrease after encountering cache resevation failure due "
-         "to full cache";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            2 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to release underlying dummy entries correctly on cache "
-         "reservation decrease after encountering cache resevation failure due "
-         "to full cache";
-
-  // Create cache full again for subsequent tests
-  new_mem_used = kSmallCacheCapacity + 1;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::Incomplete())
-      << "Failed to return status to indicate failure of dummy entry insertion "
-         "during cache reservation on full cache";
-  EXPECT_GE(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            1 * kSizeDummyEntry)
-      << "Failed to bookkeep correctly before cache resevation failure happens "
-         "due to full cache";
-  EXPECT_LE(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            kSmallCacheCapacity)
-      << "Failed to bookkeep correctly (i.e, bookkeep only successful dummy "
-         "entry insertions) when encountering cache resevation failure due to "
-         "full cache";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 1 * kSizeDummyEntry)
-      << "Failed to insert underlying dummy entries correctly when "
-         "encountering cache resevation failure due to full cache";
-  EXPECT_LE(cache->GetPinnedUsage(), kSmallCacheCapacity)
-      << "Failed to insert underlying dummy entries correctly when "
-         "encountering cache resevation failure due to full cache";
-
-  // Increase cache capacity so the previously failed insertion can fully
-  // succeed
-  cache->SetCapacity(kBigCacheCapacity);
-  new_mem_used = kSmallCacheCapacity + 1;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to increase cache reservation after increasing cache capacity "
-         "and mitigating cache full error";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            5 * kSizeDummyEntry)
-      << "Failed to bookkeep cache reservation increase correctly after "
-         "increasing cache capacity and mitigating cache full error";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 5 * kSizeDummyEntry)
-      << "Failed to insert underlying dummy entries correctly after increasing "
-         "cache capacity and mitigating cache full error";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            5 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to insert underlying dummy entries correctly after increasing "
-         "cache capacity and mitigating cache full error";
-}
-
-TEST_F(CacheReservationManagerTest,
-       DecreaseCacheReservationByMultiplesOfDummyEntrySize) {
-  std::size_t new_mem_used = 2 * kSizeDummyEntry;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  ASSERT_EQ(s, Status::OK());
-  ASSERT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            2 * kSizeDummyEntry);
-  ASSERT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used);
-  ASSERT_GE(cache->GetPinnedUsage(), 2 * kSizeDummyEntry);
-  ASSERT_LT(cache->GetPinnedUsage(),
-            2 * kSizeDummyEntry + kMetaDataChargeOverhead);
-
-  new_mem_used = 1 * kSizeDummyEntry;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to decrease cache reservation correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            1 * kSizeDummyEntry)
-      << "Failed to bookkeep cache reservation decrease correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 1 * kSizeDummyEntry)
-      << "Failed to decrease underlying dummy entries in cache correctly";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            1 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to decrease underlying dummy entries in cache correctly";
-}
-
-TEST_F(CacheReservationManagerTest,
-       DecreaseCacheReservationNotByMultiplesOfDummyEntrySize) {
-  std::size_t new_mem_used = 2 * kSizeDummyEntry;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  ASSERT_EQ(s, Status::OK());
-  ASSERT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            2 * kSizeDummyEntry);
-  ASSERT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used);
-  ASSERT_GE(cache->GetPinnedUsage(), 2 * kSizeDummyEntry);
-  ASSERT_LT(cache->GetPinnedUsage(),
-            2 * kSizeDummyEntry + kMetaDataChargeOverhead);
-
-  new_mem_used = kSizeDummyEntry / 2;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to decrease cache reservation correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            1 * kSizeDummyEntry)
-      << "Failed to bookkeep cache reservation decrease correctly";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 1 * kSizeDummyEntry)
-      << "Failed to decrease underlying dummy entries in cache correctly";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            1 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to decrease underlying dummy entries in cache correctly";
-}
-
-TEST(CacheReservationManagerWithDelayedDecreaseTest,
-     DecreaseCacheReservationWithDelayedDecrease) {
-  constexpr std::size_t kSizeDummyEntry =
-      CacheReservationManager::GetDummyEntrySize();
-  constexpr std::size_t kCacheCapacity = 4096 * kSizeDummyEntry;
-  constexpr std::size_t kMetaDataChargeOverhead = 10000;
-
-  LRUCacheOptions lo;
-  lo.capacity = kCacheCapacity;
-  lo.num_shard_bits = 0;
-  std::shared_ptr<Cache> cache = NewLRUCache(lo);
-  std::unique_ptr<CacheReservationManager> test_cache_rev_mng(
-      new CacheReservationManager(cache, true /* delayed_decrease */));
-
-  std::size_t new_mem_used = 8 * kSizeDummyEntry;
-  Status s =
-      test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  ASSERT_EQ(s, Status::OK());
-  ASSERT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            8 * kSizeDummyEntry);
-  ASSERT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used);
-  std::size_t initial_pinned_usage = cache->GetPinnedUsage();
-  ASSERT_GE(initial_pinned_usage, 8 * kSizeDummyEntry);
-  ASSERT_LT(initial_pinned_usage,
-            8 * kSizeDummyEntry + kMetaDataChargeOverhead);
-
-  new_mem_used = 6 * kSizeDummyEntry;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK()) << "Failed to delay decreasing cache reservation";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            8 * kSizeDummyEntry)
-      << "Failed to bookkeep correctly when delaying cache reservation "
-         "decrease";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_EQ(cache->GetPinnedUsage(), initial_pinned_usage)
-      << "Failed to delay decreasing underlying dummy entries in cache";
-
-  new_mem_used = 7 * kSizeDummyEntry;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK()) << "Failed to delay decreasing cache reservation";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            8 * kSizeDummyEntry)
-      << "Failed to bookkeep correctly when delaying cache reservation "
-         "decrease";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_EQ(cache->GetPinnedUsage(), initial_pinned_usage)
-      << "Failed to delay decreasing underlying dummy entries in cache";
-
-  new_mem_used = 6 * kSizeDummyEntry - 1;
-  s = test_cache_rev_mng
-          ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-              new_mem_used);
-  EXPECT_EQ(s, Status::OK())
-      << "Failed to decrease cache reservation correctly when new_mem_used < "
-         "GetTotalReservedCacheSize() * 3 / 4 on delayed decrease mode";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(),
-            6 * kSizeDummyEntry)
-      << "Failed to bookkeep correctly when new_mem_used < "
-         "GetTotalReservedCacheSize() * 3 / 4 on delayed decrease mode";
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), new_mem_used)
-      << "Failed to bookkeep the used memory correctly";
-  EXPECT_GE(cache->GetPinnedUsage(), 6 * kSizeDummyEntry)
-      << "Failed to decrease underlying dummy entries in cache when "
-         "new_mem_used < GetTotalReservedCacheSize() * 3 / 4 on delayed "
-         "decrease mode";
-  EXPECT_LT(cache->GetPinnedUsage(),
-            6 * kSizeDummyEntry + kMetaDataChargeOverhead)
-      << "Failed to decrease underlying dummy entries in cache when "
-         "new_mem_used < GetTotalReservedCacheSize() * 3 / 4 on delayed "
-         "decrease mode";
-}
-
-TEST(CacheReservationManagerDestructorTest,
-     ReleaseRemainingDummyEntriesOnDestruction) {
-  constexpr std::size_t kSizeDummyEntry =
-      CacheReservationManager::GetDummyEntrySize();
-  constexpr std::size_t kCacheCapacity = 4096 * kSizeDummyEntry;
-  constexpr std::size_t kMetaDataChargeOverhead = 10000;
-
-  LRUCacheOptions lo;
-  lo.capacity = kCacheCapacity;
-  lo.num_shard_bits = 0;
-  std::shared_ptr<Cache> cache = NewLRUCache(lo);
-  {
-    std::unique_ptr<CacheReservationManager> test_cache_rev_mng(
-        new CacheReservationManager(cache));
-    std::size_t new_mem_used = 1 * kSizeDummyEntry;
-    Status s =
-        test_cache_rev_mng
-            ->UpdateCacheReservation<ROCKSDB_NAMESPACE::CacheEntryRole::kMisc>(
-                new_mem_used);
-    ASSERT_EQ(s, Status::OK());
-    ASSERT_GE(cache->GetPinnedUsage(), 1 * kSizeDummyEntry);
-    ASSERT_LT(cache->GetPinnedUsage(),
-              1 * kSizeDummyEntry + kMetaDataChargeOverhead);
-  }
-  EXPECT_EQ(cache->GetPinnedUsage(), 0 * kSizeDummyEntry)
-      << "Failed to release remaining underlying dummy entries in cache in "
-         "CacheReservationManager's destructor";
-}
-
-TEST(CacheReservationHandleTest, HandleTest) {
-  constexpr std::size_t kOneGigabyte = 1024 * 1024 * 1024;
-  constexpr std::size_t kSizeDummyEntry = 256 * 1024;
-  constexpr std::size_t kMetaDataChargeOverhead = 10000;
-
-  LRUCacheOptions lo;
-  lo.capacity = kOneGigabyte;
-  lo.num_shard_bits = 0;
-  std::shared_ptr<Cache> cache = NewLRUCache(lo);
-
-  std::shared_ptr<CacheReservationManager> test_cache_rev_mng(
-      std::make_shared<CacheReservationManager>(cache));
-
-  std::size_t mem_used = 0;
-  const std::size_t incremental_mem_used_handle_1 = 1 * kSizeDummyEntry;
-  const std::size_t incremental_mem_used_handle_2 = 2 * kSizeDummyEntry;
-  std::unique_ptr<CacheReservationHandle<CacheEntryRole::kMisc>> handle_1,
-      handle_2;
-
-  // To test consecutive CacheReservationManager::MakeCacheReservation works
-  // correctly in terms of returning the handle as well as updating cache
-  // reservation and the latest total memory used
-  Status s = test_cache_rev_mng->MakeCacheReservation<CacheEntryRole::kMisc>(
-      incremental_mem_used_handle_1, &handle_1);
-  mem_used = mem_used + incremental_mem_used_handle_1;
-  ASSERT_EQ(s, Status::OK());
-  EXPECT_TRUE(handle_1 != nullptr);
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(), mem_used);
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), mem_used);
-  EXPECT_GE(cache->GetPinnedUsage(), mem_used);
-  EXPECT_LT(cache->GetPinnedUsage(), mem_used + kMetaDataChargeOverhead);
-
-  s = test_cache_rev_mng->MakeCacheReservation<CacheEntryRole::kMisc>(
-      incremental_mem_used_handle_2, &handle_2);
-  mem_used = mem_used + incremental_mem_used_handle_2;
-  ASSERT_EQ(s, Status::OK());
-  EXPECT_TRUE(handle_2 != nullptr);
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(), mem_used);
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), mem_used);
-  EXPECT_GE(cache->GetPinnedUsage(), mem_used);
-  EXPECT_LT(cache->GetPinnedUsage(), mem_used + kMetaDataChargeOverhead);
-
-  // To test CacheReservationHandle::~CacheReservationHandle() works correctly
-  // in releasing the cache reserved for the handle
-  handle_1.reset();
-  EXPECT_TRUE(handle_1 == nullptr);
-  mem_used = mem_used - incremental_mem_used_handle_1;
-  EXPECT_EQ(test_cache_rev_mng->GetTotalReservedCacheSize(), mem_used);
-  EXPECT_EQ(test_cache_rev_mng->GetTotalMemoryUsed(), mem_used);
-  EXPECT_GE(cache->GetPinnedUsage(), mem_used);
-  EXPECT_LT(cache->GetPinnedUsage(), mem_used + kMetaDataChargeOverhead);
-
-  // To test the actual CacheReservationManager object won't be deallocated
-  // as long as there remain handles pointing to it.
-  // We strongly recommend deallocating CacheReservationManager object only
-  // after all its handles are deallocated to keep things easy to reasonate
-  test_cache_rev_mng.reset();
-  EXPECT_GE(cache->GetPinnedUsage(), mem_used);
-  EXPECT_LT(cache->GetPinnedUsage(), mem_used + kMetaDataChargeOverhead);
-
-  handle_2.reset();
-  // The CacheReservationManager object is now deallocated since all the handles
-  // and its original pointer is gone
-  mem_used = mem_used - incremental_mem_used_handle_2;
-  EXPECT_EQ(mem_used, 0);
-  EXPECT_EQ(cache->GetPinnedUsage(), mem_used);
-}
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -712,98 +712,25 @@ TEST_P(CacheTest, OverCapacity) {
 }

 namespace {
-std::vector<std::pair<int, int>> legacy_callback_state;
-void legacy_callback(void* value, size_t charge) {
-  legacy_callback_state.push_back(
-      {DecodeValue(value), static_cast<int>(charge)});
+std::vector<std::pair<int, int>> callback_state;
+void callback(void* entry, size_t charge) {
+  callback_state.push_back({DecodeValue(entry), static_cast<int>(charge)});
 }
 };

-TEST_P(CacheTest, ApplyToAllCacheEntriesTest) {
+TEST_P(CacheTest, ApplyToAllCacheEntiresTest) {
  std::vector<std::pair<int, int>> inserted;
-  legacy_callback_state.clear();
+  callback_state.clear();

  for (int i = 0; i < 10; ++i) {
    Insert(i, i * 2, i + 1);
    inserted.push_back({i * 2, i + 1});
  }
-  cache_->ApplyToAllCacheEntries(legacy_callback, true);
-
-  std::sort(inserted.begin(), inserted.end());
-  std::sort(legacy_callback_state.begin(), legacy_callback_state.end());
-  ASSERT_EQ(inserted.size(), legacy_callback_state.size());
-  for (size_t i = 0; i < inserted.size(); ++i) {
-    EXPECT_EQ(inserted[i], legacy_callback_state[i]);
-  }
-}
-
-TEST_P(CacheTest, ApplyToAllEntriesTest) {
-  std::vector<std::string> callback_state;
-  const auto callback = [&](const Slice& key, void* value, size_t charge,
-                            Cache::DeleterFn deleter) {
-    callback_state.push_back(ToString(DecodeKey(key)) + "," +
-                             ToString(DecodeValue(value)) + "," +
-                             ToString(charge));
-    assert(deleter == &CacheTest::Deleter);
-  };
-
-  std::vector<std::string> inserted;
-  callback_state.clear();
-
-  for (int i = 0; i < 10; ++i) {
-    Insert(i, i * 2, i + 1);
-    inserted.push_back(ToString(i) + "," + ToString(i * 2) + "," +
-                       ToString(i + 1));
-  }
-  cache_->ApplyToAllEntries(callback, /*opts*/ {});
+  cache_->ApplyToAllCacheEntries(callback, true);

  std::sort(inserted.begin(), inserted.end());
  std::sort(callback_state.begin(), callback_state.end());
-  ASSERT_EQ(inserted.size(), callback_state.size());
-  for (size_t i = 0; i < inserted.size(); ++i) {
-    EXPECT_EQ(inserted[i], callback_state[i]);
-  }
-}
-
-TEST_P(CacheTest, ApplyToAllEntriesDuringResize) {
-  // This is a mini-stress test of ApplyToAllEntries, to ensure
-  // items in the cache that are neither added nor removed
-  // during ApplyToAllEntries are counted exactly once.
-
-  // Insert some entries that we expect to be seen exactly once
-  // during iteration.
-  constexpr int kSpecialCharge = 2;
-  constexpr int kNotSpecialCharge = 1;
-  constexpr int kSpecialCount = 100;
-  for (int i = 0; i < kSpecialCount; ++i) {
-    Insert(i, i * 2, kSpecialCharge);
-  }
-
-  // For callback
-  int special_count = 0;
-  const auto callback = [&](const Slice&, void*, size_t charge,
-                            Cache::DeleterFn) {
-    if (charge == static_cast<size_t>(kSpecialCharge)) {
-      ++special_count;
-    }
-  };
-
-  // Start counting
-  std::thread apply_thread([&]() {
-    // Use small average_entries_per_lock to make the problem difficult
-    Cache::ApplyToAllEntriesOptions opts;
-    opts.average_entries_per_lock = 2;
-    cache_->ApplyToAllEntries(callback, opts);
-  });
-
-  // In parallel, add more entries, enough to cause resize but not enough
-  // to cause ejections
-  for (int i = kSpecialCount * 1; i < kSpecialCount * 6; ++i) {
-    Insert(i, i * 2, kNotSpecialCharge);
-  }
-
-  apply_thread.join();
-  ASSERT_EQ(special_count, kSpecialCount);
+  ASSERT_TRUE(inserted == callback_state);
 }

 TEST_P(CacheTest, DefaultShardBits) {
@@ -822,12 +749,11 @@ TEST_P(CacheTest, DefaultShardBits) {
  ASSERT_EQ(6, sc->GetNumShardBits());
 }

-TEST_P(CacheTest, GetChargeAndDeleter) {
+TEST_P(CacheTest, GetCharge) {
  Insert(1, 2);
  Cache::Handle* h1 = cache_->Lookup(EncodeKey(1));
  ASSERT_EQ(2, DecodeValue(cache_->Value(h1)));
  ASSERT_EQ(1, cache_->GetCharge(h1));
-  ASSERT_EQ(&CacheTest::Deleter, cache_->GetDeleter(h1));
  cache_->Release(h1);
 }

@@ -176,13 +176,10 @@ namespace {
 // Cache entry meta data.
 struct CacheHandle {
  Slice key;
+  uint32_t hash;
  void* value;
  size_t charge;
-  Cache::DeleterFn deleter;
-  uint32_t hash;
-
-  // Addition to "charge" to get "total charge" under metadata policy.
-  uint32_t meta_charge;
+  void (*deleter)(const Slice&, void* value);

  // Flags and counters associated with the cache handle:
  //   lowest bit: in-cache bit
@@ -208,8 +205,9 @@ struct CacheHandle {
    return *this;
  }

-  inline static uint32_t CalcMetadataCharge(
-      Slice key, CacheMetadataChargePolicy metadata_charge_policy) {
+  inline static size_t CalcTotalCharge(
+      Slice key, size_t charge,
+      CacheMetadataChargePolicy metadata_charge_policy) {
    size_t meta_charge = 0;
    if (metadata_charge_policy == kFullChargeCacheMetadata) {
      meta_charge += sizeof(CacheHandle);
@@ -220,11 +218,13 @@ struct CacheHandle {
      meta_charge += key.size();
 #endif
    }
-    assert(meta_charge <= UINT32_MAX);
-    return static_cast<uint32_t>(meta_charge);
+    return charge + meta_charge;
  }

-  inline size_t GetTotalCharge() { return charge + meta_charge; }
+  inline size_t CalcTotalCharge(
+      CacheMetadataChargePolicy metadata_charge_policy) {
+    return CalcTotalCharge(key, charge, metadata_charge_policy);
+  }
 };

 // Key of hash map. We store hash value with the key for convenience.
@@ -260,7 +260,7 @@ struct CleanupContext {
 class ClockCacheShard final : public CacheShard {
 public:
  // Hash map type.
-  using HashTable = tbb::concurrent_hash_map<CacheKey, CacheHandle*, CacheKey>;
+  typedef tbb::concurrent_hash_map<CacheKey, CacheHandle*, CacheKey> HashTable;

  ClockCacheShard();
  ~ClockCacheShard() override;
@@ -271,26 +271,7 @@ class ClockCacheShard final : public CacheShard {
  Status Insert(const Slice& key, uint32_t hash, void* value, size_t charge,
                void (*deleter)(const Slice& key, void* value),
                Cache::Handle** handle, Cache::Priority priority) override;
-  Status Insert(const Slice& key, uint32_t hash, void* value,
-                const Cache::CacheItemHelper* helper, size_t charge,
-                Cache::Handle** handle, Cache::Priority priority) override {
-    return Insert(key, hash, value, charge, helper->del_cb, handle, priority);
-  }
  Cache::Handle* Lookup(const Slice& key, uint32_t hash) override;
-  Cache::Handle* Lookup(const Slice& key, uint32_t hash,
-                        const Cache::CacheItemHelper* /*helper*/,
-                        const Cache::CreateCallback& /*create_cb*/,
-                        Cache::Priority /*priority*/, bool /*wait*/,
-                        Statistics* /*stats*/) override {
-    return Lookup(key, hash);
-  }
-  bool Release(Cache::Handle* handle, bool /*useful*/,
-               bool force_erase) override {
-    return Release(handle, force_erase);
-  }
-  bool IsReady(Cache::Handle* /*handle*/) override { return true; }
-  void Wait(Cache::Handle* /*handle*/) override {}
-
  // If the entry in in cache, increase reference count and return true.
  // Return false otherwise.
  //
@@ -303,10 +284,8 @@ class ClockCacheShard final : public CacheShard {
  size_t GetUsage() const override;
  size_t GetPinnedUsage() const override;
  void EraseUnRefEntries() override;
-  void ApplyToSomeEntries(
-      const std::function<void(const Slice& key, void* value, size_t charge,
-                               DeleterFn deleter)>& callback,
-      uint32_t average_entries_per_lock, uint32_t* state) override;
+  void ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                              bool thread_safe) override;

 private:
  static const uint32_t kInCacheBit = 1;
@@ -425,46 +404,22 @@ size_t ClockCacheShard::GetPinnedUsage() const {
  return pinned_usage_.load(std::memory_order_relaxed);
 }

-void ClockCacheShard::ApplyToSomeEntries(
-    const std::function<void(const Slice& key, void* value, size_t charge,
-                             DeleterFn deleter)>& callback,
-    uint32_t average_entries_per_lock, uint32_t* state) {
-  assert(average_entries_per_lock > 0);
-  MutexLock lock(&mutex_);
-
-  // Figure out the range to iterate, update `state`
-  size_t list_size = list_.size();
-  size_t start_idx = *state;
-  size_t end_idx = start_idx + average_entries_per_lock;
-  if (start_idx > list_size) {
-    // Shouldn't reach here, but recoverable
-    assert(false);
-    // Mark finished with all
-    *state = UINT32_MAX;
-    return;
+void ClockCacheShard::ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                                             bool thread_safe) {
+  if (thread_safe) {
+    mutex_.Lock();
  }
-  if (end_idx >= list_size || end_idx >= UINT32_MAX) {
-    // This also includes the hypothetical case of >4 billion
-    // cache handles.
-    end_idx = list_size;
-    // Mark finished with all
-    *state = UINT32_MAX;
-  } else {
-    *state = static_cast<uint32_t>(end_idx);
-  }
-
-  // Do the iteration
-  auto cur = list_.begin() + start_idx;
-  auto end = list_.begin() + end_idx;
-  for (; cur != end; ++cur) {
-    const CacheHandle& handle = *cur;
-    // Use relaxed semantics instead of acquire semantics since we are
-    // holding mutex
+  for (auto& handle : list_) {
+    // Use relaxed semantics instead of acquire semantics since we are either
+    // holding mutex, or don't have thread safe requirement.
    uint32_t flags = handle.flags.load(std::memory_order_relaxed);
    if (InCache(flags)) {
-      callback(handle.key, handle.value, handle.charge, handle.deleter);
+      callback(handle.value, handle.charge);
    }
  }
+  if (thread_safe) {
+    mutex_.Unlock();
+  }
 }

 void ClockCacheShard::RecycleHandle(CacheHandle* handle,
@@ -473,8 +428,10 @@ void ClockCacheShard::RecycleHandle(CacheHandle* handle,
  assert(!InCache(handle->flags) && CountRefs(handle->flags) == 0);
  context->to_delete_key.push_back(handle->key.data());
  context->to_delete_value.emplace_back(*handle);
-  size_t total_charge = handle->GetTotalCharge();
-  // clearing `handle` fields would go here but not strictly required
+  size_t total_charge = handle->CalcTotalCharge(metadata_charge_policy_);
+  handle->key.clear();
+  handle->value = nullptr;
+  handle->deleter = nullptr;
  recycle_.push_back(handle);
  usage_.fetch_sub(total_charge, std::memory_order_relaxed);
 }
@@ -502,7 +459,7 @@ bool ClockCacheShard::Ref(Cache::Handle* h) {
                                            std::memory_order_relaxed)) {
      if (CountRefs(flags) == 0) {
        // No reference count before the operation.
-        size_t total_charge = handle->GetTotalCharge();
+        size_t total_charge = handle->CalcTotalCharge(metadata_charge_policy_);
        pinned_usage_.fetch_add(total_charge, std::memory_order_relaxed);
      }
      return true;
@@ -516,11 +473,6 @@ bool ClockCacheShard::Unref(CacheHandle* handle, bool set_usage,
  if (set_usage) {
    handle->flags.fetch_or(kUsageBit, std::memory_order_relaxed);
  }
-  // If the handle reaches state refs=0 and InCache=true after this
-  // atomic operation then we cannot access `handle` afterward, because
-  // it could be evicted before we access the `handle`.
-  size_t total_charge = handle->GetTotalCharge();
-
  // Use acquire-release semantics as previous operations on the cache entry
  // has to be order before reference count is decreased, and potential cleanup
  // of the entry has to be order after.
@@ -528,6 +480,7 @@ bool ClockCacheShard::Unref(CacheHandle* handle, bool set_usage,
  assert(CountRefs(flags) > 0);
  if (CountRefs(flags) == 1) {
    // this is the last reference.
+    size_t total_charge = handle->CalcTotalCharge(metadata_charge_policy_);
    pinned_usage_.fetch_sub(total_charge, std::memory_order_relaxed);
    // Cleanup if it is the last reference.
    if (!InCache(flags)) {
@@ -614,9 +567,8 @@ CacheHandle* ClockCacheShard::Insert(
    void (*deleter)(const Slice& key, void* value), bool hold_reference,
    CleanupContext* context, bool* overwritten) {
  assert(overwritten != nullptr && *overwritten == false);
-  uint32_t meta_charge =
-      CacheHandle::CalcMetadataCharge(key, metadata_charge_policy_);
-  size_t total_charge = charge + meta_charge;
+  size_t total_charge =
+      CacheHandle::CalcTotalCharge(key, charge, metadata_charge_policy_);
  MutexLock l(&mutex_);
  bool success = EvictFromCache(total_charge, context);
  bool strict = strict_capacity_limit_.load(std::memory_order_relaxed);
@@ -642,18 +594,8 @@ CacheHandle* ClockCacheShard::Insert(
  handle->hash = hash;
  handle->value = value;
  handle->charge = charge;
-  handle->meta_charge = meta_charge;
  handle->deleter = deleter;
  uint32_t flags = hold_reference ? kInCacheBit + kOneRef : kInCacheBit;
-
-  // TODO investigate+fix suspected race condition:
-  // [thread 1] Lookup starts, up to Ref()
-  // [thread 2] Erase/evict the entry just looked up
-  // [thread 1] Ref() the handle, even though it's in the recycle bin
-  // [thread 2] Insert with recycling that handle
-  // Here we obliterate the other thread's Ref
-  // Possible fix: never blindly overwrite the flags, but only make
-  // relative updates (fetch_add, etc).
  handle->flags.store(flags, std::memory_order_relaxed);
  HashTable::accessor accessor;
  if (table_.find(accessor, CacheKey(key, hash))) {
@@ -784,11 +726,11 @@ class ClockCache final : public ShardedCache {

  const char* Name() const override { return "ClockCache"; }

-  CacheShard* GetShard(uint32_t shard) override {
+  CacheShard* GetShard(int shard) override {
    return reinterpret_cast<CacheShard*>(&shards_[shard]);
  }

-  const CacheShard* GetShard(uint32_t shard) const override {
+  const CacheShard* GetShard(int shard) const override {
    return reinterpret_cast<CacheShard*>(&shards_[shard]);
  }

@@ -804,17 +746,7 @@ class ClockCache final : public ShardedCache {
    return reinterpret_cast<const CacheHandle*>(handle)->hash;
  }

-  DeleterFn GetDeleter(Handle* handle) const override {
-    return reinterpret_cast<const CacheHandle*>(handle)->deleter;
-  }
-
-  void DisownData() override {
-#ifndef MUST_FREE_HEAP_ALLOCATIONS
-    shards_ = nullptr;
-#endif
-  }
-
-  void WaitAll(std::vector<Handle*>& /*handles*/) override {}
+  void DisownData() override { shards_ = nullptr; }

 private:
  ClockCacheShard* shards_;
@@ -9,30 +9,26 @@

 #include "cache/lru_cache.h"

-#include <cassert>
-#include <cstdint>
-#include <cstdio>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>

-#include "monitoring/perf_context_imp.h"
-#include "monitoring/statistics.h"
 #include "util/mutexlock.h"

 namespace ROCKSDB_NAMESPACE {

-LRUHandleTable::LRUHandleTable(int max_upper_hash_bits)
-    : length_bits_(/* historical starting size*/ 4),
-      list_(new LRUHandle* [size_t{1} << length_bits_] {}),
-      elems_(0),
-      max_length_bits_(max_upper_hash_bits) {}
+LRUHandleTable::LRUHandleTable() : list_(nullptr), length_(0), elems_(0) {
+  Resize();
+}

 LRUHandleTable::~LRUHandleTable() {
-  ApplyToEntriesRange(
-      [](LRUHandle* h) {
-        if (!h->HasRefs()) {
-          h->Free();
-        }
-      },
-      0, uint32_t{1} << length_bits_);
+  ApplyToAllCacheEntries([](LRUHandle* h) {
+    if (!h->HasRefs()) {
+      h->Free();
+    }
+  });
+  delete[] list_;
 }

 LRUHandle* LRUHandleTable::Lookup(const Slice& key, uint32_t hash) {
@@ -46,7 +42,7 @@ LRUHandle* LRUHandleTable::Insert(LRUHandle* h) {
  *ptr = h;
  if (old == nullptr) {
    ++elems_;
-    if ((elems_ >> length_bits_) > 0) {  // elems_ >= length
+    if (elems_ > length_) {
      // Since each cache entry is fairly large, we aim for a small
      // average linked list length (<= 1).
      Resize();
@@ -66,7 +62,7 @@ LRUHandle* LRUHandleTable::Remove(const Slice& key, uint32_t hash) {
 }

 LRUHandle** LRUHandleTable::FindPointer(const Slice& key, uint32_t hash) {
-  LRUHandle** ptr = &list_[hash >> (32 - length_bits_)];
+  LRUHandle** ptr = &list_[hash & (length_ - 1)];
  while (*ptr != nullptr && ((*ptr)->hash != hash || key != (*ptr)->key())) {
    ptr = &(*ptr)->next_hash;
  }
@@ -74,29 +70,19 @@ LRUHandle** LRUHandleTable::FindPointer(const Slice& key, uint32_t hash) {
 }

 void LRUHandleTable::Resize() {
-  if (length_bits_ >= max_length_bits_) {
-    // Due to reaching limit of hash information, if we made the table
-    // bigger, we would allocate more addresses but only the same
-    // number would be used.
-    return;
+  uint32_t new_length = 16;
+  while (new_length < elems_ * 1.5) {
+    new_length *= 2;
  }
-  if (length_bits_ >= 31) {
-    // Avoid undefined behavior shifting uint32_t by 32
-    return;
-  }
-
-  uint32_t old_length = uint32_t{1} << length_bits_;
-  int new_length_bits = length_bits_ + 1;
-  std::unique_ptr<LRUHandle* []> new_list {
-    new LRUHandle* [size_t{1} << new_length_bits] {}
-  };
+  LRUHandle** new_list = new LRUHandle*[new_length];
+  memset(new_list, 0, sizeof(new_list[0]) * new_length);
  uint32_t count = 0;
-  for (uint32_t i = 0; i < old_length; i++) {
+  for (uint32_t i = 0; i < length_; i++) {
    LRUHandle* h = list_[i];
    while (h != nullptr) {
      LRUHandle* next = h->next_hash;
      uint32_t hash = h->hash;
-      LRUHandle** ptr = &new_list[hash >> (32 - new_length_bits)];
+      LRUHandle** ptr = &new_list[hash & (new_length - 1)];
      h->next_hash = *ptr;
      *ptr = h;
      h = next;
@@ -104,25 +90,23 @@ void LRUHandleTable::Resize() {
    }
  }
  assert(elems_ == count);
-  list_ = std::move(new_list);
-  length_bits_ = new_length_bits;
+  delete[] list_;
+  list_ = new_list;
+  length_ = new_length;
 }

-LRUCacheShard::LRUCacheShard(
-    size_t capacity, bool strict_capacity_limit, double high_pri_pool_ratio,
-    bool use_adaptive_mutex, CacheMetadataChargePolicy metadata_charge_policy,
-    int max_upper_hash_bits,
-    const std::shared_ptr<SecondaryCache>& secondary_cache)
+LRUCacheShard::LRUCacheShard(size_t capacity, bool strict_capacity_limit,
+                             double high_pri_pool_ratio,
+                             bool use_adaptive_mutex,
+                             CacheMetadataChargePolicy metadata_charge_policy)
    : capacity_(0),
      high_pri_pool_usage_(0),
      strict_capacity_limit_(strict_capacity_limit),
      high_pri_pool_ratio_(high_pri_pool_ratio),
      high_pri_pool_capacity_(0),
-      table_(max_upper_hash_bits),
      usage_(0),
      lru_usage_(0),
-      mutex_(use_adaptive_mutex),
-      secondary_cache_(secondary_cache) {
+      mutex_(use_adaptive_mutex) {
  set_metadata_charge_policy(metadata_charge_policy);
  // Make empty circular linked list
  lru_.next = &lru_;
@@ -154,40 +138,19 @@ void LRUCacheShard::EraseUnRefEntries() {
  }
 }

-void LRUCacheShard::ApplyToSomeEntries(
-    const std::function<void(const Slice& key, void* value, size_t charge,
-                             DeleterFn deleter)>& callback,
-    uint32_t average_entries_per_lock, uint32_t* state) {
-  // The state is essentially going to be the starting hash, which works
-  // nicely even if we resize between calls because we use upper-most
-  // hash bits for table indexes.
-  MutexLock l(&mutex_);
-  uint32_t length_bits = table_.GetLengthBits();
-  uint32_t length = uint32_t{1} << length_bits;
+void LRUCacheShard::ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                                           bool thread_safe) {
+  const auto applyCallback = [&]() {
+    table_.ApplyToAllCacheEntries(
+        [callback](LRUHandle* h) { callback(h->value, h->charge); });
+  };

-  assert(average_entries_per_lock > 0);
-  // Assuming we are called with same average_entries_per_lock repeatedly,
-  // this simplifies some logic (index_end will not overflow)
-  assert(average_entries_per_lock < length || *state == 0);
-
-  uint32_t index_begin = *state >> (32 - length_bits);
-  uint32_t index_end = index_begin + average_entries_per_lock;
-  if (index_end >= length) {
-    // Going to end
-    index_end = length;
-    *state = UINT32_MAX;
+  if (thread_safe) {
+    MutexLock l(&mutex_);
+    applyCallback();
  } else {
-    *state = index_end << (32 - length_bits);
+    applyCallback();
  }
-
-  table_.ApplyToEntriesRange(
-      [callback](LRUHandle* h) {
-        DeleterFn deleter = h->IsSecondaryCacheCompatible()
-                                ? h->info_.helper->del_cb
-                                : h->info_.deleter;
-        callback(h->key(), h->value, h->charge, deleter);
-      },
-      index_begin, index_end);
 }

 void LRUCacheShard::TEST_GetLRUList(LRUHandle** lru, LRUHandle** lru_low_pri) {
@@ -294,14 +257,8 @@ void LRUCacheShard::SetCapacity(size_t capacity) {
    EvictFromLRU(0, &last_reference_list);
  }

-  // Try to insert the evicted entries into tiered cache
  // Free the entries outside of mutex for performance reasons
  for (auto entry : last_reference_list) {
-    if (secondary_cache_ && entry->IsSecondaryCacheCompatible() &&
-        !entry->IsPromoted()) {
-      secondary_cache_->Insert(entry->key(), entry->value, entry->info_.helper)
-          .PermitUncheckedError();
-    }
    entry->Free();
  }
 }
@@ -311,181 +268,17 @@ void LRUCacheShard::SetStrictCapacityLimit(bool strict_capacity_limit) {
  strict_capacity_limit_ = strict_capacity_limit;
 }

-Status LRUCacheShard::InsertItem(LRUHandle* e, Cache::Handle** handle,
-                                 bool free_handle_on_fail) {
-  Status s = Status::OK();
-  autovector<LRUHandle*> last_reference_list;
-  size_t total_charge = e->CalcTotalCharge(metadata_charge_policy_);
-
-  {
-    MutexLock l(&mutex_);
-
-    // Free the space following strict LRU policy until enough space
-    // is freed or the lru list is empty
-    EvictFromLRU(total_charge, &last_reference_list);
-
-    if ((usage_ + total_charge) > capacity_ &&
-        (strict_capacity_limit_ || handle == nullptr)) {
-      e->SetInCache(false);
-      if (handle == nullptr) {
-        // Don't insert the entry but still return ok, as if the entry inserted
-        // into cache and get evicted immediately.
-        last_reference_list.push_back(e);
-      } else {
-        if (free_handle_on_fail) {
-          delete[] reinterpret_cast<char*>(e);
-          *handle = nullptr;
-        }
-        s = Status::Incomplete("Insert failed due to LRU cache being full.");
-      }
-    } else {
-      // Insert into the cache. Note that the cache might get larger than its
-      // capacity if not enough space was freed up.
-      LRUHandle* old = table_.Insert(e);
-      usage_ += total_charge;
-      if (old != nullptr) {
-        s = Status::OkOverwritten();
-        assert(old->InCache());
-        old->SetInCache(false);
-        if (!old->HasRefs()) {
-          // old is on LRU because it's in cache and its reference count is 0
-          LRU_Remove(old);
-          size_t old_total_charge =
-              old->CalcTotalCharge(metadata_charge_policy_);
-          assert(usage_ >= old_total_charge);
-          usage_ -= old_total_charge;
-          last_reference_list.push_back(old);
-        }
-      }
-      if (handle == nullptr) {
-        LRU_Insert(e);
-      } else {
-        // If caller already holds a ref, no need to take one here
-        if (!e->HasRefs()) {
-          e->Ref();
-        }
-        *handle = reinterpret_cast<Cache::Handle*>(e);
-      }
-    }
-  }
-
-  // Try to insert the evicted entries into the secondary cache
-  // Free the entries here outside of mutex for performance reasons
-  for (auto entry : last_reference_list) {
-    if (secondary_cache_ && entry->IsSecondaryCacheCompatible() &&
-        !entry->IsPromoted()) {
-      secondary_cache_->Insert(entry->key(), entry->value, entry->info_.helper)
-          .PermitUncheckedError();
-    }
-    entry->Free();
-  }
-
-  return s;
-}
-
-void LRUCacheShard::Promote(LRUHandle* e) {
-  SecondaryCacheResultHandle* secondary_handle = e->sec_handle;
-
-  assert(secondary_handle->IsReady());
-  e->SetIncomplete(false);
-  e->SetInCache(true);
-  e->SetPromoted(true);
-  e->value = secondary_handle->Value();
-  e->charge = secondary_handle->Size();
-  delete secondary_handle;
-
-  // This call could fail if the cache is over capacity and
-  // strict_capacity_limit_ is true. In such a case, we don't want
-  // InsertItem() to free the handle, since the item is already in memory
-  // and the caller will most likely just read from disk if we erase it here.
-  if (e->value) {
-    Cache::Handle* handle = reinterpret_cast<Cache::Handle*>(e);
-    Status s = InsertItem(e, &handle, /*free_handle_on_fail=*/false);
-    if (!s.ok()) {
-      // Item is in memory, but not accounted against the cache capacity.
-      // When the handle is released, the item should get deleted
-      assert(!e->InCache());
-    }
-  } else {
-    // Since the secondary cache lookup failed, mark the item as not in cache
-    // Don't charge the cache as its only metadata that'll shortly be released
-    MutexLock l(&mutex_);
-    e->charge = 0;
-    e->SetInCache(false);
-  }
-}
-
-Cache::Handle* LRUCacheShard::Lookup(
-    const Slice& key, uint32_t hash,
-    const ShardedCache::CacheItemHelper* helper,
-    const ShardedCache::CreateCallback& create_cb, Cache::Priority priority,
-    bool wait, Statistics* stats) {
-  LRUHandle* e = nullptr;
-  {
-    MutexLock l(&mutex_);
-    e = table_.Lookup(key, hash);
-    if (e != nullptr) {
-      assert(e->InCache());
-      if (!e->HasRefs()) {
-        // The entry is in LRU since it's in hash and has no external references
-        LRU_Remove(e);
-      }
-      e->Ref();
-      e->SetHit();
-    }
-  }
-
-  // If handle table lookup failed, then allocate a handle outside the
-  // mutex if we're going to lookup in the secondary cache
-  // Only support synchronous for now
-  // TODO: Support asynchronous lookup in secondary cache
-  if (!e && secondary_cache_ && helper && helper->saveto_cb) {
-    // For objects from the secondary cache, we expect the caller to provide
-    // a way to create/delete the primary cache object. The only case where
-    // a deleter would not be required is for dummy entries inserted for
-    // accounting purposes, which we won't demote to the secondary cache
-    // anyway.
-    assert(create_cb && helper->del_cb);
-    std::unique_ptr<SecondaryCacheResultHandle> secondary_handle =
-        secondary_cache_->Lookup(key, create_cb, wait);
-    if (secondary_handle != nullptr) {
-      e = reinterpret_cast<LRUHandle*>(
-          new char[sizeof(LRUHandle) - 1 + key.size()]);
-
-      e->flags = 0;
-      e->SetSecondaryCacheCompatible(true);
-      e->info_.helper = helper;
-      e->key_length = key.size();
-      e->hash = hash;
-      e->refs = 0;
-      e->next = e->prev = nullptr;
-      e->SetPriority(priority);
-      memcpy(e->key_data, key.data(), key.size());
-      e->value = nullptr;
-      e->sec_handle = secondary_handle.release();
-      e->Ref();
-
-      if (wait) {
-        Promote(e);
-        if (!e->value) {
-          // The secondary cache returned a handle, but the lookup failed
-          e->Unref();
-          e->Free();
-          e = nullptr;
-        } else {
-          PERF_COUNTER_ADD(secondary_cache_hit_count, 1);
-          RecordTick(stats, SECONDARY_CACHE_HITS);
-        }
-      } else {
-        // If wait is false, we always return a handle and let the caller
-        // release the handle after checking for success or failure
-        e->SetIncomplete(true);
-        // This may be slightly inaccurate, if the lookup eventually fails.
-        // But the probability is very low.
-        PERF_COUNTER_ADD(secondary_cache_hit_count, 1);
-        RecordTick(stats, SECONDARY_CACHE_HITS);
-      }
+Cache::Handle* LRUCacheShard::Lookup(const Slice& key, uint32_t hash) {
+  MutexLock l(&mutex_);
+  LRUHandle* e = table_.Lookup(key, hash);
+  if (e != nullptr) {
+    assert(e->InCache());
+    if (!e->HasRefs()) {
+      // The entry is in LRU since it's in hash and has no external references
+      LRU_Remove(e);
    }
+    e->Ref();
+    e->SetHit();
  }
  return reinterpret_cast<Cache::Handle*>(e);
 }
@@ -529,12 +322,7 @@ bool LRUCacheShard::Release(Cache::Handle* handle, bool force_erase) {
        last_reference = false;
      }
    }
-    // If it was the last reference, and the entry is either not secondary
-    // cache compatible (i.e a dummy entry for accounting), or is secondary
-    // cache compatible and has a non-null value, then decrement the cache
-    // usage. If value is null in the latter case, taht means the lookup
-    // failed and we didn't charge the cache.
-    if (last_reference && (!e->IsSecondaryCacheCompatible() || e->value)) {
+    if (last_reference) {
      size_t total_charge = e->CalcTotalCharge(metadata_charge_policy_);
      assert(usage_ >= total_charge);
      usage_ -= total_charge;
@@ -551,35 +339,81 @@ bool LRUCacheShard::Release(Cache::Handle* handle, bool force_erase) {
 Status LRUCacheShard::Insert(const Slice& key, uint32_t hash, void* value,
                             size_t charge,
                             void (*deleter)(const Slice& key, void* value),
-                             const Cache::CacheItemHelper* helper,
                             Cache::Handle** handle, Cache::Priority priority) {
  // Allocate the memory here outside of the mutex
  // If the cache is full, we'll have to release it
  // It shouldn't happen very often though.
  LRUHandle* e = reinterpret_cast<LRUHandle*>(
      new char[sizeof(LRUHandle) - 1 + key.size()]);
+  Status s = Status::OK();
+  autovector<LRUHandle*> last_reference_list;

  e->value = value;
-  e->flags = 0;
-  if (helper) {
-    e->SetSecondaryCacheCompatible(true);
-    e->info_.helper = helper;
-  } else {
-#ifdef __SANITIZE_THREAD__
-    e->is_secondary_cache_compatible_for_tsan = false;
-#endif  // __SANITIZE_THREAD__
-    e->info_.deleter = deleter;
-  }
+  e->deleter = deleter;
  e->charge = charge;
  e->key_length = key.size();
+  e->flags = 0;
  e->hash = hash;
  e->refs = 0;
  e->next = e->prev = nullptr;
  e->SetInCache(true);
  e->SetPriority(priority);
  memcpy(e->key_data, key.data(), key.size());
+  size_t total_charge = e->CalcTotalCharge(metadata_charge_policy_);

-  return InsertItem(e, handle, /* free_handle_on_fail */ true);
+  {
+    MutexLock l(&mutex_);
+
+    // Free the space following strict LRU policy until enough space
+    // is freed or the lru list is empty
+    EvictFromLRU(total_charge, &last_reference_list);
+
+    if ((usage_ + total_charge) > capacity_ &&
+        (strict_capacity_limit_ || handle == nullptr)) {
+      if (handle == nullptr) {
+        // Don't insert the entry but still return ok, as if the entry inserted
+        // into cache and get evicted immediately.
+        e->SetInCache(false);
+        last_reference_list.push_back(e);
+      } else {
+        delete[] reinterpret_cast<char*>(e);
+        *handle = nullptr;
+        s = Status::Incomplete("Insert failed due to LRU cache being full.");
+      }
+    } else {
+      // Insert into the cache. Note that the cache might get larger than its
+      // capacity if not enough space was freed up.
+      LRUHandle* old = table_.Insert(e);
+      usage_ += total_charge;
+      if (old != nullptr) {
+        s = Status::OkOverwritten();
+        assert(old->InCache());
+        old->SetInCache(false);
+        if (!old->HasRefs()) {
+          // old is on LRU because it's in cache and its reference count is 0
+          LRU_Remove(old);
+          size_t old_total_charge =
+              old->CalcTotalCharge(metadata_charge_policy_);
+          assert(usage_ >= old_total_charge);
+          usage_ -= old_total_charge;
+          last_reference_list.push_back(old);
+        }
+      }
+      if (handle == nullptr) {
+        LRU_Insert(e);
+      } else {
+        e->Ref();
+        *handle = reinterpret_cast<Cache::Handle*>(e);
+      }
+    }
+  }
+
+  // Free the entries here outside of mutex for performance reasons
+  for (auto entry : last_reference_list) {
+    entry->Free();
+  }
+
+  return s;
 }

 void LRUCacheShard::Erase(const Slice& key, uint32_t hash) {
@@ -609,18 +443,6 @@ void LRUCacheShard::Erase(const Slice& key, uint32_t hash) {
  }
 }

-bool LRUCacheShard::IsReady(Cache::Handle* handle) {
-  LRUHandle* e = reinterpret_cast<LRUHandle*>(handle);
-  MutexLock l(&mutex_);
-  bool ready = true;
-  if (e->IsPending()) {
-    assert(secondary_cache_);
-    assert(e->sec_handle);
-    ready = e->sec_handle->IsReady();
-  }
-  return ready;
-}
-
 size_t LRUCacheShard::GetUsage() const {
  MutexLock l(&mutex_);
  return usage_;
@@ -647,8 +469,7 @@ LRUCache::LRUCache(size_t capacity, int num_shard_bits,
                   bool strict_capacity_limit, double high_pri_pool_ratio,
                   std::shared_ptr<MemoryAllocator> allocator,
                   bool use_adaptive_mutex,
-                   CacheMetadataChargePolicy metadata_charge_policy,
-                   const std::shared_ptr<SecondaryCache>& secondary_cache)
+                   CacheMetadataChargePolicy metadata_charge_policy)
    : ShardedCache(capacity, num_shard_bits, strict_capacity_limit,
                   std::move(allocator)) {
  num_shards_ = 1 << num_shard_bits;
@@ -656,12 +477,10 @@ LRUCache::LRUCache(size_t capacity, int num_shard_bits,
      port::cacheline_aligned_alloc(sizeof(LRUCacheShard) * num_shards_));
  size_t per_shard = (capacity + (num_shards_ - 1)) / num_shards_;
  for (int i = 0; i < num_shards_; i++) {
-    new (&shards_[i]) LRUCacheShard(
-        per_shard, strict_capacity_limit, high_pri_pool_ratio,
-        use_adaptive_mutex, metadata_charge_policy,
-        /* max_upper_hash_bits */ 32 - num_shard_bits, secondary_cache);
+    new (&shards_[i])
+        LRUCacheShard(per_shard, strict_capacity_limit, high_pri_pool_ratio,
+                      use_adaptive_mutex, metadata_charge_policy);
  }
-  secondary_cache_ = secondary_cache;
 }

 LRUCache::~LRUCache() {
@@ -674,11 +493,11 @@ LRUCache::~LRUCache() {
  }
 }

-CacheShard* LRUCache::GetShard(uint32_t shard) {
+CacheShard* LRUCache::GetShard(int shard) {
  return reinterpret_cast<CacheShard*>(&shards_[shard]);
 }

-const CacheShard* LRUCache::GetShard(uint32_t shard) const {
+const CacheShard* LRUCache::GetShard(int shard) const {
  return reinterpret_cast<CacheShard*>(&shards_[shard]);
 }

@@ -690,25 +509,23 @@ size_t LRUCache::GetCharge(Handle* handle) const {
  return reinterpret_cast<const LRUHandle*>(handle)->charge;
 }

-Cache::DeleterFn LRUCache::GetDeleter(Handle* handle) const {
-  auto h = reinterpret_cast<const LRUHandle*>(handle);
-  if (h->IsSecondaryCacheCompatible()) {
-    return h->info_.helper->del_cb;
-  } else {
-    return h->info_.deleter;
-  }
-}
-
 uint32_t LRUCache::GetHash(Handle* handle) const {
  return reinterpret_cast<const LRUHandle*>(handle)->hash;
 }

 void LRUCache::DisownData() {
 // Do not drop data if compile with ASAN to suppress leak warning.
-#ifndef MUST_FREE_HEAP_ALLOCATIONS
+#if defined(__clang__)
+#if !defined(__has_feature) || !__has_feature(address_sanitizer)
  shards_ = nullptr;
  num_shards_ = 0;
 #endif
+#else  // __clang__
+#ifndef __SANITIZE_ADDRESS__
+  shards_ = nullptr;
+  num_shards_ = 0;
+#endif  // !__SANITIZE_ADDRESS__
+#endif  // __clang__
 }

 size_t LRUCache::TEST_GetLRUSize() {
@@ -727,42 +544,19 @@ double LRUCache::GetHighPriPoolRatio() {
  return result;
 }

-void LRUCache::WaitAll(std::vector<Handle*>& handles) {
-  if (secondary_cache_) {
-    std::vector<SecondaryCacheResultHandle*> sec_handles;
-    sec_handles.reserve(handles.size());
-    for (Handle* handle : handles) {
-      if (!handle) {
-        continue;
-      }
-      LRUHandle* lru_handle = reinterpret_cast<LRUHandle*>(handle);
-      if (!lru_handle->IsPending()) {
-        continue;
-      }
-      sec_handles.emplace_back(lru_handle->sec_handle);
-    }
-    secondary_cache_->WaitAll(sec_handles);
-    for (Handle* handle : handles) {
-      if (!handle) {
-        continue;
-      }
-      LRUHandle* lru_handle = reinterpret_cast<LRUHandle*>(handle);
-      if (!lru_handle->IsPending()) {
-        continue;
-      }
-      uint32_t hash = GetHash(handle);
-      LRUCacheShard* shard = static_cast<LRUCacheShard*>(GetShard(Shard(hash)));
-      shard->Promote(lru_handle);
-    }
-  }
+std::shared_ptr<Cache> NewLRUCache(const LRUCacheOptions& cache_opts) {
+  return NewLRUCache(cache_opts.capacity, cache_opts.num_shard_bits,
+                     cache_opts.strict_capacity_limit,
+                     cache_opts.high_pri_pool_ratio,
+                     cache_opts.memory_allocator, cache_opts.use_adaptive_mutex,
+                     cache_opts.metadata_charge_policy);
 }

 std::shared_ptr<Cache> NewLRUCache(
    size_t capacity, int num_shard_bits, bool strict_capacity_limit,
    double high_pri_pool_ratio,
    std::shared_ptr<MemoryAllocator> memory_allocator, bool use_adaptive_mutex,
-    CacheMetadataChargePolicy metadata_charge_policy,
-    const std::shared_ptr<SecondaryCache>& secondary_cache) {
+    CacheMetadataChargePolicy metadata_charge_policy) {
  if (num_shard_bits >= 20) {
    return nullptr;  // the cache cannot be sharded into too many fine pieces
  }
@@ -775,25 +569,7 @@ std::shared_ptr<Cache> NewLRUCache(
  }
  return std::make_shared<LRUCache>(
      capacity, num_shard_bits, strict_capacity_limit, high_pri_pool_ratio,
-      std::move(memory_allocator), use_adaptive_mutex, metadata_charge_policy,
-      secondary_cache);
+      std::move(memory_allocator), use_adaptive_mutex, metadata_charge_policy);
 }

-std::shared_ptr<Cache> NewLRUCache(const LRUCacheOptions& cache_opts) {
-  return NewLRUCache(
-      cache_opts.capacity, cache_opts.num_shard_bits,
-      cache_opts.strict_capacity_limit, cache_opts.high_pri_pool_ratio,
-      cache_opts.memory_allocator, cache_opts.use_adaptive_mutex,
-      cache_opts.metadata_charge_policy, cache_opts.secondary_cache);
-}
-
-std::shared_ptr<Cache> NewLRUCache(
-    size_t capacity, int num_shard_bits, bool strict_capacity_limit,
-    double high_pri_pool_ratio,
-    std::shared_ptr<MemoryAllocator> memory_allocator, bool use_adaptive_mutex,
-    CacheMetadataChargePolicy metadata_charge_policy) {
-  return NewLRUCache(capacity, num_shard_bits, strict_capacity_limit,
-                     high_pri_pool_ratio, memory_allocator, use_adaptive_mutex,
-                     metadata_charge_policy, nullptr);
-}
 }  // namespace ROCKSDB_NAMESPACE
@@ -1,4 +1,4 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
 //  This source code is licensed under both the GPLv2 (found in the
 //  COPYING file in the root directory) and Apache 2.0 License
 //  (found in the LICENSE.Apache file in the root directory).
@@ -8,14 +8,12 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 #pragma once

-#include <memory>
 #include <string>

 #include "cache/sharded_cache.h"
-#include "port/lang.h"
+
 #include "port/malloc.h"
 #include "port/port.h"
-#include "rocksdb/secondary_cache.h"
 #include "util/autovector.h"

 namespace ROCKSDB_NAMESPACE {
@@ -51,18 +49,8 @@ namespace ROCKSDB_NAMESPACE {

 struct LRUHandle {
  void* value;
-  union Info {
-    Info() {}
-    ~Info() {}
-    Cache::DeleterFn deleter;
-    const ShardedCache::CacheItemHelper* helper;
-  } info_;
-  // An entry is not added to the LRUHandleTable until the secondary cache
-  // lookup is complete, so its safe to have this union.
-  union {
-    LRUHandle* next_hash;
-    SecondaryCacheResultHandle* sec_handle;
-  };
+  void (*deleter)(const Slice&, void* value);
+  LRUHandle* next_hash;
  LRUHandle* next;
  LRUHandle* prev;
  size_t charge;  // TODO(opt): Only allow uint32_t?
@@ -79,26 +67,12 @@ struct LRUHandle {
    IS_HIGH_PRI = (1 << 1),
    // Whether this entry is in high-pri pool.
    IN_HIGH_PRI_POOL = (1 << 2),
-    // Whether this entry has had any lookups (hits).
+    // Wwhether this entry has had any lookups (hits).
    HAS_HIT = (1 << 3),
-    // Can this be inserted into the secondary cache
-    IS_SECONDARY_CACHE_COMPATIBLE = (1 << 4),
-    // Is the handle still being read from a lower tier
-    IS_PENDING = (1 << 5),
-    // Has the item been promoted from a lower tier
-    IS_PROMOTED = (1 << 6),
  };

  uint8_t flags;

-#ifdef __SANITIZE_THREAD__
-  // TSAN can report a false data race on flags, where one thread is writing
-  // to one of the mutable bits and another thread is reading this immutable
-  // bit. So precisely suppress that TSAN warning, we separate out this bit
-  // during TSAN runs.
-  bool is_secondary_cache_compatible_for_tsan;
-#endif  // __SANITIZE_THREAD__
-
  // Beginning of the key (MUST BE THE LAST FIELD IN THIS STRUCT!)
  char key_data[1];

@@ -121,15 +95,6 @@ struct LRUHandle {
  bool IsHighPri() const { return flags & IS_HIGH_PRI; }
  bool InHighPriPool() const { return flags & IN_HIGH_PRI_POOL; }
  bool HasHit() const { return flags & HAS_HIT; }
-  bool IsSecondaryCacheCompatible() const {
-#ifdef __SANITIZE_THREAD__
-    return is_secondary_cache_compatible_for_tsan;
-#else
-    return flags & IS_SECONDARY_CACHE_COMPATIBLE;
-#endif  // __SANITIZE_THREAD__
-  }
-  bool IsPending() const { return flags & IS_PENDING; }
-  bool IsPromoted() const { return flags & IS_PROMOTED; }

  void SetInCache(bool in_cache) {
    if (in_cache) {
@@ -157,58 +122,15 @@ struct LRUHandle {

  void SetHit() { flags |= HAS_HIT; }

-  void SetSecondaryCacheCompatible(bool compat) {
-    if (compat) {
-      flags |= IS_SECONDARY_CACHE_COMPATIBLE;
-    } else {
-      flags &= ~IS_SECONDARY_CACHE_COMPATIBLE;
-    }
-#ifdef __SANITIZE_THREAD__
-    is_secondary_cache_compatible_for_tsan = compat;
-#endif  // __SANITIZE_THREAD__
-  }
-
-  void SetIncomplete(bool incomp) {
-    if (incomp) {
-      flags |= IS_PENDING;
-    } else {
-      flags &= ~IS_PENDING;
-    }
-  }
-
-  void SetPromoted(bool promoted) {
-    if (promoted) {
-      flags |= IS_PROMOTED;
-    } else {
-      flags &= ~IS_PROMOTED;
-    }
-  }
-
  void Free() {
    assert(refs == 0);
-#ifdef __SANITIZE_THREAD__
-    // Here we can safely assert they are the same without a data race reported
-    assert(((flags & IS_SECONDARY_CACHE_COMPATIBLE) != 0) ==
-           is_secondary_cache_compatible_for_tsan);
-#endif  // __SANITIZE_THREAD__
-    if (!IsSecondaryCacheCompatible() && info_.deleter) {
-      (*info_.deleter)(key(), value);
-    } else if (IsSecondaryCacheCompatible()) {
-      if (IsPending()) {
-        assert(sec_handle != nullptr);
-        SecondaryCacheResultHandle* tmp_sec_handle = sec_handle;
-        tmp_sec_handle->Wait();
-        value = tmp_sec_handle->Value();
-        delete tmp_sec_handle;
-      }
-      if (value) {
-        (*info_.helper->del_cb)(key(), value);
-      }
+    if (deleter) {
+      (*deleter)(key(), value);
    }
    delete[] reinterpret_cast<char*>(this);
  }

-  // Calculate the memory usage by metadata
+  // Caclculate the memory usage by metadata
  inline size_t CalcTotalCharge(
      CacheMetadataChargePolicy metadata_charge_policy) {
    size_t meta_charge = 0;
@@ -231,10 +153,7 @@ struct LRUHandle {
 // 4.4.3's builtin hashtable.
 class LRUHandleTable {
 public:
-  // If the table uses more hash bits than `max_upper_hash_bits`,
-  // it will eat into the bits used for sharding, which are constant
-  // for a given LRUHandleTable.
-  explicit LRUHandleTable(int max_upper_hash_bits);
+  LRUHandleTable();
  ~LRUHandleTable();

  LRUHandle* Lookup(const Slice& key, uint32_t hash);
@@ -242,8 +161,8 @@ class LRUHandleTable {
  LRUHandle* Remove(const Slice& key, uint32_t hash);

  template <typename T>
-  void ApplyToEntriesRange(T func, uint32_t index_begin, uint32_t index_end) {
-    for (uint32_t i = index_begin; i < index_end; i++) {
+  void ApplyToAllCacheEntries(T func) {
+    for (uint32_t i = 0; i < length_; i++) {
      LRUHandle* h = list_[i];
      while (h != nullptr) {
        auto n = h->next_hash;
@@ -254,8 +173,6 @@ class LRUHandleTable {
    }
  }

-  int GetLengthBits() const { return length_bits_; }
-
 private:
  // Return a pointer to slot that points to a cache entry that
  // matches key/hash.  If there is no such cache entry, return a
@@ -264,19 +181,11 @@ class LRUHandleTable {

  void Resize();

-  // Number of hash bits (upper because lower bits used for sharding)
-  // used for table index. Length == 1 << length_bits_
-  int length_bits_;
-
  // The table consists of an array of buckets where each bucket is
  // a linked list of cache entries that hash into the bucket.
-  std::unique_ptr<LRUHandle*[]> list_;
-
-  // Number of elements currently in the table
+  LRUHandle** list_;
+  uint32_t length_;
  uint32_t elems_;
-
-  // Set from max_upper_hash_bits (see constructor)
-  const int max_length_bits_;
 };

 // A single shard of sharded cache.
@@ -284,9 +193,7 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard final : public CacheShard {
 public:
  LRUCacheShard(size_t capacity, bool strict_capacity_limit,
                double high_pri_pool_ratio, bool use_adaptive_mutex,
-                CacheMetadataChargePolicy metadata_charge_policy,
-                int max_upper_hash_bits,
-                const std::shared_ptr<SecondaryCache>& secondary_cache);
+                CacheMetadataChargePolicy metadata_charge_policy);
  virtual ~LRUCacheShard() override = default;

  // Separate from constructor so caller can easily make an array of LRUCache
@@ -302,35 +209,11 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard final : public CacheShard {

  // Like Cache methods, but with an extra "hash" parameter.
  virtual Status Insert(const Slice& key, uint32_t hash, void* value,
-                        size_t charge, Cache::DeleterFn deleter,
+                        size_t charge,
+                        void (*deleter)(const Slice& key, void* value),
                        Cache::Handle** handle,
-                        Cache::Priority priority) override {
-    return Insert(key, hash, value, charge, deleter, nullptr, handle, priority);
-  }
-  virtual Status Insert(const Slice& key, uint32_t hash, void* value,
-                        const Cache::CacheItemHelper* helper, size_t charge,
-                        Cache::Handle** handle,
-                        Cache::Priority priority) override {
-    assert(helper);
-    return Insert(key, hash, value, charge, nullptr, helper, handle, priority);
-  }
-  // If helper_cb is null, the values of the following arguments don't
-  // matter
-  virtual Cache::Handle* Lookup(const Slice& key, uint32_t hash,
-                                const ShardedCache::CacheItemHelper* helper,
-                                const ShardedCache::CreateCallback& create_cb,
-                                ShardedCache::Priority priority, bool wait,
-                                Statistics* stats) override;
-  virtual Cache::Handle* Lookup(const Slice& key, uint32_t hash) override {
-    return Lookup(key, hash, nullptr, nullptr, Cache::Priority::LOW, true,
-                  nullptr);
-  }
-  virtual bool Release(Cache::Handle* handle, bool /*useful*/,
-                       bool force_erase) override {
-    return Release(handle, force_erase);
-  }
-  virtual bool IsReady(Cache::Handle* /*handle*/) override;
-  virtual void Wait(Cache::Handle* /*handle*/) override {}
+                        Cache::Priority priority) override;
+  virtual Cache::Handle* Lookup(const Slice& key, uint32_t hash) override;
  virtual bool Ref(Cache::Handle* handle) override;
  virtual bool Release(Cache::Handle* handle,
                       bool force_erase = false) override;
@@ -343,10 +226,8 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard final : public CacheShard {
  virtual size_t GetUsage() const override;
  virtual size_t GetPinnedUsage() const override;

-  virtual void ApplyToSomeEntries(
-      const std::function<void(const Slice& key, void* value, size_t charge,
-                               DeleterFn deleter)>& callback,
-      uint32_t average_entries_per_lock, uint32_t* state) override;
+  virtual void ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                                      bool thread_safe) override;

  virtual void EraseUnRefEntries() override;

@@ -358,27 +239,10 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard final : public CacheShard {
  //  not threadsafe
  size_t TEST_GetLRUSize();

-  //  Retrieves high pri pool ratio
+  //  Retrives high pri pool ratio
  double GetHighPriPoolRatio();

 private:
-  friend class LRUCache;
-  // Insert an item into the hash table and, if handle is null, insert into
-  // the LRU list. Older items are evicted as necessary. If the cache is full
-  // and free_handle_on_fail is true, the item is deleted and handle is set to.
-  Status InsertItem(LRUHandle* item, Cache::Handle** handle,
-                    bool free_handle_on_fail);
-  Status Insert(const Slice& key, uint32_t hash, void* value, size_t charge,
-                DeleterFn deleter, const Cache::CacheItemHelper* helper,
-                Cache::Handle** handle, Cache::Priority priority);
-  // Promote an item looked up from the secondary cache to the LRU cache. The
-  // item is only inserted into the hash table and not the LRU list, and only
-  // if the cache is not at full capacity, as is the case during Insert.  The
-  // caller should hold a reference on the LRUHandle. When the caller releases
-  // the last reference, the item is added to the LRU list.
-  // The item is promoted to the high pri or low pri pool as specified by the
-  // caller in Lookup.
-  void Promote(LRUHandle* e);
  void LRU_Remove(LRUHandle* e);
  void LRU_Insert(LRUHandle* e);

@@ -439,8 +303,6 @@ class ALIGN_AS(CACHE_LINE_SIZE) LRUCacheShard final : public CacheShard {
  // We don't count mutex_ as the cache's internal state so semantically we
  // don't mind mutex_ invoking the non-const actions.
  mutable port::Mutex mutex_;
-
-  std::shared_ptr<SecondaryCache> secondary_cache_;
 };

 class LRUCache
@@ -454,28 +316,24 @@ class LRUCache
           std::shared_ptr<MemoryAllocator> memory_allocator = nullptr,
           bool use_adaptive_mutex = kDefaultToAdaptiveMutex,
           CacheMetadataChargePolicy metadata_charge_policy =
-               kDontChargeCacheMetadata,
-           const std::shared_ptr<SecondaryCache>& secondary_cache = nullptr);
+               kDontChargeCacheMetadata);
  virtual ~LRUCache();
  virtual const char* Name() const override { return "LRUCache"; }
-  virtual CacheShard* GetShard(uint32_t shard) override;
-  virtual const CacheShard* GetShard(uint32_t shard) const override;
+  virtual CacheShard* GetShard(int shard) override;
+  virtual const CacheShard* GetShard(int shard) const override;
  virtual void* Value(Handle* handle) override;
  virtual size_t GetCharge(Handle* handle) const override;
  virtual uint32_t GetHash(Handle* handle) const override;
-  virtual DeleterFn GetDeleter(Handle* handle) const override;
  virtual void DisownData() override;
-  virtual void WaitAll(std::vector<Handle*>& handles) override;

  //  Retrieves number of elements in LRU, for unit test purpose only
  size_t TEST_GetLRUSize();
-  //  Retrieves high pri pool ratio
+  //  Retrives high pri pool ratio
  double GetHighPriPoolRatio();

 private:
  LRUCacheShard* shards_ = nullptr;
  int num_shards_ = 0;
-  std::shared_ptr<SecondaryCache> secondary_cache_;
 };

 }  // namespace ROCKSDB_NAMESPACE
@@ -9,96 +9,53 @@

 #include "cache/sharded_cache.h"

-#include <algorithm>
-#include <cstdint>
-#include <memory>
+#include <string>

-#include "util/hash.h"
-#include "util/math.h"
 #include "util/mutexlock.h"

 namespace ROCKSDB_NAMESPACE {

-namespace {
-
-inline uint32_t HashSlice(const Slice& s) {
-  return Lower32of64(GetSliceNPHash64(s));
-}
-
-}  // namespace
-
 ShardedCache::ShardedCache(size_t capacity, int num_shard_bits,
                           bool strict_capacity_limit,
                           std::shared_ptr<MemoryAllocator> allocator)
    : Cache(std::move(allocator)),
-      shard_mask_((uint32_t{1} << num_shard_bits) - 1),
+      num_shard_bits_(num_shard_bits),
      capacity_(capacity),
      strict_capacity_limit_(strict_capacity_limit),
      last_id_(1) {}

 void ShardedCache::SetCapacity(size_t capacity) {
-  uint32_t num_shards = GetNumShards();
+  int num_shards = 1 << num_shard_bits_;
  const size_t per_shard = (capacity + (num_shards - 1)) / num_shards;
  MutexLock l(&capacity_mutex_);
-  for (uint32_t s = 0; s < num_shards; s++) {
+  for (int s = 0; s < num_shards; s++) {
    GetShard(s)->SetCapacity(per_shard);
  }
  capacity_ = capacity;
 }

 void ShardedCache::SetStrictCapacityLimit(bool strict_capacity_limit) {
-  uint32_t num_shards = GetNumShards();
+  int num_shards = 1 << num_shard_bits_;
  MutexLock l(&capacity_mutex_);
-  for (uint32_t s = 0; s < num_shards; s++) {
+  for (int s = 0; s < num_shards; s++) {
    GetShard(s)->SetStrictCapacityLimit(strict_capacity_limit);
  }
  strict_capacity_limit_ = strict_capacity_limit;
 }

 Status ShardedCache::Insert(const Slice& key, void* value, size_t charge,
-                            DeleterFn deleter, Handle** handle,
-                            Priority priority) {
+                            void (*deleter)(const Slice& key, void* value),
+                            Handle** handle, Priority priority) {
  uint32_t hash = HashSlice(key);
  return GetShard(Shard(hash))
      ->Insert(key, hash, value, charge, deleter, handle, priority);
 }

-Status ShardedCache::Insert(const Slice& key, void* value,
-                            const CacheItemHelper* helper, size_t charge,
-                            Handle** handle, Priority priority) {
-  uint32_t hash = HashSlice(key);
-  if (!helper) {
-    return Status::InvalidArgument();
-  }
-  return GetShard(Shard(hash))
-      ->Insert(key, hash, value, helper, charge, handle, priority);
-}
-
 Cache::Handle* ShardedCache::Lookup(const Slice& key, Statistics* /*stats*/) {
  uint32_t hash = HashSlice(key);
  return GetShard(Shard(hash))->Lookup(key, hash);
 }

-Cache::Handle* ShardedCache::Lookup(const Slice& key,
-                                    const CacheItemHelper* helper,
-                                    const CreateCallback& create_cb,
-                                    Priority priority, bool wait,
-                                    Statistics* stats) {
-  uint32_t hash = HashSlice(key);
-  return GetShard(Shard(hash))
-      ->Lookup(key, hash, helper, create_cb, priority, wait, stats);
-}
-
-bool ShardedCache::IsReady(Handle* handle) {
-  uint32_t hash = GetHash(handle);
-  return GetShard(Shard(hash))->IsReady(handle);
-}
-
-void ShardedCache::Wait(Handle* handle) {
-  uint32_t hash = GetHash(handle);
-  GetShard(Shard(hash))->Wait(handle);
-}
-
 bool ShardedCache::Ref(Handle* handle) {
  uint32_t hash = GetHash(handle);
  return GetShard(Shard(hash))->Ref(handle);
@@ -109,11 +66,6 @@ bool ShardedCache::Release(Handle* handle, bool force_erase) {
  return GetShard(Shard(hash))->Release(handle, force_erase);
 }

-bool ShardedCache::Release(Handle* handle, bool useful, bool force_erase) {
-  uint32_t hash = GetHash(handle);
-  return GetShard(Shard(hash))->Release(handle, useful, force_erase);
-}
-
 void ShardedCache::Erase(const Slice& key) {
  uint32_t hash = HashSlice(key);
  GetShard(Shard(hash))->Erase(key, hash);
@@ -135,9 +87,9 @@ bool ShardedCache::HasStrictCapacityLimit() const {

 size_t ShardedCache::GetUsage() const {
  // We will not lock the cache when getting the usage from shards.
-  uint32_t num_shards = GetNumShards();
+  int num_shards = 1 << num_shard_bits_;
  size_t usage = 0;
-  for (uint32_t s = 0; s < num_shards; s++) {
+  for (int s = 0; s < num_shards; s++) {
    usage += GetShard(s)->GetUsage();
  }
  return usage;
@@ -149,42 +101,25 @@ size_t ShardedCache::GetUsage(Handle* handle) const {

 size_t ShardedCache::GetPinnedUsage() const {
  // We will not lock the cache when getting the usage from shards.
-  uint32_t num_shards = GetNumShards();
+  int num_shards = 1 << num_shard_bits_;
  size_t usage = 0;
-  for (uint32_t s = 0; s < num_shards; s++) {
+  for (int s = 0; s < num_shards; s++) {
    usage += GetShard(s)->GetPinnedUsage();
  }
  return usage;
 }

-void ShardedCache::ApplyToAllEntries(
-    const std::function<void(const Slice& key, void* value, size_t charge,
-                             DeleterFn deleter)>& callback,
-    const ApplyToAllEntriesOptions& opts) {
-  uint32_t num_shards = GetNumShards();
-  // Iterate over part of each shard, rotating between shards, to
-  // minimize impact on latency of concurrent operations.
-  std::unique_ptr<uint32_t[]> states(new uint32_t[num_shards]{});
-
-  uint32_t aepl_in_32 = static_cast<uint32_t>(
-      std::min(size_t{UINT32_MAX}, opts.average_entries_per_lock));
-  aepl_in_32 = std::min(aepl_in_32, uint32_t{1});
-
-  bool remaining_work;
-  do {
-    remaining_work = false;
-    for (uint32_t s = 0; s < num_shards; s++) {
-      if (states[s] != UINT32_MAX) {
-        GetShard(s)->ApplyToSomeEntries(callback, aepl_in_32, &states[s]);
-        remaining_work |= states[s] != UINT32_MAX;
-      }
-    }
-  } while (remaining_work);
+void ShardedCache::ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                                          bool thread_safe) {
+  int num_shards = 1 << num_shard_bits_;
+  for (int s = 0; s < num_shards; s++) {
+    GetShard(s)->ApplyToAllCacheEntries(callback, thread_safe);
+  }
 }

 void ShardedCache::EraseUnRefEntries() {
-  uint32_t num_shards = GetNumShards();
-  for (uint32_t s = 0; s < num_shards; s++) {
+  int num_shards = 1 << num_shard_bits_;
+  for (int s = 0; s < num_shards; s++) {
    GetShard(s)->EraseUnRefEntries();
  }
 }
@@ -199,8 +134,7 @@ std::string ShardedCache::GetPrintableOptions() const {
    snprintf(buffer, kBufferSize, "    capacity : %" ROCKSDB_PRIszt "\n",
             capacity_);
    ret.append(buffer);
-    snprintf(buffer, kBufferSize, "    num_shard_bits : %d\n",
-             GetNumShardBits());
+    snprintf(buffer, kBufferSize, "    num_shard_bits : %d\n", num_shard_bits_);
    ret.append(buffer);
    snprintf(buffer, kBufferSize, "    strict_capacity_limit : %d\n",
             strict_capacity_limit_);
@@ -225,8 +159,4 @@ int GetDefaultCacheShardBits(size_t capacity) {
  return num_shard_bits;
 }

-int ShardedCache::GetNumShardBits() const { return BitsSetToOne(shard_mask_); }
-
-uint32_t ShardedCache::GetNumShards() const { return shard_mask_ + 1; }
-
 }  // namespace ROCKSDB_NAMESPACE
@@ -14,6 +14,7 @@

 #include "port/port.h"
 #include "rocksdb/cache.h"
+#include "util/hash.h"

 namespace ROCKSDB_NAMESPACE {

@@ -23,38 +24,20 @@ class CacheShard {
  CacheShard() = default;
  virtual ~CacheShard() = default;

-  using DeleterFn = Cache::DeleterFn;
  virtual Status Insert(const Slice& key, uint32_t hash, void* value,
-                        size_t charge, DeleterFn deleter,
-                        Cache::Handle** handle, Cache::Priority priority) = 0;
-  virtual Status Insert(const Slice& key, uint32_t hash, void* value,
-                        const Cache::CacheItemHelper* helper, size_t charge,
+                        size_t charge,
+                        void (*deleter)(const Slice& key, void* value),
                        Cache::Handle** handle, Cache::Priority priority) = 0;
  virtual Cache::Handle* Lookup(const Slice& key, uint32_t hash) = 0;
-  virtual Cache::Handle* Lookup(const Slice& key, uint32_t hash,
-                                const Cache::CacheItemHelper* helper,
-                                const Cache::CreateCallback& create_cb,
-                                Cache::Priority priority, bool wait,
-                                Statistics* stats) = 0;
-  virtual bool Release(Cache::Handle* handle, bool useful,
-                       bool force_erase) = 0;
-  virtual bool IsReady(Cache::Handle* handle) = 0;
-  virtual void Wait(Cache::Handle* handle) = 0;
  virtual bool Ref(Cache::Handle* handle) = 0;
-  virtual bool Release(Cache::Handle* handle, bool force_erase) = 0;
+  virtual bool Release(Cache::Handle* handle, bool force_erase = false) = 0;
  virtual void Erase(const Slice& key, uint32_t hash) = 0;
  virtual void SetCapacity(size_t capacity) = 0;
  virtual void SetStrictCapacityLimit(bool strict_capacity_limit) = 0;
  virtual size_t GetUsage() const = 0;
  virtual size_t GetPinnedUsage() const = 0;
-  // Handles iterating over roughly `average_entries_per_lock` entries, using
-  // `state` to somehow record where it last ended up. Caller initially uses
-  // *state == 0 and implementation sets *state = UINT32_MAX to indicate
-  // completion.
-  virtual void ApplyToSomeEntries(
-      const std::function<void(const Slice& key, void* value, size_t charge,
-                               DeleterFn deleter)>& callback,
-      uint32_t average_entries_per_lock, uint32_t* state) = 0;
+  virtual void ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                                      bool thread_safe) = 0;
  virtual void EraseUnRefEntries() = 0;
  virtual std::string GetPrintableOptions() const { return ""; }
  void set_metadata_charge_policy(
@@ -74,29 +57,22 @@ class ShardedCache : public Cache {
  ShardedCache(size_t capacity, int num_shard_bits, bool strict_capacity_limit,
               std::shared_ptr<MemoryAllocator> memory_allocator = nullptr);
  virtual ~ShardedCache() = default;
-  virtual CacheShard* GetShard(uint32_t shard) = 0;
-  virtual const CacheShard* GetShard(uint32_t shard) const = 0;
+  virtual const char* Name() const override = 0;
+  virtual CacheShard* GetShard(int shard) = 0;
+  virtual const CacheShard* GetShard(int shard) const = 0;
+  virtual void* Value(Handle* handle) override = 0;
+  virtual size_t GetCharge(Handle* handle) const override = 0;

  virtual uint32_t GetHash(Handle* handle) const = 0;
+  virtual void DisownData() override = 0;

  virtual void SetCapacity(size_t capacity) override;
  virtual void SetStrictCapacityLimit(bool strict_capacity_limit) override;

  virtual Status Insert(const Slice& key, void* value, size_t charge,
-                        DeleterFn deleter, Handle** handle,
-                        Priority priority) override;
-  virtual Status Insert(const Slice& key, void* value,
-                        const CacheItemHelper* helper, size_t chargge,
-                        Handle** handle = nullptr,
-                        Priority priority = Priority::LOW) override;
+                        void (*deleter)(const Slice& key, void* value),
+                        Handle** handle, Priority priority) override;
  virtual Handle* Lookup(const Slice& key, Statistics* stats) override;
-  virtual Handle* Lookup(const Slice& key, const CacheItemHelper* helper,
-                         const CreateCallback& create_cb, Priority priority,
-                         bool wait, Statistics* stats = nullptr) override;
-  virtual bool Release(Handle* handle, bool useful,
-                       bool force_erase = false) override;
-  virtual bool IsReady(Handle* handle) override;
-  virtual void Wait(Handle* handle) override;
  virtual bool Ref(Handle* handle) override;
  virtual bool Release(Handle* handle, bool force_erase = false) override;
  virtual void Erase(const Slice& key) override;
@@ -106,21 +82,24 @@ class ShardedCache : public Cache {
  virtual size_t GetUsage() const override;
  virtual size_t GetUsage(Handle* handle) const override;
  virtual size_t GetPinnedUsage() const override;
-  virtual void ApplyToAllEntries(
-      const std::function<void(const Slice& key, void* value, size_t charge,
-                               DeleterFn deleter)>& callback,
-      const ApplyToAllEntriesOptions& opts) override;
+  virtual void ApplyToAllCacheEntries(void (*callback)(void*, size_t),
+                                      bool thread_safe) override;
  virtual void EraseUnRefEntries() override;
  virtual std::string GetPrintableOptions() const override;

-  int GetNumShardBits() const;
-  uint32_t GetNumShards() const;
-
- protected:
-  inline uint32_t Shard(uint32_t hash) { return hash & shard_mask_; }
+  int GetNumShardBits() const { return num_shard_bits_; }

 private:
-  const uint32_t shard_mask_;
+  static inline uint32_t HashSlice(const Slice& s) {
+    return static_cast<uint32_t>(GetSliceNPHash64(s));
+  }
+
+  uint32_t Shard(uint32_t hash) {
+    // Note, hash >> 32 yields hash in gcc, not the zero we expect!
+    return (num_shard_bits_ > 0) ? (hash >> (32 - num_shard_bits_)) : 0;
+  }
+
+  int num_shard_bits_;
  mutable port::Mutex capacity_mutex_;
  size_t capacity_;
  bool strict_capacity_limit_;
@@ -24,7 +24,7 @@ mkdir -p $COVERAGE_DIR

 # Find all gcno files to generate the coverage report

-PYTHON=${1:-`which python3`}
+PYTHON=${1:-`which python`}
 echo -e "Using $PYTHON"
 GCNO_FILES=`find $ROOT -name "*.gcno"`
 $GCOV --preserve-paths --relative-only --no-output $GCNO_FILES 2>/dev/null |
@@ -30,18 +30,20 @@ Status ArenaWrappedDBIter::GetProperty(std::string prop_name,
  return db_iter_->GetProperty(prop_name, prop);
 }

-void ArenaWrappedDBIter::Init(
-    Env* env, const ReadOptions& read_options, const ImmutableOptions& ioptions,
-    const MutableCFOptions& mutable_cf_options, const Version* version,
-    const SequenceNumber& sequence, uint64_t max_sequential_skip_in_iteration,
-    uint64_t version_number, ReadCallback* read_callback, DBImpl* db_impl,
-    ColumnFamilyData* cfd, bool expose_blob_index, bool allow_refresh) {
+void ArenaWrappedDBIter::Init(Env* env, const ReadOptions& read_options,
+                              const ImmutableCFOptions& cf_options,
+                              const MutableCFOptions& mutable_cf_options,
+                              const SequenceNumber& sequence,
+                              uint64_t max_sequential_skip_in_iteration,
+                              uint64_t version_number,
+                              ReadCallback* read_callback, DBImpl* db_impl,
+                              ColumnFamilyData* cfd, bool allow_blob,
+                              bool allow_refresh) {
  auto mem = arena_.AllocateAligned(sizeof(DBIter));
-  db_iter_ =
-      new (mem) DBIter(env, read_options, ioptions, mutable_cf_options,
-                       ioptions.user_comparator, /* iter */ nullptr, version,
-                       sequence, true, max_sequential_skip_in_iteration,
-                       read_callback, db_impl, cfd, expose_blob_index);
+  db_iter_ = new (mem) DBIter(env, read_options, cf_options, mutable_cf_options,
+                              cf_options.user_comparator, nullptr, sequence,
+                              true, max_sequential_skip_in_iteration,
+                              read_callback, db_impl, cfd, allow_blob);
  sv_number_ = version_number;
  read_options_ = read_options;
  allow_refresh_ = allow_refresh;
@@ -70,9 +72,8 @@ Status ArenaWrappedDBIter::Refresh() {
      read_callback_->Refresh(latest_seq);
    }
    Init(env, read_options_, *(cfd_->ioptions()), sv->mutable_cf_options,
-         sv->current, latest_seq,
-         sv->mutable_cf_options.max_sequential_skip_in_iterations,
-         cur_sv_number, read_callback_, db_impl_, cfd_, expose_blob_index_,
+         latest_seq, sv->mutable_cf_options.max_sequential_skip_in_iterations,
+         cur_sv_number, read_callback_, db_impl_, cfd_, allow_blob_,
         allow_refresh_);

    InternalIterator* internal_iter = db_impl_->NewInternalIterator(
@@ -87,17 +88,18 @@ Status ArenaWrappedDBIter::Refresh() {
 }

 ArenaWrappedDBIter* NewArenaWrappedDbIterator(
-    Env* env, const ReadOptions& read_options, const ImmutableOptions& ioptions,
-    const MutableCFOptions& mutable_cf_options, const Version* version,
-    const SequenceNumber& sequence, uint64_t max_sequential_skip_in_iterations,
-    uint64_t version_number, ReadCallback* read_callback, DBImpl* db_impl,
-    ColumnFamilyData* cfd, bool expose_blob_index, bool allow_refresh) {
+    Env* env, const ReadOptions& read_options,
+    const ImmutableCFOptions& cf_options,
+    const MutableCFOptions& mutable_cf_options, const SequenceNumber& sequence,
+    uint64_t max_sequential_skip_in_iterations, uint64_t version_number,
+    ReadCallback* read_callback, DBImpl* db_impl, ColumnFamilyData* cfd,
+    bool allow_blob, bool allow_refresh) {
  ArenaWrappedDBIter* iter = new ArenaWrappedDBIter();
-  iter->Init(env, read_options, ioptions, mutable_cf_options, version, sequence,
+  iter->Init(env, read_options, cf_options, mutable_cf_options, sequence,
             max_sequential_skip_in_iterations, version_number, read_callback,
-             db_impl, cfd, expose_blob_index, allow_refresh);
+             db_impl, cfd, allow_blob, allow_refresh);
  if (db_impl != nullptr && cfd != nullptr && allow_refresh) {
-    iter->StoreRefreshInfo(db_impl, cfd, read_callback, expose_blob_index);
+    iter->StoreRefreshInfo(db_impl, cfd, read_callback, allow_blob);
  }

  return iter;
@@ -12,6 +12,7 @@
 #include <string>
 #include "db/db_impl/db_impl.h"
 #include "db/db_iter.h"
+#include "db/dbformat.h"
 #include "db/range_del_aggregator.h"
 #include "memory/arena.h"
 #include "options/cf_options.h"
@@ -22,7 +23,6 @@
 namespace ROCKSDB_NAMESPACE {

 class Arena;
-class Version;

 // A wrapper iterator which wraps DB Iterator and the arena, with which the DB
 // iterator is supposed to be allocated. This class is used as an entry point of
@@ -33,13 +33,7 @@ class Version;
 // the same as the inner DBIter.
 class ArenaWrappedDBIter : public Iterator {
 public:
-  ~ArenaWrappedDBIter() override {
-    if (db_iter_ != nullptr) {
-      db_iter_->~DBIter();
-    } else {
-      assert(false);
-    }
-  }
+  virtual ~ArenaWrappedDBIter() { db_iter_->~DBIter(); }

  // Get the arena to be used to allocate memory for DBIter to be wrapped,
  // as well as child iterators in it.
@@ -77,32 +71,32 @@ class ArenaWrappedDBIter : public Iterator {
  Status Refresh() override;

  void Init(Env* env, const ReadOptions& read_options,
-            const ImmutableOptions& ioptions,
-            const MutableCFOptions& mutable_cf_options, const Version* version,
+            const ImmutableCFOptions& cf_options,
+            const MutableCFOptions& mutable_cf_options,
            const SequenceNumber& sequence,
            uint64_t max_sequential_skip_in_iterations, uint64_t version_number,
            ReadCallback* read_callback, DBImpl* db_impl, ColumnFamilyData* cfd,
-            bool expose_blob_index, bool allow_refresh);
+            bool allow_blob, bool allow_refresh);

  // Store some parameters so we can refresh the iterator at a later point
  // with these same params
  void StoreRefreshInfo(DBImpl* db_impl, ColumnFamilyData* cfd,
-                        ReadCallback* read_callback, bool expose_blob_index) {
+                        ReadCallback* read_callback, bool allow_blob) {
    db_impl_ = db_impl;
    cfd_ = cfd;
    read_callback_ = read_callback;
-    expose_blob_index_ = expose_blob_index;
+    allow_blob_ = allow_blob;
  }

 private:
-  DBIter* db_iter_ = nullptr;
+  DBIter* db_iter_;
  Arena arena_;
  uint64_t sv_number_;
  ColumnFamilyData* cfd_ = nullptr;
  DBImpl* db_impl_ = nullptr;
  ReadOptions read_options_;
  ReadCallback* read_callback_;
-  bool expose_blob_index_ = false;
+  bool allow_blob_ = false;
  bool allow_refresh_ = true;
 };

@@ -110,10 +104,11 @@ class ArenaWrappedDBIter : public Iterator {
 // `db_impl` and `cfd` are used for reneweal. If left null, renewal will not
 // be supported.
 extern ArenaWrappedDBIter* NewArenaWrappedDbIterator(
-    Env* env, const ReadOptions& read_options, const ImmutableOptions& ioptions,
-    const MutableCFOptions& mutable_cf_options, const Version* version,
-    const SequenceNumber& sequence, uint64_t max_sequential_skip_in_iterations,
-    uint64_t version_number, ReadCallback* read_callback,
-    DBImpl* db_impl = nullptr, ColumnFamilyData* cfd = nullptr,
-    bool expose_blob_index = false, bool allow_refresh = true);
+    Env* env, const ReadOptions& read_options,
+    const ImmutableCFOptions& cf_options,
+    const MutableCFOptions& mutable_cf_options, const SequenceNumber& sequence,
+    uint64_t max_sequential_skip_in_iterations, uint64_t version_number,
+    ReadCallback* read_callback, DBImpl* db_impl = nullptr,
+    ColumnFamilyData* cfd = nullptr, bool allow_blob = false,
+    bool allow_refresh = true);
 }  // namespace ROCKSDB_NAMESPACE
@@ -1,146 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <cassert>
-
-#include "db/blob/blob_garbage_meter.h"
-#include "rocksdb/rocksdb_namespace.h"
-#include "rocksdb/status.h"
-#include "table/internal_iterator.h"
-#include "test_util/sync_point.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// An internal iterator that passes each key-value encountered to
-// BlobGarbageMeter as inflow in order to measure the total number and size of
-// blobs in the compaction input on a per-blob file basis.
-class BlobCountingIterator : public InternalIterator {
- public:
-  BlobCountingIterator(InternalIterator* iter,
-                       BlobGarbageMeter* blob_garbage_meter)
-      : iter_(iter), blob_garbage_meter_(blob_garbage_meter) {
-    assert(iter_);
-    assert(blob_garbage_meter_);
-
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  bool Valid() const override { return iter_->Valid() && status_.ok(); }
-
-  void SeekToFirst() override {
-    iter_->SeekToFirst();
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  void SeekToLast() override {
-    iter_->SeekToLast();
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  void Seek(const Slice& target) override {
-    iter_->Seek(target);
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  void SeekForPrev(const Slice& target) override {
-    iter_->SeekForPrev(target);
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  void Next() override {
-    assert(Valid());
-
-    iter_->Next();
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  bool NextAndGetResult(IterateResult* result) override {
-    assert(Valid());
-
-    const bool res = iter_->NextAndGetResult(result);
-    UpdateAndCountBlobIfNeeded();
-    return res;
-  }
-
-  void Prev() override {
-    assert(Valid());
-
-    iter_->Prev();
-    UpdateAndCountBlobIfNeeded();
-  }
-
-  Slice key() const override {
-    assert(Valid());
-    return iter_->key();
-  }
-
-  Slice user_key() const override {
-    assert(Valid());
-    return iter_->user_key();
-  }
-
-  Slice value() const override {
-    assert(Valid());
-    return iter_->value();
-  }
-
-  Status status() const override { return status_; }
-
-  bool PrepareValue() override {
-    assert(Valid());
-    return iter_->PrepareValue();
-  }
-
-  bool MayBeOutOfLowerBound() override {
-    assert(Valid());
-    return iter_->MayBeOutOfLowerBound();
-  }
-
-  IterBoundCheck UpperBoundCheckResult() override {
-    assert(Valid());
-    return iter_->UpperBoundCheckResult();
-  }
-
-  void SetPinnedItersMgr(PinnedIteratorsManager* pinned_iters_mgr) override {
-    iter_->SetPinnedItersMgr(pinned_iters_mgr);
-  }
-
-  bool IsKeyPinned() const override {
-    assert(Valid());
-    return iter_->IsKeyPinned();
-  }
-
-  bool IsValuePinned() const override {
-    assert(Valid());
-    return iter_->IsValuePinned();
-  }
-
-  Status GetProperty(std::string prop_name, std::string* prop) override {
-    return iter_->GetProperty(prop_name, prop);
-  }
-
- private:
-  void UpdateAndCountBlobIfNeeded() {
-    assert(!iter_->Valid() || iter_->status().ok());
-
-    if (!iter_->Valid()) {
-      status_ = iter_->status();
-      return;
-    }
-
-    TEST_SYNC_POINT(
-        "BlobCountingIterator::UpdateAndCountBlobIfNeeded:ProcessInFlow");
-
-    status_ = blob_garbage_meter_->ProcessInFlow(key(), value());
-  }
-
-  InternalIterator* iter_;
-  BlobGarbageMeter* blob_garbage_meter_;
-  Status status_;
-};
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,326 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_counting_iterator.h"
-
-#include <string>
-#include <vector>
-
-#include "db/blob/blob_garbage_meter.h"
-#include "db/blob/blob_index.h"
-#include "db/blob/blob_log_format.h"
-#include "db/dbformat.h"
-#include "test_util/testharness.h"
-#include "test_util/testutil.h"
-#include "util/vector_iterator.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-void CheckInFlow(const BlobGarbageMeter& blob_garbage_meter,
-                 uint64_t blob_file_number, uint64_t count, uint64_t bytes) {
-  const auto& flows = blob_garbage_meter.flows();
-
-  const auto it = flows.find(blob_file_number);
-  if (it == flows.end()) {
-    ASSERT_EQ(count, 0);
-    ASSERT_EQ(bytes, 0);
-    return;
-  }
-
-  const auto& in = it->second.GetInFlow();
-
-  ASSERT_EQ(in.GetCount(), count);
-  ASSERT_EQ(in.GetBytes(), bytes);
-}
-
-TEST(BlobCountingIteratorTest, CountBlobs) {
-  // Note: the input consists of three key-values: two are blob references to
-  // different blob files, while the third one is a plain value.
-  constexpr char user_key0[] = "key0";
-  constexpr char user_key1[] = "key1";
-  constexpr char user_key2[] = "key2";
-
-  const std::vector<std::string> keys{
-      test::KeyStr(user_key0, 1, kTypeBlobIndex),
-      test::KeyStr(user_key1, 2, kTypeBlobIndex),
-      test::KeyStr(user_key2, 3, kTypeValue)};
-
-  constexpr uint64_t first_blob_file_number = 4;
-  constexpr uint64_t first_offset = 1000;
-  constexpr uint64_t first_size = 2000;
-
-  std::string first_blob_index;
-  BlobIndex::EncodeBlob(&first_blob_index, first_blob_file_number, first_offset,
-                        first_size, kNoCompression);
-
-  constexpr uint64_t second_blob_file_number = 6;
-  constexpr uint64_t second_offset = 2000;
-  constexpr uint64_t second_size = 4000;
-
-  std::string second_blob_index;
-  BlobIndex::EncodeBlob(&second_blob_index, second_blob_file_number,
-                        second_offset, second_size, kNoCompression);
-
-  const std::vector<std::string> values{first_blob_index, second_blob_index,
-                                        "raw_value"};
-
-  assert(keys.size() == values.size());
-
-  VectorIterator input(keys, values);
-  BlobGarbageMeter blob_garbage_meter;
-
-  BlobCountingIterator blob_counter(&input, &blob_garbage_meter);
-
-  constexpr uint64_t first_expected_bytes =
-      first_size +
-      BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(user_key0) - 1);
-  constexpr uint64_t second_expected_bytes =
-      second_size +
-      BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(user_key1) - 1);
-
-  // Call SeekToFirst and iterate forward
-  blob_counter.SeekToFirst();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[0]);
-  ASSERT_EQ(blob_counter.user_key(), user_key0);
-  ASSERT_EQ(blob_counter.value(), values[0]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 1,
-              first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 0, 0);
-
-  blob_counter.Next();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[1]);
-  ASSERT_EQ(blob_counter.user_key(), user_key1);
-  ASSERT_EQ(blob_counter.value(), values[1]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 1,
-              first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 1,
-              second_expected_bytes);
-
-  blob_counter.Next();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[2]);
-  ASSERT_EQ(blob_counter.user_key(), user_key2);
-  ASSERT_EQ(blob_counter.value(), values[2]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 1,
-              first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 1,
-              second_expected_bytes);
-
-  blob_counter.Next();
-  ASSERT_FALSE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 1,
-              first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 1,
-              second_expected_bytes);
-
-  // Do it again using NextAndGetResult
-  blob_counter.SeekToFirst();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[0]);
-  ASSERT_EQ(blob_counter.user_key(), user_key0);
-  ASSERT_EQ(blob_counter.value(), values[0]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 2,
-              2 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 1,
-              second_expected_bytes);
-
-  {
-    IterateResult result;
-    ASSERT_TRUE(blob_counter.NextAndGetResult(&result));
-    ASSERT_EQ(result.key, keys[1]);
-    ASSERT_EQ(blob_counter.user_key(), user_key1);
-    ASSERT_TRUE(blob_counter.Valid());
-    ASSERT_OK(blob_counter.status());
-    ASSERT_EQ(blob_counter.key(), keys[1]);
-    ASSERT_EQ(blob_counter.value(), values[1]);
-    CheckInFlow(blob_garbage_meter, first_blob_file_number, 2,
-                2 * first_expected_bytes);
-    CheckInFlow(blob_garbage_meter, second_blob_file_number, 2,
-                2 * second_expected_bytes);
-  }
-
-  {
-    IterateResult result;
-    ASSERT_TRUE(blob_counter.NextAndGetResult(&result));
-    ASSERT_EQ(result.key, keys[2]);
-    ASSERT_EQ(blob_counter.user_key(), user_key2);
-    ASSERT_TRUE(blob_counter.Valid());
-    ASSERT_OK(blob_counter.status());
-    ASSERT_EQ(blob_counter.key(), keys[2]);
-    ASSERT_EQ(blob_counter.value(), values[2]);
-    CheckInFlow(blob_garbage_meter, first_blob_file_number, 2,
-                2 * first_expected_bytes);
-    CheckInFlow(blob_garbage_meter, second_blob_file_number, 2,
-                2 * second_expected_bytes);
-  }
-
-  {
-    IterateResult result;
-    ASSERT_FALSE(blob_counter.NextAndGetResult(&result));
-    ASSERT_FALSE(blob_counter.Valid());
-    ASSERT_OK(blob_counter.status());
-    CheckInFlow(blob_garbage_meter, first_blob_file_number, 2,
-                2 * first_expected_bytes);
-    CheckInFlow(blob_garbage_meter, second_blob_file_number, 2,
-                2 * second_expected_bytes);
-  }
-
-  // Call SeekToLast and iterate backward
-  blob_counter.SeekToLast();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[2]);
-  ASSERT_EQ(blob_counter.user_key(), user_key2);
-  ASSERT_EQ(blob_counter.value(), values[2]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 2,
-              2 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 2,
-              2 * second_expected_bytes);
-
-  blob_counter.Prev();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[1]);
-  ASSERT_EQ(blob_counter.user_key(), user_key1);
-  ASSERT_EQ(blob_counter.value(), values[1]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 2,
-              2 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 3,
-              3 * second_expected_bytes);
-
-  blob_counter.Prev();
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[0]);
-  ASSERT_EQ(blob_counter.user_key(), user_key0);
-  ASSERT_EQ(blob_counter.value(), values[0]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 3,
-              3 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 3,
-              3 * second_expected_bytes);
-
-  blob_counter.Prev();
-  ASSERT_FALSE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 3,
-              3 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 3,
-              3 * second_expected_bytes);
-
-  // Call Seek for all keys (plus one that's greater than all of them)
-  blob_counter.Seek(keys[0]);
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[0]);
-  ASSERT_EQ(blob_counter.user_key(), user_key0);
-  ASSERT_EQ(blob_counter.value(), values[0]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 4,
-              4 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 3,
-              3 * second_expected_bytes);
-
-  blob_counter.Seek(keys[1]);
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[1]);
-  ASSERT_EQ(blob_counter.user_key(), user_key1);
-  ASSERT_EQ(blob_counter.value(), values[1]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 4,
-              4 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 4,
-              4 * second_expected_bytes);
-
-  blob_counter.Seek(keys[2]);
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[2]);
-  ASSERT_EQ(blob_counter.user_key(), user_key2);
-  ASSERT_EQ(blob_counter.value(), values[2]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 4,
-              4 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 4,
-              4 * second_expected_bytes);
-
-  blob_counter.Seek("zzz");
-  ASSERT_FALSE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 4,
-              4 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 4,
-              4 * second_expected_bytes);
-
-  // Call SeekForPrev for all keys (plus one that's less than all of them)
-  blob_counter.SeekForPrev("aaa");
-  ASSERT_FALSE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 4,
-              4 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 4,
-              4 * second_expected_bytes);
-
-  blob_counter.SeekForPrev(keys[0]);
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[0]);
-  ASSERT_EQ(blob_counter.user_key(), user_key0);
-  ASSERT_EQ(blob_counter.value(), values[0]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 5,
-              5 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 4,
-              4 * second_expected_bytes);
-
-  blob_counter.SeekForPrev(keys[1]);
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[1]);
-  ASSERT_EQ(blob_counter.user_key(), user_key1);
-  ASSERT_EQ(blob_counter.value(), values[1]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 5,
-              5 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 5,
-              5 * second_expected_bytes);
-
-  blob_counter.SeekForPrev(keys[2]);
-  ASSERT_TRUE(blob_counter.Valid());
-  ASSERT_OK(blob_counter.status());
-  ASSERT_EQ(blob_counter.key(), keys[2]);
-  ASSERT_EQ(blob_counter.user_key(), user_key2);
-  ASSERT_EQ(blob_counter.value(), values[2]);
-  CheckInFlow(blob_garbage_meter, first_blob_file_number, 5,
-              5 * first_expected_bytes);
-  CheckInFlow(blob_garbage_meter, second_blob_file_number, 5,
-              5 * second_expected_bytes);
-}
-
-TEST(BlobCountingIteratorTest, CorruptBlobIndex) {
-  const std::vector<std::string> keys{
-      test::KeyStr("user_key", 1, kTypeBlobIndex)};
-  const std::vector<std::string> values{"i_am_not_a_blob_index"};
-
-  assert(keys.size() == values.size());
-
-  VectorIterator input(keys, values);
-  BlobGarbageMeter blob_garbage_meter;
-
-  BlobCountingIterator blob_counter(&input, &blob_garbage_meter);
-
-  blob_counter.SeekToFirst();
-  ASSERT_FALSE(blob_counter.Valid());
-  ASSERT_NOK(blob_counter.status());
-}
-
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -1,34 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_fetcher.h"
-
-#include "db/version_set.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-Status BlobFetcher::FetchBlob(const Slice& user_key,
-                              const Slice& blob_index_slice,
-                              FilePrefetchBuffer* prefetch_buffer,
-                              PinnableSlice* blob_value,
-                              uint64_t* bytes_read) const {
-  assert(version_);
-
-  return version_->GetBlob(read_options_, user_key, blob_index_slice,
-                           prefetch_buffer, blob_value, bytes_read);
-}
-
-Status BlobFetcher::FetchBlob(const Slice& user_key,
-                              const BlobIndex& blob_index,
-                              FilePrefetchBuffer* prefetch_buffer,
-                              PinnableSlice* blob_value,
-                              uint64_t* bytes_read) const {
-  assert(version_);
-
-  return version_->GetBlob(read_options_, user_key, blob_index, prefetch_buffer,
-                           blob_value, bytes_read);
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,37 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include "rocksdb/options.h"
-#include "rocksdb/status.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-class Version;
-class Slice;
-class FilePrefetchBuffer;
-class PinnableSlice;
-class BlobIndex;
-
-// A thin wrapper around the blob retrieval functionality of Version.
-class BlobFetcher {
- public:
-  BlobFetcher(const Version* version, const ReadOptions& read_options)
-      : version_(version), read_options_(read_options) {}
-
-  Status FetchBlob(const Slice& user_key, const Slice& blob_index_slice,
-                   FilePrefetchBuffer* prefetch_buffer,
-                   PinnableSlice* blob_value, uint64_t* bytes_read) const;
-
-  Status FetchBlob(const Slice& user_key, const BlobIndex& blob_index,
-                   FilePrefetchBuffer* prefetch_buffer,
-                   PinnableSlice* blob_value, uint64_t* bytes_read) const;
-
- private:
-  const Version* version_;
-  ReadOptions read_options_;
-};
-}  // namespace ROCKSDB_NAMESPACE
@@ -135,8 +135,7 @@ std::ostream& operator<<(std::ostream& os,
     << " total_blob_count: " << blob_file_addition.GetTotalBlobCount()
     << " total_blob_bytes: " << blob_file_addition.GetTotalBlobBytes()
     << " checksum_method: " << blob_file_addition.GetChecksumMethod()
-     << " checksum_value: "
-     << Slice(blob_file_addition.GetChecksumValue()).ToString(/* hex */ true);
+     << " checksum_value: " << blob_file_addition.GetChecksumValue();

  return os;
 }
@@ -147,8 +146,7 @@ JSONWriter& operator<<(JSONWriter& jw,
     << "TotalBlobCount" << blob_file_addition.GetTotalBlobCount()
     << "TotalBlobBytes" << blob_file_addition.GetTotalBlobBytes()
     << "ChecksumMethod" << blob_file_addition.GetChecksumMethod()
-     << "ChecksumValue"
-     << Slice(blob_file_addition.GetChecksumValue()).ToString(/* hex */ true);
+     << "ChecksumValue" << blob_file_addition.GetChecksumValue();

  return jw;
 }
@@ -46,9 +46,7 @@ TEST_F(BlobFileAdditionTest, NonEmpty) {
  constexpr uint64_t total_blob_count = 2;
  constexpr uint64_t total_blob_bytes = 123456;
  const std::string checksum_method("SHA1");
-  const std::string checksum_value(
-      "\xbd\xb7\xf3\x4a\x59\xdf\xa1\x59\x2c\xe7\xf5\x2e\x99\xf9\x8c\x57\x0c\x52"
-      "\x5c\xbd");
+  const std::string checksum_value("bdb7f34a59dfa1592ce7f52e99f98c570c525cbd");

  BlobFileAddition blob_file_addition(blob_file_number, total_blob_count,
                                      total_blob_bytes, checksum_method,
@@ -115,9 +113,7 @@ TEST_F(BlobFileAdditionTest, DecodeErrors) {
    ASSERT_TRUE(std::strstr(s.getState(), "checksum value"));
  }

-  constexpr char checksum_value[] =
-      "\xbd\xb7\xf3\x4a\x59\xdf\xa1\x59\x2c\xe7\xf5\x2e\x99\xf9\x8c\x57\x0c\x52"
-      "\x5c\xbd";
+  constexpr char checksum_value[] = "bdb7f34a59dfa1592ce7f52e99f98c570c525cbd";
  PutLengthPrefixedSlice(&str, checksum_value);
  slice = str;

@@ -154,7 +150,7 @@ TEST_F(BlobFileAdditionTest, ForwardCompatibleCustomField) {
  constexpr uint64_t total_blob_count = 9999;
  constexpr uint64_t total_blob_bytes = 100000000;
  const std::string checksum_method("CRC32");
-  const std::string checksum_value("\x3d\x87\xff\x57");
+  const std::string checksum_value("3d87ff57");

  BlobFileAddition blob_file_addition(blob_file_number, total_blob_count,
                                      total_blob_bytes, checksum_method,
@@ -182,7 +178,7 @@ TEST_F(BlobFileAdditionTest, ForwardIncompatibleCustomField) {
  constexpr uint64_t total_blob_count = 100;
  constexpr uint64_t total_blob_bytes = 2000000;
  const std::string checksum_method("CRC32B");
-  const std::string checksum_value("\x6d\xbd\xf2\x3a");
+  const std::string checksum_value("6dbdf23a");

  BlobFileAddition blob_file_addition(blob_file_number, total_blob_count,
                                      total_blob_bytes, checksum_method,
@@ -8,59 +8,50 @@
 #include <cassert>

 #include "db/blob/blob_file_addition.h"
-#include "db/blob/blob_file_completion_callback.h"
 #include "db/blob/blob_index.h"
 #include "db/blob/blob_log_format.h"
 #include "db/blob/blob_log_writer.h"
-#include "db/event_helpers.h"
 #include "db/version_set.h"
 #include "file/filename.h"
 #include "file/read_write_util.h"
 #include "file/writable_file_writer.h"
 #include "logging/logging.h"
 #include "options/cf_options.h"
-#include "options/options_helper.h"
 #include "rocksdb/slice.h"
 #include "rocksdb/status.h"
 #include "test_util/sync_point.h"
-#include "trace_replay/io_tracer.h"
 #include "util/compression.h"

 namespace ROCKSDB_NAMESPACE {

 BlobFileBuilder::BlobFileBuilder(
-    VersionSet* versions, FileSystem* fs,
-    const ImmutableOptions* immutable_options,
+    VersionSet* versions, Env* env, FileSystem* fs,
+    const ImmutableCFOptions* immutable_cf_options,
    const MutableCFOptions* mutable_cf_options, const FileOptions* file_options,
    int job_id, uint32_t column_family_id,
    const std::string& column_family_name, Env::IOPriority io_priority,
    Env::WriteLifeTimeHint write_hint,
-    const std::shared_ptr<IOTracer>& io_tracer,
-    BlobFileCompletionCallback* blob_callback,
-    BlobFileCreationReason creation_reason,
    std::vector<std::string>* blob_file_paths,
    std::vector<BlobFileAddition>* blob_file_additions)
-    : BlobFileBuilder([versions]() { return versions->NewFileNumber(); }, fs,
-                      immutable_options, mutable_cf_options, file_options,
-                      job_id, column_family_id, column_family_name, io_priority,
-                      write_hint, io_tracer, blob_callback, creation_reason,
+    : BlobFileBuilder([versions]() { return versions->NewFileNumber(); }, env,
+                      fs, immutable_cf_options, mutable_cf_options,
+                      file_options, job_id, column_family_id,
+                      column_family_name, io_priority, write_hint,
                      blob_file_paths, blob_file_additions) {}

 BlobFileBuilder::BlobFileBuilder(
-    std::function<uint64_t()> file_number_generator, FileSystem* fs,
-    const ImmutableOptions* immutable_options,
+    std::function<uint64_t()> file_number_generator, Env* env, FileSystem* fs,
+    const ImmutableCFOptions* immutable_cf_options,
    const MutableCFOptions* mutable_cf_options, const FileOptions* file_options,
    int job_id, uint32_t column_family_id,
    const std::string& column_family_name, Env::IOPriority io_priority,
    Env::WriteLifeTimeHint write_hint,
-    const std::shared_ptr<IOTracer>& io_tracer,
-    BlobFileCompletionCallback* blob_callback,
-    BlobFileCreationReason creation_reason,
    std::vector<std::string>* blob_file_paths,
    std::vector<BlobFileAddition>* blob_file_additions)
    : file_number_generator_(std::move(file_number_generator)),
+      env_(env),
      fs_(fs),
-      immutable_options_(immutable_options),
+      immutable_cf_options_(immutable_cf_options),
      min_blob_size_(mutable_cf_options->min_blob_size),
      blob_file_size_(mutable_cf_options->blob_file_size),
      blob_compression_type_(mutable_cf_options->blob_compression_type),
@@ -70,16 +61,14 @@ BlobFileBuilder::BlobFileBuilder(
      column_family_name_(column_family_name),
      io_priority_(io_priority),
      write_hint_(write_hint),
-      io_tracer_(io_tracer),
-      blob_callback_(blob_callback),
-      creation_reason_(creation_reason),
      blob_file_paths_(blob_file_paths),
      blob_file_additions_(blob_file_additions),
      blob_count_(0),
      blob_bytes_(0) {
  assert(file_number_generator_);
+  assert(env_);
  assert(fs_);
-  assert(immutable_options_);
+  assert(immutable_cf_options_);
  assert(file_options_);
  assert(blob_file_paths_);
  assert(blob_file_paths_->empty());
@@ -160,25 +149,19 @@ Status BlobFileBuilder::OpenBlobFileIfNeeded() {
  assert(file_number_generator_);
  const uint64_t blob_file_number = file_number_generator_();

-  assert(immutable_options_);
-  assert(!immutable_options_->cf_paths.empty());
-  std::string blob_file_path =
-      BlobFileName(immutable_options_->cf_paths.front().path, blob_file_number);
-
-  if (blob_callback_) {
-    blob_callback_->OnBlobFileCreationStarted(
-        blob_file_path, column_family_name_, job_id_, creation_reason_);
-  }
+  assert(immutable_cf_options_);
+  assert(!immutable_cf_options_->cf_paths.empty());
+  std::string blob_file_path = BlobFileName(
+      immutable_cf_options_->cf_paths.front().path, blob_file_number);

  std::unique_ptr<FSWritableFile> file;

  {
+    TEST_SYNC_POINT("BlobFileBuilder::OpenBlobFileIfNeeded:NewWritableFile");
+
    assert(file_options_);
-    Status s = NewWritableFile(fs_, blob_file_path, &file, *file_options_);
-
-    TEST_SYNC_POINT_CALLBACK(
-        "BlobFileBuilder::OpenBlobFileIfNeeded:NewWritableFile", &s);
-
+    const Status s =
+        NewWritableFile(fs_, blob_file_path, &file, *file_options_);
    if (!s.ok()) {
      return s;
    }
@@ -193,20 +176,17 @@ Status BlobFileBuilder::OpenBlobFileIfNeeded() {
  assert(file);
  file->SetIOPriority(io_priority_);
  file->SetWriteLifeTimeHint(write_hint_);
-  FileTypeSet tmp_set = immutable_options_->checksum_handoff_file_types;
-  Statistics* const statistics = immutable_options_->stats;
+
+  Statistics* const statistics = immutable_cf_options_->statistics;
+
  std::unique_ptr<WritableFileWriter> file_writer(new WritableFileWriter(
-      std::move(file), blob_file_paths_->back(), *file_options_,
-      immutable_options_->clock, io_tracer_, statistics,
-      immutable_options_->listeners,
-      immutable_options_->file_checksum_gen_factory.get(),
-      tmp_set.Contains(FileType::kBlobFile), false));
+      std::move(file), blob_file_paths_->back(), *file_options_, env_,
+      nullptr /*IOTracer*/, statistics, immutable_cf_options_->listeners,
+      immutable_cf_options_->file_checksum_gen_factory));

-  constexpr bool do_flush = false;
-
-  std::unique_ptr<BlobLogWriter> blob_log_writer(new BlobLogWriter(
-      std::move(file_writer), immutable_options_->clock, statistics,
-      blob_file_number, immutable_options_->use_fsync, do_flush));
+  std::unique_ptr<BlobLogWriter> blob_log_writer(
+      new BlobLogWriter(std::move(file_writer), env_, statistics,
+                        blob_file_number, immutable_cf_options_->use_fsync));

  constexpr bool has_ttl = false;
  constexpr ExpirationRange expiration_range;
@@ -215,11 +195,9 @@ Status BlobFileBuilder::OpenBlobFileIfNeeded() {
                       expiration_range);

  {
-    Status s = blob_log_writer->WriteHeader(header);
-
-    TEST_SYNC_POINT_CALLBACK(
-        "BlobFileBuilder::OpenBlobFileIfNeeded:WriteHeader", &s);
+    TEST_SYNC_POINT("BlobFileBuilder::OpenBlobFileIfNeeded:WriteHeader");

+    const Status s = blob_log_writer->WriteHeader(header);
    if (!s.ok()) {
      return s;
    }
@@ -237,7 +215,6 @@ Status BlobFileBuilder::CompressBlobIfNeeded(
  assert(blob);
  assert(compressed_blob);
  assert(compressed_blob->empty());
-  assert(immutable_options_);

  if (blob_compression_type_ == kNoCompression) {
    return Status::OK();
@@ -252,16 +229,7 @@ Status BlobFileBuilder::CompressBlobIfNeeded(

  constexpr uint32_t compression_format_version = 2;

-  bool success = false;
-
-  {
-    StopWatch stop_watch(immutable_options_->clock, immutable_options_->stats,
-                         BLOB_DB_COMPRESSION_MICROS);
-    success =
-        CompressData(*blob, info, compression_format_version, compressed_blob);
-  }
-
-  if (!success) {
+  if (!CompressData(*blob, info, compression_format_version, compressed_blob)) {
    return Status::Corruption("Error compressing blob");
  }

@@ -279,10 +247,9 @@ Status BlobFileBuilder::WriteBlobToFile(const Slice& key, const Slice& blob,

  uint64_t key_offset = 0;

-  Status s = writer_->AddRecord(key, blob, &key_offset, blob_offset);
-
-  TEST_SYNC_POINT_CALLBACK("BlobFileBuilder::WriteBlobToFile:AddRecord", &s);
+  TEST_SYNC_POINT("BlobFileBuilder::WriteBlobToFile:AddRecord");

+  const Status s = writer_->AddRecord(key, blob, &key_offset, blob_offset);
  if (!s.ok()) {
    return s;
  }
@@ -304,30 +271,23 @@ Status BlobFileBuilder::CloseBlobFile() {
  std::string checksum_method;
  std::string checksum_value;

-  Status s = writer_->AppendFooter(footer, &checksum_method, &checksum_value);
-
-  TEST_SYNC_POINT_CALLBACK("BlobFileBuilder::WriteBlobToFile:AppendFooter", &s);
+  TEST_SYNC_POINT("BlobFileBuilder::WriteBlobToFile:AppendFooter");

+  const Status s =
+      writer_->AppendFooter(footer, &checksum_method, &checksum_value);
  if (!s.ok()) {
    return s;
  }

  const uint64_t blob_file_number = writer_->get_log_number();

-  if (blob_callback_) {
-    s = blob_callback_->OnBlobFileCompleted(
-        blob_file_paths_->back(), column_family_name_, job_id_,
-        blob_file_number, creation_reason_, s, checksum_value, checksum_method,
-        blob_count_, blob_bytes_);
-  }
-
  assert(blob_file_additions_);
  blob_file_additions_->emplace_back(blob_file_number, blob_count_, blob_bytes_,
                                     std::move(checksum_method),
                                     std::move(checksum_value));

-  assert(immutable_options_);
-  ROCKS_LOG_INFO(immutable_options_->logger,
+  assert(immutable_cf_options_);
+  ROCKS_LOG_INFO(immutable_cf_options_->info_log,
                 "[%s] [JOB %d] Generated blob file #%" PRIu64 ": %" PRIu64
                 " total blobs, %" PRIu64 " total bytes",
                 column_family_name_.c_str(), job_id_, blob_file_number,
@@ -337,7 +297,7 @@ Status BlobFileBuilder::CloseBlobFile() {
  blob_count_ = 0;
  blob_bytes_ = 0;

-  return s;
+  return Status::OK();
 }

 Status BlobFileBuilder::CloseBlobFileIfNeeded() {
@@ -353,23 +313,4 @@ Status BlobFileBuilder::CloseBlobFileIfNeeded() {
  return CloseBlobFile();
 }

-void BlobFileBuilder::Abandon(const Status& s) {
-  if (!IsBlobFileOpen()) {
-    return;
-  }
-  if (blob_callback_) {
-    // BlobFileBuilder::Abandon() is called because of error while writing to
-    // Blob files. So we can ignore the below error.
-    blob_callback_
-        ->OnBlobFileCompleted(blob_file_paths_->back(), column_family_name_,
-                              job_id_, writer_->get_log_number(),
-                              creation_reason_, s, "", "", blob_count_,
-                              blob_bytes_)
-        .PermitUncheckedError();
-  }
-
-  writer_.reset();
-  blob_count_ = 0;
-  blob_bytes_ = 0;
-}
 }  // namespace ROCKSDB_NAMESPACE
@@ -13,50 +13,41 @@
 #include "rocksdb/compression_type.h"
 #include "rocksdb/env.h"
 #include "rocksdb/rocksdb_namespace.h"
-#include "rocksdb/types.h"

 namespace ROCKSDB_NAMESPACE {

 class VersionSet;
 class FileSystem;
-class SystemClock;
-struct ImmutableOptions;
+struct ImmutableCFOptions;
 struct MutableCFOptions;
 struct FileOptions;
 class BlobFileAddition;
 class Status;
 class Slice;
 class BlobLogWriter;
-class IOTracer;
-class BlobFileCompletionCallback;

 class BlobFileBuilder {
 public:
-  BlobFileBuilder(VersionSet* versions, FileSystem* fs,
-                  const ImmutableOptions* immutable_options,
+  BlobFileBuilder(VersionSet* versions, Env* env, FileSystem* fs,
+                  const ImmutableCFOptions* immutable_cf_options,
                  const MutableCFOptions* mutable_cf_options,
                  const FileOptions* file_options, int job_id,
                  uint32_t column_family_id,
                  const std::string& column_family_name,
                  Env::IOPriority io_priority,
                  Env::WriteLifeTimeHint write_hint,
-                  const std::shared_ptr<IOTracer>& io_tracer,
-                  BlobFileCompletionCallback* blob_callback,
-                  BlobFileCreationReason creation_reason,
                  std::vector<std::string>* blob_file_paths,
                  std::vector<BlobFileAddition>* blob_file_additions);

-  BlobFileBuilder(std::function<uint64_t()> file_number_generator,
-                  FileSystem* fs, const ImmutableOptions* immutable_options,
+  BlobFileBuilder(std::function<uint64_t()> file_number_generator, Env* env,
+                  FileSystem* fs,
+                  const ImmutableCFOptions* immutable_cf_options,
                  const MutableCFOptions* mutable_cf_options,
                  const FileOptions* file_options, int job_id,
                  uint32_t column_family_id,
                  const std::string& column_family_name,
                  Env::IOPriority io_priority,
                  Env::WriteLifeTimeHint write_hint,
-                  const std::shared_ptr<IOTracer>& io_tracer,
-                  BlobFileCompletionCallback* blob_callback,
-                  BlobFileCreationReason creation_reason,
                  std::vector<std::string>* blob_file_paths,
                  std::vector<BlobFileAddition>* blob_file_additions);

@@ -67,7 +58,6 @@ class BlobFileBuilder {

  Status Add(const Slice& key, const Slice& value, std::string* blob_index);
  Status Finish();
-  void Abandon(const Status& s);

 private:
  bool IsBlobFileOpen() const;
@@ -79,8 +69,9 @@ class BlobFileBuilder {
  Status CloseBlobFileIfNeeded();

  std::function<uint64_t()> file_number_generator_;
+  Env* env_;
  FileSystem* fs_;
-  const ImmutableOptions* immutable_options_;
+  const ImmutableCFOptions* immutable_cf_options_;
  uint64_t min_blob_size_;
  uint64_t blob_file_size_;
  CompressionType blob_compression_type_;
@@ -90,9 +81,6 @@ class BlobFileBuilder {
  std::string column_family_name_;
  Env::IOPriority io_priority_;
  Env::WriteLifeTimeHint write_hint_;
-  std::shared_ptr<IOTracer> io_tracer_;
-  BlobFileCompletionCallback* blob_callback_;
-  BlobFileCreationReason creation_reason_;
  std::vector<std::string>* blob_file_paths_;
  std::vector<BlobFileAddition>* blob_file_additions_;
  std::unique_ptr<BlobLogWriter> writer_;
@@ -15,6 +15,7 @@
 #include "db/blob/blob_index.h"
 #include "db/blob/blob_log_format.h"
 #include "db/blob/blob_log_sequential_reader.h"
+#include "env/composite_env_wrapper.h"
 #include "env/mock_env.h"
 #include "file/filename.h"
 #include "file/random_access_file_reader.h"
@@ -39,11 +40,7 @@ class TestFileNumberGenerator {

 class BlobFileBuilderTest : public testing::Test {
 protected:
-  BlobFileBuilderTest() {
-    mock_env_.reset(MockEnv::Create(Env::Default()));
-    fs_ = mock_env_->GetFileSystem().get();
-    clock_ = mock_env_->GetSystemClock().get();
-  }
+  BlobFileBuilderTest() : mock_env_(Env::Default()), fs_(&mock_env_) {}

  void VerifyBlobFile(uint64_t blob_file_number,
                      const std::string& blob_file_path,
@@ -57,13 +54,14 @@ class BlobFileBuilderTest : public testing::Test {
    std::unique_ptr<FSRandomAccessFile> file;
    constexpr IODebugContext* dbg = nullptr;
    ASSERT_OK(
-        fs_->NewRandomAccessFile(blob_file_path, file_options_, &file, dbg));
+        fs_.NewRandomAccessFile(blob_file_path, file_options_, &file, dbg));

    std::unique_ptr<RandomAccessFileReader> file_reader(
-        new RandomAccessFileReader(std::move(file), blob_file_path, clock_));
+        new RandomAccessFileReader(std::move(file), blob_file_path,
+                                   &mock_env_));

    constexpr Statistics* statistics = nullptr;
-    BlobLogSequentialReader blob_log_reader(std::move(file_reader), clock_,
+    BlobLogSequentialReader blob_log_reader(std::move(file_reader), &mock_env_,
                                            statistics);

    BlobLogHeader header;
@@ -109,9 +107,8 @@ class BlobFileBuilderTest : public testing::Test {
    ASSERT_EQ(footer.expiration_range, ExpirationRange());
  }

-  std::unique_ptr<Env> mock_env_;
-  FileSystem* fs_;
-  SystemClock* clock_;
+  MockEnv mock_env_;
+  LegacyFileSystemWrapper fs_;
  FileOptions file_options_;
 };

@@ -124,13 +121,12 @@ TEST_F(BlobFileBuilderTest, BuildAndCheckOneFile) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
+      test::PerThreadDBPath(&mock_env_,
                            "BlobFileBuilderTest_BuildAndCheckOneFile"),
      0);
  options.enable_blob_files = true;
-  options.env = mock_env_.get();

-  ImmutableOptions immutable_options(options);
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -142,11 +138,11 @@ TEST_F(BlobFileBuilderTest, BuildAndCheckOneFile) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &mock_env_, &fs_,
+                          &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

  std::vector<std::pair<std::string, std::string>> expected_key_value_pairs(
      number_of_blobs);
@@ -178,9 +174,9 @@ TEST_F(BlobFileBuilderTest, BuildAndCheckOneFile) {

  const std::string& blob_file_path = blob_file_paths[0];

-  ASSERT_EQ(
-      blob_file_path,
-      BlobFileName(immutable_options.cf_paths.front().path, blob_file_number));
+  ASSERT_EQ(blob_file_path,
+            BlobFileName(immutable_cf_options.cf_paths.front().path,
+                         blob_file_number));

  ASSERT_EQ(blob_file_additions.size(), 1);

@@ -207,14 +203,13 @@ TEST_F(BlobFileBuilderTest, BuildAndCheckMultipleFiles) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
+      test::PerThreadDBPath(&mock_env_,
                            "BlobFileBuilderTest_BuildAndCheckMultipleFiles"),
      0);
  options.enable_blob_files = true;
  options.blob_file_size = value_size;
-  options.env = mock_env_.get();

-  ImmutableOptions immutable_options(options);
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -226,11 +221,11 @@ TEST_F(BlobFileBuilderTest, BuildAndCheckMultipleFiles) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &mock_env_, &fs_,
+                          &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

  std::vector<std::pair<std::string, std::string>> expected_key_value_pairs(
      number_of_blobs);
@@ -263,7 +258,7 @@ TEST_F(BlobFileBuilderTest, BuildAndCheckMultipleFiles) {
    const uint64_t blob_file_number = i + 2;

    ASSERT_EQ(blob_file_paths[i],
-              BlobFileName(immutable_options.cf_paths.front().path,
+              BlobFileName(immutable_cf_options.cf_paths.front().path,
                           blob_file_number));

    const auto& blob_file_addition = blob_file_additions[i];
@@ -294,14 +289,12 @@ TEST_F(BlobFileBuilderTest, InlinedValues) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
-                            "BlobFileBuilderTest_InlinedValues"),
+      test::PerThreadDBPath(&mock_env_, "BlobFileBuilderTest_InlinedValues"),
      0);
  options.enable_blob_files = true;
  options.min_blob_size = 1024;
-  options.env = mock_env_.get();

-  ImmutableOptions immutable_options(options);
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -313,11 +306,11 @@ TEST_F(BlobFileBuilderTest, InlinedValues) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &mock_env_, &fs_,
+                          &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

  for (size_t i = 0; i < number_of_blobs; ++i) {
    const std::string key = std::to_string(i);
@@ -349,13 +342,11 @@ TEST_F(BlobFileBuilderTest, Compression) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(), "BlobFileBuilderTest_Compression"),
-      0);
+      test::PerThreadDBPath(&mock_env_, "BlobFileBuilderTest_Compression"), 0);
  options.enable_blob_files = true;
  options.blob_compression_type = kSnappyCompression;
-  options.env = mock_env_.get();

-  ImmutableOptions immutable_options(options);
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -367,11 +358,11 @@ TEST_F(BlobFileBuilderTest, Compression) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &mock_env_, &fs_,
+                          &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

  const std::string key("1");
  const std::string uncompressed_value(value_size, 'x');
@@ -390,9 +381,9 @@ TEST_F(BlobFileBuilderTest, Compression) {

  const std::string& blob_file_path = blob_file_paths[0];

-  ASSERT_EQ(
-      blob_file_path,
-      BlobFileName(immutable_options.cf_paths.front().path, blob_file_number));
+  ASSERT_EQ(blob_file_path,
+            BlobFileName(immutable_cf_options.cf_paths.front().path,
+                         blob_file_number));

  ASSERT_EQ(blob_file_additions.size(), 1);

@@ -432,13 +423,12 @@ TEST_F(BlobFileBuilderTest, CompressionError) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
-                            "BlobFileBuilderTest_CompressionError"),
+      test::PerThreadDBPath(&mock_env_, "BlobFileBuilderTest_CompressionError"),
      0);
  options.enable_blob_files = true;
  options.blob_compression_type = kSnappyCompression;
-  options.env = mock_env_.get();
-  ImmutableOptions immutable_options(options);
+
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -450,11 +440,11 @@ TEST_F(BlobFileBuilderTest, CompressionError) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &mock_env_, &fs_,
+                          &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

  SyncPoint::GetInstance()->SetCallBack("CompressData:TamperWithReturnValue",
                                        [](void* arg) {
@@ -476,9 +466,9 @@ TEST_F(BlobFileBuilderTest, CompressionError) {
  constexpr uint64_t blob_file_number = 2;

  ASSERT_EQ(blob_file_paths.size(), 1);
-  ASSERT_EQ(
-      blob_file_paths[0],
-      BlobFileName(immutable_options.cf_paths.front().path, blob_file_number));
+  ASSERT_EQ(blob_file_paths[0],
+            BlobFileName(immutable_cf_options.cf_paths.front().path,
+                         blob_file_number));

  ASSERT_TRUE(blob_file_additions.empty());
 }
@@ -510,14 +500,12 @@ TEST_F(BlobFileBuilderTest, Checksum) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(), "BlobFileBuilderTest_Checksum"),
-      0);
+      test::PerThreadDBPath(&mock_env_, "BlobFileBuilderTest_Checksum"), 0);
  options.enable_blob_files = true;
  options.file_checksum_gen_factory =
      std::make_shared<DummyFileChecksumGenFactory>();
-  options.env = mock_env_.get();

-  ImmutableOptions immutable_options(options);
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -529,11 +517,11 @@ TEST_F(BlobFileBuilderTest, Checksum) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &mock_env_, &fs_,
+                          &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

  const std::string key("1");
  const std::string value("deadbeef");
@@ -552,9 +540,9 @@ TEST_F(BlobFileBuilderTest, Checksum) {

  const std::string& blob_file_path = blob_file_paths[0];

-  ASSERT_EQ(
-      blob_file_path,
-      BlobFileName(immutable_options.cf_paths.front().path, blob_file_number));
+  ASSERT_EQ(blob_file_path,
+            BlobFileName(immutable_cf_options.cf_paths.front().path,
+                         blob_file_number));

  ASSERT_EQ(blob_file_additions.size(), 1);

@@ -580,13 +568,15 @@ class BlobFileBuilderIOErrorTest
    : public testing::Test,
      public testing::WithParamInterface<std::string> {
 protected:
-  BlobFileBuilderIOErrorTest() : sync_point_(GetParam()) {
-    mock_env_.reset(MockEnv::Create(Env::Default()));
-    fs_ = mock_env_->GetFileSystem().get();
-  }
+  BlobFileBuilderIOErrorTest()
+      : mock_env_(Env::Default()),
+        fault_injection_env_(&mock_env_),
+        fs_(&fault_injection_env_),
+        sync_point_(GetParam()) {}

-  std::unique_ptr<Env> mock_env_;
-  FileSystem* fs_;
+  MockEnv mock_env_;
+  FaultInjectionTestEnv fault_injection_env_;
+  LegacyFileSystemWrapper fs_;
  FileOptions file_options_;
  std::string sync_point_;
 };
@@ -607,14 +597,13 @@ TEST_P(BlobFileBuilderIOErrorTest, IOError) {

  Options options;
  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
+      test::PerThreadDBPath(&fault_injection_env_,
                            "BlobFileBuilderIOErrorTest_IOError"),
      0);
  options.enable_blob_files = true;
  options.blob_file_size = value_size;
-  options.env = mock_env_.get();

-  ImmutableOptions immutable_options(options);
+  ImmutableCFOptions immutable_cf_options(options);
  MutableCFOptions mutable_cf_options(options);

  constexpr int job_id = 1;
@@ -626,17 +615,15 @@ TEST_P(BlobFileBuilderIOErrorTest, IOError) {
  std::vector<std::string> blob_file_paths;
  std::vector<BlobFileAddition> blob_file_additions;

-  BlobFileBuilder builder(
-      TestFileNumberGenerator(), fs_, &immutable_options, &mutable_cf_options,
-      &file_options_, job_id, column_family_id, column_family_name, io_priority,
-      write_hint, nullptr /*IOTracer*/, nullptr /*BlobFileCompletionCallback*/,
-      BlobFileCreationReason::kFlush, &blob_file_paths, &blob_file_additions);
+  BlobFileBuilder builder(TestFileNumberGenerator(), &fault_injection_env_,
+                          &fs_, &immutable_cf_options, &mutable_cf_options,
+                          &file_options_, job_id, column_family_id,
+                          column_family_name, io_priority, write_hint,
+                          &blob_file_paths, &blob_file_additions);

-  SyncPoint::GetInstance()->SetCallBack(sync_point_, [this](void* arg) {
-    Status* const s = static_cast<Status*>(arg);
-    assert(s);
-
-    (*s) = Status::IOError(sync_point_);
+  SyncPoint::GetInstance()->SetCallBack(sync_point_, [this](void* /* arg */) {
+    fault_injection_env_.SetFilesystemActive(false,
+                                             Status::IOError(sync_point_));
  });
  SyncPoint::GetInstance()->EnableProcessing();

@@ -657,7 +644,7 @@ TEST_P(BlobFileBuilderIOErrorTest, IOError) {

    ASSERT_EQ(blob_file_paths.size(), 1);
    ASSERT_EQ(blob_file_paths[0],
-              BlobFileName(immutable_options.cf_paths.front().path,
+              BlobFileName(immutable_cf_options.cf_paths.front().path,
                           blob_file_number));
  }

@@ -1,102 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_file_cache.h"
-
-#include <cassert>
-#include <memory>
-
-#include "db/blob/blob_file_reader.h"
-#include "options/cf_options.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/slice.h"
-#include "test_util/sync_point.h"
-#include "trace_replay/io_tracer.h"
-#include "util/hash.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-BlobFileCache::BlobFileCache(Cache* cache,
-                             const ImmutableOptions* immutable_options,
-                             const FileOptions* file_options,
-                             uint32_t column_family_id,
-                             HistogramImpl* blob_file_read_hist,
-                             const std::shared_ptr<IOTracer>& io_tracer)
-    : cache_(cache),
-      mutex_(kNumberOfMutexStripes, kGetSliceNPHash64UnseededFnPtr),
-      immutable_options_(immutable_options),
-      file_options_(file_options),
-      column_family_id_(column_family_id),
-      blob_file_read_hist_(blob_file_read_hist),
-      io_tracer_(io_tracer) {
-  assert(cache_);
-  assert(immutable_options_);
-  assert(file_options_);
-}
-
-Status BlobFileCache::GetBlobFileReader(
-    uint64_t blob_file_number,
-    CacheHandleGuard<BlobFileReader>* blob_file_reader) {
-  assert(blob_file_reader);
-  assert(blob_file_reader->IsEmpty());
-
-  const Slice key = GetSlice(&blob_file_number);
-
-  assert(cache_);
-
-  Cache::Handle* handle = cache_->Lookup(key);
-  if (handle) {
-    *blob_file_reader = CacheHandleGuard<BlobFileReader>(cache_, handle);
-    return Status::OK();
-  }
-
-  TEST_SYNC_POINT("BlobFileCache::GetBlobFileReader:DoubleCheck");
-
-  // Check again while holding mutex
-  MutexLock lock(mutex_.get(key));
-
-  handle = cache_->Lookup(key);
-  if (handle) {
-    *blob_file_reader = CacheHandleGuard<BlobFileReader>(cache_, handle);
-    return Status::OK();
-  }
-
-  assert(immutable_options_);
-  Statistics* const statistics = immutable_options_->stats;
-
-  RecordTick(statistics, NO_FILE_OPENS);
-
-  std::unique_ptr<BlobFileReader> reader;
-
-  {
-    assert(file_options_);
-    const Status s = BlobFileReader::Create(
-        *immutable_options_, *file_options_, column_family_id_,
-        blob_file_read_hist_, blob_file_number, io_tracer_, &reader);
-    if (!s.ok()) {
-      RecordTick(statistics, NO_FILE_ERRORS);
-      return s;
-    }
-  }
-
-  {
-    constexpr size_t charge = 1;
-
-    const Status s = cache_->Insert(key, reader.get(), charge,
-                                    &DeleteCacheEntry<BlobFileReader>, &handle);
-    if (!s.ok()) {
-      RecordTick(statistics, NO_FILE_ERRORS);
-      return s;
-    }
-  }
-
-  reader.release();
-
-  *blob_file_reader = CacheHandleGuard<BlobFileReader>(cache_, handle);
-
-  return Status::OK();
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,52 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <cinttypes>
-
-#include "cache/cache_helpers.h"
-#include "rocksdb/rocksdb_namespace.h"
-#include "util/mutexlock.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-class Cache;
-struct ImmutableOptions;
-struct FileOptions;
-class HistogramImpl;
-class Status;
-class BlobFileReader;
-class Slice;
-class IOTracer;
-
-class BlobFileCache {
- public:
-  BlobFileCache(Cache* cache, const ImmutableOptions* immutable_options,
-                const FileOptions* file_options, uint32_t column_family_id,
-                HistogramImpl* blob_file_read_hist,
-                const std::shared_ptr<IOTracer>& io_tracer);
-
-  BlobFileCache(const BlobFileCache&) = delete;
-  BlobFileCache& operator=(const BlobFileCache&) = delete;
-
-  Status GetBlobFileReader(uint64_t blob_file_number,
-                           CacheHandleGuard<BlobFileReader>* blob_file_reader);
-
- private:
-  Cache* cache_;
-  // Note: mutex_ below is used to guard against multiple threads racing to open
-  // the same file.
-  Striped<port::Mutex, Slice> mutex_;
-  const ImmutableOptions* immutable_options_;
-  const FileOptions* file_options_;
-  uint32_t column_family_id_;
-  HistogramImpl* blob_file_read_hist_;
-  std::shared_ptr<IOTracer> io_tracer_;
-
-  static constexpr size_t kNumberOfMutexStripes = 1 << 7;
-};
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,268 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_file_cache.h"
-
-#include <cassert>
-#include <string>
-
-#include "db/blob/blob_log_format.h"
-#include "db/blob/blob_log_writer.h"
-#include "env/mock_env.h"
-#include "file/filename.h"
-#include "file/read_write_util.h"
-#include "file/writable_file_writer.h"
-#include "options/cf_options.h"
-#include "rocksdb/cache.h"
-#include "rocksdb/env.h"
-#include "rocksdb/file_system.h"
-#include "rocksdb/options.h"
-#include "rocksdb/statistics.h"
-#include "test_util/sync_point.h"
-#include "test_util/testharness.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-namespace {
-
-// Creates a test blob file with a single blob in it.
-void WriteBlobFile(uint32_t column_family_id,
-                   const ImmutableOptions& immutable_options,
-                   uint64_t blob_file_number) {
-  assert(!immutable_options.cf_paths.empty());
-
-  const std::string blob_file_path =
-      BlobFileName(immutable_options.cf_paths.front().path, blob_file_number);
-
-  std::unique_ptr<FSWritableFile> file;
-  ASSERT_OK(NewWritableFile(immutable_options.fs.get(), blob_file_path, &file,
-                            FileOptions()));
-
-  std::unique_ptr<WritableFileWriter> file_writer(new WritableFileWriter(
-      std::move(file), blob_file_path, FileOptions(), immutable_options.clock));
-
-  constexpr Statistics* statistics = nullptr;
-  constexpr bool use_fsync = false;
-  constexpr bool do_flush = false;
-
-  BlobLogWriter blob_log_writer(std::move(file_writer), immutable_options.clock,
-                                statistics, blob_file_number, use_fsync,
-                                do_flush);
-
-  constexpr bool has_ttl = false;
-  constexpr ExpirationRange expiration_range;
-
-  BlobLogHeader header(column_family_id, kNoCompression, has_ttl,
-                       expiration_range);
-
-  ASSERT_OK(blob_log_writer.WriteHeader(header));
-
-  constexpr char key[] = "key";
-  constexpr char blob[] = "blob";
-
-  std::string compressed_blob;
-
-  uint64_t key_offset = 0;
-  uint64_t blob_offset = 0;
-
-  ASSERT_OK(blob_log_writer.AddRecord(key, blob, &key_offset, &blob_offset));
-
-  BlobLogFooter footer;
-  footer.blob_count = 1;
-  footer.expiration_range = expiration_range;
-
-  std::string checksum_method;
-  std::string checksum_value;
-
-  ASSERT_OK(
-      blob_log_writer.AppendFooter(footer, &checksum_method, &checksum_value));
-}
-
-}  // anonymous namespace
-
-class BlobFileCacheTest : public testing::Test {
- protected:
-  BlobFileCacheTest() { mock_env_.reset(MockEnv::Create(Env::Default())); }
-
-  std::unique_ptr<Env> mock_env_;
-};
-
-TEST_F(BlobFileCacheTest, GetBlobFileReader) {
-  Options options;
-  options.env = mock_env_.get();
-  options.statistics = CreateDBStatistics();
-  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
-                            "BlobFileCacheTest_GetBlobFileReader"),
-      0);
-  options.enable_blob_files = true;
-
-  constexpr uint32_t column_family_id = 1;
-  ImmutableOptions immutable_options(options);
-  constexpr uint64_t blob_file_number = 123;
-
-  WriteBlobFile(column_family_id, immutable_options, blob_file_number);
-
-  constexpr size_t capacity = 10;
-  std::shared_ptr<Cache> backing_cache = NewLRUCache(capacity);
-
-  FileOptions file_options;
-  constexpr HistogramImpl* blob_file_read_hist = nullptr;
-
-  BlobFileCache blob_file_cache(backing_cache.get(), &immutable_options,
-                                &file_options, column_family_id,
-                                blob_file_read_hist, nullptr /*IOTracer*/);
-
-  // First try: reader should be opened and put in cache
-  CacheHandleGuard<BlobFileReader> first;
-
-  ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &first));
-  ASSERT_NE(first.GetValue(), nullptr);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
-
-  // Second try: reader should be served from cache
-  CacheHandleGuard<BlobFileReader> second;
-
-  ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &second));
-  ASSERT_NE(second.GetValue(), nullptr);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
-
-  ASSERT_EQ(first.GetValue(), second.GetValue());
-}
-
-TEST_F(BlobFileCacheTest, GetBlobFileReader_Race) {
-  Options options;
-  options.env = mock_env_.get();
-  options.statistics = CreateDBStatistics();
-  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
-                            "BlobFileCacheTest_GetBlobFileReader_Race"),
-      0);
-  options.enable_blob_files = true;
-
-  constexpr uint32_t column_family_id = 1;
-  ImmutableOptions immutable_options(options);
-  constexpr uint64_t blob_file_number = 123;
-
-  WriteBlobFile(column_family_id, immutable_options, blob_file_number);
-
-  constexpr size_t capacity = 10;
-  std::shared_ptr<Cache> backing_cache = NewLRUCache(capacity);
-
-  FileOptions file_options;
-  constexpr HistogramImpl* blob_file_read_hist = nullptr;
-
-  BlobFileCache blob_file_cache(backing_cache.get(), &immutable_options,
-                                &file_options, column_family_id,
-                                blob_file_read_hist, nullptr /*IOTracer*/);
-
-  CacheHandleGuard<BlobFileReader> first;
-  CacheHandleGuard<BlobFileReader> second;
-
-  SyncPoint::GetInstance()->SetCallBack(
-      "BlobFileCache::GetBlobFileReader:DoubleCheck", [&](void* /* arg */) {
-        // Disabling sync points to prevent infinite recursion
-        SyncPoint::GetInstance()->DisableProcessing();
-
-        ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &second));
-        ASSERT_NE(second.GetValue(), nullptr);
-        ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
-        ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
-      });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  ASSERT_OK(blob_file_cache.GetBlobFileReader(blob_file_number, &first));
-  ASSERT_NE(first.GetValue(), nullptr);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 0);
-
-  ASSERT_EQ(first.GetValue(), second.GetValue());
-
-  SyncPoint::GetInstance()->DisableProcessing();
-  SyncPoint::GetInstance()->ClearAllCallBacks();
-}
-
-TEST_F(BlobFileCacheTest, GetBlobFileReader_IOError) {
-  Options options;
-  options.env = mock_env_.get();
-  options.statistics = CreateDBStatistics();
-  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
-                            "BlobFileCacheTest_GetBlobFileReader_IOError"),
-      0);
-  options.enable_blob_files = true;
-
-  constexpr size_t capacity = 10;
-  std::shared_ptr<Cache> backing_cache = NewLRUCache(capacity);
-
-  ImmutableOptions immutable_options(options);
-  FileOptions file_options;
-  constexpr uint32_t column_family_id = 1;
-  constexpr HistogramImpl* blob_file_read_hist = nullptr;
-
-  BlobFileCache blob_file_cache(backing_cache.get(), &immutable_options,
-                                &file_options, column_family_id,
-                                blob_file_read_hist, nullptr /*IOTracer*/);
-
-  // Note: there is no blob file with the below number
-  constexpr uint64_t blob_file_number = 123;
-
-  CacheHandleGuard<BlobFileReader> reader;
-
-  ASSERT_TRUE(
-      blob_file_cache.GetBlobFileReader(blob_file_number, &reader).IsIOError());
-  ASSERT_EQ(reader.GetValue(), nullptr);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 1);
-}
-
-TEST_F(BlobFileCacheTest, GetBlobFileReader_CacheFull) {
-  Options options;
-  options.env = mock_env_.get();
-  options.statistics = CreateDBStatistics();
-  options.cf_paths.emplace_back(
-      test::PerThreadDBPath(mock_env_.get(),
-                            "BlobFileCacheTest_GetBlobFileReader_CacheFull"),
-      0);
-  options.enable_blob_files = true;
-
-  constexpr uint32_t column_family_id = 1;
-  ImmutableOptions immutable_options(options);
-  constexpr uint64_t blob_file_number = 123;
-
-  WriteBlobFile(column_family_id, immutable_options, blob_file_number);
-
-  constexpr size_t capacity = 0;
-  constexpr int num_shard_bits = -1;  // determined automatically
-  constexpr bool strict_capacity_limit = true;
-  std::shared_ptr<Cache> backing_cache =
-      NewLRUCache(capacity, num_shard_bits, strict_capacity_limit);
-
-  FileOptions file_options;
-  constexpr HistogramImpl* blob_file_read_hist = nullptr;
-
-  BlobFileCache blob_file_cache(backing_cache.get(), &immutable_options,
-                                &file_options, column_family_id,
-                                blob_file_read_hist, nullptr /*IOTracer*/);
-
-  // Insert into cache should fail since it has zero capacity and
-  // strict_capacity_limit is set
-  CacheHandleGuard<BlobFileReader> reader;
-
-  ASSERT_TRUE(blob_file_cache.GetBlobFileReader(blob_file_number, &reader)
-                  .IsIncomplete());
-  ASSERT_EQ(reader.GetValue(), nullptr);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_OPENS), 1);
-  ASSERT_EQ(options.statistics->getTickerCount(NO_FILE_ERRORS), 1);
-}
-
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -1,101 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-//
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-#pragma once
-
-#include "db/error_handler.h"
-#include "db/event_helpers.h"
-#include "file/sst_file_manager_impl.h"
-#include "rocksdb/status.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-class BlobFileCompletionCallback {
- public:
-  BlobFileCompletionCallback(
-      SstFileManager* sst_file_manager, InstrumentedMutex* mutex,
-      ErrorHandler* error_handler, EventLogger* event_logger,
-      const std::vector<std::shared_ptr<EventListener>>& listeners,
-      const std::string& dbname)
-      : event_logger_(event_logger), listeners_(listeners), dbname_(dbname) {
-#ifndef ROCKSDB_LITE
-    sst_file_manager_ = sst_file_manager;
-    mutex_ = mutex;
-    error_handler_ = error_handler;
-#else
-    (void)sst_file_manager;
-    (void)mutex;
-    (void)error_handler;
-#endif  // ROCKSDB_LITE
-  }
-
-  void OnBlobFileCreationStarted(const std::string& file_name,
-                                 const std::string& column_family_name,
-                                 int job_id,
-                                 BlobFileCreationReason creation_reason) {
-#ifndef ROCKSDB_LITE
-    // Notify the listeners.
-    EventHelpers::NotifyBlobFileCreationStarted(listeners_, dbname_,
-                                                column_family_name, file_name,
-                                                job_id, creation_reason);
-#else
-    (void)file_name;
-    (void)column_family_name;
-    (void)job_id;
-    (void)creation_reason;
-#endif
-  }
-
-  Status OnBlobFileCompleted(const std::string& file_name,
-                             const std::string& column_family_name, int job_id,
-                             uint64_t file_number,
-                             BlobFileCreationReason creation_reason,
-                             const Status& report_status,
-                             const std::string& checksum_value,
-                             const std::string& checksum_method,
-                             uint64_t blob_count, uint64_t blob_bytes) {
-    Status s;
-
-#ifndef ROCKSDB_LITE
-    auto sfm = static_cast<SstFileManagerImpl*>(sst_file_manager_);
-    if (sfm) {
-      // Report new blob files to SstFileManagerImpl
-      s = sfm->OnAddFile(file_name);
-      if (sfm->IsMaxAllowedSpaceReached()) {
-        s = Status::SpaceLimit("Max allowed space was reached");
-        TEST_SYNC_POINT(
-            "BlobFileCompletionCallback::CallBack::MaxAllowedSpaceReached");
-        InstrumentedMutexLock l(mutex_);
-        error_handler_->SetBGError(s, BackgroundErrorReason::kFlush);
-      }
-    }
-#endif  // !ROCKSDB_LITE
-
-    // Notify the listeners.
-    EventHelpers::LogAndNotifyBlobFileCreationFinished(
-        event_logger_, listeners_, dbname_, column_family_name, file_name,
-        job_id, file_number, creation_reason,
-        (!report_status.ok() ? report_status : s),
-        (checksum_value.empty() ? kUnknownFileChecksum : checksum_value),
-        (checksum_method.empty() ? kUnknownFileChecksumFuncName
-                                 : checksum_method),
-        blob_count, blob_bytes);
-    return s;
-  }
-
- private:
-#ifndef ROCKSDB_LITE
-  SstFileManager* sst_file_manager_;
-  InstrumentedMutex* mutex_;
-  ErrorHandler* error_handler_;
-#endif  // ROCKSDB_LITE
-  EventLogger* event_logger_;
-  std::vector<std::shared_ptr<EventListener>> listeners_;
-  std::string dbname_;
-};
-}  // namespace ROCKSDB_NAMESPACE
@@ -8,13 +8,7 @@
 #include <ostream>
 #include <sstream>

-#include "db/blob/blob_log_format.h"
-#include "rocksdb/slice.h"
-
 namespace ROCKSDB_NAMESPACE {
-uint64_t SharedBlobFileMetaData::GetBlobFileSize() const {
-  return BlobLogHeader::kSize + total_blob_bytes_ + BlobLogFooter::kSize;
-}

 std::string SharedBlobFileMetaData::DebugString() const {
  std::ostringstream oss;
@@ -29,8 +23,7 @@ std::ostream& operator<<(std::ostream& os,
     << " total_blob_count: " << shared_meta.GetTotalBlobCount()
     << " total_blob_bytes: " << shared_meta.GetTotalBlobBytes()
     << " checksum_method: " << shared_meta.GetChecksumMethod()
-     << " checksum_value: "
-     << Slice(shared_meta.GetChecksumValue()).ToString(/* hex */ true);
+     << " checksum_value: " << shared_meta.GetChecksumValue();

  return os;
 }
@@ -51,7 +51,6 @@ class SharedBlobFileMetaData {
  SharedBlobFileMetaData(SharedBlobFileMetaData&&) = delete;
  SharedBlobFileMetaData& operator=(SharedBlobFileMetaData&&) = delete;

-  uint64_t GetBlobFileSize() const;
  uint64_t GetBlobFileNumber() const { return blob_file_number_; }
  uint64_t GetTotalBlobCount() const { return total_blob_count_; }
  uint64_t GetTotalBlobBytes() const { return total_blob_bytes_; }
@@ -113,11 +112,6 @@ class BlobFileMetaData {
    return shared_meta_;
  }

-  uint64_t GetBlobFileSize() const {
-    assert(shared_meta_);
-    return shared_meta_->GetBlobFileSize();
-  }
-
  uint64_t GetBlobFileNumber() const {
    assert(shared_meta_);
    return shared_meta_->GetBlobFileNumber();
@@ -9,9 +9,7 @@
 #include <string>

 #include "db/blob/blob_log_format.h"
-#include "file/file_prefetch_buffer.h"
 #include "file/filename.h"
-#include "monitoring/statistics.h"
 #include "options/cf_options.h"
 #include "rocksdb/file_system.h"
 #include "rocksdb/slice.h"
@@ -19,14 +17,13 @@
 #include "test_util/sync_point.h"
 #include "util/compression.h"
 #include "util/crc32c.h"
-#include "util/stop_watch.h"

 namespace ROCKSDB_NAMESPACE {

 Status BlobFileReader::Create(
-    const ImmutableOptions& immutable_options, const FileOptions& file_options,
-    uint32_t column_family_id, HistogramImpl* blob_file_read_hist,
-    uint64_t blob_file_number, const std::shared_ptr<IOTracer>& io_tracer,
+    const ImmutableCFOptions& immutable_cf_options,
+    const FileOptions& file_options, uint32_t column_family_id,
+    HistogramImpl* blob_file_read_hist, uint64_t blob_file_number,
    std::unique_ptr<BlobFileReader>* blob_file_reader) {
  assert(blob_file_reader);
  assert(!*blob_file_reader);
@@ -36,8 +33,8 @@ Status BlobFileReader::Create(

  {
    const Status s =
-        OpenFile(immutable_options, file_options, blob_file_read_hist,
-                 blob_file_number, io_tracer, &file_size, &file_reader);
+        OpenFile(immutable_cf_options, file_options, blob_file_read_hist,
+                 blob_file_number, &file_size, &file_reader);
    if (!s.ok()) {
      return s;
    }
@@ -45,47 +42,44 @@ Status BlobFileReader::Create(

  assert(file_reader);

-  Statistics* const statistics = immutable_options.stats;
-
  CompressionType compression_type = kNoCompression;

  {
-    const Status s = ReadHeader(file_reader.get(), column_family_id, statistics,
-                                &compression_type);
+    const Status s =
+        ReadHeader(file_reader.get(), column_family_id, &compression_type);
    if (!s.ok()) {
      return s;
    }
  }

  {
-    const Status s = ReadFooter(file_reader.get(), file_size, statistics);
+    const Status s = ReadFooter(file_size, file_reader.get());
    if (!s.ok()) {
      return s;
    }
  }

  blob_file_reader->reset(
-      new BlobFileReader(std::move(file_reader), file_size, compression_type,
-                         immutable_options.clock, statistics));
+      new BlobFileReader(std::move(file_reader), file_size, compression_type));

  return Status::OK();
 }

 Status BlobFileReader::OpenFile(
-    const ImmutableOptions& immutable_options, const FileOptions& file_opts,
-    HistogramImpl* blob_file_read_hist, uint64_t blob_file_number,
-    const std::shared_ptr<IOTracer>& io_tracer, uint64_t* file_size,
+    const ImmutableCFOptions& immutable_cf_options,
+    const FileOptions& file_opts, HistogramImpl* blob_file_read_hist,
+    uint64_t blob_file_number, uint64_t* file_size,
    std::unique_ptr<RandomAccessFileReader>* file_reader) {
  assert(file_size);
  assert(file_reader);

-  const auto& cf_paths = immutable_options.cf_paths;
+  const auto& cf_paths = immutable_cf_options.cf_paths;
  assert(!cf_paths.empty());

  const std::string blob_file_path =
      BlobFileName(cf_paths.front().path, blob_file_number);

-  FileSystem* const fs = immutable_options.fs.get();
+  FileSystem* const fs = immutable_cf_options.fs;
  assert(fs);

  constexpr IODebugContext* dbg = nullptr;
@@ -118,22 +112,21 @@ Status BlobFileReader::OpenFile(

  assert(file);

-  if (immutable_options.advise_random_on_open) {
+  if (immutable_cf_options.advise_random_on_open) {
    file->Hint(FSRandomAccessFile::kRandom);
  }

  file_reader->reset(new RandomAccessFileReader(
-      std::move(file), blob_file_path, immutable_options.clock, io_tracer,
-      immutable_options.stats, BLOB_DB_BLOB_FILE_READ_MICROS,
-      blob_file_read_hist, immutable_options.rate_limiter.get(),
-      immutable_options.listeners));
+      std::move(file), blob_file_path, immutable_cf_options.env,
+      std::shared_ptr<IOTracer>(), immutable_cf_options.statistics,
+      BLOB_DB_BLOB_FILE_READ_MICROS, blob_file_read_hist,
+      immutable_cf_options.rate_limiter, immutable_cf_options.listeners));

  return Status::OK();
 }

 Status BlobFileReader::ReadHeader(const RandomAccessFileReader* file_reader,
                                  uint32_t column_family_id,
-                                  Statistics* statistics,
                                  CompressionType* compression_type) {
  assert(file_reader);
  assert(compression_type);
@@ -148,9 +141,8 @@ Status BlobFileReader::ReadHeader(const RandomAccessFileReader* file_reader,
    constexpr uint64_t read_offset = 0;
    constexpr size_t read_size = BlobLogHeader::kSize;

-    const Status s =
-        ReadFromFile(file_reader, read_offset, read_size, statistics,
-                     &header_slice, &buf, &aligned_buf);
+    const Status s = ReadFromFile(file_reader, read_offset, read_size,
+                                  &header_slice, &buf, &aligned_buf);
    if (!s.ok()) {
      return s;
    }
@@ -183,8 +175,8 @@ Status BlobFileReader::ReadHeader(const RandomAccessFileReader* file_reader,
  return Status::OK();
 }

-Status BlobFileReader::ReadFooter(const RandomAccessFileReader* file_reader,
-                                  uint64_t file_size, Statistics* statistics) {
+Status BlobFileReader::ReadFooter(uint64_t file_size,
+                                  const RandomAccessFileReader* file_reader) {
  assert(file_size >= BlobLogHeader::kSize + BlobLogFooter::kSize);
  assert(file_reader);

@@ -198,9 +190,8 @@ Status BlobFileReader::ReadFooter(const RandomAccessFileReader* file_reader,
    const uint64_t read_offset = file_size - BlobLogFooter::kSize;
    constexpr size_t read_size = BlobLogFooter::kSize;

-    const Status s =
-        ReadFromFile(file_reader, read_offset, read_size, statistics,
-                     &footer_slice, &buf, &aligned_buf);
+    const Status s = ReadFromFile(file_reader, read_offset, read_size,
+                                  &footer_slice, &buf, &aligned_buf);
    if (!s.ok()) {
      return s;
    }
@@ -229,16 +220,14 @@ Status BlobFileReader::ReadFooter(const RandomAccessFileReader* file_reader,

 Status BlobFileReader::ReadFromFile(const RandomAccessFileReader* file_reader,
                                    uint64_t read_offset, size_t read_size,
-                                    Statistics* statistics, Slice* slice,
-                                    Buffer* buf, AlignedBuf* aligned_buf) {
+                                    Slice* slice, Buffer* buf,
+                                    AlignedBuf* aligned_buf) {
  assert(slice);
  assert(buf);
  assert(aligned_buf);

  assert(file_reader);

-  RecordTick(statistics, BLOB_DB_BLOB_FILE_BYTES_READ, read_size);
-
  Status s;

  if (file_reader->use_direct_io()) {
@@ -267,13 +256,10 @@ Status BlobFileReader::ReadFromFile(const RandomAccessFileReader* file_reader,

 BlobFileReader::BlobFileReader(
    std::unique_ptr<RandomAccessFileReader>&& file_reader, uint64_t file_size,
-    CompressionType compression_type, SystemClock* clock,
-    Statistics* statistics)
+    CompressionType compression_type)
    : file_reader_(std::move(file_reader)),
      file_size_(file_size),
-      compression_type_(compression_type),
-      clock_(clock),
-      statistics_(statistics) {
+      compression_type_(compression_type) {
  assert(file_reader_);
 }

@@ -283,9 +269,7 @@ Status BlobFileReader::GetBlob(const ReadOptions& read_options,
                               const Slice& user_key, uint64_t offset,
                               uint64_t value_size,
                               CompressionType compression_type,
-                               FilePrefetchBuffer* prefetch_buffer,
-                               PinnableSlice* value,
-                               uint64_t* bytes_read) const {
+                               PinnableSlice* value) const {
  assert(value);

  const uint64_t key_size = user_key.size();
@@ -308,40 +292,26 @@ Status BlobFileReader::GetBlob(const ReadOptions& read_options,
          : 0;
  assert(offset >= adjustment);

-  const uint64_t record_offset = offset - adjustment;
-  const uint64_t record_size = value_size + adjustment;
-
  Slice record_slice;
  Buffer buf;
  AlignedBuf aligned_buf;

-  bool prefetched = false;
-
-  if (prefetch_buffer) {
-    Status s;
-    constexpr bool for_compaction = true;
-
-    prefetched = prefetch_buffer->TryReadFromCache(
-        IOOptions(), file_reader_.get(), record_offset,
-        static_cast<size_t>(record_size), &record_slice, &s, for_compaction);
-    if (!s.ok()) {
-      return s;
-    }
-  }
-
-  if (!prefetched) {
+  {
    TEST_SYNC_POINT("BlobFileReader::GetBlob:ReadFromFile");

+    const uint64_t record_offset = offset - adjustment;
+    const uint64_t record_size = value_size + adjustment;
+
    const Status s = ReadFromFile(file_reader_.get(), record_offset,
-                                  static_cast<size_t>(record_size), statistics_,
+                                  static_cast<size_t>(record_size),
                                  &record_slice, &buf, &aligned_buf);
    if (!s.ok()) {
      return s;
    }
-  }

-  TEST_SYNC_POINT_CALLBACK("BlobFileReader::GetBlob:TamperWithResult",
-                           &record_slice);
+    TEST_SYNC_POINT_CALLBACK("BlobFileReader::GetBlob:TamperWithResult",
+                             &record_slice);
+  }

  if (read_options.verify_checksums) {
    const Status s = VerifyBlob(record_slice, user_key, value_size);
@@ -353,138 +323,16 @@ Status BlobFileReader::GetBlob(const ReadOptions& read_options,
  const Slice value_slice(record_slice.data() + adjustment, value_size);

  {
-    const Status s = UncompressBlobIfNeeded(value_slice, compression_type,
-                                            clock_, statistics_, value);
+    const Status s =
+        UncompressBlobIfNeeded(value_slice, compression_type, value);
    if (!s.ok()) {
      return s;
    }
  }

-  if (bytes_read) {
-    *bytes_read = record_size;
-  }
-
  return Status::OK();
 }

-void BlobFileReader::MultiGetBlob(
-    const ReadOptions& read_options,
-    const autovector<std::reference_wrapper<const Slice>>& user_keys,
-    const autovector<uint64_t>& offsets,
-    const autovector<uint64_t>& value_sizes, autovector<Status*>& statuses,
-    autovector<PinnableSlice*>& values, uint64_t* bytes_read) const {
-  const size_t num_blobs = user_keys.size();
-  assert(num_blobs > 0);
-  assert(num_blobs == offsets.size());
-  assert(num_blobs == value_sizes.size());
-  assert(num_blobs == statuses.size());
-  assert(num_blobs == values.size());
-
-#ifndef NDEBUG
-  for (size_t i = 0; i < offsets.size() - 1; ++i) {
-    assert(offsets[i] <= offsets[i + 1]);
-  }
-#endif  // !NDEBUG
-
-  std::vector<FSReadRequest> read_reqs(num_blobs);
-  autovector<uint64_t> adjustments;
-  uint64_t total_len = 0;
-  for (size_t i = 0; i < num_blobs; ++i) {
-    const size_t key_size = user_keys[i].get().size();
-    assert(IsValidBlobOffset(offsets[i], key_size, value_sizes[i], file_size_));
-    const uint64_t adjustment =
-        read_options.verify_checksums
-            ? BlobLogRecord::CalculateAdjustmentForRecordHeader(key_size)
-            : 0;
-    assert(offsets[i] >= adjustment);
-    adjustments.push_back(adjustment);
-    read_reqs[i].offset = offsets[i] - adjustment;
-    read_reqs[i].len = value_sizes[i] + adjustment;
-    total_len += read_reqs[i].len;
-  }
-
-  RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_READ, total_len);
-
-  Buffer buf;
-  AlignedBuf aligned_buf;
-
-  Status s;
-  bool direct_io = file_reader_->use_direct_io();
-  if (direct_io) {
-    for (size_t i = 0; i < read_reqs.size(); ++i) {
-      read_reqs[i].scratch = nullptr;
-    }
-  } else {
-    buf.reset(new char[total_len]);
-    std::ptrdiff_t pos = 0;
-    for (size_t i = 0; i < read_reqs.size(); ++i) {
-      read_reqs[i].scratch = buf.get() + pos;
-      pos += read_reqs[i].len;
-    }
-  }
-  TEST_SYNC_POINT("BlobFileReader::MultiGetBlob:ReadFromFile");
-  s = file_reader_->MultiRead(IOOptions(), read_reqs.data(), read_reqs.size(),
-                              direct_io ? &aligned_buf : nullptr);
-  if (!s.ok()) {
-    for (auto& req : read_reqs) {
-      req.status.PermitUncheckedError();
-    }
-    for (size_t i = 0; i < num_blobs; ++i) {
-      assert(statuses[i]);
-      *statuses[i] = s;
-    }
-    return;
-  }
-
-  assert(s.ok());
-  for (size_t i = 0; i < num_blobs; ++i) {
-    auto& req = read_reqs[i];
-    assert(statuses[i]);
-    if (req.status.ok() && req.result.size() != req.len) {
-      req.status = IOStatus::Corruption("Failed to read data from blob file");
-    }
-    *statuses[i] = req.status;
-  }
-
-  if (read_options.verify_checksums) {
-    for (size_t i = 0; i < num_blobs; ++i) {
-      assert(statuses[i]);
-      if (!statuses[i]->ok()) {
-        continue;
-      }
-      const Slice& record_slice = read_reqs[i].result;
-      s = VerifyBlob(record_slice, user_keys[i], value_sizes[i]);
-      if (!s.ok()) {
-        assert(statuses[i]);
-        *statuses[i] = s;
-      }
-    }
-  }
-
-  for (size_t i = 0; i < num_blobs; ++i) {
-    assert(statuses[i]);
-    if (!statuses[i]->ok()) {
-      continue;
-    }
-    const Slice& record_slice = read_reqs[i].result;
-    const Slice value_slice(record_slice.data() + adjustments[i],
-                            value_sizes[i]);
-    s = UncompressBlobIfNeeded(value_slice, compression_type_, clock_,
-                               statistics_, values[i]);
-    if (!s.ok()) {
-      *statuses[i] = s;
-    }
-  }
-
-  if (bytes_read) {
-    uint64_t total_bytes = 0;
-    for (const auto& req : read_reqs) {
-      total_bytes += req.result.size();
-    }
-    *bytes_read = total_bytes;
-  }
-}
-
 Status BlobFileReader::VerifyBlob(const Slice& record_slice,
                                  const Slice& user_key, uint64_t value_size) {
  BlobLogRecord record;
@@ -529,8 +377,6 @@ Status BlobFileReader::VerifyBlob(const Slice& record_slice,

 Status BlobFileReader::UncompressBlobIfNeeded(const Slice& value_slice,
                                              CompressionType compression_type,
-                                              SystemClock* clock,
-                                              Statistics* statistics,
                                              PinnableSlice* value) {
  assert(value);

@@ -548,14 +394,9 @@ Status BlobFileReader::UncompressBlobIfNeeded(const Slice& value_slice,
  constexpr uint32_t compression_format_version = 2;
  constexpr MemoryAllocator* allocator = nullptr;

-  CacheAllocationPtr output;
-
-  {
-    StopWatch stop_watch(clock, statistics, BLOB_DB_DECOMPRESSION_MICROS);
-    output = UncompressData(info, value_slice.data(), value_slice.size(),
-                            &uncompressed_size, compression_format_version,
-                            allocator);
-  }
+  CacheAllocationPtr output =
+      UncompressData(info, value_slice.data(), value_slice.size(),
+                     &uncompressed_size, compression_format_version, allocator);

  TEST_SYNC_POINT_CALLBACK(
      "BlobFileReader::UncompressBlobIfNeeded:TamperWithResult", &output);
@@ -11,28 +11,24 @@
 #include "file/random_access_file_reader.h"
 #include "rocksdb/compression_type.h"
 #include "rocksdb/rocksdb_namespace.h"
-#include "util/autovector.h"

 namespace ROCKSDB_NAMESPACE {

 class Status;
-struct ImmutableOptions;
+struct ImmutableCFOptions;
 struct FileOptions;
 class HistogramImpl;
 struct ReadOptions;
 class Slice;
-class FilePrefetchBuffer;
 class PinnableSlice;
-class Statistics;

 class BlobFileReader {
 public:
-  static Status Create(const ImmutableOptions& immutable_options,
+  static Status Create(const ImmutableCFOptions& immutable_cf_options,
                       const FileOptions& file_options,
                       uint32_t column_family_id,
                       HistogramImpl* blob_file_read_hist,
                       uint64_t blob_file_number,
-                       const std::shared_ptr<IOTracer>& io_tracer,
                       std::unique_ptr<BlobFileReader>* reader);

  BlobFileReader(const BlobFileReader&) = delete;
@@ -42,47 +38,30 @@ class BlobFileReader {

  Status GetBlob(const ReadOptions& read_options, const Slice& user_key,
                 uint64_t offset, uint64_t value_size,
-                 CompressionType compression_type,
-                 FilePrefetchBuffer* prefetch_buffer, PinnableSlice* value,
-                 uint64_t* bytes_read) const;
-
-  // offsets must be sorted in ascending order by caller.
-  void MultiGetBlob(
-      const ReadOptions& read_options,
-      const autovector<std::reference_wrapper<const Slice>>& user_keys,
-      const autovector<uint64_t>& offsets,
-      const autovector<uint64_t>& value_sizes, autovector<Status*>& statuses,
-      autovector<PinnableSlice*>& values, uint64_t* bytes_read) const;
-
-  CompressionType GetCompressionType() const { return compression_type_; }
-
-  uint64_t GetFileSize() const { return file_size_; }
+                 CompressionType compression_type, PinnableSlice* value) const;

 private:
  BlobFileReader(std::unique_ptr<RandomAccessFileReader>&& file_reader,
-                 uint64_t file_size, CompressionType compression_type,
-                 SystemClock* clock, Statistics* statistics);
+                 uint64_t file_size, CompressionType compression_type);

-  static Status OpenFile(const ImmutableOptions& immutable_options,
+  static Status OpenFile(const ImmutableCFOptions& immutable_cf_options,
                         const FileOptions& file_opts,
                         HistogramImpl* blob_file_read_hist,
-                         uint64_t blob_file_number,
-                         const std::shared_ptr<IOTracer>& io_tracer,
-                         uint64_t* file_size,
+                         uint64_t blob_file_number, uint64_t* file_size,
                         std::unique_ptr<RandomAccessFileReader>* file_reader);

  static Status ReadHeader(const RandomAccessFileReader* file_reader,
-                           uint32_t column_family_id, Statistics* statistics,
+                           uint32_t column_family_id,
                           CompressionType* compression_type);

-  static Status ReadFooter(const RandomAccessFileReader* file_reader,
-                           uint64_t file_size, Statistics* statistics);
+  static Status ReadFooter(uint64_t file_size,
+                           const RandomAccessFileReader* file_reader);

  using Buffer = std::unique_ptr<char[]>;

  static Status ReadFromFile(const RandomAccessFileReader* file_reader,
                             uint64_t read_offset, size_t read_size,
-                             Statistics* statistics, Slice* slice, Buffer* buf,
+                             Slice* slice, Buffer* buf,
                             AlignedBuf* aligned_buf);

  static Status VerifyBlob(const Slice& record_slice, const Slice& user_key,
@@ -90,8 +69,6 @@ class BlobFileReader {

  static Status UncompressBlobIfNeeded(const Slice& value_slice,
                                       CompressionType compression_type,
-                                       SystemClock* clock,
-                                       Statistics* statistics,
                                       PinnableSlice* value);

  static void SaveValue(const Slice& src, PinnableSlice* dst);
@@ -99,8 +76,6 @@ class BlobFileReader {
  std::unique_ptr<RandomAccessFileReader> file_reader_;
  uint64_t file_size_;
  CompressionType compression_type_;
-  SystemClock* clock_;
-  Statistics* statistics_;
 };

 }  // namespace ROCKSDB_NAMESPACE
@@ -1,100 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_garbage_meter.h"
-
-#include "db/blob/blob_index.h"
-#include "db/blob/blob_log_format.h"
-#include "db/dbformat.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-Status BlobGarbageMeter::ProcessInFlow(const Slice& key, const Slice& value) {
-  uint64_t blob_file_number = kInvalidBlobFileNumber;
-  uint64_t bytes = 0;
-
-  const Status s = Parse(key, value, &blob_file_number, &bytes);
-  if (!s.ok()) {
-    return s;
-  }
-
-  if (blob_file_number == kInvalidBlobFileNumber) {
-    return Status::OK();
-  }
-
-  flows_[blob_file_number].AddInFlow(bytes);
-
-  return Status::OK();
-}
-
-Status BlobGarbageMeter::ProcessOutFlow(const Slice& key, const Slice& value) {
-  uint64_t blob_file_number = kInvalidBlobFileNumber;
-  uint64_t bytes = 0;
-
-  const Status s = Parse(key, value, &blob_file_number, &bytes);
-  if (!s.ok()) {
-    return s;
-  }
-
-  if (blob_file_number == kInvalidBlobFileNumber) {
-    return Status::OK();
-  }
-
-  // Note: in order to measure the amount of additional garbage, we only need to
-  // track the outflow for preexisting files, i.e. those that also had inflow.
-  // (Newly written files would only have outflow.)
-  auto it = flows_.find(blob_file_number);
-  if (it == flows_.end()) {
-    return Status::OK();
-  }
-
-  it->second.AddOutFlow(bytes);
-
-  return Status::OK();
-}
-
-Status BlobGarbageMeter::Parse(const Slice& key, const Slice& value,
-                               uint64_t* blob_file_number, uint64_t* bytes) {
-  assert(blob_file_number);
-  assert(*blob_file_number == kInvalidBlobFileNumber);
-  assert(bytes);
-  assert(*bytes == 0);
-
-  ParsedInternalKey ikey;
-
-  {
-    constexpr bool log_err_key = false;
-    const Status s = ParseInternalKey(key, &ikey, log_err_key);
-    if (!s.ok()) {
-      return s;
-    }
-  }
-
-  if (ikey.type != kTypeBlobIndex) {
-    return Status::OK();
-  }
-
-  BlobIndex blob_index;
-
-  {
-    const Status s = blob_index.DecodeFrom(value);
-    if (!s.ok()) {
-      return s;
-    }
-  }
-
-  if (blob_index.IsInlined() || blob_index.HasTTL()) {
-    return Status::Corruption("Unexpected TTL/inlined blob index");
-  }
-
-  *blob_file_number = blob_index.file_number();
-  *bytes =
-      blob_index.size() +
-      BlobLogRecord::CalculateAdjustmentForRecordHeader(ikey.user_key.size());
-
-  return Status::OK();
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,102 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <cassert>
-#include <cstdint>
-#include <unordered_map>
-
-#include "db/blob/blob_constants.h"
-#include "rocksdb/rocksdb_namespace.h"
-#include "rocksdb/status.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-class Slice;
-
-// A class that can be used to compute the amount of additional garbage
-// generated by a compaction. It parses the keys and blob references in the
-// input and output of a compaction, and aggregates the "inflow" and "outflow"
-// on a per-blob file basis. The amount of additional garbage for any given blob
-// file can then be computed by subtracting the outflow from the inflow.
-class BlobGarbageMeter {
- public:
-  // A class to store the number and total size of blobs on a per-blob file
-  // basis.
-  class BlobStats {
-   public:
-    void Add(uint64_t bytes) {
-      ++count_;
-      bytes_ += bytes;
-    }
-    void Add(uint64_t count, uint64_t bytes) {
-      count_ += count;
-      bytes_ += bytes;
-    }
-
-    uint64_t GetCount() const { return count_; }
-    uint64_t GetBytes() const { return bytes_; }
-
-   private:
-    uint64_t count_ = 0;
-    uint64_t bytes_ = 0;
-  };
-
-  // A class to keep track of the "inflow" and the "outflow" and to compute the
-  // amount of additional garbage for a given blob file.
-  class BlobInOutFlow {
-   public:
-    void AddInFlow(uint64_t bytes) {
-      in_flow_.Add(bytes);
-      assert(IsValid());
-    }
-    void AddOutFlow(uint64_t bytes) {
-      out_flow_.Add(bytes);
-      assert(IsValid());
-    }
-
-    const BlobStats& GetInFlow() const { return in_flow_; }
-    const BlobStats& GetOutFlow() const { return out_flow_; }
-
-    bool IsValid() const {
-      return in_flow_.GetCount() >= out_flow_.GetCount() &&
-             in_flow_.GetBytes() >= out_flow_.GetBytes();
-    }
-    bool HasGarbage() const {
-      assert(IsValid());
-      return in_flow_.GetCount() > out_flow_.GetCount();
-    }
-    uint64_t GetGarbageCount() const {
-      assert(IsValid());
-      assert(HasGarbage());
-      return in_flow_.GetCount() - out_flow_.GetCount();
-    }
-    uint64_t GetGarbageBytes() const {
-      assert(IsValid());
-      assert(HasGarbage());
-      return in_flow_.GetBytes() - out_flow_.GetBytes();
-    }
-
-   private:
-    BlobStats in_flow_;
-    BlobStats out_flow_;
-  };
-
-  Status ProcessInFlow(const Slice& key, const Slice& value);
-  Status ProcessOutFlow(const Slice& key, const Slice& value);
-
-  const std::unordered_map<uint64_t, BlobInOutFlow>& flows() const {
-    return flows_;
-  }
-
- private:
-  static Status Parse(const Slice& key, const Slice& value,
-                      uint64_t* blob_file_number, uint64_t* bytes);
-
-  std::unordered_map<uint64_t, BlobInOutFlow> flows_;
-};
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,196 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_garbage_meter.h"
-
-#include <string>
-#include <vector>
-
-#include "db/blob/blob_index.h"
-#include "db/blob/blob_log_format.h"
-#include "db/dbformat.h"
-#include "test_util/testharness.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-TEST(BlobGarbageMeterTest, MeasureGarbage) {
-  BlobGarbageMeter blob_garbage_meter;
-
-  struct BlobDescriptor {
-    std::string user_key;
-    uint64_t blob_file_number;
-    uint64_t offset;
-    uint64_t size;
-    CompressionType compression_type;
-    bool has_in_flow;
-    bool has_out_flow;
-
-    uint64_t GetExpectedBytes() const {
-      return size +
-             BlobLogRecord::CalculateAdjustmentForRecordHeader(user_key.size());
-    }
-  };
-
-  // Note: blob file 4 has the same inflow and outflow and hence no additional
-  // garbage. Blob file 5 has less outflow than inflow and thus it does have
-  // additional garbage. Blob file 6 is a newly written file (i.e. no inflow,
-  // only outflow) and is thus not tracked by the meter.
-  std::vector<BlobDescriptor> blobs{
-      {"key", 4, 1234, 555, kLZ4Compression, true, true},
-      {"other_key", 4, 6789, 101010, kLZ4Compression, true, true},
-      {"yet_another_key", 5, 22222, 3456, kLZ4Compression, true, true},
-      {"foo_key", 5, 77777, 8888, kLZ4Compression, true, true},
-      {"bar_key", 5, 999999, 1212, kLZ4Compression, true, false},
-      {"baz_key", 5, 1234567, 890, kLZ4Compression, true, false},
-      {"new_key", 6, 7777, 9999, kNoCompression, false, true}};
-
-  for (const auto& blob : blobs) {
-    constexpr SequenceNumber seq = 123;
-    const InternalKey key(blob.user_key, seq, kTypeBlobIndex);
-    const Slice key_slice = key.Encode();
-
-    std::string value;
-    BlobIndex::EncodeBlob(&value, blob.blob_file_number, blob.offset, blob.size,
-                          blob.compression_type);
-    const Slice value_slice(value);
-
-    if (blob.has_in_flow) {
-      ASSERT_OK(blob_garbage_meter.ProcessInFlow(key_slice, value_slice));
-    }
-    if (blob.has_out_flow) {
-      ASSERT_OK(blob_garbage_meter.ProcessOutFlow(key_slice, value_slice));
-    }
-  }
-
-  const auto& flows = blob_garbage_meter.flows();
-  ASSERT_EQ(flows.size(), 2);
-
-  {
-    const auto it = flows.find(4);
-    ASSERT_NE(it, flows.end());
-
-    const auto& flow = it->second;
-
-    constexpr uint64_t expected_count = 2;
-    const uint64_t expected_bytes =
-        blobs[0].GetExpectedBytes() + blobs[1].GetExpectedBytes();
-
-    const auto& in = flow.GetInFlow();
-    ASSERT_EQ(in.GetCount(), expected_count);
-    ASSERT_EQ(in.GetBytes(), expected_bytes);
-
-    const auto& out = flow.GetOutFlow();
-    ASSERT_EQ(out.GetCount(), expected_count);
-    ASSERT_EQ(out.GetBytes(), expected_bytes);
-
-    ASSERT_TRUE(flow.IsValid());
-    ASSERT_FALSE(flow.HasGarbage());
-  }
-
-  {
-    const auto it = flows.find(5);
-    ASSERT_NE(it, flows.end());
-
-    const auto& flow = it->second;
-
-    const auto& in = flow.GetInFlow();
-
-    constexpr uint64_t expected_in_count = 4;
-    const uint64_t expected_in_bytes =
-        blobs[2].GetExpectedBytes() + blobs[3].GetExpectedBytes() +
-        blobs[4].GetExpectedBytes() + blobs[5].GetExpectedBytes();
-
-    ASSERT_EQ(in.GetCount(), expected_in_count);
-    ASSERT_EQ(in.GetBytes(), expected_in_bytes);
-
-    const auto& out = flow.GetOutFlow();
-
-    constexpr uint64_t expected_out_count = 2;
-    const uint64_t expected_out_bytes =
-        blobs[2].GetExpectedBytes() + blobs[3].GetExpectedBytes();
-
-    ASSERT_EQ(out.GetCount(), expected_out_count);
-    ASSERT_EQ(out.GetBytes(), expected_out_bytes);
-
-    ASSERT_TRUE(flow.IsValid());
-    ASSERT_TRUE(flow.HasGarbage());
-    ASSERT_EQ(flow.GetGarbageCount(), expected_in_count - expected_out_count);
-    ASSERT_EQ(flow.GetGarbageBytes(), expected_in_bytes - expected_out_bytes);
-  }
-}
-
-TEST(BlobGarbageMeterTest, PlainValue) {
-  constexpr char user_key[] = "user_key";
-  constexpr SequenceNumber seq = 123;
-
-  const InternalKey key(user_key, seq, kTypeValue);
-  const Slice key_slice = key.Encode();
-
-  constexpr char value[] = "value";
-  const Slice value_slice(value);
-
-  BlobGarbageMeter blob_garbage_meter;
-
-  ASSERT_OK(blob_garbage_meter.ProcessInFlow(key_slice, value_slice));
-  ASSERT_OK(blob_garbage_meter.ProcessOutFlow(key_slice, value_slice));
-  ASSERT_TRUE(blob_garbage_meter.flows().empty());
-}
-
-TEST(BlobGarbageMeterTest, CorruptInternalKey) {
-  constexpr char corrupt_key[] = "i_am_corrupt";
-  const Slice key_slice(corrupt_key);
-
-  constexpr char value[] = "value";
-  const Slice value_slice(value);
-
-  BlobGarbageMeter blob_garbage_meter;
-
-  ASSERT_NOK(blob_garbage_meter.ProcessInFlow(key_slice, value_slice));
-  ASSERT_NOK(blob_garbage_meter.ProcessOutFlow(key_slice, value_slice));
-}
-
-TEST(BlobGarbageMeterTest, CorruptBlobIndex) {
-  constexpr char user_key[] = "user_key";
-  constexpr SequenceNumber seq = 123;
-
-  const InternalKey key(user_key, seq, kTypeBlobIndex);
-  const Slice key_slice = key.Encode();
-
-  constexpr char value[] = "i_am_not_a_blob_index";
-  const Slice value_slice(value);
-
-  BlobGarbageMeter blob_garbage_meter;
-
-  ASSERT_NOK(blob_garbage_meter.ProcessInFlow(key_slice, value_slice));
-  ASSERT_NOK(blob_garbage_meter.ProcessOutFlow(key_slice, value_slice));
-}
-
-TEST(BlobGarbageMeterTest, InlinedTTLBlobIndex) {
-  constexpr char user_key[] = "user_key";
-  constexpr SequenceNumber seq = 123;
-
-  const InternalKey key(user_key, seq, kTypeBlobIndex);
-  const Slice key_slice = key.Encode();
-
-  constexpr uint64_t expiration = 1234567890;
-  constexpr char inlined_value[] = "inlined";
-
-  std::string value;
-  BlobIndex::EncodeInlinedTTL(&value, expiration, inlined_value);
-
-  const Slice value_slice(value);
-
-  BlobGarbageMeter blob_garbage_meter;
-
-  ASSERT_NOK(blob_garbage_meter.ProcessInFlow(key_slice, value_slice));
-  ASSERT_NOK(blob_garbage_meter.ProcessOutFlow(key_slice, value_slice));
-}
-
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -52,9 +52,6 @@ class BlobIndex {

  BlobIndex() : type_(Type::kUnknown) {}

-  BlobIndex(const BlobIndex&) = default;
-  BlobIndex& operator=(const BlobIndex&) = default;
-
  bool IsInlined() const { return type_ == Type::kInlinedTTL; }

  bool HasTTL() const {
@@ -95,6 +95,10 @@ Status BlobLogFooter::DecodeFrom(Slice src) {
  return Status::OK();
 }

+uint64_t BlobLogRecord::CalculateAdjustmentForRecordHeader(uint64_t key_size) {
+  return key_size + kHeaderSize;
+}
+
 void BlobLogRecord::EncodeHeaderTo(std::string* dst) {
  assert(dst != nullptr);
  dst->clear();
@@ -107,10 +107,7 @@ struct BlobLogRecord {
  // Note that the offset field of BlobIndex actually points to the blob value
  // as opposed to the start of the blob record. The following method can
  // be used to calculate the adjustment needed to read the blob record header.
-  static constexpr uint64_t CalculateAdjustmentForRecordHeader(
-      uint64_t key_size) {
-    return key_size + kHeaderSize;
-  }
+  static uint64_t CalculateAdjustmentForRecordHeader(uint64_t key_size);

  uint64_t key_size = 0;
  uint64_t value_size = 0;
@@ -6,6 +6,8 @@

 #include "db/blob/blob_log_sequential_reader.h"

+#include <algorithm>
+
 #include "file/random_access_file_reader.h"
 #include "monitoring/statistics.h"
 #include "util/stop_watch.h"
@@ -13,10 +15,10 @@
 namespace ROCKSDB_NAMESPACE {

 BlobLogSequentialReader::BlobLogSequentialReader(
-    std::unique_ptr<RandomAccessFileReader>&& file_reader, SystemClock* clock,
+    std::unique_ptr<RandomAccessFileReader>&& file_reader, Env* env,
    Statistics* statistics)
    : file_(std::move(file_reader)),
-      clock_(clock),
+      env_(env),
      statistics_(statistics),
      next_byte_(0) {}

@@ -27,7 +29,7 @@ Status BlobLogSequentialReader::ReadSlice(uint64_t size, Slice* slice,
  assert(slice);
  assert(file_);

-  StopWatch read_sw(clock_, statistics_, BLOB_DB_BLOB_FILE_READ_MICROS);
+  StopWatch read_sw(env_, statistics_, BLOB_DB_BLOB_FILE_READ_MICROS);
  Status s = file_->Read(IOOptions(), next_byte_, static_cast<size_t>(size),
                         slice, buf, nullptr);
  next_byte_ += size;
@@ -10,15 +10,12 @@
 #include "db/blob/blob_log_format.h"
 #include "rocksdb/slice.h"

-#define MAX_HEADER_SIZE(a, b, c) (a > b ? (a > c ? a : c) : (b > c ? b : c))
-
 namespace ROCKSDB_NAMESPACE {

 class RandomAccessFileReader;
 class Env;
 class Statistics;
 class Status;
-class SystemClock;

 /**
 * BlobLogSequentialReader is a general purpose log stream reader
@@ -38,7 +35,7 @@ class BlobLogSequentialReader {

  // Create a reader that will return log records from "*file_reader".
  BlobLogSequentialReader(std::unique_ptr<RandomAccessFileReader>&& file_reader,
-                          SystemClock* clock, Statistics* statistics);
+                          Env* env, Statistics* statistics);

  // No copying allowed
  BlobLogSequentialReader(const BlobLogSequentialReader&) = delete;
@@ -66,18 +63,14 @@ class BlobLogSequentialReader {
  Status ReadSlice(uint64_t size, Slice* slice, char* buf);

  const std::unique_ptr<RandomAccessFileReader> file_;
-  SystemClock* clock_;
-
+  Env* env_;
  Statistics* statistics_;

  Slice buffer_;
-  char header_buf_[MAX_HEADER_SIZE(BlobLogHeader::kSize, BlobLogFooter::kSize,
-                                   BlobLogRecord::kHeaderSize)];
+  char header_buf_[BlobLogRecord::kHeaderSize];

  // which byte to read next
  uint64_t next_byte_;
 };

 }  // namespace ROCKSDB_NAMESPACE
-
-#undef MAX_HEADER_SIZE
@@ -11,7 +11,7 @@
 #include "db/blob/blob_log_format.h"
 #include "file/writable_file_writer.h"
 #include "monitoring/statistics.h"
-#include "rocksdb/system_clock.h"
+#include "rocksdb/env.h"
 #include "test_util/sync_point.h"
 #include "util/coding.h"
 #include "util/stop_watch.h"
@@ -19,16 +19,14 @@
 namespace ROCKSDB_NAMESPACE {

 BlobLogWriter::BlobLogWriter(std::unique_ptr<WritableFileWriter>&& dest,
-                             SystemClock* clock, Statistics* statistics,
-                             uint64_t log_number, bool use_fs, bool do_flush,
-                             uint64_t boffset)
+                             Env* env, Statistics* statistics,
+                             uint64_t log_number, bool use_fs, uint64_t boffset)
    : dest_(std::move(dest)),
-      clock_(clock),
+      env_(env),
      statistics_(statistics),
      log_number_(log_number),
      block_offset_(boffset),
      use_fsync_(use_fs),
-      do_flush_(do_flush),
      last_elem_type_(kEtNone) {}

 BlobLogWriter::~BlobLogWriter() = default;
@@ -36,7 +34,7 @@ BlobLogWriter::~BlobLogWriter() = default;
 Status BlobLogWriter::Sync() {
  TEST_SYNC_POINT("BlobLogWriter::Sync");

-  StopWatch sync_sw(clock_, statistics_, BLOB_DB_BLOB_FILE_SYNC_MICROS);
+  StopWatch sync_sw(env_, statistics_, BLOB_DB_BLOB_FILE_SYNC_MICROS);
  Status s = dest_->Sync(use_fsync_);
  RecordTick(statistics_, BLOB_DB_BLOB_FILE_SYNCED);
  return s;
@@ -51,9 +49,7 @@ Status BlobLogWriter::WriteHeader(BlobLogHeader& header) {
  Status s = dest_->Append(Slice(str));
  if (s.ok()) {
    block_offset_ += str.size();
-    if (do_flush_) {
-      s = dest_->Flush();
-    }
+    s = dest_->Flush();
  }
  last_elem_type_ = kEtFileHdr;
  RecordTick(statistics_, BLOB_DB_BLOB_FILE_BYTES_WRITTEN,
@@ -148,7 +144,7 @@ Status BlobLogWriter::EmitPhysicalRecord(const std::string& headerbuf,
                                         const Slice& key, const Slice& val,
                                         uint64_t* key_offset,
                                         uint64_t* blob_offset) {
-  StopWatch write_sw(clock_, statistics_, BLOB_DB_BLOB_FILE_WRITE_MICROS);
+  StopWatch write_sw(env_, statistics_, BLOB_DB_BLOB_FILE_WRITE_MICROS);
  Status s = dest_->Append(Slice(headerbuf));
  if (s.ok()) {
    s = dest_->Append(key);
@@ -156,7 +152,7 @@ Status BlobLogWriter::EmitPhysicalRecord(const std::string& headerbuf,
  if (s.ok()) {
    s = dest_->Append(val);
  }
-  if (do_flush_ && s.ok()) {
+  if (s.ok()) {
    s = dest_->Flush();
  }

@@ -9,6 +9,7 @@
 #include <string>

 #include "db/blob/blob_log_format.h"
+#include "rocksdb/env.h"
 #include "rocksdb/slice.h"
 #include "rocksdb/statistics.h"
 #include "rocksdb/status.h"
@@ -17,7 +18,7 @@
 namespace ROCKSDB_NAMESPACE {

 class WritableFileWriter;
-class SystemClock;
+
 /**
 * BlobLogWriter is the blob log stream writer. It provides an append-only
 * abstraction for writing blob data.
@@ -31,9 +32,9 @@ class BlobLogWriter {
  // Create a writer that will append data to "*dest".
  // "*dest" must be initially empty.
  // "*dest" must remain live while this BlobLogWriter is in use.
-  BlobLogWriter(std::unique_ptr<WritableFileWriter>&& dest, SystemClock* clock,
+  BlobLogWriter(std::unique_ptr<WritableFileWriter>&& dest, Env* env,
                Statistics* statistics, uint64_t log_number, bool use_fsync,
-                bool do_flush, uint64_t boffset = 0);
+                uint64_t boffset = 0);
  // No copying allowed
  BlobLogWriter(const BlobLogWriter&) = delete;
  BlobLogWriter& operator=(const BlobLogWriter&) = delete;
@@ -68,12 +69,11 @@ class BlobLogWriter {

 private:
  std::unique_ptr<WritableFileWriter> dest_;
-  SystemClock* clock_;
+  Env* env_;
  Statistics* statistics_;
  uint64_t log_number_;
  uint64_t block_offset_;  // Current offset in block
  bool use_fsync_;
-  bool do_flush_;

 public:
  enum ElemType { kEtNone, kEtFileHdr, kEtRecord, kEtFileFooter };
@@ -1,718 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/blob_index.h"
-#include "db/blob/blob_log_format.h"
-#include "db/db_test_util.h"
-#include "port/stack_trace.h"
-#include "test_util/sync_point.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-class DBBlobCompactionTest : public DBTestBase {
- public:
-  explicit DBBlobCompactionTest()
-      : DBTestBase("db_blob_compaction_test", /*env_do_fsync=*/false) {}
-
-#ifndef ROCKSDB_LITE
-  const std::vector<InternalStats::CompactionStats>& GetCompactionStats() {
-    VersionSet* const versions = dbfull()->TEST_GetVersionSet();
-    assert(versions);
-    assert(versions->GetColumnFamilySet());
-
-    ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
-    assert(cfd);
-
-    const InternalStats* const internal_stats = cfd->internal_stats();
-    assert(internal_stats);
-
-    return internal_stats->TEST_GetCompactionStats();
-  }
-#endif  // ROCKSDB_LITE
-};
-
-namespace {
-
-class FilterByKeyLength : public CompactionFilter {
- public:
-  explicit FilterByKeyLength(size_t len) : length_threshold_(len) {}
-  const char* Name() const override {
-    return "rocksdb.compaction.filter.by.key.length";
-  }
-  CompactionFilter::Decision FilterBlobByKey(
-      int /*level*/, const Slice& key, std::string* /*new_value*/,
-      std::string* /*skip_until*/) const override {
-    if (key.size() < length_threshold_) {
-      return CompactionFilter::Decision::kRemove;
-    }
-    return CompactionFilter::Decision::kKeep;
-  }
-
- private:
-  size_t length_threshold_;
-};
-
-class BadBlobCompactionFilter : public CompactionFilter {
- public:
-  explicit BadBlobCompactionFilter(std::string prefix,
-                                   CompactionFilter::Decision filter_by_key,
-                                   CompactionFilter::Decision filter_v2)
-      : prefix_(std::move(prefix)),
-        filter_blob_by_key_(filter_by_key),
-        filter_v2_(filter_v2) {}
-  const char* Name() const override { return "rocksdb.compaction.filter.bad"; }
-  CompactionFilter::Decision FilterBlobByKey(
-      int /*level*/, const Slice& key, std::string* /*new_value*/,
-      std::string* /*skip_until*/) const override {
-    if (key.size() >= prefix_.size() &&
-        0 == strncmp(prefix_.data(), key.data(), prefix_.size())) {
-      return CompactionFilter::Decision::kUndetermined;
-    }
-    return filter_blob_by_key_;
-  }
-  CompactionFilter::Decision FilterV2(
-      int /*level*/, const Slice& /*key*/, ValueType /*value_type*/,
-      const Slice& /*existing_value*/, std::string* /*new_value*/,
-      std::string* /*skip_until*/) const override {
-    return filter_v2_;
-  }
-
- private:
-  const std::string prefix_;
-  const CompactionFilter::Decision filter_blob_by_key_;
-  const CompactionFilter::Decision filter_v2_;
-};
-
-class ValueBlindWriteFilter : public CompactionFilter {
- public:
-  explicit ValueBlindWriteFilter(std::string new_val)
-      : new_value_(std::move(new_val)) {}
-  const char* Name() const override {
-    return "rocksdb.compaction.filter.blind.write";
-  }
-  CompactionFilter::Decision FilterBlobByKey(
-      int level, const Slice& key, std::string* new_value,
-      std::string* skip_until) const override;
-
- private:
-  const std::string new_value_;
-};
-
-CompactionFilter::Decision ValueBlindWriteFilter::FilterBlobByKey(
-    int /*level*/, const Slice& /*key*/, std::string* new_value,
-    std::string* /*skip_until*/) const {
-  assert(new_value);
-  new_value->assign(new_value_);
-  return CompactionFilter::Decision::kChangeValue;
-}
-
-class ValueMutationFilter : public CompactionFilter {
- public:
-  explicit ValueMutationFilter(std::string padding)
-      : padding_(std::move(padding)) {}
-  const char* Name() const override {
-    return "rocksdb.compaction.filter.value.mutation";
-  }
-  CompactionFilter::Decision FilterV2(int level, const Slice& key,
-                                      ValueType value_type,
-                                      const Slice& existing_value,
-                                      std::string* new_value,
-                                      std::string* skip_until) const override;
-
- private:
-  const std::string padding_;
-};
-
-CompactionFilter::Decision ValueMutationFilter::FilterV2(
-    int /*level*/, const Slice& /*key*/, ValueType value_type,
-    const Slice& existing_value, std::string* new_value,
-    std::string* /*skip_until*/) const {
-  assert(CompactionFilter::ValueType::kBlobIndex != value_type);
-  if (CompactionFilter::ValueType::kValue != value_type) {
-    return CompactionFilter::Decision::kKeep;
-  }
-  assert(new_value);
-  new_value->assign(existing_value.data(), existing_value.size());
-  new_value->append(padding_);
-  return CompactionFilter::Decision::kChangeValue;
-}
-
-class AlwaysKeepFilter : public CompactionFilter {
- public:
-  explicit AlwaysKeepFilter() = default;
-  const char* Name() const override {
-    return "rocksdb.compaction.filter.always.keep";
-  }
-  CompactionFilter::Decision FilterV2(
-      int /*level*/, const Slice& /*key*/, ValueType /*value_type*/,
-      const Slice& /*existing_value*/, std::string* /*new_value*/,
-      std::string* /*skip_until*/) const override {
-    return CompactionFilter::Decision::kKeep;
-  }
-};
-
-class SkipUntilFilter : public CompactionFilter {
- public:
-  explicit SkipUntilFilter(std::string skip_until)
-      : skip_until_(std::move(skip_until)) {}
-
-  const char* Name() const override {
-    return "rocksdb.compaction.filter.skip.until";
-  }
-
-  CompactionFilter::Decision FilterV2(int /* level */, const Slice& /* key */,
-                                      ValueType /* value_type */,
-                                      const Slice& /* existing_value */,
-                                      std::string* /* new_value */,
-                                      std::string* skip_until) const override {
-    assert(skip_until);
-    *skip_until = skip_until_;
-
-    return CompactionFilter::Decision::kRemoveAndSkipUntil;
-  }
-
- private:
-  std::string skip_until_;
-};
-
-}  // anonymous namespace
-
-class DBBlobBadCompactionFilterTest
-    : public DBBlobCompactionTest,
-      public testing::WithParamInterface<
-          std::tuple<std::string, CompactionFilter::Decision,
-                     CompactionFilter::Decision>> {
- public:
-  explicit DBBlobBadCompactionFilterTest()
-      : compaction_filter_guard_(new BadBlobCompactionFilter(
-            std::get<0>(GetParam()), std::get<1>(GetParam()),
-            std::get<2>(GetParam()))) {}
-
- protected:
-  std::unique_ptr<CompactionFilter> compaction_filter_guard_;
-};
-
-INSTANTIATE_TEST_CASE_P(
-    BadCompactionFilter, DBBlobBadCompactionFilterTest,
-    testing::Combine(
-        testing::Values("a"),
-        testing::Values(CompactionFilter::Decision::kChangeBlobIndex,
-                        CompactionFilter::Decision::kIOError),
-        testing::Values(CompactionFilter::Decision::kUndetermined,
-                        CompactionFilter::Decision::kChangeBlobIndex,
-                        CompactionFilter::Decision::kIOError)));
-
-TEST_F(DBBlobCompactionTest, FilterByKeyLength) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.create_if_missing = true;
-  constexpr size_t kKeyLength = 2;
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new FilterByKeyLength(kKeyLength));
-  options.compaction_filter = compaction_filter_guard.get();
-
-  constexpr char short_key[] = "a";
-  constexpr char long_key[] = "abc";
-  constexpr char blob_value[] = "value";
-
-  DestroyAndReopen(options);
-  ASSERT_OK(Put(short_key, blob_value));
-  ASSERT_OK(Put(long_key, blob_value));
-  ASSERT_OK(Flush());
-  CompactRangeOptions cro;
-  ASSERT_OK(db_->CompactRange(cro, /*begin=*/nullptr, /*end=*/nullptr));
-  std::string value;
-  ASSERT_TRUE(db_->Get(ReadOptions(), short_key, &value).IsNotFound());
-  value.clear();
-  ASSERT_OK(db_->Get(ReadOptions(), long_key, &value));
-  ASSERT_EQ("value", value);
-
-#ifndef ROCKSDB_LITE
-  const auto& compaction_stats = GetCompactionStats();
-  ASSERT_GE(compaction_stats.size(), 2);
-
-  // Filter decides between kKeep and kRemove solely based on key;
-  // this involves neither reading nor writing blobs
-  ASSERT_EQ(compaction_stats[1].bytes_read_blob, 0);
-  ASSERT_EQ(compaction_stats[1].bytes_written_blob, 0);
-#endif  // ROCKSDB_LITE
-
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, BlindWriteFilter) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.create_if_missing = true;
-  constexpr char new_blob_value[] = "new_blob_value";
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new ValueBlindWriteFilter(new_blob_value));
-  options.compaction_filter = compaction_filter_guard.get();
-  DestroyAndReopen(options);
-  const std::vector<std::string> keys = {"a", "b", "c"};
-  const std::vector<std::string> values = {"a_value", "b_value", "c_value"};
-  assert(keys.size() == values.size());
-  for (size_t i = 0; i < keys.size(); ++i) {
-    ASSERT_OK(Put(keys[i], values[i]));
-  }
-  ASSERT_OK(Flush());
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                              /*end=*/nullptr));
-  for (const auto& key : keys) {
-    ASSERT_EQ(new_blob_value, Get(key));
-  }
-
-#ifndef ROCKSDB_LITE
-  const auto& compaction_stats = GetCompactionStats();
-  ASSERT_GE(compaction_stats.size(), 2);
-
-  // Filter unconditionally changes value in FilterBlobByKey;
-  // this involves writing but not reading blobs
-  ASSERT_EQ(compaction_stats[1].bytes_read_blob, 0);
-  ASSERT_GT(compaction_stats[1].bytes_written_blob, 0);
-#endif  // ROCKSDB_LITE
-
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, SkipUntilFilter) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new SkipUntilFilter("z"));
-  options.compaction_filter = compaction_filter_guard.get();
-
-  Reopen(options);
-
-  const std::vector<std::string> keys{"a", "b", "c"};
-  const std::vector<std::string> values{"a_value", "b_value", "c_value"};
-  assert(keys.size() == values.size());
-
-  for (size_t i = 0; i < keys.size(); ++i) {
-    ASSERT_OK(Put(keys[i], values[i]));
-  }
-
-  ASSERT_OK(Flush());
-
-  int process_in_flow_called = 0;
-
-  SyncPoint::GetInstance()->SetCallBack(
-      "BlobCountingIterator::UpdateAndCountBlobIfNeeded:ProcessInFlow",
-      [&process_in_flow_called](void* /* arg */) { ++process_in_flow_called; });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), /* begin */ nullptr,
-                              /* end */ nullptr));
-
-  SyncPoint::GetInstance()->DisableProcessing();
-  SyncPoint::GetInstance()->ClearAllCallBacks();
-
-  for (const auto& key : keys) {
-    ASSERT_EQ(Get(key), "NOT_FOUND");
-  }
-
-  // Make sure SkipUntil was performed using iteration rather than Seek
-  ASSERT_EQ(process_in_flow_called, keys.size());
-
-  Close();
-}
-
-TEST_P(DBBlobBadCompactionFilterTest, BadDecisionFromCompactionFilter) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.create_if_missing = true;
-  options.compaction_filter = compaction_filter_guard_.get();
-  DestroyAndReopen(options);
-  ASSERT_OK(Put("b", "value"));
-  ASSERT_OK(Flush());
-  ASSERT_TRUE(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                                /*end=*/nullptr)
-                  .IsNotSupported());
-  Close();
-
-  DestroyAndReopen(options);
-  std::string key(std::get<0>(GetParam()));
-  ASSERT_OK(Put(key, "value"));
-  ASSERT_OK(Flush());
-  ASSERT_TRUE(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                                /*end=*/nullptr)
-                  .IsNotSupported());
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CompactionFilter_InlinedTTLIndex) {
-  Options options = GetDefaultOptions();
-  options.create_if_missing = true;
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new ValueMutationFilter(""));
-  options.compaction_filter = compaction_filter_guard.get();
-  DestroyAndReopen(options);
-  constexpr char key[] = "key";
-  constexpr char blob[] = "blob";
-  // Fake an inlined TTL blob index.
-  std::string blob_index;
-  constexpr uint64_t expiration = 1234567890;
-  BlobIndex::EncodeInlinedTTL(&blob_index, expiration, blob);
-  WriteBatch batch;
-  ASSERT_OK(WriteBatchInternal::PutBlobIndex(&batch, 0, key, blob_index));
-  ASSERT_OK(db_->Write(WriteOptions(), &batch));
-  ASSERT_OK(Flush());
-  ASSERT_TRUE(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                                /*end=*/nullptr)
-                  .IsCorruption());
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CompactionFilter) {
-  Options options = GetDefaultOptions();
-  options.create_if_missing = true;
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  constexpr char padding[] = "_delta";
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new ValueMutationFilter(padding));
-  options.compaction_filter = compaction_filter_guard.get();
-  DestroyAndReopen(options);
-  const std::vector<std::pair<std::string, std::string>> kvs = {
-      {"a", "a_value"}, {"b", "b_value"}, {"c", "c_value"}};
-  for (const auto& kv : kvs) {
-    ASSERT_OK(Put(kv.first, kv.second));
-  }
-  ASSERT_OK(Flush());
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                              /*end=*/nullptr));
-  for (const auto& kv : kvs) {
-    ASSERT_EQ(kv.second + std::string(padding), Get(kv.first));
-  }
-
-#ifndef ROCKSDB_LITE
-  const auto& compaction_stats = GetCompactionStats();
-  ASSERT_GE(compaction_stats.size(), 2);
-
-  // Filter changes the value using the previous value in FilterV2;
-  // this involves reading and writing blobs
-  ASSERT_GT(compaction_stats[1].bytes_read_blob, 0);
-  ASSERT_GT(compaction_stats[1].bytes_written_blob, 0);
-#endif  // ROCKSDB_LITE
-
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CorruptedBlobIndex) {
-  Options options = GetDefaultOptions();
-  options.create_if_missing = true;
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new ValueMutationFilter(""));
-  options.compaction_filter = compaction_filter_guard.get();
-  DestroyAndReopen(options);
-  // Mock a corrupted blob index
-  constexpr char key[] = "key";
-  std::string blob_idx("blob_idx");
-  WriteBatch write_batch;
-  ASSERT_OK(WriteBatchInternal::PutBlobIndex(&write_batch, 0, key, blob_idx));
-  ASSERT_OK(db_->Write(WriteOptions(), &write_batch));
-  ASSERT_OK(Flush());
-  ASSERT_TRUE(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                                /*end=*/nullptr)
-                  .IsCorruption());
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CompactionFilterReadBlobAndKeep) {
-  Options options = GetDefaultOptions();
-  options.create_if_missing = true;
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new AlwaysKeepFilter());
-  options.compaction_filter = compaction_filter_guard.get();
-  DestroyAndReopen(options);
-  ASSERT_OK(Put("foo", "foo_value"));
-  ASSERT_OK(Flush());
-  std::vector<uint64_t> blob_files = GetBlobFileNumbers();
-  ASSERT_EQ(1, blob_files.size());
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                              /*end=*/nullptr));
-  ASSERT_EQ(blob_files, GetBlobFileNumbers());
-
-#ifndef ROCKSDB_LITE
-  const auto& compaction_stats = GetCompactionStats();
-  ASSERT_GE(compaction_stats.size(), 2);
-
-  // Filter decides to keep the existing value in FilterV2;
-  // this involves reading but not writing blobs
-  ASSERT_GT(compaction_stats[1].bytes_read_blob, 0);
-  ASSERT_EQ(compaction_stats[1].bytes_written_blob, 0);
-#endif  // ROCKSDB_LITE
-
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, TrackGarbage) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-
-  Reopen(options);
-
-  // First table+blob file pair: 4 blobs with different keys
-  constexpr char first_key[] = "first_key";
-  constexpr char first_value[] = "first_value";
-  constexpr char second_key[] = "second_key";
-  constexpr char second_value[] = "second_value";
-  constexpr char third_key[] = "third_key";
-  constexpr char third_value[] = "third_value";
-  constexpr char fourth_key[] = "fourth_key";
-  constexpr char fourth_value[] = "fourth_value";
-
-  ASSERT_OK(Put(first_key, first_value));
-  ASSERT_OK(Put(second_key, second_value));
-  ASSERT_OK(Put(third_key, third_value));
-  ASSERT_OK(Put(fourth_key, fourth_value));
-  ASSERT_OK(Flush());
-
-  // Second table+blob file pair: overwrite 2 existing keys
-  constexpr char new_first_value[] = "new_first_value";
-  constexpr char new_second_value[] = "new_second_value";
-
-  ASSERT_OK(Put(first_key, new_first_value));
-  ASSERT_OK(Put(second_key, new_second_value));
-  ASSERT_OK(Flush());
-
-  // Compact them together. The first blob file should have 2 garbage blobs
-  // corresponding to the 2 overwritten keys.
-  constexpr Slice* begin = nullptr;
-  constexpr Slice* end = nullptr;
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), begin, end));
-
-  VersionSet* const versions = dbfull()->TEST_GetVersionSet();
-  assert(versions);
-  assert(versions->GetColumnFamilySet());
-
-  ColumnFamilyData* const cfd = versions->GetColumnFamilySet()->GetDefault();
-  assert(cfd);
-
-  Version* const current = cfd->current();
-  assert(current);
-
-  const VersionStorageInfo* const storage_info = current->storage_info();
-  assert(storage_info);
-
-  const auto& blob_files = storage_info->GetBlobFiles();
-  ASSERT_EQ(blob_files.size(), 2);
-
-  {
-    auto it = blob_files.begin();
-    const auto& meta = it->second;
-    assert(meta);
-
-    constexpr uint64_t first_expected_bytes =
-        sizeof(first_value) - 1 +
-        BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(first_key) -
-                                                          1);
-    constexpr uint64_t second_expected_bytes =
-        sizeof(second_value) - 1 +
-        BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(second_key) -
-                                                          1);
-    constexpr uint64_t third_expected_bytes =
-        sizeof(third_value) - 1 +
-        BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(third_key) -
-                                                          1);
-    constexpr uint64_t fourth_expected_bytes =
-        sizeof(fourth_value) - 1 +
-        BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(fourth_key) -
-                                                          1);
-
-    ASSERT_EQ(meta->GetTotalBlobCount(), 4);
-    ASSERT_EQ(meta->GetTotalBlobBytes(),
-              first_expected_bytes + second_expected_bytes +
-                  third_expected_bytes + fourth_expected_bytes);
-    ASSERT_EQ(meta->GetGarbageBlobCount(), 2);
-    ASSERT_EQ(meta->GetGarbageBlobBytes(),
-              first_expected_bytes + second_expected_bytes);
-  }
-
-  {
-    auto it = blob_files.rbegin();
-    const auto& meta = it->second;
-    assert(meta);
-
-    constexpr uint64_t new_first_expected_bytes =
-        sizeof(new_first_value) - 1 +
-        BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(first_key) -
-                                                          1);
-    constexpr uint64_t new_second_expected_bytes =
-        sizeof(new_second_value) - 1 +
-        BlobLogRecord::CalculateAdjustmentForRecordHeader(sizeof(second_key) -
-                                                          1);
-
-    ASSERT_EQ(meta->GetTotalBlobCount(), 2);
-    ASSERT_EQ(meta->GetTotalBlobBytes(),
-              new_first_expected_bytes + new_second_expected_bytes);
-    ASSERT_EQ(meta->GetGarbageBlobCount(), 0);
-    ASSERT_EQ(meta->GetGarbageBlobBytes(), 0);
-  }
-}
-
-TEST_F(DBBlobCompactionTest, MergeBlobWithBase) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.merge_operator = MergeOperators::CreateStringAppendOperator();
-  options.disable_auto_compactions = true;
-
-  Reopen(options);
-  ASSERT_OK(Put("Key1", "v1_1"));
-  ASSERT_OK(Put("Key2", "v2_1"));
-  ASSERT_OK(Flush());
-
-  ASSERT_OK(Merge("Key1", "v1_2"));
-  ASSERT_OK(Merge("Key2", "v2_2"));
-  ASSERT_OK(Flush());
-
-  ASSERT_OK(Merge("Key1", "v1_3"));
-  ASSERT_OK(Flush());
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), /*begin=*/nullptr,
-                              /*end=*/nullptr));
-  ASSERT_EQ(Get("Key1"), "v1_1,v1_2,v1_3");
-  ASSERT_EQ(Get("Key2"), "v2_1,v2_2");
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CompactionReadaheadGarbageCollection) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.enable_blob_garbage_collection = true;
-  options.blob_garbage_collection_age_cutoff = 1.0;
-  options.blob_compaction_readahead_size = 1 << 10;
-  options.disable_auto_compactions = true;
-
-  Reopen(options);
-
-  ASSERT_OK(Put("key", "lime"));
-  ASSERT_OK(Put("foo", "bar"));
-  ASSERT_OK(Flush());
-
-  ASSERT_OK(Put("key", "pie"));
-  ASSERT_OK(Put("foo", "baz"));
-  ASSERT_OK(Flush());
-
-  size_t num_non_prefetch_reads = 0;
-  SyncPoint::GetInstance()->SetCallBack(
-      "BlobFileReader::GetBlob:ReadFromFile",
-      [&num_non_prefetch_reads](void* /* arg */) { ++num_non_prefetch_reads; });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  constexpr Slice* begin = nullptr;
-  constexpr Slice* end = nullptr;
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), begin, end));
-
-  SyncPoint::GetInstance()->DisableProcessing();
-  SyncPoint::GetInstance()->ClearAllCallBacks();
-
-  ASSERT_EQ(Get("key"), "pie");
-  ASSERT_EQ(Get("foo"), "baz");
-  ASSERT_EQ(num_non_prefetch_reads, 0);
-
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CompactionReadaheadFilter) {
-  Options options = GetDefaultOptions();
-
-  std::unique_ptr<CompactionFilter> compaction_filter_guard(
-      new ValueMutationFilter("pie"));
-
-  options.compaction_filter = compaction_filter_guard.get();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.blob_compaction_readahead_size = 1 << 10;
-  options.disable_auto_compactions = true;
-
-  Reopen(options);
-
-  ASSERT_OK(Put("key", "lime"));
-  ASSERT_OK(Put("foo", "bar"));
-  ASSERT_OK(Flush());
-
-  size_t num_non_prefetch_reads = 0;
-  SyncPoint::GetInstance()->SetCallBack(
-      "BlobFileReader::GetBlob:ReadFromFile",
-      [&num_non_prefetch_reads](void* /* arg */) { ++num_non_prefetch_reads; });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  constexpr Slice* begin = nullptr;
-  constexpr Slice* end = nullptr;
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), begin, end));
-
-  SyncPoint::GetInstance()->DisableProcessing();
-  SyncPoint::GetInstance()->ClearAllCallBacks();
-
-  ASSERT_EQ(Get("key"), "limepie");
-  ASSERT_EQ(Get("foo"), "barpie");
-  ASSERT_EQ(num_non_prefetch_reads, 0);
-
-  Close();
-}
-
-TEST_F(DBBlobCompactionTest, CompactionReadaheadMerge) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.blob_compaction_readahead_size = 1 << 10;
-  options.merge_operator = MergeOperators::CreateStringAppendOperator();
-  options.disable_auto_compactions = true;
-
-  Reopen(options);
-
-  ASSERT_OK(Put("key", "lime"));
-  ASSERT_OK(Put("foo", "bar"));
-  ASSERT_OK(Flush());
-
-  ASSERT_OK(Merge("key", "pie"));
-  ASSERT_OK(Merge("foo", "baz"));
-  ASSERT_OK(Flush());
-
-  size_t num_non_prefetch_reads = 0;
-  SyncPoint::GetInstance()->SetCallBack(
-      "BlobFileReader::GetBlob:ReadFromFile",
-      [&num_non_prefetch_reads](void* /* arg */) { ++num_non_prefetch_reads; });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  constexpr Slice* begin = nullptr;
-  constexpr Slice* end = nullptr;
-
-  ASSERT_OK(db_->CompactRange(CompactRangeOptions(), begin, end));
-
-  SyncPoint::GetInstance()->DisableProcessing();
-  SyncPoint::GetInstance()->ClearAllCallBacks();
-
-  ASSERT_EQ(Get("key"), "lime,pie");
-  ASSERT_EQ(Get("foo"), "bar,baz");
-  ASSERT_EQ(num_non_prefetch_reads, 0);
-
-  Close();
-}
-
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  RegisterCustomObjects(argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -1,82 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/db_test_util.h"
-#include "port/stack_trace.h"
-#include "test_util/sync_point.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-class DBBlobCorruptionTest : public DBTestBase {
- protected:
-  DBBlobCorruptionTest()
-      : DBTestBase("db_blob_corruption_test", /* env_do_fsync */ false) {}
-
-  void Corrupt(FileType filetype, int offset, int bytes_to_corrupt) {
-    // Pick file to corrupt
-    std::vector<std::string> filenames;
-    ASSERT_OK(env_->GetChildren(dbname_, &filenames));
-    uint64_t number;
-    FileType type;
-    std::string fname;
-    uint64_t picked_number = kInvalidBlobFileNumber;
-    for (size_t i = 0; i < filenames.size(); i++) {
-      if (ParseFileName(filenames[i], &number, &type) && type == filetype &&
-          number > picked_number) {  // Pick latest file
-        fname = dbname_ + "/" + filenames[i];
-        picked_number = number;
-      }
-    }
-    ASSERT_TRUE(!fname.empty()) << filetype;
-    ASSERT_OK(test::CorruptFile(env_, fname, offset, bytes_to_corrupt));
-  }
-};
-
-#ifndef ROCKSDB_LITE
-TEST_F(DBBlobCorruptionTest, VerifyWholeBlobFileChecksum) {
-  Options options = GetDefaultOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-  options.create_if_missing = true;
-  options.file_checksum_gen_factory =
-      ROCKSDB_NAMESPACE::GetFileChecksumGenCrc32cFactory();
-  Reopen(options);
-
-  ASSERT_OK(Put(Slice("key_1"), Slice("blob_value_1")));
-  ASSERT_OK(Flush());
-  ASSERT_OK(Put(Slice("key_2"), Slice("blob_value_2")));
-  ASSERT_OK(Flush());
-  ASSERT_OK(db_->VerifyFileChecksums(ReadOptions()));
-  Close();
-
-  Corrupt(kBlobFile, 0, 2);
-
-  ASSERT_OK(TryReopen(options));
-
-  int count{0};
-  SyncPoint::GetInstance()->SetCallBack(
-      "DBImpl::VerifyFullFileChecksum:mismatch", [&](void* arg) {
-        const Status* s = static_cast<Status*>(arg);
-        ASSERT_NE(s, nullptr);
-        ++count;
-        ASSERT_NOK(*s);
-      });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  ASSERT_TRUE(db_->VerifyFileChecksums(ReadOptions()).IsCorruption());
-  ASSERT_EQ(1, count);
-
-  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
-  ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->ClearAllCallBacks();
-}
-#endif  // !ROCKSDB_LITE
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
-  ::testing::InitGoogleTest(&argc, argv);
-  RegisterCustomObjects(argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -41,7 +41,8 @@ class DBBlobIndexTest : public DBTestBase {
                                       Tier::kImmutableMemtables,
                                       Tier::kL0SstFile, Tier::kLnSstFile};

-  DBBlobIndexTest() : DBTestBase("db_blob_index_test", /*env_do_fsync=*/true) {}
+  DBBlobIndexTest()
+      : DBTestBase("/db_blob_index_test", /*env_do_fsync=*/true) {}

  ColumnFamilyHandle* cfh() { return dbfull()->DefaultColumnFamily(); }

@@ -72,9 +73,6 @@ class DBBlobIndexTest : public DBTestBase {
    if (s.IsNotFound()) {
      return "NOT_FOUND";
    }
-    if (s.IsCorruption()) {
-      return "CORRUPTION";
-    }
    if (s.IsNotSupported()) {
      return "NOT_SUPPORTED";
    }
@@ -97,12 +95,11 @@ class DBBlobIndexTest : public DBTestBase {
  ArenaWrappedDBIter* GetBlobIterator() {
    return dbfull()->NewIteratorImpl(
        ReadOptions(), cfd(), dbfull()->GetLatestSequenceNumber(),
-        nullptr /*read_callback*/, true /*expose_blob_index*/);
+        nullptr /*read_callback*/, true /*allow_blob*/);
  }

  Options GetTestOptions() {
    Options options;
-    options.env = CurrentOptions().env;
    options.create_if_missing = true;
    options.num_levels = 2;
    options.disable_auto_compactions = true;
@@ -156,13 +153,8 @@ TEST_F(DBBlobIndexTest, Write) {
  }
 }

-// Note: the following test case pertains to the StackableDB-based BlobDB
-// implementation. Get should be able to return blob index if is_blob_index is
-// provided, otherwise it should return Status::NotSupported (when reading from
-// memtable) or Status::Corruption (when reading from SST). Reading from SST
-// returns Corruption because we can't differentiate between the application
-// accidentally opening the base DB of a stacked BlobDB and actual corruption
-// when using the integrated BlobDB.
+// Get should be able to return blob index if is_blob_index is provided,
+// otherwise return Status::NotSupported status.
 TEST_F(DBBlobIndexTest, Get) {
  for (auto tier : kAllTiers) {
    DestroyAndReopen(GetTestOptions());
@@ -179,22 +171,15 @@ TEST_F(DBBlobIndexTest, Get) {
    ASSERT_EQ("value", GetImpl("key", &is_blob_index));
    ASSERT_FALSE(is_blob_index);
    // Verify blob index
-    if (tier <= kImmutableMemtables) {
-      ASSERT_TRUE(Get("blob_key", &value).IsNotSupported());
-      ASSERT_EQ("NOT_SUPPORTED", GetImpl("blob_key"));
-    } else {
-      ASSERT_TRUE(Get("blob_key", &value).IsCorruption());
-      ASSERT_EQ("CORRUPTION", GetImpl("blob_key"));
-    }
+    ASSERT_TRUE(Get("blob_key", &value).IsNotSupported());
+    ASSERT_EQ("NOT_SUPPORTED", GetImpl("blob_key"));
    ASSERT_EQ("blob_index", GetImpl("blob_key", &is_blob_index));
    ASSERT_TRUE(is_blob_index);
  }
 }

-// Note: the following test case pertains to the StackableDB-based BlobDB
-// implementation. Get should NOT return Status::NotSupported/Status::Corruption
-// if blob index is updated with a normal value. See the test case above for
-// more details.
+// Get should NOT return Status::NotSupported if blob index is updated with
+// a normal value.
 TEST_F(DBBlobIndexTest, Updated) {
  for (auto tier : kAllTiers) {
    DestroyAndReopen(GetTestOptions());
@@ -221,11 +206,7 @@ TEST_F(DBBlobIndexTest, Updated) {
      ASSERT_EQ("blob_index", GetBlobIndex("key" + ToString(i), snapshot));
    }
    ASSERT_EQ("new_value", Get("key1"));
-    if (tier <= kImmutableMemtables) {
-      ASSERT_EQ("NOT_SUPPORTED", GetImpl("key2"));
-    } else {
-      ASSERT_EQ("CORRUPTION", GetImpl("key2"));
-    }
+    ASSERT_EQ("NOT_SUPPORTED", GetImpl("key2"));
    ASSERT_EQ("NOT_FOUND", Get("key3"));
    ASSERT_EQ("NOT_FOUND", Get("key4"));
    ASSERT_EQ("a,b,c", GetImpl("key5"));
@@ -237,11 +218,8 @@ TEST_F(DBBlobIndexTest, Updated) {
  }
 }

-// Note: the following test case pertains to the StackableDB-based BlobDB
-// implementation. When a blob iterator is used, it should set the
-// expose_blob_index flag for the underlying DBIter, and retrieve/return the
-// corresponding blob value. If a regular DBIter is created (i.e.
-// expose_blob_index is not set), it should return Status::Corruption.
+// Iterator should get blob value if allow_blob flag is set,
+// otherwise return Status::NotSupported status.
 TEST_F(DBBlobIndexTest, Iterate) {
  const std::vector<std::vector<ValueType>> data = {
      /*00*/ {kTypeValue},
@@ -304,7 +282,6 @@ TEST_F(DBBlobIndexTest, Iterate) {
                    std::function<void(Iterator*)> extra_check = nullptr) {
    // Seek
    auto* iterator = create_iterator();
-    ASSERT_OK(iterator->status());
    ASSERT_OK(iterator->Refresh());
    iterator->Seek(get_key(index));
    check_iterator(iterator, expected_status, forward_value);
@@ -318,7 +295,6 @@ TEST_F(DBBlobIndexTest, Iterate) {
    ASSERT_OK(iterator->Refresh());
    iterator->Seek(get_key(index - 1));
    ASSERT_TRUE(iterator->Valid());
-    ASSERT_OK(iterator->status());
    iterator->Next();
    check_iterator(iterator, expected_status, forward_value);
    if (extra_check) {
@@ -328,7 +304,6 @@ TEST_F(DBBlobIndexTest, Iterate) {

    // SeekForPrev
    iterator = create_iterator();
-    ASSERT_OK(iterator->status());
    ASSERT_OK(iterator->Refresh());
    iterator->SeekForPrev(get_key(index));
    check_iterator(iterator, expected_status, backward_value);
@@ -341,7 +316,6 @@ TEST_F(DBBlobIndexTest, Iterate) {
    iterator = create_iterator();
    iterator->Seek(get_key(index + 1));
    ASSERT_TRUE(iterator->Valid());
-    ASSERT_OK(iterator->status());
    iterator->Prev();
    check_iterator(iterator, expected_status, backward_value);
    if (extra_check) {
@@ -379,7 +353,7 @@ TEST_F(DBBlobIndexTest, Iterate) {
            ASSERT_OK(Write(&batch));
            break;
          default:
-            FAIL();
+            assert(false);
        };
      }
      snapshots.push_back(dbfull()->GetSnapshot());
@@ -390,15 +364,15 @@ TEST_F(DBBlobIndexTest, Iterate) {
    MoveDataTo(tier);

    // Normal iterator
-    verify(1, Status::kCorruption, "", "", create_normal_iterator);
-    verify(3, Status::kCorruption, "", "", create_normal_iterator);
+    verify(1, Status::kNotSupported, "", "", create_normal_iterator);
+    verify(3, Status::kNotSupported, "", "", create_normal_iterator);
    verify(5, Status::kOk, get_value(5, 0), get_value(5, 0),
           create_normal_iterator);
    verify(7, Status::kOk, get_value(8, 0), get_value(6, 0),
           create_normal_iterator);
    verify(9, Status::kOk, get_value(10, 0), get_value(8, 0),
           create_normal_iterator);
-    verify(11, Status::kCorruption, "", "", create_normal_iterator);
+    verify(11, Status::kNotSupported, "", "", create_normal_iterator);
    verify(13, Status::kOk,
           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
@@ -417,11 +391,7 @@ TEST_F(DBBlobIndexTest, Iterate) {
           create_blob_iterator, check_is_blob(false));
    verify(9, Status::kOk, get_value(10, 0), get_value(8, 0),
           create_blob_iterator, check_is_blob(false));
-    if (tier <= kImmutableMemtables) {
-      verify(11, Status::kNotSupported, "", "", create_blob_iterator);
-    } else {
-      verify(11, Status::kCorruption, "", "", create_blob_iterator);
-    }
+    verify(11, Status::kNotSupported, "", "", create_blob_iterator);
    verify(13, Status::kOk,
           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
@@ -443,11 +413,7 @@ TEST_F(DBBlobIndexTest, Iterate) {
           create_blob_iterator, check_is_blob(false));
    verify(9, Status::kOk, get_value(10, 0), get_value(8, 0),
           create_blob_iterator, check_is_blob(false));
-    if (tier <= kImmutableMemtables) {
-      verify(11, Status::kNotSupported, "", "", create_blob_iterator);
-    } else {
-      verify(11, Status::kCorruption, "", "", create_blob_iterator);
-    }
+    verify(11, Status::kNotSupported, "", "", create_blob_iterator);
    verify(13, Status::kOk,
           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
           get_value(13, 2) + "," + get_value(13, 1) + "," + get_value(13, 0),
@@ -462,111 +428,10 @@ TEST_F(DBBlobIndexTest, Iterate) {
  }
 }

-TEST_F(DBBlobIndexTest, IntegratedBlobIterate) {
-  const std::vector<std::vector<std::string>> data = {
-      /*00*/ {"Put"},
-      /*01*/ {"Put", "Merge", "Merge", "Merge"},
-      /*02*/ {"Put"}};
-
-  auto get_key = [](size_t index) { return ("key" + std::to_string(index)); };
-
-  auto get_value = [&](size_t index, size_t version) {
-    return get_key(index) + "_value" + ToString(version);
-  };
-
-  auto check_iterator = [&](Iterator* iterator, Status expected_status,
-                            const Slice& expected_value) {
-    ASSERT_EQ(expected_status, iterator->status());
-    if (expected_status.ok()) {
-      ASSERT_TRUE(iterator->Valid());
-      ASSERT_EQ(expected_value, iterator->value());
-    } else {
-      ASSERT_FALSE(iterator->Valid());
-    }
-  };
-
-  auto verify = [&](size_t index, Status expected_status,
-                    const Slice& expected_value) {
-    // Seek
-    {
-      Iterator* iterator = db_->NewIterator(ReadOptions());
-      std::unique_ptr<Iterator> iterator_guard(iterator);
-      ASSERT_OK(iterator->status());
-      ASSERT_OK(iterator->Refresh());
-      iterator->Seek(get_key(index));
-      check_iterator(iterator, expected_status, expected_value);
-    }
-    // Next
-    {
-      Iterator* iterator = db_->NewIterator(ReadOptions());
-      std::unique_ptr<Iterator> iterator_guard(iterator);
-      ASSERT_OK(iterator->Refresh());
-      iterator->Seek(get_key(index - 1));
-      ASSERT_TRUE(iterator->Valid());
-      ASSERT_OK(iterator->status());
-      iterator->Next();
-      check_iterator(iterator, expected_status, expected_value);
-    }
-    // SeekForPrev
-    {
-      Iterator* iterator = db_->NewIterator(ReadOptions());
-      std::unique_ptr<Iterator> iterator_guard(iterator);
-      ASSERT_OK(iterator->status());
-      ASSERT_OK(iterator->Refresh());
-      iterator->SeekForPrev(get_key(index));
-      check_iterator(iterator, expected_status, expected_value);
-    }
-    // Prev
-    {
-      Iterator* iterator = db_->NewIterator(ReadOptions());
-      std::unique_ptr<Iterator> iterator_guard(iterator);
-      iterator->Seek(get_key(index + 1));
-      ASSERT_TRUE(iterator->Valid());
-      ASSERT_OK(iterator->status());
-      iterator->Prev();
-      check_iterator(iterator, expected_status, expected_value);
-    }
-  };
-
-  Options options = GetTestOptions();
-  options.enable_blob_files = true;
-  options.min_blob_size = 0;
-
-  DestroyAndReopen(options);
-
-  // fill data
-  for (size_t i = 0; i < data.size(); i++) {
-    for (size_t j = 0; j < data[i].size(); j++) {
-      std::string key = get_key(i);
-      std::string value = get_value(i, j);
-      if (data[i][j] == "Put") {
-        ASSERT_OK(Put(key, value));
-        ASSERT_OK(Flush());
-      } else if (data[i][j] == "Merge") {
-        ASSERT_OK(Merge(key, value));
-        ASSERT_OK(Flush());
-      }
-    }
-  }
-
-  std::string expected_value = get_value(1, 0) + "," + get_value(1, 1) + "," +
-                               get_value(1, 2) + "," + get_value(1, 3);
-  Status expected_status;
-  verify(1, expected_status, expected_value);
-
-#ifndef ROCKSDB_LITE
-  // Test DBIter::FindValueForCurrentKeyUsingSeek flow.
-  ASSERT_OK(dbfull()->SetOptions(cfh(),
-                                 {{"max_sequential_skip_in_iterations", "0"}}));
-  verify(1, expected_status, expected_value);
-#endif  // !ROCKSDB_LITE
-}
-
 }  // namespace ROCKSDB_NAMESPACE

 int main(int argc, char** argv) {
  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
-  RegisterCustomObjects(argc, argv);
  return RUN_ALL_TESTS();
 }
@@ -1,21 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/blob/prefetch_buffer_collection.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-FilePrefetchBuffer* PrefetchBufferCollection::GetOrCreatePrefetchBuffer(
-    uint64_t file_number) {
-  auto& prefetch_buffer = prefetch_buffers_[file_number];
-  if (!prefetch_buffer) {
-    prefetch_buffer.reset(
-        new FilePrefetchBuffer(readahead_size_, readahead_size_));
-  }
-
-  return prefetch_buffer.get();
-}
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,38 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <cassert>
-#include <cstdint>
-#include <memory>
-#include <unordered_map>
-
-#include "file/file_prefetch_buffer.h"
-#include "rocksdb/rocksdb_namespace.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// A class that owns a collection of FilePrefetchBuffers using the file number
-// as key. Used for implementing compaction readahead for blob files. Designed
-// to be accessed by a single thread only: every (sub)compaction needs its own
-// buffers since they are guaranteed to read different blobs from different
-// positions even when reading the same file.
-class PrefetchBufferCollection {
- public:
-  explicit PrefetchBufferCollection(uint64_t readahead_size)
-      : readahead_size_(readahead_size) {
-    assert(readahead_size_ > 0);
-  }
-
-  FilePrefetchBuffer* GetOrCreatePrefetchBuffer(uint64_t file_number);
-
- private:
-  uint64_t readahead_size_;
-  std::unordered_map<uint64_t, std::unique_ptr<FilePrefetchBuffer>>
-      prefetch_buffers_;  // maps file number to prefetch buffer
-};
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -15,6 +15,7 @@

 #include "db/blob/blob_file_builder.h"
 #include "db/compaction/compaction_iterator.h"
+#include "db/dbformat.h"
 #include "db/event_helpers.h"
 #include "db/internal_stats.h"
 #include "db/merge_helper.h"
@@ -22,13 +23,11 @@
 #include "db/range_del_aggregator.h"
 #include "db/table_cache.h"
 #include "db/version_edit.h"
-#include "file/file_util.h"
 #include "file/filename.h"
 #include "file/read_write_util.h"
 #include "file/writable_file_writer.h"
 #include "monitoring/iostats_context_imp.h"
 #include "monitoring/thread_status_util.h"
-#include "options/options_helper.h"
 #include "rocksdb/db.h"
 #include "rocksdb/env.h"
 #include "rocksdb/iterator.h"
@@ -44,42 +43,62 @@ namespace ROCKSDB_NAMESPACE {

 class TableFactory;

-TableBuilder* NewTableBuilder(const TableBuilderOptions& tboptions,
-                              WritableFileWriter* file) {
-  assert((tboptions.column_family_id ==
+TableBuilder* NewTableBuilder(
+    const ImmutableCFOptions& ioptions, const MutableCFOptions& moptions,
+    const InternalKeyComparator& internal_comparator,
+    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+        int_tbl_prop_collector_factories,
+    uint32_t column_family_id, const std::string& column_family_name,
+    WritableFileWriter* file, const CompressionType compression_type,
+    uint64_t sample_for_compression, const CompressionOptions& compression_opts,
+    int level, const bool skip_filters, const uint64_t creation_time,
+    const uint64_t oldest_key_time, const uint64_t target_file_size,
+    const uint64_t file_creation_time, const std::string& db_id,
+    const std::string& db_session_id) {
+  assert((column_family_id ==
          TablePropertiesCollectorFactory::Context::kUnknownColumnFamily) ==
-         tboptions.column_family_name.empty());
-  return tboptions.ioptions.table_factory->NewTableBuilder(tboptions, file);
+         column_family_name.empty());
+  return ioptions.table_factory->NewTableBuilder(
+      TableBuilderOptions(ioptions, moptions, internal_comparator,
+                          int_tbl_prop_collector_factories, compression_type,
+                          sample_for_compression, compression_opts,
+                          skip_filters, column_family_name, level,
+                          creation_time, oldest_key_time, target_file_size,
+                          file_creation_time, db_id, db_session_id),
+      column_family_id, file);
 }

 Status BuildTable(
-    const std::string& dbname, VersionSet* versions,
-    const ImmutableDBOptions& db_options, const TableBuilderOptions& tboptions,
-    const FileOptions& file_options, TableCache* table_cache,
-    InternalIterator* iter,
+    const std::string& dbname, VersionSet* versions, Env* env, FileSystem* fs,
+    const ImmutableCFOptions& ioptions,
+    const MutableCFOptions& mutable_cf_options, const FileOptions& file_options,
+    TableCache* table_cache, InternalIterator* iter,
    std::vector<std::unique_ptr<FragmentedRangeTombstoneIterator>>
        range_del_iters,
    FileMetaData* meta, std::vector<BlobFileAddition>* blob_file_additions,
+    const InternalKeyComparator& internal_comparator,
+    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+        int_tbl_prop_collector_factories,
+    uint32_t column_family_id, const std::string& column_family_name,
    std::vector<SequenceNumber> snapshots,
    SequenceNumber earliest_write_conflict_snapshot,
-    SnapshotChecker* snapshot_checker, bool paranoid_file_checks,
-    InternalStats* internal_stats, IOStatus* io_status,
-    const std::shared_ptr<IOTracer>& io_tracer,
-    BlobFileCreationReason blob_creation_reason, EventLogger* event_logger,
+    SnapshotChecker* snapshot_checker, const CompressionType compression,
+    uint64_t sample_for_compression, const CompressionOptions& compression_opts,
+    bool paranoid_file_checks, InternalStats* internal_stats,
+    TableFileCreationReason reason, IOStatus* io_status,
+    const std::shared_ptr<IOTracer>& io_tracer, EventLogger* event_logger,
    int job_id, const Env::IOPriority io_priority,
-    TableProperties* table_properties, Env::WriteLifeTimeHint write_hint,
-    const std::string* full_history_ts_low,
-    BlobFileCompletionCallback* blob_callback, uint64_t* num_input_entries,
-    uint64_t* memtable_payload_bytes, uint64_t* memtable_garbage_bytes) {
-  assert((tboptions.column_family_id ==
+    TableProperties* table_properties, int level, const uint64_t creation_time,
+    const uint64_t oldest_key_time, Env::WriteLifeTimeHint write_hint,
+    const uint64_t file_creation_time, const std::string& db_id,
+    const std::string& db_session_id) {
+  assert((column_family_id ==
          TablePropertiesCollectorFactory::Context::kUnknownColumnFamily) ==
-         tboptions.column_family_name.empty());
-  auto& mutable_cf_options = tboptions.moptions;
-  auto& ioptions = tboptions.ioptions;
+         column_family_name.empty());
  // Reports the IOStats for flush for every following bytes.
  const size_t kReportFlushIOStatsEvery = 1048576;
  OutputValidator output_validator(
-      tboptions.internal_comparator,
+      internal_comparator,
      /*enable_order_check=*/
      mutable_cf_options.check_flush_compaction_key_order,
      /*enable_hash=*/paranoid_file_checks);
@@ -87,15 +106,8 @@ Status BuildTable(
  meta->fd.file_size = 0;
  iter->SeekToFirst();
  std::unique_ptr<CompactionRangeDelAggregator> range_del_agg(
-      new CompactionRangeDelAggregator(&tboptions.internal_comparator,
-                                       snapshots));
-  uint64_t num_unfragmented_tombstones = 0;
-  uint64_t total_tombstone_payload_bytes = 0;
+      new CompactionRangeDelAggregator(&internal_comparator, snapshots));
  for (auto& range_del_iter : range_del_iters) {
-    num_unfragmented_tombstones +=
-        range_del_iter->num_unfragmented_tombstones();
-    total_tombstone_payload_bytes +=
-        range_del_iter->total_tombstone_payload_bytes();
    range_del_agg->AddTombstones(std::move(range_del_iter));
  }

@@ -105,39 +117,18 @@ Status BuildTable(
  std::string file_checksum = kUnknownFileChecksum;
  std::string file_checksum_func_name = kUnknownFileChecksumFuncName;
 #ifndef ROCKSDB_LITE
-  EventHelpers::NotifyTableFileCreationStarted(ioptions.listeners, dbname,
-                                               tboptions.column_family_name,
-                                               fname, job_id, tboptions.reason);
+  EventHelpers::NotifyTableFileCreationStarted(
+      ioptions.listeners, dbname, column_family_name, fname, job_id, reason);
 #endif  // !ROCKSDB_LITE
-  Env* env = db_options.env;
-  assert(env);
-  FileSystem* fs = db_options.fs.get();
-  assert(fs);
-
  TableProperties tp;
  if (iter->Valid() || !range_del_agg->IsEmpty()) {
-    std::unique_ptr<CompactionFilter> compaction_filter;
-    if (ioptions.compaction_filter_factory != nullptr &&
-        ioptions.compaction_filter_factory->ShouldFilterTableFileCreation(
-            tboptions.reason)) {
-      CompactionFilter::Context context;
-      context.is_full_compaction = false;
-      context.is_manual_compaction = false;
-      context.column_family_id = tboptions.column_family_id;
-      context.reason = tboptions.reason;
-      compaction_filter =
-          ioptions.compaction_filter_factory->CreateCompactionFilter(context);
-      if (compaction_filter != nullptr &&
-          !compaction_filter->IgnoreSnapshots()) {
-        s.PermitUncheckedError();
-        return Status::NotSupported(
-            "CompactionFilter::IgnoreSnapshots() = false is not supported "
-            "anymore.");
-      }
-    }
-
    TableBuilder* builder;
    std::unique_ptr<WritableFileWriter> file_writer;
+    // Currently we only enable dictionary compression during compaction to the
+    // bottommost level.
+    CompressionOptions compression_opts_for_flush(compression_opts);
+    compression_opts_for_flush.max_dict_bytes = 0;
+    compression_opts_for_flush.zstd_max_train_bytes = 0;
    {
      std::unique_ptr<FSWritableFile> file;
 #ifndef NDEBUG
@@ -152,51 +143,49 @@ Status BuildTable(
      }
      if (!s.ok()) {
        EventHelpers::LogAndNotifyTableFileCreationFinished(
-            event_logger, ioptions.listeners, dbname,
-            tboptions.column_family_name, fname, job_id, meta->fd,
-            kInvalidBlobFileNumber, tp, tboptions.reason, s, file_checksum,
-            file_checksum_func_name);
+            event_logger, ioptions.listeners, dbname, column_family_name, fname,
+            job_id, meta->fd, kInvalidBlobFileNumber, tp, reason, s,
+            file_checksum, file_checksum_func_name);
        return s;
      }
-      FileTypeSet tmp_set = ioptions.checksum_handoff_file_types;
      file->SetIOPriority(io_priority);
      file->SetWriteLifeTimeHint(write_hint);
-      file_writer.reset(new WritableFileWriter(
-          std::move(file), fname, file_options, ioptions.clock, io_tracer,
-          ioptions.stats, ioptions.listeners,
-          ioptions.file_checksum_gen_factory.get(),
-          tmp_set.Contains(FileType::kTableFile), false));

-      builder = NewTableBuilder(tboptions, file_writer.get());
+      file_writer.reset(new WritableFileWriter(
+          std::move(file), fname, file_options, env, io_tracer,
+          ioptions.statistics, ioptions.listeners,
+          ioptions.file_checksum_gen_factory));
+
+      builder = NewTableBuilder(
+          ioptions, mutable_cf_options, internal_comparator,
+          int_tbl_prop_collector_factories, column_family_id,
+          column_family_name, file_writer.get(), compression,
+          sample_for_compression, compression_opts_for_flush, level,
+          false /* skip_filters */, creation_time, oldest_key_time,
+          0 /*target_file_size*/, file_creation_time, db_id, db_session_id);
    }

-    MergeHelper merge(
-        env, tboptions.internal_comparator.user_comparator(),
-        ioptions.merge_operator.get(), compaction_filter.get(), ioptions.logger,
-        true /* internal key corruption is not ok */,
-        snapshots.empty() ? 0 : snapshots.back(), snapshot_checker);
+    MergeHelper merge(env, internal_comparator.user_comparator(),
+                      ioptions.merge_operator, nullptr, ioptions.info_log,
+                      true /* internal key corruption is not ok */,
+                      snapshots.empty() ? 0 : snapshots.back(),
+                      snapshot_checker);

    std::unique_ptr<BlobFileBuilder> blob_file_builder(
        (mutable_cf_options.enable_blob_files && blob_file_additions)
-            ? new BlobFileBuilder(
-                  versions, fs, &ioptions, &mutable_cf_options, &file_options,
-                  job_id, tboptions.column_family_id,
-                  tboptions.column_family_name, io_priority, write_hint,
-                  io_tracer, blob_callback, blob_creation_reason,
-                  &blob_file_paths, blob_file_additions)
+            ? new BlobFileBuilder(versions, env, fs, &ioptions,
+                                  &mutable_cf_options, &file_options, job_id,
+                                  column_family_id, column_family_name,
+                                  io_priority, write_hint, &blob_file_paths,
+                                  blob_file_additions)
            : nullptr);

    CompactionIterator c_iter(
-        iter, tboptions.internal_comparator.user_comparator(), &merge,
-        kMaxSequenceNumber, &snapshots, earliest_write_conflict_snapshot,
-        snapshot_checker, env, ShouldReportDetailedTime(env, ioptions.stats),
+        iter, internal_comparator.user_comparator(), &merge, kMaxSequenceNumber,
+        &snapshots, earliest_write_conflict_snapshot, snapshot_checker, env,
+        ShouldReportDetailedTime(env, ioptions.statistics),
        true /* internal key corruption is not ok */, range_del_agg.get(),
-        blob_file_builder.get(), ioptions.allow_data_in_errors,
-        /*compaction=*/nullptr, compaction_filter.get(),
-        /*shutting_down=*/nullptr,
-        /*preserve_deletes_seqnum=*/0, /*manual_compaction_paused=*/nullptr,
-        /*manual_compaction_canceled=*/nullptr, db_options.info_log,
-        full_history_ts_low);
+        blob_file_builder.get(), ioptions.allow_data_in_errors);

    c_iter.SeekToFirst();
    for (; c_iter.Valid(); c_iter.Next()) {
@@ -204,8 +193,6 @@ Status BuildTable(
      const Slice& value = c_iter.value();
      const ParsedInternalKey& ikey = c_iter.ikey();
      // Generate a rolling 64-bit hash of the key and values
-      // Note :
-      // Here "key" integrates 'sequence_number'+'kType'+'user key'.
      s = output_validator.Add(key, value);
      if (!s.ok()) {
        break;
@@ -225,7 +212,6 @@ Status BuildTable(
    } else if (!c_iter.status().ok()) {
      s = c_iter.status();
    }
-
    if (s.ok()) {
      auto range_del_it = range_del_agg->NewIterator();
      for (range_del_it->SeekToFirst(); range_del_it->Valid();
@@ -234,17 +220,16 @@ Status BuildTable(
        auto kv = tombstone.Serialize();
        builder->Add(kv.first.Encode(), kv.second);
        meta->UpdateBoundariesForRange(kv.first, tombstone.SerializeEndKey(),
-                                       tombstone.seq_,
-                                       tboptions.internal_comparator);
+                                       tombstone.seq_, internal_comparator);
+      }
+
+      if (blob_file_builder) {
+        s = blob_file_builder->Finish();
      }
    }

    TEST_SYNC_POINT("BuildTable:BeforeFinishBuildTable");
    const bool empty = builder->IsEmpty();
-    if (num_input_entries != nullptr) {
-      *num_input_entries =
-          c_iter.num_input_entry_scanned() + num_unfragmented_tombstones;
-    }
    if (!s.ok() || empty) {
      builder->Abandon();
    } else {
@@ -260,25 +245,6 @@ Status BuildTable(
      meta->marked_for_compaction = builder->NeedCompact();
      assert(meta->fd.GetFileSize() > 0);
      tp = builder->GetTableProperties(); // refresh now that builder is finished
-      if (memtable_payload_bytes != nullptr &&
-          memtable_garbage_bytes != nullptr) {
-        const CompactionIterationStats& ci_stats = c_iter.iter_stats();
-        uint64_t total_payload_bytes = ci_stats.total_input_raw_key_bytes +
-                                       ci_stats.total_input_raw_value_bytes +
-                                       total_tombstone_payload_bytes;
-        uint64_t total_payload_bytes_written =
-            (tp.raw_key_size + tp.raw_value_size);
-        // Prevent underflow, which may still happen at this point
-        // since we only support inserts, deletes, and deleteRanges.
-        if (total_payload_bytes_written <= total_payload_bytes) {
-          *memtable_payload_bytes = total_payload_bytes;
-          *memtable_garbage_bytes =
-              total_payload_bytes - total_payload_bytes_written;
-        } else {
-          *memtable_payload_bytes = 0;
-          *memtable_garbage_bytes = 0;
-        }
-      }
      if (table_properties) {
        *table_properties = tp;
      }
@@ -288,7 +254,7 @@ Status BuildTable(
    // Finish and check for file errors
    TEST_SYNC_POINT("BuildTable:BeforeSyncTable");
    if (s.ok() && !empty) {
-      StopWatch sw(ioptions.clock, ioptions.stats, TABLE_SYNC_MICROS);
+      StopWatch sw(env, ioptions.statistics, TABLE_SYNC_MICROS);
      *io_status = file_writer->Sync(ioptions.use_fsync);
    }
    TEST_SYNC_POINT("BuildTable:BeforeCloseTableFile");
@@ -307,15 +273,6 @@ Status BuildTable(
      s = *io_status;
    }

-    if (blob_file_builder) {
-      if (s.ok()) {
-        s = blob_file_builder->Finish();
-      } else {
-        blob_file_builder->Abandon(s);
-      }
-      blob_file_builder.reset();
-    }
-
    // TODO Also check the IO status when create the Iterator.

    if (s.ok() && !empty) {
@@ -327,20 +284,20 @@ Status BuildTable(
      // to cache it here for further user reads
      ReadOptions read_options;
      std::unique_ptr<InternalIterator> it(table_cache->NewIterator(
-          read_options, file_options, tboptions.internal_comparator, *meta,
+          read_options, file_options, internal_comparator, *meta,
          nullptr /* range_del_agg */,
          mutable_cf_options.prefix_extractor.get(), nullptr,
          (internal_stats == nullptr) ? nullptr
                                      : internal_stats->GetFileReadHist(0),
          TableReaderCaller::kFlush, /*arena=*/nullptr,
-          /*skip_filter=*/false, tboptions.level_at_creation,
+          /*skip_filter=*/false, level,
          MaxFileSizeForL0MetaPin(mutable_cf_options),
          /*smallest_compaction_key=*/nullptr,
          /*largest_compaction_key*/ nullptr,
          /*allow_unprepared_value*/ false));
      s = it->status();
      if (s.ok() && paranoid_file_checks) {
-        OutputValidator file_validator(tboptions.internal_comparator,
+        OutputValidator file_validator(internal_comparator,
                                       /*enable_order_check=*/true,
                                       /*enable_hash=*/true);
        for (it->SeekToFirst(); it->Valid(); it->Next()) {
@@ -361,8 +318,6 @@ Status BuildTable(
  }

  if (!s.ok() || meta->fd.GetFileSize() == 0) {
-    TEST_SYNC_POINT("BuildTable:BeforeDeleteFile");
-
    constexpr IODebugContext* dbg = nullptr;

    Status ignored = fs->DeleteFile(fname, IOOptions(), dbg);
@@ -372,27 +327,22 @@ Status BuildTable(

    if (blob_file_additions) {
      for (const std::string& blob_file_path : blob_file_paths) {
-        ignored = DeleteDBFile(&db_options, blob_file_path, dbname,
-                               /*force_bg=*/false, /*force_fg=*/false);
+        ignored = fs->DeleteFile(blob_file_path, IOOptions(), dbg);
        ignored.PermitUncheckedError();
-        TEST_SYNC_POINT("BuildTable::AfterDeleteFile");
      }
+
+      blob_file_additions->clear();
    }
  }

-  Status status_for_listener = s;
  if (meta->fd.GetFileSize() == 0) {
    fname = "(nil)";
-    if (s.ok()) {
-      status_for_listener = Status::Aborted("Empty SST file not kept");
-    }
  }
  // Output to event logger and fire events.
  EventHelpers::LogAndNotifyTableFileCreationFinished(
-      event_logger, ioptions.listeners, dbname, tboptions.column_family_name,
-      fname, job_id, meta->fd, meta->oldest_blob_file_number, tp,
-      tboptions.reason, status_for_listener, file_checksum,
-      file_checksum_func_name);
+      event_logger, ioptions.listeners, dbname, column_family_name, fname,
+      job_id, meta->fd, meta->oldest_blob_file_number, tp, reason, s,
+      file_checksum, file_checksum_func_name);

  return s;
 }
@@ -24,20 +24,37 @@

 namespace ROCKSDB_NAMESPACE {

+struct Options;
 struct FileMetaData;

 class VersionSet;
+class Env;
+struct EnvOptions;
 class BlobFileAddition;
+class Iterator;
 class SnapshotChecker;
 class TableCache;
+class VersionEdit;
 class TableBuilder;
 class WritableFileWriter;
 class InternalStats;
-class BlobFileCompletionCallback;

-// Convenience function for NewTableBuilder on the embedded table_factory.
-TableBuilder* NewTableBuilder(const TableBuilderOptions& tboptions,
-                              WritableFileWriter* file);
+// @param column_family_name Name of the column family that is also identified
+//    by column_family_id, or empty string if unknown. It must outlive the
+//    TableBuilder returned by this function.
+TableBuilder* NewTableBuilder(
+    const ImmutableCFOptions& options, const MutableCFOptions& moptions,
+    const InternalKeyComparator& internal_comparator,
+    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+        int_tbl_prop_collector_factories,
+    uint32_t column_family_id, const std::string& column_family_name,
+    WritableFileWriter* file, const CompressionType compression_type,
+    const uint64_t sample_for_compression,
+    const CompressionOptions& compression_opts, int level,
+    const bool skip_filters = false, const uint64_t creation_time = 0,
+    const uint64_t oldest_key_time = 0, const uint64_t target_file_size = 0,
+    const uint64_t file_creation_time = 0, const std::string& db_id = "",
+    const std::string& db_session_id = "");

 // Build a Table file from the contents of *iter.  The generated file
 // will be named according to number specified in meta. On success, the rest of
@@ -48,27 +65,30 @@ TableBuilder* NewTableBuilder(const TableBuilderOptions& tboptions,
 // @param column_family_name Name of the column family that is also identified
 //    by column_family_id, or empty string if unknown.
 extern Status BuildTable(
-    const std::string& dbname, VersionSet* versions,
-    const ImmutableDBOptions& db_options, const TableBuilderOptions& tboptions,
-    const FileOptions& file_options, TableCache* table_cache,
-    InternalIterator* iter,
+    const std::string& dbname, VersionSet* versions, Env* env, FileSystem* fs,
+    const ImmutableCFOptions& options,
+    const MutableCFOptions& mutable_cf_options, const FileOptions& file_options,
+    TableCache* table_cache, InternalIterator* iter,
    std::vector<std::unique_ptr<FragmentedRangeTombstoneIterator>>
        range_del_iters,
    FileMetaData* meta, std::vector<BlobFileAddition>* blob_file_additions,
+    const InternalKeyComparator& internal_comparator,
+    const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+        int_tbl_prop_collector_factories,
+    uint32_t column_family_id, const std::string& column_family_name,
    std::vector<SequenceNumber> snapshots,
    SequenceNumber earliest_write_conflict_snapshot,
-    SnapshotChecker* snapshot_checker, bool paranoid_file_checks,
-    InternalStats* internal_stats, IOStatus* io_status,
-    const std::shared_ptr<IOTracer>& io_tracer,
-    BlobFileCreationReason blob_creation_reason,
+    SnapshotChecker* snapshot_checker, const CompressionType compression,
+    const uint64_t sample_for_compression,
+    const CompressionOptions& compression_opts, bool paranoid_file_checks,
+    InternalStats* internal_stats, TableFileCreationReason reason,
+    IOStatus* io_status, const std::shared_ptr<IOTracer>& io_tracer,
    EventLogger* event_logger = nullptr, int job_id = 0,
    const Env::IOPriority io_priority = Env::IO_HIGH,
-    TableProperties* table_properties = nullptr,
+    TableProperties* table_properties = nullptr, int level = -1,
+    const uint64_t creation_time = 0, const uint64_t oldest_key_time = 0,
    Env::WriteLifeTimeHint write_hint = Env::WLTH_NOT_SET,
-    const std::string* full_history_ts_low = nullptr,
-    BlobFileCompletionCallback* blob_callback = nullptr,
-    uint64_t* num_input_entries = nullptr,
-    uint64_t* memtable_payload_bytes = nullptr,
-    uint64_t* memtable_garbage_bytes = nullptr);
+    const uint64_t file_creation_time = 0, const std::string& db_id = "",
+    const std::string& db_session_id = "");

 }  // namespace ROCKSDB_NAMESPACE
@@ -11,11 +11,7 @@

 #include "rocksdb/c.h"

-#include <cstdlib>
-#include <map>
-#include <unordered_set>
-#include <vector>
-
+#include <stdlib.h>
 #include "port/port.h"
 #include "rocksdb/cache.h"
 #include "rocksdb/compaction_filter.h"
@@ -28,7 +24,6 @@
 #include "rocksdb/memtablerep.h"
 #include "rocksdb/merge_operator.h"
 #include "rocksdb/options.h"
-#include "rocksdb/perf_context.h"
 #include "rocksdb/rate_limiter.h"
 #include "rocksdb/slice_transform.h"
 #include "rocksdb/statistics.h"
@@ -40,13 +35,17 @@
 #include "rocksdb/utilities/db_ttl.h"
 #include "rocksdb/utilities/memory_util.h"
 #include "rocksdb/utilities/optimistic_transaction_db.h"
-#include "rocksdb/utilities/table_properties_collectors.h"
 #include "rocksdb/utilities/transaction.h"
 #include "rocksdb/utilities/transaction_db.h"
 #include "rocksdb/utilities/write_batch_with_index.h"
 #include "rocksdb/write_batch.h"
+#include "rocksdb/perf_context.h"
 #include "utilities/merge_operators.h"

+#include <vector>
+#include <unordered_set>
+#include <map>
+
 using ROCKSDB_NAMESPACE::BackupableDBOptions;
 using ROCKSDB_NAMESPACE::BackupEngine;
 using ROCKSDB_NAMESPACE::BackupID;
@@ -61,6 +60,7 @@ using ROCKSDB_NAMESPACE::ColumnFamilyDescriptor;
 using ROCKSDB_NAMESPACE::ColumnFamilyHandle;
 using ROCKSDB_NAMESPACE::ColumnFamilyOptions;
 using ROCKSDB_NAMESPACE::CompactionFilter;
+using ROCKSDB_NAMESPACE::CompactionFilterContext;
 using ROCKSDB_NAMESPACE::CompactionFilterFactory;
 using ROCKSDB_NAMESPACE::CompactionOptionsFIFO;
 using ROCKSDB_NAMESPACE::CompactRangeOptions;
@@ -80,15 +80,12 @@ using ROCKSDB_NAMESPACE::IngestExternalFileOptions;
 using ROCKSDB_NAMESPACE::Iterator;
 using ROCKSDB_NAMESPACE::LiveFileMetaData;
 using ROCKSDB_NAMESPACE::Logger;
-using ROCKSDB_NAMESPACE::LRUCacheOptions;
-using ROCKSDB_NAMESPACE::MemoryAllocator;
 using ROCKSDB_NAMESPACE::MemoryUtil;
 using ROCKSDB_NAMESPACE::MergeOperator;
+using ROCKSDB_NAMESPACE::MergeOperators;
 using ROCKSDB_NAMESPACE::NewBloomFilterPolicy;
-using ROCKSDB_NAMESPACE::NewCompactOnDeletionCollectorFactory;
 using ROCKSDB_NAMESPACE::NewGenericRateLimiter;
 using ROCKSDB_NAMESPACE::NewLRUCache;
-using ROCKSDB_NAMESPACE::NewRibbonFilterPolicy;
 using ROCKSDB_NAMESPACE::OptimisticTransactionDB;
 using ROCKSDB_NAMESPACE::OptimisticTransactionOptions;
 using ROCKSDB_NAMESPACE::Options;
@@ -107,7 +104,6 @@ using ROCKSDB_NAMESPACE::SliceTransform;
 using ROCKSDB_NAMESPACE::Snapshot;
 using ROCKSDB_NAMESPACE::SstFileWriter;
 using ROCKSDB_NAMESPACE::Status;
-using ROCKSDB_NAMESPACE::TablePropertiesCollectorFactory;
 using ROCKSDB_NAMESPACE::Transaction;
 using ROCKSDB_NAMESPACE::TransactionDB;
 using ROCKSDB_NAMESPACE::TransactionDBOptions;
@@ -119,8 +115,10 @@ using ROCKSDB_NAMESPACE::WriteBatch;
 using ROCKSDB_NAMESPACE::WriteBatchWithIndex;
 using ROCKSDB_NAMESPACE::WriteOptions;

+using std::shared_ptr;
 using std::vector;
 using std::unordered_set;
+using std::map;

 extern "C" {

@@ -156,12 +154,6 @@ struct rocksdb_filelock_t        { FileLock*         rep; };
 struct rocksdb_logger_t {
  std::shared_ptr<Logger> rep;
 };
-struct rocksdb_lru_cache_options_t {
-  LRUCacheOptions rep;
-};
-struct rocksdb_memory_allocator_t {
-  std::shared_ptr<MemoryAllocator> rep;
-};
 struct rocksdb_cache_t {
  std::shared_ptr<Cache> rep;
 };
@@ -189,9 +181,6 @@ struct rocksdb_transaction_options_t {
 struct rocksdb_transaction_t {
  Transaction* rep;
 };
-struct rocksdb_backupable_db_options_t {
-  BackupableDBOptions rep;
-};
 struct rocksdb_checkpoint_t {
  Checkpoint* rep;
 };
@@ -560,18 +549,6 @@ rocksdb_backup_engine_t* rocksdb_backup_engine_open(
  return result;
 }

-rocksdb_backup_engine_t* rocksdb_backup_engine_open_opts(
-    const rocksdb_backupable_db_options_t* options, rocksdb_env_t* env,
-    char** errptr) {
-  BackupEngine* be;
-  if (SaveError(errptr, BackupEngine::Open(options->rep, env->rep, &be))) {
-    return nullptr;
-  }
-  rocksdb_backup_engine_t* result = new rocksdb_backup_engine_t;
-  result->rep = be;
-  return result;
-}
-
 void rocksdb_backup_engine_create_new_backup(rocksdb_backup_engine_t* be,
                                             rocksdb_t* db,
                                             char** errptr) {
@@ -668,128 +645,6 @@ void rocksdb_backup_engine_close(rocksdb_backup_engine_t* be) {
  delete be;
 }

-rocksdb_backupable_db_options_t* rocksdb_backupable_db_options_create(
-    const char* backup_dir) {
-  return new rocksdb_backupable_db_options_t{
-      BackupableDBOptions(std::string(backup_dir))};
-}
-
-void rocksdb_backupable_db_options_set_backup_dir(
-    rocksdb_backupable_db_options_t* options, const char* backup_dir) {
-  options->rep.backup_dir = std::string(backup_dir);
-}
-
-void rocksdb_backupable_db_options_set_env(
-    rocksdb_backupable_db_options_t* options, rocksdb_env_t* env) {
-  options->rep.backup_env = (env ? env->rep : nullptr);
-}
-
-void rocksdb_backupable_db_options_set_share_table_files(
-    rocksdb_backupable_db_options_t* options, unsigned char val) {
-  options->rep.share_table_files = val;
-}
-
-unsigned char rocksdb_backupable_db_options_get_share_table_files(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.share_table_files;
-}
-
-void rocksdb_backupable_db_options_set_sync(
-    rocksdb_backupable_db_options_t* options, unsigned char val) {
-  options->rep.sync = val;
-}
-
-unsigned char rocksdb_backupable_db_options_get_sync(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.sync;
-}
-
-void rocksdb_backupable_db_options_set_destroy_old_data(
-    rocksdb_backupable_db_options_t* options, unsigned char val) {
-  options->rep.destroy_old_data = val;
-}
-
-unsigned char rocksdb_backupable_db_options_get_destroy_old_data(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.destroy_old_data;
-}
-
-void rocksdb_backupable_db_options_set_backup_log_files(
-    rocksdb_backupable_db_options_t* options, unsigned char val) {
-  options->rep.backup_log_files = val;
-}
-
-unsigned char rocksdb_backupable_db_options_get_backup_log_files(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.backup_log_files;
-}
-
-void rocksdb_backupable_db_options_set_backup_rate_limit(
-    rocksdb_backupable_db_options_t* options, uint64_t limit) {
-  options->rep.backup_rate_limit = limit;
-}
-
-uint64_t rocksdb_backupable_db_options_get_backup_rate_limit(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.backup_rate_limit;
-}
-
-void rocksdb_backupable_db_options_set_restore_rate_limit(
-    rocksdb_backupable_db_options_t* options, uint64_t limit) {
-  options->rep.restore_rate_limit = limit;
-}
-
-uint64_t rocksdb_backupable_db_options_get_restore_rate_limit(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.restore_rate_limit;
-}
-
-void rocksdb_backupable_db_options_set_max_background_operations(
-    rocksdb_backupable_db_options_t* options, int val) {
-  options->rep.max_background_operations = val;
-}
-
-int rocksdb_backupable_db_options_get_max_background_operations(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.max_background_operations;
-}
-
-void rocksdb_backupable_db_options_set_callback_trigger_interval_size(
-    rocksdb_backupable_db_options_t* options, uint64_t size) {
-  options->rep.callback_trigger_interval_size = size;
-}
-
-uint64_t rocksdb_backupable_db_options_get_callback_trigger_interval_size(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.callback_trigger_interval_size;
-}
-
-void rocksdb_backupable_db_options_set_max_valid_backups_to_open(
-    rocksdb_backupable_db_options_t* options, int val) {
-  options->rep.max_valid_backups_to_open = val;
-}
-
-int rocksdb_backupable_db_options_get_max_valid_backups_to_open(
-    rocksdb_backupable_db_options_t* options) {
-  return options->rep.max_valid_backups_to_open;
-}
-
-void rocksdb_backupable_db_options_set_share_files_with_checksum_naming(
-    rocksdb_backupable_db_options_t* options, int val) {
-  options->rep.share_files_with_checksum_naming =
-      static_cast<BackupableDBOptions::ShareFilesNaming>(val);
-}
-
-int rocksdb_backupable_db_options_get_share_files_with_checksum_naming(
-    rocksdb_backupable_db_options_t* options) {
-  return static_cast<int>(options->rep.share_files_with_checksum_naming);
-}
-
-void rocksdb_backupable_db_options_destroy(
-    rocksdb_backupable_db_options_t* options) {
-  delete options;
-}
-
 rocksdb_checkpoint_t* rocksdb_checkpoint_object_create(rocksdb_t* db,
                                                       char** errptr) {
  Checkpoint* checkpoint;
@@ -1400,39 +1255,34 @@ char* rocksdb_property_value_cf(
  }
 }

-void rocksdb_approximate_sizes(rocksdb_t* db, int num_ranges,
-                               const char* const* range_start_key,
-                               const size_t* range_start_key_len,
-                               const char* const* range_limit_key,
-                               const size_t* range_limit_key_len,
-                               uint64_t* sizes, char** errptr) {
+void rocksdb_approximate_sizes(
+    rocksdb_t* db,
+    int num_ranges,
+    const char* const* range_start_key, const size_t* range_start_key_len,
+    const char* const* range_limit_key, const size_t* range_limit_key_len,
+    uint64_t* sizes) {
  Range* ranges = new Range[num_ranges];
  for (int i = 0; i < num_ranges; i++) {
    ranges[i].start = Slice(range_start_key[i], range_start_key_len[i]);
    ranges[i].limit = Slice(range_limit_key[i], range_limit_key_len[i]);
  }
-  Status s = db->rep->GetApproximateSizes(ranges, num_ranges, sizes);
-  if (!s.ok()) {
-    SaveError(errptr, s);
-  }
+  db->rep->GetApproximateSizes(ranges, num_ranges, sizes);
  delete[] ranges;
 }

 void rocksdb_approximate_sizes_cf(
-    rocksdb_t* db, rocksdb_column_family_handle_t* column_family,
-    int num_ranges, const char* const* range_start_key,
-    const size_t* range_start_key_len, const char* const* range_limit_key,
-    const size_t* range_limit_key_len, uint64_t* sizes, char** errptr) {
+    rocksdb_t* db,
+    rocksdb_column_family_handle_t* column_family,
+    int num_ranges,
+    const char* const* range_start_key, const size_t* range_start_key_len,
+    const char* const* range_limit_key, const size_t* range_limit_key_len,
+    uint64_t* sizes) {
  Range* ranges = new Range[num_ranges];
  for (int i = 0; i < num_ranges; i++) {
    ranges[i].start = Slice(range_start_key[i], range_start_key_len[i]);
    ranges[i].limit = Slice(range_limit_key[i], range_limit_key_len[i]);
  }
-  Status s = db->rep->GetApproximateSizes(column_family->rep, ranges,
-                                          num_ranges, sizes);
-  if (!s.ok()) {
-    SaveError(errptr, s);
-  }
+  db->rep->GetApproximateSizes(column_family->rep, ranges, num_ranges, sizes);
  delete[] ranges;
 }

@@ -1513,10 +1363,6 @@ void rocksdb_flush_cf(
  SaveError(errptr, db->rep->Flush(options->rep, column_family->rep));
 }

-void rocksdb_flush_wal(rocksdb_t* db, unsigned char sync, char** errptr) {
-  SaveError(errptr, db->rep->FlushWAL(sync));
-}
-
 void rocksdb_disable_file_deletions(
    rocksdb_t* db,
    char** errptr) {
@@ -2698,78 +2544,6 @@ unsigned char rocksdb_options_get_skip_checking_sst_file_sizes_on_db_open(
  return opt->rep.skip_checking_sst_file_sizes_on_db_open;
 }

-/* Blob Options Settings */
-void rocksdb_options_set_enable_blob_files(rocksdb_options_t* opt,
-                                           unsigned char val) {
-  opt->rep.enable_blob_files = val;
-}
-extern ROCKSDB_LIBRARY_API unsigned char rocksdb_options_get_enable_blob_files(
-    rocksdb_options_t* opt) {
-  return opt->rep.enable_blob_files;
-}
-
-void rocksdb_options_set_min_blob_size(rocksdb_options_t* opt, uint64_t val) {
-  opt->rep.min_blob_size = val;
-}
-
-uint64_t rocksdb_options_get_min_blob_size(rocksdb_options_t* opt) {
-  return opt->rep.min_blob_size;
-}
-
-void rocksdb_options_set_blob_file_size(rocksdb_options_t* opt, uint64_t val) {
-  opt->rep.blob_file_size = val;
-}
-
-uint64_t rocksdb_options_get_blob_file_size(rocksdb_options_t* opt) {
-  return opt->rep.blob_file_size;
-}
-
-void rocksdb_options_set_blob_compression_type(rocksdb_options_t* opt,
-                                               int val) {
-  opt->rep.blob_compression_type = static_cast<CompressionType>(val);
-}
-
-int rocksdb_options_get_blob_compression_type(rocksdb_options_t* opt) {
-  return opt->rep.blob_compression_type;
-}
-
-void rocksdb_options_set_enable_blob_gc(rocksdb_options_t* opt,
-                                        unsigned char val) {
-  opt->rep.enable_blob_garbage_collection = val;
-}
-
-unsigned char rocksdb_options_get_enable_blob_gc(rocksdb_options_t* opt) {
-  return opt->rep.enable_blob_garbage_collection;
-}
-
-void rocksdb_options_set_blob_gc_age_cutoff(rocksdb_options_t* opt,
-                                            double val) {
-  opt->rep.blob_garbage_collection_age_cutoff = val;
-}
-
-double rocksdb_options_get_blob_gc_age_cutoff(rocksdb_options_t* opt) {
-  return opt->rep.blob_garbage_collection_age_cutoff;
-}
-
-void rocksdb_options_set_blob_gc_force_threshold(rocksdb_options_t* opt,
-                                                 double val) {
-  opt->rep.blob_garbage_collection_force_threshold = val;
-}
-
-double rocksdb_options_get_blob_gc_force_threshold(rocksdb_options_t* opt) {
-  return opt->rep.blob_garbage_collection_force_threshold;
-}
-
-void rocksdb_options_set_blob_compaction_readahead_size(rocksdb_options_t* opt,
-                                                        uint64_t val) {
-  opt->rep.blob_compaction_readahead_size = val;
-}
-
-uint64_t rocksdb_options_get_blob_compaction_readahead_size(
-    rocksdb_options_t* opt) {
-  return opt->rep.blob_compaction_readahead_size;
-}
-
 void rocksdb_options_set_num_levels(rocksdb_options_t* opt, int n) {
  opt->rep.num_levels = n;
 }
@@ -2862,14 +2636,6 @@ void rocksdb_options_set_bottommost_compression_options_zstd_max_train_bytes(
  opt->rep.bottommost_compression_opts.enabled = enabled;
 }

-void rocksdb_options_set_bottommost_compression_options_max_dict_buffer_bytes(
-    rocksdb_options_t* opt, uint64_t max_dict_buffer_bytes,
-    unsigned char enabled) {
-  opt->rep.bottommost_compression_opts.max_dict_buffer_bytes =
-      max_dict_buffer_bytes;
-  opt->rep.bottommost_compression_opts.enabled = enabled;
-}
-
 void rocksdb_options_set_compression_options(rocksdb_options_t* opt, int w_bits,
                                             int level, int strategy,
                                             int max_dict_bytes) {
@@ -2884,31 +2650,6 @@ void rocksdb_options_set_compression_options_zstd_max_train_bytes(
  opt->rep.compression_opts.zstd_max_train_bytes = zstd_max_train_bytes;
 }

-int rocksdb_options_get_compression_options_zstd_max_train_bytes(
-    rocksdb_options_t* opt) {
-  return opt->rep.compression_opts.zstd_max_train_bytes;
-}
-
-void rocksdb_options_set_compression_options_parallel_threads(
-    rocksdb_options_t* opt, int value) {
-  opt->rep.compression_opts.parallel_threads = value;
-}
-
-int rocksdb_options_get_compression_options_parallel_threads(
-    rocksdb_options_t* opt) {
-  return opt->rep.compression_opts.parallel_threads;
-}
-
-void rocksdb_options_set_compression_options_max_dict_buffer_bytes(
-    rocksdb_options_t* opt, uint64_t max_dict_buffer_bytes) {
-  opt->rep.compression_opts.max_dict_buffer_bytes = max_dict_buffer_bytes;
-}
-
-uint64_t rocksdb_options_get_compression_options_max_dict_buffer_bytes(
-    rocksdb_options_t* opt) {
-  return opt->rep.compression_opts.max_dict_buffer_bytes;
-}
-
 void rocksdb_options_set_prefix_extractor(
    rocksdb_options_t* opt, rocksdb_slicetransform_t* prefix_extractor) {
  opt->rep.prefix_extractor.reset(prefix_extractor);
@@ -3048,11 +2789,6 @@ unsigned char rocksdb_options_get_advise_random_on_open(
  return opt->rep.advise_random_on_open;
 }

-void rocksdb_options_set_experimental_mempurge_threshold(rocksdb_options_t* opt,
-                                                         double v) {
-  opt->rep.experimental_mempurge_threshold = v;
-}
-
 void rocksdb_options_set_access_hint_on_compaction_start(
    rocksdb_options_t* opt, int v) {
  switch(v) {
@@ -3072,8 +2808,6 @@ void rocksdb_options_set_access_hint_on_compaction_start(
      opt->rep.access_hint_on_compaction_start =
          ROCKSDB_NAMESPACE::Options::WILLNEED;
      break;
-    default:
-      assert(0);
  }
 }

@@ -3528,15 +3262,6 @@ unsigned char rocksdb_options_get_atomic_flush(rocksdb_options_t* opt) {
  return opt->rep.atomic_flush;
 }

-void rocksdb_options_set_manual_wal_flush(rocksdb_options_t* opt,
-                                          unsigned char manual_wal_flush) {
-  opt->rep.manual_wal_flush = manual_wal_flush;
-}
-
-unsigned char rocksdb_options_get_manual_wal_flush(rocksdb_options_t* opt) {
-  return opt->rep.manual_wal_flush;
-}
-
 rocksdb_ratelimiter_t* rocksdb_ratelimiter_create(
    int64_t rate_bytes_per_sec,
    int64_t refill_period_us,
@@ -3558,14 +3283,6 @@ void rocksdb_options_set_row_cache(rocksdb_options_t* opt, rocksdb_cache_t* cach
  }
 }

-void rocksdb_options_add_compact_on_deletion_collector_factory(
-    rocksdb_options_t* opt, size_t window_size, size_t num_dels_trigger) {
-  std::shared_ptr<ROCKSDB_NAMESPACE::TablePropertiesCollectorFactory>
-      compact_on_del =
-          NewCompactOnDeletionCollectorFactory(window_size, num_dels_trigger);
-  opt->rep.table_properties_collector_factories.emplace_back(compact_on_del);
-}
-
 void rocksdb_set_perf_level(int v) {
  PerfLevel level = static_cast<PerfLevel>(v);
  SetPerfLevel(level);
@@ -3859,8 +3576,7 @@ void rocksdb_filterpolicy_destroy(rocksdb_filterpolicy_t* filter) {
  delete filter;
 }

-rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom_format(
-    double bits_per_key, bool original_format) {
+rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom_format(int bits_per_key, bool original_format) {
  // Make a rocksdb_filterpolicy_t, but override all of its methods so
  // they delegate to a NewBloomFilterPolicy() instead of user
  // supplied C functions.
@@ -3895,63 +3611,14 @@ rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom_format(
  return wrapper;
 }

-rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom_full(
-    double bits_per_key) {
+rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom_full(int bits_per_key) {
  return rocksdb_filterpolicy_create_bloom_format(bits_per_key, false);
 }

-rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom(double bits_per_key) {
+rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_bloom(int bits_per_key) {
  return rocksdb_filterpolicy_create_bloom_format(bits_per_key, true);
 }

-rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_ribbon_format(
-    double bloom_equivalent_bits_per_key, int bloom_before_level) {
-  // Make a rocksdb_filterpolicy_t, but override all of its methods so
-  // they delegate to a NewRibbonFilterPolicy() instead of user
-  // supplied C functions.
-  struct Wrapper : public rocksdb_filterpolicy_t {
-    const FilterPolicy* rep_;
-    ~Wrapper() override { delete rep_; }
-    const char* Name() const override { return rep_->Name(); }
-    void CreateFilter(const Slice* keys, int n,
-                      std::string* dst) const override {
-      return rep_->CreateFilter(keys, n, dst);
-    }
-    bool KeyMayMatch(const Slice& key, const Slice& filter) const override {
-      return rep_->KeyMayMatch(key, filter);
-    }
-    ROCKSDB_NAMESPACE::FilterBitsBuilder* GetBuilderWithContext(
-        const ROCKSDB_NAMESPACE::FilterBuildingContext& context)
-        const override {
-      return rep_->GetBuilderWithContext(context);
-    }
-    ROCKSDB_NAMESPACE::FilterBitsReader* GetFilterBitsReader(
-        const Slice& contents) const override {
-      return rep_->GetFilterBitsReader(contents);
-    }
-    static void DoNothing(void*) {}
-  };
-  Wrapper* wrapper = new Wrapper;
-  wrapper->rep_ =
-      NewRibbonFilterPolicy(bloom_equivalent_bits_per_key, bloom_before_level);
-  wrapper->state_ = nullptr;
-  wrapper->delete_filter_ = nullptr;
-  wrapper->destructor_ = &Wrapper::DoNothing;
-  return wrapper;
-}
-
-rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_ribbon(
-    double bloom_equivalent_bits_per_key) {
-  return rocksdb_filterpolicy_create_ribbon_format(
-      bloom_equivalent_bits_per_key, /*bloom_before_level = disabled*/ -1);
-}
-
-rocksdb_filterpolicy_t* rocksdb_filterpolicy_create_ribbon_hybrid(
-    double bloom_equivalent_bits_per_key, int bloom_before_level) {
-  return rocksdb_filterpolicy_create_ribbon_format(
-      bloom_equivalent_bits_per_key, bloom_before_level);
-}
-
 rocksdb_mergeoperator_t* rocksdb_mergeoperator_create(
    void* state, void (*destructor)(void*),
    char* (*full_merge)(void*, const char* key, size_t key_length,
@@ -4131,25 +3798,6 @@ unsigned char rocksdb_readoptions_get_ignore_range_deletions(
  return opt->rep.ignore_range_deletions;
 }

-void rocksdb_readoptions_set_deadline(rocksdb_readoptions_t* opt,
-                                      uint64_t microseconds) {
-  opt->rep.deadline = std::chrono::microseconds(microseconds);
-}
-
-uint64_t rocksdb_readoptions_get_deadline(rocksdb_readoptions_t* opt) {
-  return opt->rep.deadline.count();
-}
-
-void rocksdb_readoptions_set_io_timeout(rocksdb_readoptions_t* opt,
-                                        uint64_t microseconds) {
-  opt->rep.io_timeout = std::chrono::microseconds(microseconds);
-}
-
-extern ROCKSDB_LIBRARY_API uint64_t
-rocksdb_readoptions_get_io_timeout(rocksdb_readoptions_t* opt) {
-  return opt->rep.io_timeout.count();
-}
-
 rocksdb_writeoptions_t* rocksdb_writeoptions_create() {
  return new rocksdb_writeoptions_t;
 }
@@ -4282,58 +3930,16 @@ unsigned char rocksdb_flushoptions_get_wait(rocksdb_flushoptions_t* opt) {
  return opt->rep.wait;
 }

-rocksdb_memory_allocator_t* rocksdb_jemalloc_nodump_allocator_create(
-    char** errptr) {
-  rocksdb_memory_allocator_t* allocator = new rocksdb_memory_allocator_t;
-  ROCKSDB_NAMESPACE::JemallocAllocatorOptions options;
-  SaveError(errptr, ROCKSDB_NAMESPACE::NewJemallocNodumpAllocator(
-                        options, &allocator->rep));
-  return allocator;
-}
-
-void rocksdb_memory_allocator_destroy(rocksdb_memory_allocator_t* allocator) {
-  delete allocator;
-}
-
-rocksdb_lru_cache_options_t* rocksdb_lru_cache_options_create() {
-  return new rocksdb_lru_cache_options_t;
-}
-
-void rocksdb_lru_cache_options_destroy(rocksdb_lru_cache_options_t* opt) {
-  delete opt;
-}
-
-void rocksdb_lru_cache_options_set_capacity(rocksdb_lru_cache_options_t* opt,
-                                            size_t capacity) {
-  opt->rep.capacity = capacity;
-}
-
-void rocksdb_lru_cache_options_set_memory_allocator(
-    rocksdb_lru_cache_options_t* opt, rocksdb_memory_allocator_t* allocator) {
-  opt->rep.memory_allocator = allocator->rep;
-}
-
 rocksdb_cache_t* rocksdb_cache_create_lru(size_t capacity) {
  rocksdb_cache_t* c = new rocksdb_cache_t;
  c->rep = NewLRUCache(capacity);
  return c;
 }

-rocksdb_cache_t* rocksdb_cache_create_lru_opts(
-    rocksdb_lru_cache_options_t* opt) {
-  rocksdb_cache_t* c = new rocksdb_cache_t;
-  c->rep = NewLRUCache(opt->rep);
-  return c;
-}
-
 void rocksdb_cache_destroy(rocksdb_cache_t* cache) {
  delete cache;
 }

-void rocksdb_cache_disown_data(rocksdb_cache_t* cache) {
-  cache->rep->DisownData();
-}
-
 void rocksdb_cache_set_capacity(rocksdb_cache_t* cache, size_t capacity) {
  cache->rep->SetCapacity(capacity);
 }
@@ -4379,36 +3985,20 @@ void rocksdb_env_set_background_threads(rocksdb_env_t* env, int n) {
  env->rep->SetBackgroundThreads(n);
 }

-int rocksdb_env_get_background_threads(rocksdb_env_t* env) {
-  return env->rep->GetBackgroundThreads();
-}
-
 void rocksdb_env_set_bottom_priority_background_threads(rocksdb_env_t* env,
                                                        int n) {
  env->rep->SetBackgroundThreads(n, Env::BOTTOM);
 }

-int rocksdb_env_get_bottom_priority_background_threads(rocksdb_env_t* env) {
-  return env->rep->GetBackgroundThreads(Env::BOTTOM);
-}
-
 void rocksdb_env_set_high_priority_background_threads(rocksdb_env_t* env, int n) {
  env->rep->SetBackgroundThreads(n, Env::HIGH);
 }

-int rocksdb_env_get_high_priority_background_threads(rocksdb_env_t* env) {
-  return env->rep->GetBackgroundThreads(Env::HIGH);
-}
-
 void rocksdb_env_set_low_priority_background_threads(rocksdb_env_t* env,
                                                     int n) {
  env->rep->SetBackgroundThreads(n, Env::LOW);
 }

-int rocksdb_env_get_low_priority_background_threads(rocksdb_env_t* env) {
-  return env->rep->GetBackgroundThreads(Env::LOW);
-}
-
 void rocksdb_env_join_all_threads(rocksdb_env_t* env) {
  env->rep->WaitForJoin();
 }
@@ -4636,62 +4226,32 @@ void rocksdb_universal_compaction_options_set_size_ratio(
  uco->rep->size_ratio = ratio;
 }

-int rocksdb_universal_compaction_options_get_size_ratio(
-    rocksdb_universal_compaction_options_t* uco) {
-  return uco->rep->size_ratio;
-}
-
 void rocksdb_universal_compaction_options_set_min_merge_width(
  rocksdb_universal_compaction_options_t* uco, int w) {
  uco->rep->min_merge_width = w;
 }

-int rocksdb_universal_compaction_options_get_min_merge_width(
-    rocksdb_universal_compaction_options_t* uco) {
-  return uco->rep->min_merge_width;
-}
-
 void rocksdb_universal_compaction_options_set_max_merge_width(
  rocksdb_universal_compaction_options_t* uco, int w) {
  uco->rep->max_merge_width = w;
 }

-int rocksdb_universal_compaction_options_get_max_merge_width(
-    rocksdb_universal_compaction_options_t* uco) {
-  return uco->rep->max_merge_width;
-}
-
 void rocksdb_universal_compaction_options_set_max_size_amplification_percent(
  rocksdb_universal_compaction_options_t* uco, int p) {
  uco->rep->max_size_amplification_percent = p;
 }

-int rocksdb_universal_compaction_options_get_max_size_amplification_percent(
-    rocksdb_universal_compaction_options_t* uco) {
-  return uco->rep->max_size_amplification_percent;
-}
-
 void rocksdb_universal_compaction_options_set_compression_size_percent(
  rocksdb_universal_compaction_options_t* uco, int p) {
  uco->rep->compression_size_percent = p;
 }

-int rocksdb_universal_compaction_options_get_compression_size_percent(
-    rocksdb_universal_compaction_options_t* uco) {
-  return uco->rep->compression_size_percent;
-}
-
 void rocksdb_universal_compaction_options_set_stop_style(
  rocksdb_universal_compaction_options_t* uco, int style) {
  uco->rep->stop_style =
      static_cast<ROCKSDB_NAMESPACE::CompactionStopStyle>(style);
 }

-int rocksdb_universal_compaction_options_get_stop_style(
-    rocksdb_universal_compaction_options_t* uco) {
-  return static_cast<int>(uco->rep->stop_style);
-}
-
 void rocksdb_universal_compaction_options_destroy(
  rocksdb_universal_compaction_options_t* uco) {
  delete uco->rep;
@@ -4709,11 +4269,6 @@ void rocksdb_fifo_compaction_options_set_max_table_files_size(
  fifo_opts->rep.max_table_files_size = size;
 }

-uint64_t rocksdb_fifo_compaction_options_get_max_table_files_size(
-    rocksdb_fifo_compaction_options_t* fifo_opts) {
-  return fifo_opts->rep.max_table_files_size;
-}
-
 void rocksdb_fifo_compaction_options_destroy(
    rocksdb_fifo_compaction_options_t* fifo_opts) {
  delete fifo_opts;
@@ -4903,27 +4458,6 @@ void rocksdb_optimistictransaction_options_set_set_snapshot(
  opt->rep.set_snapshot = v;
 }

-char* rocksdb_optimistictransactiondb_property_value(
-    rocksdb_optimistictransactiondb_t* db, const char* propname) {
-  std::string tmp;
-  if (db->rep->GetProperty(Slice(propname), &tmp)) {
-    // We use strdup() since we expect human readable output.
-    return strdup(tmp.c_str());
-  } else {
-    return nullptr;
-  }
-}
-
-int rocksdb_optimistictransactiondb_property_int(
-    rocksdb_optimistictransactiondb_t* db, const char* propname,
-    uint64_t* out_val) {
-  if (db->rep->GetIntProperty(Slice(propname), out_val)) {
-    return 0;
-  } else {
-    return -1;
-  }
-}
-
 rocksdb_column_family_handle_t* rocksdb_transactiondb_create_column_family(
    rocksdb_transactiondb_t* txn_db,
    const rocksdb_options_t* column_family_options,
@@ -4994,27 +4528,6 @@ void rocksdb_transactiondb_release_snapshot(
  delete snapshot;
 }

-char* rocksdb_transactiondb_property_value(rocksdb_transactiondb_t* db,
-                                           const char* propname) {
-  std::string tmp;
-  if (db->rep->GetProperty(Slice(propname), &tmp)) {
-    // We use strdup() since we expect human readable output.
-    return strdup(tmp.c_str());
-  } else {
-    return nullptr;
-  }
-}
-
-int rocksdb_transactiondb_property_int(rocksdb_transactiondb_t* db,
-                                       const char* propname,
-                                       uint64_t* out_val) {
-  if (db->rep->GetIntProperty(Slice(propname), out_val)) {
-    return 0;
-  } else {
-    return -1;
-  }
-}
-
 rocksdb_transaction_t* rocksdb_transaction_begin(
    rocksdb_transactiondb_t* txn_db,
    const rocksdb_writeoptions_t* write_options,
@@ -5054,10 +4567,7 @@ void rocksdb_transaction_destroy(rocksdb_transaction_t* txn) {

 const rocksdb_snapshot_t* rocksdb_transaction_get_snapshot(
    rocksdb_transaction_t* txn) {
-  // This will be freed later on using free, so use malloc here to avoid a
-  // mismatch
-  rocksdb_snapshot_t* result =
-      (rocksdb_snapshot_t*)malloc(sizeof(rocksdb_snapshot_t));
+  rocksdb_snapshot_t* result = new rocksdb_snapshot_t;
  result->rep = txn->rep->GetSnapshot();
  return result;
 }
@@ -5417,31 +4927,12 @@ rocksdb_transaction_t* rocksdb_optimistictransaction_begin(
  return old_txn;
 }

-// Write batch into OptimisticTransactionDB
-void rocksdb_optimistictransactiondb_write(
-    rocksdb_optimistictransactiondb_t* otxn_db,
-    const rocksdb_writeoptions_t* options, rocksdb_writebatch_t* batch,
-    char** errptr) {
-  SaveError(errptr, otxn_db->rep->Write(options->rep, &batch->rep));
-}
-
 void rocksdb_optimistictransactiondb_close(
    rocksdb_optimistictransactiondb_t* otxn_db) {
  delete otxn_db->rep;
  delete otxn_db;
 }

-rocksdb_checkpoint_t* rocksdb_optimistictransactiondb_checkpoint_object_create(
-    rocksdb_optimistictransactiondb_t* otxn_db, char** errptr) {
-  Checkpoint* checkpoint;
-  if (SaveError(errptr, Checkpoint::Create(otxn_db->rep, &checkpoint))) {
-    return nullptr;
-  }
-  rocksdb_checkpoint_t* result = new rocksdb_checkpoint_t;
-  result->rep = checkpoint;
-  return result;
-}
-
 void rocksdb_free(void* ptr) { free(ptr); }

 rocksdb_pinnableslice_t* rocksdb_get_pinned(
@@ -517,9 +517,6 @@ int main(int argc, char** argv) {
  coptions = rocksdb_compactoptions_create();
  rocksdb_compactoptions_set_exclusive_manual_compaction(coptions, 1);

-  rocksdb_options_add_compact_on_deletion_collector_factory(options, 10000,
-                                                            10001);
-
  StartPhase("destroy");
  rocksdb_destroy_db(options, dbname, &err);
  Free(&err);
@@ -991,9 +988,7 @@ int main(int argc, char** argv) {
                  &err);
      CheckNoError(err);
    }
-    rocksdb_approximate_sizes(db, 2, start, start_len, limit, limit_len, sizes,
-                              &err);
-    CheckNoError(err);
+    rocksdb_approximate_sizes(db, 2, start, start_len, limit, limit_len, sizes);
    CheckCondition(sizes[0] > 0);
    CheckCondition(sizes[1] > 0);
  }
@@ -1043,25 +1038,19 @@ int main(int argc, char** argv) {
  }

  StartPhase("filter");
-  for (run = 0; run <= 4; run++) {
-    // run=0 uses custom filter
-    // run=1 uses old block-based bloom filter
-    // run=2 run uses full bloom filter
-    // run=3 uses Ribbon
-    // run=4 uses Ribbon-Bloom hybrid configuration
+  for (run = 0; run <= 2; run++) {
+    // First run uses custom filter
+    // Second run uses old block-based bloom filter
+    // Third run uses full bloom filter
    CheckNoError(err);
    rocksdb_filterpolicy_t* policy;
    if (run == 0) {
      policy = rocksdb_filterpolicy_create(NULL, FilterDestroy, FilterCreate,
                                           FilterKeyMatch, NULL, FilterName);
    } else if (run == 1) {
-      policy = rocksdb_filterpolicy_create_bloom(8.0);
-    } else if (run == 2) {
-      policy = rocksdb_filterpolicy_create_bloom_full(8.0);
-    } else if (run == 3) {
-      policy = rocksdb_filterpolicy_create_ribbon(8.0);
+      policy = rocksdb_filterpolicy_create_bloom(8);
    } else {
-      policy = rocksdb_filterpolicy_create_ribbon_hybrid(8.0, 1);
+      policy = rocksdb_filterpolicy_create_bloom_full(8);
    }
    rocksdb_block_based_options_set_filter_policy(table_options, policy);

@@ -1127,12 +1116,10 @@ int main(int argc, char** argv) {
      } else if (run == 1) {
        // Essentially a fingerprint of the block-based Bloom schema
        CheckCondition(hits == 241);
-      } else if (run == 2 || run == 4) {
-        // Essentially a fingerprint of full Bloom schema, format_version=5
-        CheckCondition(hits == 188);
      } else {
-        // Essentially a fingerprint of Ribbon schema
-        CheckCondition(hits == 226);
+        // Essentially a fingerprint of the full Bloom schema(s),
+        // format_version < 5, which vary for three different CACHE_LINE_SIZEs
+        CheckCondition(hits == 224 || hits == 180 || hits == 125);
      }
      CheckCondition(
          (keys_to_query - hits) ==
@@ -1288,9 +1275,6 @@ int main(int argc, char** argv) {
    CheckPinGetCF(db, roptions, handles[1], "box", "c");
    rocksdb_writebatch_destroy(wb);

-    rocksdb_flush_wal(db, 1, &err);
-    CheckNoError(err);
-
    const char* keys[3] = { "box", "box", "barfooxx" };
    const rocksdb_column_family_handle_t* get_handles[3] = { handles[0], handles[1], handles[1] };
    const size_t keys_sizes[3] = { 3, 3, 8 };
@@ -1774,35 +1758,6 @@ int main(int argc, char** argv) {
    rocksdb_options_set_atomic_flush(o, 1);
    CheckCondition(1 == rocksdb_options_get_atomic_flush(o));

-    rocksdb_options_set_manual_wal_flush(o, 1);
-    CheckCondition(1 == rocksdb_options_get_manual_wal_flush(o));
-
-    /* Blob Options */
-    rocksdb_options_set_enable_blob_files(o, 1);
-    CheckCondition(1 == rocksdb_options_get_enable_blob_files(o));
-
-    rocksdb_options_set_min_blob_size(o, 29);
-    CheckCondition(29 == rocksdb_options_get_min_blob_size(o));
-
-    rocksdb_options_set_blob_file_size(o, 30);
-    CheckCondition(30 == rocksdb_options_get_blob_file_size(o));
-
-    rocksdb_options_set_blob_compression_type(o, 4);
-    CheckCondition(4 == rocksdb_options_get_blob_compression_type(o));
-
-    rocksdb_options_set_enable_blob_gc(o, 1);
-    CheckCondition(1 == rocksdb_options_get_enable_blob_gc(o));
-
-    rocksdb_options_set_blob_gc_age_cutoff(o, 0.5);
-    CheckCondition(0.5 == rocksdb_options_get_blob_gc_age_cutoff(o));
-
-    rocksdb_options_set_blob_gc_force_threshold(o, 0.75);
-    CheckCondition(0.75 == rocksdb_options_get_blob_gc_force_threshold(o));
-
-    rocksdb_options_set_blob_compaction_readahead_size(o, 262144);
-    CheckCondition(262144 ==
-                   rocksdb_options_get_blob_compaction_readahead_size(o));
-
    // Create a copy that should be equal to the original.
    rocksdb_options_t* copy;
    copy = rocksdb_options_create_copy(o);
@@ -2324,12 +2279,6 @@ int main(int argc, char** argv) {
    rocksdb_readoptions_set_ignore_range_deletions(ro, 1);
    CheckCondition(1 == rocksdb_readoptions_get_ignore_range_deletions(ro));

-    rocksdb_readoptions_set_deadline(ro, 300);
-    CheckCondition(300 == rocksdb_readoptions_get_deadline(ro));
-
-    rocksdb_readoptions_set_io_timeout(ro, 400);
-    CheckCondition(400 == rocksdb_readoptions_get_io_timeout(ro));
-
    rocksdb_readoptions_destroy(ro);
  }

@@ -2406,177 +2355,6 @@ int main(int argc, char** argv) {
    rocksdb_cache_destroy(co);
  }

-  StartPhase("jemalloc_nodump_allocator");
-  {
-    rocksdb_memory_allocator_t* allocator;
-    allocator = rocksdb_jemalloc_nodump_allocator_create(&err);
-    if (err != NULL) {
-      // not supported on all platforms, allow unsupported error
-      const char* ni = "Not implemented: ";
-      size_t ni_len = strlen(ni);
-      size_t err_len = strlen(err);
-
-      CheckCondition(err_len >= ni_len);
-      CheckCondition(memcmp(ni, err, ni_len) == 0);
-      Free(&err);
-    } else {
-      rocksdb_cache_t* co;
-      rocksdb_lru_cache_options_t* copts;
-
-      copts = rocksdb_lru_cache_options_create();
-
-      rocksdb_lru_cache_options_set_capacity(copts, 100);
-      rocksdb_lru_cache_options_set_memory_allocator(copts, allocator);
-
-      co = rocksdb_cache_create_lru_opts(copts);
-      CheckCondition(100 == rocksdb_cache_get_capacity(co));
-
-      rocksdb_cache_destroy(co);
-      rocksdb_lru_cache_options_destroy(copts);
-    }
-    rocksdb_memory_allocator_destroy(allocator);
-  }
-
-  StartPhase("env");
-  {
-    rocksdb_env_t* e;
-    e = rocksdb_create_default_env();
-
-    rocksdb_env_set_background_threads(e, 10);
-    CheckCondition(10 == rocksdb_env_get_background_threads(e));
-
-    rocksdb_env_set_high_priority_background_threads(e, 20);
-    CheckCondition(20 == rocksdb_env_get_high_priority_background_threads(e));
-
-    rocksdb_env_set_low_priority_background_threads(e, 30);
-    CheckCondition(30 == rocksdb_env_get_low_priority_background_threads(e));
-
-    rocksdb_env_set_bottom_priority_background_threads(e, 40);
-    CheckCondition(40 == rocksdb_env_get_bottom_priority_background_threads(e));
-
-    rocksdb_env_destroy(e);
-  }
-
-  StartPhase("universal_compaction_options");
-  {
-    rocksdb_universal_compaction_options_t* uco;
-    uco = rocksdb_universal_compaction_options_create();
-
-    rocksdb_universal_compaction_options_set_size_ratio(uco, 5);
-    CheckCondition(5 ==
-                   rocksdb_universal_compaction_options_get_size_ratio(uco));
-
-    rocksdb_universal_compaction_options_set_min_merge_width(uco, 15);
-    CheckCondition(
-        15 == rocksdb_universal_compaction_options_get_min_merge_width(uco));
-
-    rocksdb_universal_compaction_options_set_max_merge_width(uco, 25);
-    CheckCondition(
-        25 == rocksdb_universal_compaction_options_get_max_merge_width(uco));
-
-    rocksdb_universal_compaction_options_set_max_size_amplification_percent(uco,
-                                                                            35);
-    CheckCondition(
-        35 ==
-        rocksdb_universal_compaction_options_get_max_size_amplification_percent(
-            uco));
-
-    rocksdb_universal_compaction_options_set_compression_size_percent(uco, 45);
-    CheckCondition(
-        45 ==
-        rocksdb_universal_compaction_options_get_compression_size_percent(uco));
-
-    rocksdb_universal_compaction_options_set_stop_style(uco, 1);
-    CheckCondition(1 ==
-                   rocksdb_universal_compaction_options_get_stop_style(uco));
-
-    rocksdb_universal_compaction_options_destroy(uco);
-  }
-
-  StartPhase("fifo_compaction_options");
-  {
-    rocksdb_fifo_compaction_options_t* fco;
-    fco = rocksdb_fifo_compaction_options_create();
-
-    rocksdb_fifo_compaction_options_set_max_table_files_size(fco, 100000);
-    CheckCondition(
-        100000 ==
-        rocksdb_fifo_compaction_options_get_max_table_files_size(fco));
-
-    rocksdb_fifo_compaction_options_destroy(fco);
-  }
-
-  StartPhase("backupable_db_option");
-  {
-    rocksdb_backupable_db_options_t* bdo;
-    bdo = rocksdb_backupable_db_options_create("path");
-
-    rocksdb_backupable_db_options_set_share_table_files(bdo, 1);
-    CheckCondition(1 ==
-                   rocksdb_backupable_db_options_get_share_table_files(bdo));
-
-    rocksdb_backupable_db_options_set_sync(bdo, 1);
-    CheckCondition(1 == rocksdb_backupable_db_options_get_sync(bdo));
-
-    rocksdb_backupable_db_options_set_destroy_old_data(bdo, 1);
-    CheckCondition(1 ==
-                   rocksdb_backupable_db_options_get_destroy_old_data(bdo));
-
-    rocksdb_backupable_db_options_set_backup_log_files(bdo, 1);
-    CheckCondition(1 ==
-                   rocksdb_backupable_db_options_get_backup_log_files(bdo));
-
-    rocksdb_backupable_db_options_set_backup_rate_limit(bdo, 123);
-    CheckCondition(123 ==
-                   rocksdb_backupable_db_options_get_backup_rate_limit(bdo));
-
-    rocksdb_backupable_db_options_set_restore_rate_limit(bdo, 37);
-    CheckCondition(37 ==
-                   rocksdb_backupable_db_options_get_restore_rate_limit(bdo));
-
-    rocksdb_backupable_db_options_set_max_background_operations(bdo, 20);
-    CheckCondition(
-        20 == rocksdb_backupable_db_options_get_max_background_operations(bdo));
-
-    rocksdb_backupable_db_options_set_callback_trigger_interval_size(bdo, 9000);
-    CheckCondition(
-        9000 ==
-        rocksdb_backupable_db_options_get_callback_trigger_interval_size(bdo));
-
-    rocksdb_backupable_db_options_set_max_valid_backups_to_open(bdo, 40);
-    CheckCondition(
-        40 == rocksdb_backupable_db_options_get_max_valid_backups_to_open(bdo));
-
-    rocksdb_backupable_db_options_set_share_files_with_checksum_naming(bdo, 2);
-    CheckCondition(
-        2 == rocksdb_backupable_db_options_get_share_files_with_checksum_naming(
-                 bdo));
-
-    rocksdb_backupable_db_options_destroy(bdo);
-  }
-
-  StartPhase("compression_options");
-  {
-    rocksdb_options_t* co;
-    co = rocksdb_options_create();
-
-    rocksdb_options_set_compression_options_zstd_max_train_bytes(co, 100);
-    CheckCondition(
-        100 ==
-        rocksdb_options_get_compression_options_zstd_max_train_bytes(co));
-
-    rocksdb_options_set_compression_options_parallel_threads(co, 2);
-    CheckCondition(
-        2 == rocksdb_options_get_compression_options_parallel_threads(co));
-
-    rocksdb_options_set_compression_options_max_dict_buffer_bytes(co, 200);
-    CheckCondition(
-        200 ==
-        rocksdb_options_get_compression_options_max_dict_buffer_bytes(co));
-
-    rocksdb_options_destroy(co);
-  }
-
  StartPhase("iterate_upper_bound");
  {
    // Create new empty database
@@ -2977,7 +2755,7 @@ int main(int argc, char** argv) {

 #else

-int main(void) {
+int main() {
  fprintf(stderr, "SKIPPED\n");
  return 0;
 }
@@ -16,7 +16,6 @@
 #include <string>
 #include <vector>

-#include "db/blob/blob_file_cache.h"
 #include "db/compaction/compaction_picker.h"
 #include "db/compaction/compaction_picker_fifo.h"
 #include "db/compaction/compaction_picker_level.h"
@@ -29,11 +28,10 @@
 #include "db/version_set.h"
 #include "db/write_controller.h"
 #include "file/sst_file_manager_impl.h"
-#include "logging/logging.h"
+#include "memtable/hash_skiplist_rep.h"
 #include "monitoring/thread_status_util.h"
 #include "options/options_helper.h"
 #include "port/port.h"
-#include "rocksdb/convenience.h"
 #include "rocksdb/table.h"
 #include "table/merging_iterator.h"
 #include "util/autovector.h"
@@ -75,6 +73,11 @@ ColumnFamilyHandleImpl::~ColumnFamilyHandleImpl() {
      bool defer_purge =
          db_->immutable_db_options().avoid_unnecessary_blocking_io;
      db_->PurgeObsoleteFiles(job_context, defer_purge);
+      if (defer_purge) {
+        mutex_->Lock();
+        db_->SchedulePurge();
+        mutex_->Unlock();
+      }
    }
    job_context.Clean();
  }
@@ -104,9 +107,8 @@ const Comparator* ColumnFamilyHandleImpl::GetComparator() const {

 void GetIntTblPropCollectorFactory(
    const ImmutableCFOptions& ioptions,
-    IntTblPropCollectorFactories* int_tbl_prop_collector_factories) {
-  assert(int_tbl_prop_collector_factories);
-
+    std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+        int_tbl_prop_collector_factories) {
  auto& collector_factories = ioptions.table_properties_collector_factories;
  for (size_t i = 0; i < ioptions.table_properties_collector_factories.size();
       ++i) {
@@ -198,7 +200,7 @@ Status CheckCFPathsSupported(const DBOptions& db_options,
 namespace {
 const uint64_t kDefaultTtl = 0xfffffffffffffffe;
 const uint64_t kDefaultPeriodicCompSecs = 0xfffffffffffffffe;
-}  // namespace
+};  // namespace

 ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
                                    const ColumnFamilyOptions& src) {
@@ -206,13 +208,11 @@ ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
  size_t clamp_max = std::conditional<
      sizeof(size_t) == 4, std::integral_constant<size_t, 0xffffffff>,
      std::integral_constant<uint64_t, 64ull << 30>>::type::value;
-  ClipToRange(&result.write_buffer_size, (static_cast<size_t>(64)) << 10,
-              clamp_max);
+  ClipToRange(&result.write_buffer_size, ((size_t)64) << 10, clamp_max);
  // if user sets arena_block_size, we trust user to use this value. Otherwise,
  // calculate a proper value from writer_buffer_size;
  if (result.arena_block_size <= 0) {
-    result.arena_block_size =
-        std::min(size_t{1024 * 1024}, result.write_buffer_size / 8);
+    result.arena_block_size = result.write_buffer_size / 8;

    // Align up to 4k
    const size_t align = 4 * 1024;
@@ -281,7 +281,7 @@ ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
  }

  if (result.level0_file_num_compaction_trigger == 0) {
-    ROCKS_LOG_WARN(db_options.logger,
+    ROCKS_LOG_WARN(db_options.info_log.get(),
                   "level0_file_num_compaction_trigger cannot be 0");
    result.level0_file_num_compaction_trigger = 1;
  }
@@ -290,7 +290,7 @@ ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
          result.level0_slowdown_writes_trigger ||
      result.level0_slowdown_writes_trigger <
          result.level0_file_num_compaction_trigger) {
-    ROCKS_LOG_WARN(db_options.logger,
+    ROCKS_LOG_WARN(db_options.info_log.get(),
                   "This condition must be satisfied: "
                   "level0_stop_writes_trigger(%d) >= "
                   "level0_slowdown_writes_trigger(%d) >= "
@@ -307,7 +307,7 @@ ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
        result.level0_slowdown_writes_trigger) {
      result.level0_stop_writes_trigger = result.level0_slowdown_writes_trigger;
    }
-    ROCKS_LOG_WARN(db_options.logger,
+    ROCKS_LOG_WARN(db_options.info_log.get(),
                   "Adjust the value to "
                   "level0_stop_writes_trigger(%d)"
                   "level0_slowdown_writes_trigger(%d)"
@@ -334,9 +334,7 @@ ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
  // was not used)
  auto sfm = static_cast<SstFileManagerImpl*>(db_options.sst_file_manager.get());
  for (size_t i = 0; i < result.cf_paths.size(); i++) {
-    DeleteScheduler::CleanupDirectory(db_options.env, sfm,
-                                      result.cf_paths[i].path)
-        .PermitUncheckedError();
+    DeleteScheduler::CleanupDirectory(db_options.env, sfm, result.cf_paths[i].path);
  }
 #endif

@@ -345,18 +343,12 @@ ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
  }

  if (result.level_compaction_dynamic_level_bytes) {
-    if (result.compaction_style != kCompactionStyleLevel) {
-      ROCKS_LOG_WARN(db_options.info_log.get(),
-                     "level_compaction_dynamic_level_bytes only makes sense"
-                     "for level-based compaction");
-      result.level_compaction_dynamic_level_bytes = false;
-    } else if (result.cf_paths.size() > 1U) {
-      // we don't yet know how to make both of this feature and multiple
-      // DB path work.
-      ROCKS_LOG_WARN(db_options.info_log.get(),
-                     "multiple cf_paths/db_paths and"
-                     "level_compaction_dynamic_level_bytes"
-                     "can't be used together");
+    if (result.compaction_style != kCompactionStyleLevel ||
+        result.cf_paths.size() > 1U) {
+      // 1. level_compaction_dynamic_level_bytes only makes sense for
+      //    level-based compaction.
+      // 2. we don't yet know how to make both of this feature and multiple
+      //    DB path work.
      result.level_compaction_dynamic_level_bytes = false;
    }
  }
@@ -447,9 +439,6 @@ bool SuperVersion::Unref() {

 void SuperVersion::Cleanup() {
  assert(refs.load(std::memory_order_relaxed) == 0);
-  // Since this SuperVersion object is being deleted,
-  // decrement reference to the immutable MemtableList
-  // this SV object was pointing to.
  imm->Unref(&to_delete);
  MemTable* m = mem->Unref();
  if (m != nullptr) {
@@ -459,7 +448,9 @@ void SuperVersion::Cleanup() {
    to_delete.push_back(m);
  }
  current->Unref();
-  cfd->UnrefAndTryDelete();
+  if (cfd->Unref()) {
+    delete cfd;
+  }
 }

 void SuperVersion::Init(ColumnFamilyData* new_cfd, MemTable* new_mem,
@@ -477,10 +468,10 @@ void SuperVersion::Init(ColumnFamilyData* new_cfd, MemTable* new_mem,

 namespace {
 void SuperVersionUnrefHandle(void* ptr) {
-  // UnrefHandle is called when a thread exits or a ThreadLocalPtr gets
-  // destroyed. When the former happens, the thread shouldn't see kSVInUse.
-  // When the latter happens, only super_version_ holds a reference
-  // to ColumnFamilyData, so no further queries are possible.
+  // UnrefHandle is called when a thread exists or a ThreadLocalPtr gets
+  // destroyed. When former happens, the thread shouldn't see kSVInUse.
+  // When latter happens, we are in ~ColumnFamilyData(), no get should happen as
+  // well.
  SuperVersion* sv = static_cast<SuperVersion*>(ptr);
  bool was_last_ref __attribute__((__unused__));
  was_last_ref = sv->Unref();
@@ -507,10 +498,9 @@ ColumnFamilyData::ColumnFamilyData(
    uint32_t id, const std::string& name, Version* _dummy_versions,
    Cache* _table_cache, WriteBufferManager* write_buffer_manager,
    const ColumnFamilyOptions& cf_options, const ImmutableDBOptions& db_options,
-    const FileOptions* file_options, ColumnFamilySet* column_family_set,
+    const FileOptions& file_options, ColumnFamilySet* column_family_set,
    BlockCacheTracer* const block_cache_tracer,
-    const std::shared_ptr<IOTracer>& io_tracer,
-    const std::string& db_session_id)
+    const std::shared_ptr<IOTracer>& io_tracer)
    : id_(id),
      name_(name),
      dummy_versions_(_dummy_versions),
@@ -553,7 +543,7 @@ ColumnFamilyData::ColumnFamilyData(
      db_paths_registered_ = true;
    } else {
      ROCKS_LOG_ERROR(
-          ioptions_.logger,
+          ioptions_.info_log,
          "Failed to register data paths of column family (id: %d, name: %s)",
          id_, name_.c_str());
    }
@@ -566,14 +556,9 @@ ColumnFamilyData::ColumnFamilyData(
  // if _dummy_versions is nullptr, then this is a dummy column family.
  if (_dummy_versions != nullptr) {
    internal_stats_.reset(
-        new InternalStats(ioptions_.num_levels, ioptions_.clock, this));
+        new InternalStats(ioptions_.num_levels, db_options.env, this));
    table_cache_.reset(new TableCache(ioptions_, file_options, _table_cache,
-                                      block_cache_tracer, io_tracer,
-                                      db_session_id));
-    blob_file_cache_.reset(
-        new BlobFileCache(_table_cache, ioptions(), soptions(), id_,
-                          internal_stats_->GetBlobFileReadHist(), io_tracer));
-
+                                      block_cache_tracer, io_tracer));
    if (ioptions_.compaction_style == kCompactionStyleLevel) {
      compaction_picker_.reset(
          new LevelCompactionPicker(ioptions_, &internal_comparator_));
@@ -587,13 +572,13 @@ ColumnFamilyData::ColumnFamilyData(
    } else if (ioptions_.compaction_style == kCompactionStyleNone) {
      compaction_picker_.reset(new NullCompactionPicker(
          ioptions_, &internal_comparator_));
-      ROCKS_LOG_WARN(ioptions_.logger,
+      ROCKS_LOG_WARN(ioptions_.info_log,
                     "Column family %s does not use any background compaction. "
                     "Compactions can only be done via CompactFiles\n",
                     GetName().c_str());
 #endif  // !ROCKSDB_LITE
    } else {
-      ROCKS_LOG_ERROR(ioptions_.logger,
+      ROCKS_LOG_ERROR(ioptions_.info_log,
                      "Unable to recognize the specified compaction style %d. "
                      "Column family %s will use kCompactionStyleLevel.\n",
                      ioptions_.compaction_style, GetName().c_str());
@@ -602,12 +587,12 @@ ColumnFamilyData::ColumnFamilyData(
    }

    if (column_family_set_->NumberOfColumnFamilies() < 10) {
-      ROCKS_LOG_INFO(ioptions_.logger,
+      ROCKS_LOG_INFO(ioptions_.info_log,
                     "--------------- Options for column family [%s]:\n",
                     name.c_str());
-      initial_cf_options_.Dump(ioptions_.logger);
+      initial_cf_options_.Dump(ioptions_.info_log);
    } else {
-      ROCKS_LOG_INFO(ioptions_.logger, "\t(skipping printing options)\n");
+      ROCKS_LOG_INFO(ioptions_.info_log, "\t(skipping printing options)\n");
    }
  }

@@ -642,7 +627,7 @@ ColumnFamilyData::~ColumnFamilyData() {

  if (dummy_versions_ != nullptr) {
    // List must be empty
-    assert(dummy_versions_->Next() == dummy_versions_);
+    assert(dummy_versions_->TEST_Next() == dummy_versions_);
    bool deleted __attribute__((__unused__));
    deleted = dummy_versions_->Unref();
    assert(deleted);
@@ -663,7 +648,7 @@ ColumnFamilyData::~ColumnFamilyData() {
    Status s = ioptions_.env->UnregisterDbPaths(GetDbPaths());
    if (!s.ok()) {
      ROCKS_LOG_ERROR(
-          ioptions_.logger,
+          ioptions_.info_log,
          "Failed to unregister data paths of column family (id: %d, name: %s)",
          id_, name_.c_str());
    }
@@ -684,13 +669,14 @@ bool ColumnFamilyData::UnrefAndTryDelete() {
    // Only the super_version_ holds me
    SuperVersion* sv = super_version_;
    super_version_ = nullptr;
-
-    // Release SuperVersion references kept in ThreadLocalPtr.
+    // Release SuperVersion reference kept in ThreadLocalPtr.
+    // This must be done outside of mutex_ since unref handler can lock mutex.
+    sv->db_mutex->Unlock();
    local_sv_.reset();
+    sv->db_mutex->Lock();

    if (sv->Unref()) {
-      // Note: sv will delete this ColumnFamilyData during Cleanup()
-      assert(sv->cfd == this);
+      // May delete this ColumnFamilyData after calling Cleanup()
      sv->Cleanup();
      delete sv;
      return true;
@@ -717,7 +703,9 @@ uint64_t ColumnFamilyData::OldestLogToKeep() {
  auto current_log = GetLogNumber();

  if (allow_2pc_) {
-    auto imm_prep_log = imm()->PrecomputeMinLogContainingPrepSection();
+    autovector<MemTable*> empty_list;
+    auto imm_prep_log =
+        imm()->PrecomputeMinLogContainingPrepSection(empty_list);
    auto mem_prep_log = mem()->GetMinLogContainingPrepSection();

    if (imm_prep_log > 0 && imm_prep_log < current_log) {
@@ -839,8 +827,7 @@ std::pair<WriteStallCondition, ColumnFamilyData::WriteStallCause>
 ColumnFamilyData::GetWriteStallConditionAndCause(
    int num_unflushed_memtables, int num_l0_files,
    uint64_t num_compaction_needed_bytes,
-    const MutableCFOptions& mutable_cf_options,
-    const ImmutableCFOptions& immutable_cf_options) {
+    const MutableCFOptions& mutable_cf_options) {
  if (num_unflushed_memtables >= mutable_cf_options.max_write_buffer_number) {
    return {WriteStallCondition::kStopped, WriteStallCause::kMemtableLimit};
  } else if (!mutable_cf_options.disable_auto_compactions &&
@@ -854,9 +841,7 @@ ColumnFamilyData::GetWriteStallConditionAndCause(
            WriteStallCause::kPendingCompactionBytes};
  } else if (mutable_cf_options.max_write_buffer_number > 3 &&
             num_unflushed_memtables >=
-                 mutable_cf_options.max_write_buffer_number - 1 &&
-             num_unflushed_memtables - 1 >=
-                 immutable_cf_options.min_write_buffer_number_to_merge) {
+                 mutable_cf_options.max_write_buffer_number - 1) {
    return {WriteStallCondition::kDelayed, WriteStallCause::kMemtableLimit};
  } else if (!mutable_cf_options.disable_auto_compactions &&
             mutable_cf_options.level0_slowdown_writes_trigger >= 0 &&
@@ -884,8 +869,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(

    auto write_stall_condition_and_cause = GetWriteStallConditionAndCause(
        imm()->NumNotFlushed(), vstorage->l0_delay_trigger_count(),
-        vstorage->estimated_compaction_needed_bytes(), mutable_cf_options,
-        *ioptions());
+        vstorage->estimated_compaction_needed_bytes(), mutable_cf_options);
    write_stall_condition = write_stall_condition_and_cause.first;
    auto write_stall_cause = write_stall_condition_and_cause.second;

@@ -897,7 +881,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
      write_controller_token_ = write_controller->GetStopToken();
      internal_stats_->AddCFStats(InternalStats::MEMTABLE_LIMIT_STOPS, 1);
      ROCKS_LOG_WARN(
-          ioptions_.logger,
+          ioptions_.info_log,
          "[%s] Stopping writes because we have %d immutable memtables "
          "(waiting for flush), max_write_buffer_number is set to %d",
          name_.c_str(), imm()->NumNotFlushed(),
@@ -910,7 +894,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
        internal_stats_->AddCFStats(
            InternalStats::LOCKED_L0_FILE_COUNT_LIMIT_STOPS, 1);
      }
-      ROCKS_LOG_WARN(ioptions_.logger,
+      ROCKS_LOG_WARN(ioptions_.info_log,
                     "[%s] Stopping writes because we have %d level-0 files",
                     name_.c_str(), vstorage->l0_delay_trigger_count());
    } else if (write_stall_condition == WriteStallCondition::kStopped &&
@@ -919,7 +903,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
      internal_stats_->AddCFStats(
          InternalStats::PENDING_COMPACTION_BYTES_LIMIT_STOPS, 1);
      ROCKS_LOG_WARN(
-          ioptions_.logger,
+          ioptions_.info_log,
          "[%s] Stopping writes because of estimated pending compaction "
          "bytes %" PRIu64,
          name_.c_str(), compaction_needed_bytes);
@@ -931,7 +915,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
                     mutable_cf_options.disable_auto_compactions);
      internal_stats_->AddCFStats(InternalStats::MEMTABLE_LIMIT_SLOWDOWNS, 1);
      ROCKS_LOG_WARN(
-          ioptions_.logger,
+          ioptions_.info_log,
          "[%s] Stalling writes because we have %d immutable memtables "
          "(waiting for flush), max_write_buffer_number is set to %d "
          "rate %" PRIu64,
@@ -953,7 +937,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
        internal_stats_->AddCFStats(
            InternalStats::LOCKED_L0_FILE_COUNT_LIMIT_SLOWDOWNS, 1);
      }
-      ROCKS_LOG_WARN(ioptions_.logger,
+      ROCKS_LOG_WARN(ioptions_.info_log,
                     "[%s] Stalling writes because we have %d level-0 files "
                     "rate %" PRIu64,
                     name_.c_str(), vstorage->l0_delay_trigger_count(),
@@ -978,7 +962,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
      internal_stats_->AddCFStats(
          InternalStats::PENDING_COMPACTION_BYTES_LIMIT_SLOWDOWNS, 1);
      ROCKS_LOG_WARN(
-          ioptions_.logger,
+          ioptions_.info_log,
          "[%s] Stalling writes because of estimated pending compaction "
          "bytes %" PRIu64 " rate %" PRIu64,
          name_.c_str(), vstorage->estimated_compaction_needed_bytes(),
@@ -992,7 +976,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
        write_controller_token_ =
            write_controller->GetCompactionPressureToken();
        ROCKS_LOG_INFO(
-            ioptions_.logger,
+            ioptions_.info_log,
            "[%s] Increasing compaction threads because we have %d level-0 "
            "files ",
            name_.c_str(), vstorage->l0_delay_trigger_count());
@@ -1006,7 +990,7 @@ WriteStallCondition ColumnFamilyData::RecalculateWriteStallConditions(
            write_controller->GetCompactionPressureToken();
        if (mutable_cf_options.soft_pending_compaction_bytes_limit > 0) {
          ROCKS_LOG_INFO(
-              ioptions_.logger,
+              ioptions_.info_log,
              "[%s] Increasing compaction threads because of estimated pending "
              "compaction "
              "bytes %" PRIu64,
@@ -1051,10 +1035,6 @@ uint64_t ColumnFamilyData::GetTotalSstFilesSize() const {
  return VersionSet::GetTotalSstFilesSize(dummy_versions_);
 }

-uint64_t ColumnFamilyData::GetTotalBlobFileSize() const {
-  return VersionSet::GetTotalBlobFileSize(dummy_versions_);
-}
-
 uint64_t ColumnFamilyData::GetLiveSstFilesSize() const {
  return current_->GetSstFilesSize();
 }
@@ -1103,7 +1083,7 @@ bool ColumnFamilyData::RangeOverlapWithCompaction(

 Status ColumnFamilyData::RangesOverlapWithMemtables(
    const autovector<Range>& ranges, SuperVersion* super_version,
-    bool allow_data_in_errors, bool* overlap) {
+    bool* overlap) {
  assert(overlap != nullptr);
  *overlap = false;
  // Create an InternalIterator over all unflushed memtables
@@ -1136,12 +1116,13 @@ Status ColumnFamilyData::RangesOverlapWithMemtables(
    memtable_iter->Seek(range_start.Encode());
    status = memtable_iter->status();
    ParsedInternalKey seek_result;
-
-    if (status.ok() && memtable_iter->Valid()) {
-      status = ParseInternalKey(memtable_iter->key(), &seek_result,
-                                allow_data_in_errors);
+    if (status.ok()) {
+      if (memtable_iter->Valid() &&
+          ParseInternalKey(memtable_iter->key(), &seek_result) !=
+              Status::OK()) {
+        status = Status::Corruption("DB have corrupted keys");
+      }
    }
-
    if (status.ok()) {
      if (memtable_iter->Valid() &&
          ucmp->Compare(seek_result.user_key, ranges[i].limit) <= 0) {
@@ -1211,11 +1192,11 @@ SuperVersion* ColumnFamilyData::GetThreadLocalSuperVersion(DBImpl* db) {
  SuperVersion* sv = static_cast<SuperVersion*>(ptr);
  if (sv == SuperVersion::kSVObsolete ||
      sv->version_number != super_version_number_.load()) {
-    RecordTick(ioptions_.stats, NUMBER_SUPERVERSION_ACQUIRES);
+    RecordTick(ioptions_.statistics, NUMBER_SUPERVERSION_ACQUIRES);
    SuperVersion* sv_to_delete = nullptr;

    if (sv && sv->Unref()) {
-      RecordTick(ioptions_.stats, NUMBER_SUPERVERSION_CLEANUPS);
+      RecordTick(ioptions_.statistics, NUMBER_SUPERVERSION_CLEANUPS);
      db->mutex()->Lock();
      // NOTE: underlying resources held by superversion (sst files) might
      // not be released until the next background job.
@@ -1259,13 +1240,14 @@ bool ColumnFamilyData::ReturnThreadLocalSuperVersion(SuperVersion* sv) {
 void ColumnFamilyData::InstallSuperVersion(
    SuperVersionContext* sv_context, InstrumentedMutex* db_mutex) {
  db_mutex->AssertHeld();
-  return InstallSuperVersion(sv_context, mutable_cf_options_);
+  return InstallSuperVersion(sv_context, db_mutex, mutable_cf_options_);
 }

 void ColumnFamilyData::InstallSuperVersion(
-    SuperVersionContext* sv_context,
+    SuperVersionContext* sv_context, InstrumentedMutex* db_mutex,
    const MutableCFOptions& mutable_cf_options) {
  SuperVersion* new_superversion = sv_context->new_superversion.release();
+  new_superversion->db_mutex = db_mutex;
  new_superversion->mutable_cf_options = mutable_cf_options;
  new_superversion->Init(this, mem_, imm_.current(), current_);
  SuperVersion* old_superversion = super_version_;
@@ -1353,46 +1335,24 @@ Status ColumnFamilyData::ValidateOptions(
          "Block-Based Table format. ");
    }
  }
-
-  if (cf_options.enable_blob_garbage_collection) {
-    if (cf_options.blob_garbage_collection_age_cutoff < 0.0 ||
-        cf_options.blob_garbage_collection_age_cutoff > 1.0) {
-      return Status::InvalidArgument(
-          "The age cutoff for blob garbage collection should be in the range "
-          "[0.0, 1.0].");
-    }
-    if (cf_options.blob_garbage_collection_force_threshold < 0.0 ||
-        cf_options.blob_garbage_collection_force_threshold > 1.0) {
-      return Status::InvalidArgument(
-          "The garbage ratio threshold for forcing blob garbage collection "
-          "should be in the range [0.0, 1.0].");
-    }
-  }
-
-  if (cf_options.compaction_style == kCompactionStyleFIFO &&
-      db_options.max_open_files != -1 && cf_options.ttl > 0) {
-    return Status::NotSupported(
-        "FIFO compaction only supported with max_open_files = -1.");
-  }
-
  return s;
 }

 #ifndef ROCKSDB_LITE
 Status ColumnFamilyData::SetOptions(
-    const DBOptions& db_opts,
+    const DBOptions& db_options,
    const std::unordered_map<std::string, std::string>& options_map) {
-  ColumnFamilyOptions cf_opts =
-      BuildColumnFamilyOptions(initial_cf_options_, mutable_cf_options_);
-  ConfigOptions config_opts;
-  config_opts.mutable_options_only = true;
-  Status s = GetColumnFamilyOptionsFromMap(config_opts, cf_opts, options_map,
-                                           &cf_opts);
+  MutableCFOptions new_mutable_cf_options;
+  Status s =
+      GetMutableOptionsFromStrings(mutable_cf_options_, options_map,
+                                   ioptions_.info_log, &new_mutable_cf_options);
  if (s.ok()) {
-    s = ValidateOptions(db_opts, cf_opts);
+    ColumnFamilyOptions cf_options =
+        BuildColumnFamilyOptions(initial_cf_options_, new_mutable_cf_options);
+    s = ValidateOptions(db_options, cf_options);
  }
  if (s.ok()) {
-    mutable_cf_options_ = MutableCFOptions(cf_opts);
+    mutable_cf_options_ = new_mutable_cf_options;
    mutable_cf_options_.RefreshDerivedOptions(ioptions_);
  }
  return s;
@@ -1431,8 +1391,7 @@ Status ColumnFamilyData::AddDirectories(

    if (existing_dir == created_dirs->end()) {
      std::unique_ptr<FSDirectory> path_directory;
-      s = DBImpl::CreateAndNewDirectory(ioptions_.fs.get(), p.path,
-                                        &path_directory);
+      s = DBImpl::CreateAndNewDirectory(ioptions_.fs, p.path, &path_directory);
      if (!s.ok()) {
        return s;
      }
@@ -1463,23 +1422,21 @@ ColumnFamilySet::ColumnFamilySet(const std::string& dbname,
                                 WriteBufferManager* _write_buffer_manager,
                                 WriteController* _write_controller,
                                 BlockCacheTracer* const block_cache_tracer,
-                                 const std::shared_ptr<IOTracer>& io_tracer,
-                                 const std::string& db_session_id)
+                                 const std::shared_ptr<IOTracer>& io_tracer)
    : max_column_family_(0),
-      file_options_(file_options),
      dummy_cfd_(new ColumnFamilyData(
          ColumnFamilyData::kDummyColumnFamilyDataId, "", nullptr, nullptr,
-          nullptr, ColumnFamilyOptions(), *db_options, &file_options_, nullptr,
-          block_cache_tracer, io_tracer, db_session_id)),
+          nullptr, ColumnFamilyOptions(), *db_options, file_options, nullptr,
+          block_cache_tracer, io_tracer)),
      default_cfd_cache_(nullptr),
      db_name_(dbname),
      db_options_(db_options),
+      file_options_(file_options),
      table_cache_(table_cache),
      write_buffer_manager_(_write_buffer_manager),
      write_controller_(_write_controller),
      block_cache_tracer_(block_cache_tracer),
-      io_tracer_(io_tracer),
-      db_session_id_(db_session_id) {
+      io_tracer_(io_tracer) {
  // initialize linked list
  dummy_cfd_->prev_ = dummy_cfd_;
  dummy_cfd_->next_ = dummy_cfd_;
@@ -1545,8 +1502,7 @@ ColumnFamilyData* ColumnFamilySet::CreateColumnFamily(
  assert(column_families_.find(name) == column_families_.end());
  ColumnFamilyData* new_cfd = new ColumnFamilyData(
      id, name, dummy_versions, table_cache_, write_buffer_manager_, options,
-      *db_options_, &file_options_, this, block_cache_tracer_, io_tracer_,
-      db_session_id_);
+      *db_options_, file_options_, this, block_cache_tracer_, io_tracer_);
  column_families_.insert({name, id});
  column_family_data_.insert({id, new_cfd});
  max_column_family_ = std::max(max_column_family_, id);
@@ -44,7 +44,6 @@ class LogBuffer;
 class InstrumentedMutex;
 class InstrumentedMutexLock;
 struct SuperVersionContext;
-class BlobFileCache;

 extern const double kIncSlowdownRatio;
 // This file contains a list of data structures for managing column family
@@ -208,6 +207,8 @@ struct SuperVersion {
  uint64_t version_number;
  WriteStallCondition write_stall_condition;

+  InstrumentedMutex* db_mutex;
+
  // should be called outside the mutex
  SuperVersion() = default;
  ~SuperVersion();
@@ -251,12 +252,13 @@ extern Status CheckCFPathsSupported(const DBOptions& db_options,

 extern ColumnFamilyOptions SanitizeOptions(const ImmutableDBOptions& db_options,
                                           const ColumnFamilyOptions& src);
-// Wrap user defined table properties collector factories `from cf_options`
+// Wrap user defined table proproties collector factories `from cf_options`
 // into internal ones in int_tbl_prop_collector_factories. Add a system internal
 // one too.
 extern void GetIntTblPropCollectorFactory(
    const ImmutableCFOptions& ioptions,
-    IntTblPropCollectorFactories* int_tbl_prop_collector_factories);
+    std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+        int_tbl_prop_collector_factories);

 class ColumnFamilySet;

@@ -276,6 +278,17 @@ class ColumnFamilyData {
  // holding a DB mutex, or as the leader in a write batch group).
  void Ref() { refs_.fetch_add(1); }

+  // Unref decreases the reference count, but does not handle deletion
+  // when the count goes to 0.  If this method returns true then the
+  // caller should delete the instance immediately, or later, by calling
+  // FreeDeadColumnFamilies().  Unref() can only be called while holding
+  // a DB mutex, or during single-threaded recovery.
+  bool Unref() {
+    int old_refs = refs_.fetch_sub(1);
+    assert(old_refs > 0);
+    return old_refs == 1;
+  }
+
  // UnrefAndTryDelete() decreases the reference count and do free if needed,
  // return true if this is freed else false, UnrefAndTryDelete() can only
  // be called while holding a DB mutex, or during single-threaded recovery.
@@ -312,7 +325,7 @@ class ColumnFamilyData {
  FlushReason GetFlushReason() const { return flush_reason_; }
  // thread-safe
  const FileOptions* soptions() const;
-  const ImmutableOptions* ioptions() const { return &ioptions_; }
+  const ImmutableCFOptions* ioptions() const { return &ioptions_; }
  // REQUIRES: DB mutex held
  // This returns the MutableCFOptions used by current SuperVersion
  // You should use this API to reference MutableCFOptions most of the time.
@@ -346,18 +359,12 @@ class ColumnFamilyData {

  MemTableList* imm() { return &imm_; }
  MemTable* mem() { return mem_; }
-
-  bool IsEmpty() {
-    return mem()->GetFirstSequenceNumber() == 0 && imm()->NumNotFlushed() == 0;
-  }
-
  Version* current() { return current_; }
  Version* dummy_versions() { return dummy_versions_; }
  void SetCurrent(Version* _current);
  uint64_t GetNumLiveVersions() const;  // REQUIRE: DB mutex held
  uint64_t GetTotalSstFilesSize() const;  // REQUIRE: DB mutex held
  uint64_t GetLiveSstFilesSize() const;   // REQUIRE: DB mutex held
-  uint64_t GetTotalBlobFileSize() const;  // REQUIRE: DB mutex held
  void SetMemtable(MemTable* new_mem) {
    uint64_t memtable_id = last_memtable_id_.fetch_add(1) + 1;
    new_mem->SetID(memtable_id);
@@ -374,7 +381,6 @@ class ColumnFamilyData {
                         SequenceNumber earliest_seq);

  TableCache* table_cache() const { return table_cache_.get(); }
-  BlobFileCache* blob_file_cache() const { return blob_file_cache_.get(); }

  // See documentation in compaction_picker.h
  // REQUIRES: DB mutex held
@@ -398,8 +404,7 @@ class ColumnFamilyData {
  //
  // Thread-safe
  Status RangesOverlapWithMemtables(const autovector<Range>& ranges,
-                                    SuperVersion* super_version,
-                                    bool allow_data_in_errors, bool* overlap);
+                                    SuperVersion* super_version, bool* overlap);

  // A flag to tell a manual compaction is to compact all levels together
  // instead of a specific level.
@@ -425,7 +430,8 @@ class ColumnFamilyData {
    return internal_comparator_;
  }

-  const IntTblPropCollectorFactories* int_tbl_prop_collector_factories() const {
+  const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
+  int_tbl_prop_collector_factories() const {
    return &int_tbl_prop_collector_factories_;
  }

@@ -437,7 +443,7 @@ class ColumnFamilyData {
  // Get SuperVersion stored in thread local storage. If it does not exist,
  // get a reference from a current SuperVersion.
  SuperVersion* GetThreadLocalSuperVersion(DBImpl* db);
-  // Try to return SuperVersion back to thread local storage. Return true on
+  // Try to return SuperVersion back to thread local storage. Retrun true on
  // success and false on failure. It fails when the thread local storage
  // contains anything other than SuperVersion::kSVInUse flag.
  bool ReturnThreadLocalSuperVersion(SuperVersion* sv);
@@ -451,6 +457,7 @@ class ColumnFamilyData {
  // the clients to allocate SuperVersion outside of mutex.
  // IMPORTANT: Only call this from DBImpl::InstallSuperVersion()
  void InstallSuperVersion(SuperVersionContext* sv_context,
+                           InstrumentedMutex* db_mutex,
                           const MutableCFOptions& mutable_cf_options);
  void InstallSuperVersion(SuperVersionContext* sv_context,
                           InstrumentedMutex* db_mutex);
@@ -470,11 +477,9 @@ class ColumnFamilyData {
    kPendingCompactionBytes,
  };
  static std::pair<WriteStallCondition, WriteStallCause>
-  GetWriteStallConditionAndCause(
-      int num_unflushed_memtables, int num_l0_files,
-      uint64_t num_compaction_needed_bytes,
-      const MutableCFOptions& mutable_cf_options,
-      const ImmutableCFOptions& immutable_cf_options);
+  GetWriteStallConditionAndCause(int num_unflushed_memtables, int num_l0_files,
+                                 uint64_t num_compaction_needed_bytes,
+                                 const MutableCFOptions& mutable_cf_options);

  // Recalculate some small conditions, which are changed only during
  // compaction, adding new memtable and/or
@@ -501,23 +506,7 @@ class ColumnFamilyData {

  FSDirectory* GetDataDir(size_t path_id) const;

-  // full_history_ts_low_ can only increase.
-  void SetFullHistoryTsLow(std::string ts_low) {
-    assert(!ts_low.empty());
-    const Comparator* ucmp = user_comparator();
-    assert(ucmp);
-    if (full_history_ts_low_.empty() ||
-        ucmp->CompareTimestamp(ts_low, full_history_ts_low_) > 0) {
-      full_history_ts_low_ = std::move(ts_low);
-    }
-  }
-
-  const std::string& GetFullHistoryTsLow() const {
-    return full_history_ts_low_;
-  }
-
  ThreadLocalPtr* TEST_GetLocalSV() { return local_sv_.get(); }
-  WriteBufferManager* write_buffer_mgr() { return write_buffer_manager_; }

 private:
  friend class ColumnFamilySet;
@@ -527,11 +516,10 @@ class ColumnFamilyData {
                   WriteBufferManager* write_buffer_manager,
                   const ColumnFamilyOptions& options,
                   const ImmutableDBOptions& db_options,
-                   const FileOptions* file_options,
+                   const FileOptions& file_options,
                   ColumnFamilySet* column_family_set,
                   BlockCacheTracer* const block_cache_tracer,
-                   const std::shared_ptr<IOTracer>& io_tracer,
-                   const std::string& db_session_id);
+                   const std::shared_ptr<IOTracer>& io_tracer);

  std::vector<std::string> GetDbPaths() const;

@@ -545,16 +533,16 @@ class ColumnFamilyData {
  std::atomic<bool> dropped_;  // true if client dropped it

  const InternalKeyComparator internal_comparator_;
-  IntTblPropCollectorFactories int_tbl_prop_collector_factories_;
+  std::vector<std::unique_ptr<IntTblPropCollectorFactory>>
+      int_tbl_prop_collector_factories_;

  const ColumnFamilyOptions initial_cf_options_;
-  const ImmutableOptions ioptions_;
+  const ImmutableCFOptions ioptions_;
  MutableCFOptions mutable_cf_options_;

  const bool is_delete_range_supported_;

  std::unique_ptr<TableCache> table_cache_;
-  std::unique_ptr<BlobFileCache> blob_file_cache_;

  std::unique_ptr<InternalStats> internal_stats_;

@@ -613,8 +601,6 @@ class ColumnFamilyData {
  std::vector<std::shared_ptr<FSDirectory>> data_dirs_;

  bool db_paths_registered_;
-
-  std::string full_history_ts_low_;
 };

 // ColumnFamilySet has interesting thread-safety requirements
@@ -667,8 +653,7 @@ class ColumnFamilySet {
                  WriteBufferManager* _write_buffer_manager,
                  WriteController* _write_controller,
                  BlockCacheTracer* const block_cache_tracer,
-                  const std::shared_ptr<IOTracer>& io_tracer,
-                  const std::string& db_session_id);
+                  const std::shared_ptr<IOTracer>& io_tracer);
  ~ColumnFamilySet();

  ColumnFamilyData* GetDefault() const;
@@ -718,8 +703,6 @@ class ColumnFamilySet {
  std::unordered_map<uint32_t, ColumnFamilyData*> column_family_data_;

  uint32_t max_column_family_;
-  const FileOptions file_options_;
-
  ColumnFamilyData* dummy_cfd_;
  // We don't hold the refcount here, since default column family always exists
  // We are also not responsible for cleaning up default_cfd_cache_. This is
@@ -729,12 +712,12 @@ class ColumnFamilySet {

  const std::string db_name_;
  const ImmutableDBOptions* const db_options_;
+  const FileOptions file_options_;
  Cache* table_cache_;
  WriteBufferManager* write_buffer_manager_;
  WriteController* write_controller_;
  BlockCacheTracer* const block_cache_tracer_;
  std::shared_ptr<IOTracer> io_tracer_;
-  std::string db_session_id_;
 };

 // We use ColumnFamilyMemTablesImpl to provide WriteBatch a way to access
@@ -35,10 +35,10 @@ namespace ROCKSDB_NAMESPACE {
 static const int kValueSize = 1000;

 // counts how many operations were performed
-class EnvCounter : public SpecialEnv {
+class EnvCounter : public EnvWrapper {
 public:
  explicit EnvCounter(Env* base)
-      : SpecialEnv(base), num_new_writable_file_(0) {}
+      : EnvWrapper(base), num_new_writable_file_(0) {}
  int GetNumberOfNewWritableFileCalls() {
    return num_new_writable_file_;
  }
@@ -56,16 +56,23 @@ class ColumnFamilyTestBase : public testing::Test {
 public:
  explicit ColumnFamilyTestBase(uint32_t format) : rnd_(139), format_(format) {
    Env* base_env = Env::Default();
-    EXPECT_OK(
-        test::CreateEnvFromSystem(ConfigOptions(), &base_env, &env_guard_));
+#ifndef ROCKSDB_LITE
+    const char* test_env_uri = getenv("TEST_ENV_URI");
+    if (test_env_uri) {
+      Env* test_env = nullptr;
+      Status s = Env::LoadEnv(test_env_uri, &test_env, &env_guard_);
+      base_env = test_env;
+      EXPECT_OK(s);
+      EXPECT_NE(Env::Default(), base_env);
+    }
+#endif  // !ROCKSDB_LITE
    EXPECT_NE(nullptr, base_env);
    env_ = new EnvCounter(base_env);
-    env_->skip_fsync_ = true;
    dbname_ = test::PerThreadDBPath("column_family_test");
    db_options_.create_if_missing = true;
    db_options_.fail_if_options_file_error = true;
    db_options_.env = env_;
-    EXPECT_OK(DestroyDB(dbname_, Options(db_options_, column_family_options_)));
+    DestroyDB(dbname_, Options(db_options_, column_family_options_));
  }

  ~ColumnFamilyTestBase() override {
@@ -80,6 +87,7 @@ class ColumnFamilyTestBase : public testing::Test {
 #endif  // ROCKSDB_LITE
      column_families.push_back(cfdescriptor);
    }
+    Close();
    ROCKSDB_NAMESPACE::SyncPoint::GetInstance()->DisableProcessing();
    Destroy(column_families);
    delete env_;
@@ -179,8 +187,8 @@ class ColumnFamilyTestBase : public testing::Test {
    std::vector<ColumnFamilyDescriptor> column_families;
    names_.clear();
    for (size_t i = 0; i < cf.size(); ++i) {
-      column_families.emplace_back(
-          cf[i], options.size() == 0 ? column_family_options_ : options[i]);
+      column_families.push_back(ColumnFamilyDescriptor(
+          cf[i], options.size() == 0 ? column_family_options_ : options[i]));
      names_.push_back(cf[i]);
    }
    return DB::Open(db_options_, dbname_, column_families, &handles_, &db_);
@@ -191,8 +199,8 @@ class ColumnFamilyTestBase : public testing::Test {
    std::vector<ColumnFamilyDescriptor> column_families;
    names_.clear();
    for (size_t i = 0; i < cf.size(); ++i) {
-      column_families.emplace_back(
-          cf[i], options.size() == 0 ? column_family_options_ : options[i]);
+      column_families.push_back(ColumnFamilyDescriptor(
+          cf[i], options.size() == 0 ? column_family_options_ : options[i]));
      names_.push_back(cf[i]);
    }
    return DB::OpenForReadOnly(db_options_, dbname_, column_families, &handles_,
@@ -645,8 +653,8 @@ TEST_P(FlushEmptyCFTestWithParam, FlushEmptyCFTest) {
  // after flushing file B is deleted. At the same time, the min log number of
  // default CF is not written to manifest. Log file A still remains.
  // Flushed to SST file Y.
-  ASSERT_OK(Flush(1));
-  ASSERT_OK(Flush(0));
+  Flush(1);
+  Flush(0);
  ASSERT_OK(Put(1, "bar", "v3"));  // seqID 4
  ASSERT_OK(Put(1, "foo", "v4"));  // seqID 5
  ASSERT_OK(db_->FlushWAL(/*sync=*/false));
@@ -700,15 +708,15 @@ TEST_P(FlushEmptyCFTestWithParam, FlushEmptyCFTest2) {
  // and is set to current. Both CFs' min log number is set to file C so after
  // flushing file B is deleted. Log file A still remains.
  // Flushed to SST file Y.
-  ASSERT_OK(Flush(1));
+  Flush(1);
  ASSERT_OK(Put(0, "bar", "v2"));  // seqID 4
  ASSERT_OK(Put(2, "bar", "v2"));  // seqID 5
  ASSERT_OK(Put(1, "bar", "v3"));  // seqID 6
  // Flushing all column families. This forces all CFs' min log to current. This
  // is written to the manifest file. Log file C is cleared.
-  ASSERT_OK(Flush(0));
-  ASSERT_OK(Flush(1));
-  ASSERT_OK(Flush(2));
+  Flush(0);
+  Flush(1);
+  Flush(2);
  // Write to log file D
  ASSERT_OK(Put(1, "bar", "v4"));  // seqID 7
  ASSERT_OK(Put(1, "bar", "v5"));  // seqID 8
@@ -890,7 +898,9 @@ TEST_P(ColumnFamilyTest, IgnoreRecoveredLog) {
  std::vector<std::string> old_files;
  ASSERT_OK(env_->GetChildren(backup_logs, &old_files));
  for (auto& file : old_files) {
-    ASSERT_OK(env_->DeleteFile(backup_logs + "/" + file));
+    if (file != "." && file != "..") {
+      ASSERT_OK(env_->DeleteFile(backup_logs + "/" + file));
+    }
  }

  column_family_options_.merge_operator =
@@ -919,7 +929,9 @@ TEST_P(ColumnFamilyTest, IgnoreRecoveredLog) {
  std::vector<std::string> logs;
  ASSERT_OK(env_->GetChildren(db_options_.wal_dir, &logs));
  for (auto& log : logs) {
-    CopyFile(db_options_.wal_dir + "/" + log, backup_logs + "/" + log);
+    if (log != ".." && log != ".") {
+      CopyFile(db_options_.wal_dir + "/" + log, backup_logs + "/" + log);
+    }
  }

  // recover the DB
@@ -944,7 +956,9 @@ TEST_P(ColumnFamilyTest, IgnoreRecoveredLog) {
    if (iter == 0) {
      // copy the logs from backup back to wal dir
      for (auto& log : logs) {
-        CopyFile(backup_logs + "/" + log, db_options_.wal_dir + "/" + log);
+        if (log != ".." && log != ".") {
+          CopyFile(backup_logs + "/" + log, db_options_.wal_dir + "/" + log);
+        }
      }
    }
  }
@@ -971,7 +985,7 @@ TEST_P(ColumnFamilyTest, FlushTest) {
    for (int i = 0; i < 3; ++i) {
      uint64_t max_total_in_memory_state =
          MaxTotalInMemoryState();
-      ASSERT_OK(Flush(i));
+      Flush(i);
      AssertMaxTotalInMemoryState(max_total_in_memory_state);
    }
    ASSERT_OK(Put(1, "foofoo", "bar"));
@@ -1079,7 +1093,7 @@ TEST_P(ColumnFamilyTest, CrashAfterFlush) {
  ASSERT_OK(batch.Put(handles_[0], Slice("foo"), Slice("bar")));
  ASSERT_OK(batch.Put(handles_[1], Slice("foo"), Slice("bar")));
  ASSERT_OK(db_->Write(WriteOptions(), &batch));
-  ASSERT_OK(Flush(0));
+  Flush(0);
  fault_env->SetFilesystemActive(false);

  std::vector<std::string> names;
@@ -1089,7 +1103,7 @@ TEST_P(ColumnFamilyTest, CrashAfterFlush) {
    }
  }
  Close();
-  ASSERT_OK(fault_env->DropUnsyncedFileData());
+  fault_env->DropUnsyncedFileData();
  fault_env->ResetState();
  Open(names, {});

@@ -2222,7 +2236,7 @@ TEST_P(ColumnFamilyTest, FlushStaleColumnFamilies) {
  // files for column family [one], because it's empty
  AssertCountLiveFiles(4);

-  ASSERT_OK(Flush(0));
+  Flush(0);
  ASSERT_EQ(0, dbfull()->TEST_total_log_size());
  Close();
 }
@@ -2278,8 +2292,6 @@ TEST_P(ColumnFamilyTest, SanitizeOptions) {
              // not a multiple of 4k, round up 4k
              expected_arena_block_size += 4 * 1024;
            }
-            expected_arena_block_size =
-                std::min(size_t{1024 * 1024}, expected_arena_block_size);
            ASSERT_EQ(expected_arena_block_size, result.arena_block_size);
          }
        }
@@ -2975,8 +2987,7 @@ TEST_P(ColumnFamilyTest, FlushCloseWALFiles) {
  SpecialEnv env(Env::Default());
  db_options_.env = &env;
  db_options_.max_background_flushes = 1;
-  column_family_options_.memtable_factory.reset(
-      test::NewSpecialSkipListFactory(2));
+  column_family_options_.memtable_factory.reset(new SpecialSkipListFactory(2));
  Open();
  CreateColumnFamilies({"one"});
  ASSERT_OK(Put(1, "fodor", "mirko"));
@@ -3021,8 +3032,7 @@ TEST_P(ColumnFamilyTest, IteratorCloseWALFile1) {
  SpecialEnv env(Env::Default());
  db_options_.env = &env;
  db_options_.max_background_flushes = 1;
-  column_family_options_.memtable_factory.reset(
-      test::NewSpecialSkipListFactory(2));
+  column_family_options_.memtable_factory.reset(new SpecialSkipListFactory(2));
  Open();
  CreateColumnFamilies({"one"});
  ASSERT_OK(Put(1, "fodor", "mirko"));
@@ -3030,7 +3040,7 @@ TEST_P(ColumnFamilyTest, IteratorCloseWALFile1) {
  Iterator* it = db_->NewIterator(ReadOptions(), handles_[1]);
  ASSERT_OK(it->status());
  // A flush will make `it` hold the last reference of its super version.
-  ASSERT_OK(Flush(1));
+  Flush(1);

  ASSERT_OK(Put(1, "fodor", "mirko"));
  ASSERT_OK(Put(0, "fodor", "mirko"));
@@ -3073,8 +3083,7 @@ TEST_P(ColumnFamilyTest, IteratorCloseWALFile2) {
  env.SetBackgroundThreads(2, Env::HIGH);
  db_options_.env = &env;
  db_options_.max_background_flushes = 1;
-  column_family_options_.memtable_factory.reset(
-      test::NewSpecialSkipListFactory(2));
+  column_family_options_.memtable_factory.reset(new SpecialSkipListFactory(2));
  Open();
  CreateColumnFamilies({"one"});
  ASSERT_OK(Put(1, "fodor", "mirko"));
@@ -3084,7 +3093,7 @@ TEST_P(ColumnFamilyTest, IteratorCloseWALFile2) {
  Iterator* it = db_->NewIterator(ro, handles_[1]);
  ASSERT_OK(it->status());
  // A flush will make `it` hold the last reference of its super version.
-  ASSERT_OK(Flush(1));
+  Flush(1);

  ASSERT_OK(Put(1, "fodor", "mirko"));
  ASSERT_OK(Put(0, "fodor", "mirko"));
@@ -3132,14 +3141,13 @@ TEST_P(ColumnFamilyTest, ForwardIteratorCloseWALFile) {
  env.SetBackgroundThreads(2, Env::HIGH);
  db_options_.env = &env;
  db_options_.max_background_flushes = 1;
-  column_family_options_.memtable_factory.reset(
-      test::NewSpecialSkipListFactory(3));
+  column_family_options_.memtable_factory.reset(new SpecialSkipListFactory(3));
  column_family_options_.level0_file_num_compaction_trigger = 2;
  Open();
  CreateColumnFamilies({"one"});
  ASSERT_OK(Put(1, "fodor", "mirko"));
  ASSERT_OK(Put(1, "fodar2", "mirko"));
-  ASSERT_OK(Flush(1));
+  Flush(1);

  // Create an iterator holding the current super version, as well as
  // the SST file just flushed.
@@ -3151,7 +3159,7 @@ TEST_P(ColumnFamilyTest, ForwardIteratorCloseWALFile) {

  ASSERT_OK(Put(1, "fodor", "mirko"));
  ASSERT_OK(Put(1, "fodar2", "mirko"));
-  ASSERT_OK(Flush(1));
+  Flush(1);

  WaitForCompaction();

@@ -3224,9 +3232,9 @@ TEST_P(ColumnFamilyTest, LogSyncConflictFlush) {
  ROCKSDB_NAMESPACE::port::Thread thread([&] { ASSERT_OK(db_->SyncWAL()); });

  TEST_SYNC_POINT("ColumnFamilyTest::LogSyncConflictFlush:1");
-  ASSERT_OK(Flush(1));
+  Flush(1);
  ASSERT_OK(Put(1, "foo", "bar"));
-  ASSERT_OK(Flush(1));
+  Flush(1);

  TEST_SYNC_POINT("ColumnFamilyTest::LogSyncConflictFlush:2");

@@ -3248,7 +3256,7 @@ TEST_P(ColumnFamilyTest, DISABLED_LogTruncationTest) {
  Build(0, 100);

  // Flush the 0th column family to force a roll of the wal log
-  ASSERT_OK(Flush(0));
+  Flush(0);

  // Add some more entries
  Build(100, 100);
@@ -3263,7 +3271,7 @@ TEST_P(ColumnFamilyTest, DISABLED_LogTruncationTest) {
    FileType type;
    if (!(ParseFileName(filenames[i], &number, &type))) continue;

-    if (type != kWalFile) continue;
+    if (type != kLogFile) continue;

    logfs.push_back(filenames[i]);
  }
@@ -3324,14 +3332,14 @@ TEST_P(ColumnFamilyTest, DefaultCfPathsTest) {

  // Fill Column family 1.
  PutRandomData(1, 100, 100);
-  ASSERT_OK(Flush(1));
+  Flush(1);

  ASSERT_EQ(1, GetSstFileCount(cf_opt1.cf_paths[0].path));
  ASSERT_EQ(0, GetSstFileCount(dbname_));

  // Fill column family 2
  PutRandomData(2, 100, 100);
-  ASSERT_OK(Flush(2));
+  Flush(2);

  // SST from Column family 2 should be generated in
  // db_paths which is dbname_ in this case.
@@ -3350,14 +3358,14 @@ TEST_P(ColumnFamilyTest, MultipleCFPathsTest) {
  Reopen({ColumnFamilyOptions(), cf_opt1, cf_opt2});

  PutRandomData(1, 100, 100, true /* save */);
-  ASSERT_OK(Flush(1));
+  Flush(1);

  // Check that files are generated in appropriate paths.
  ASSERT_EQ(1, GetSstFileCount(cf_opt1.cf_paths[0].path));
  ASSERT_EQ(0, GetSstFileCount(dbname_));

  PutRandomData(2, 100, 100, true /* save */);
-  ASSERT_OK(Flush(2));
+  Flush(2);

  ASSERT_EQ(1, GetSstFileCount(cf_opt2.cf_paths[0].path));
  ASSERT_EQ(0, GetSstFileCount(dbname_));
@@ -3383,56 +3391,16 @@ TEST_P(ColumnFamilyTest, MultipleCFPathsTest) {
  }
 }

-TEST(ColumnFamilyTest, ValidateBlobGCCutoff) {
-  DBOptions db_options;
-
-  ColumnFamilyOptions cf_options;
-  cf_options.enable_blob_garbage_collection = true;
-
-  cf_options.blob_garbage_collection_age_cutoff = -0.5;
-  ASSERT_TRUE(ColumnFamilyData::ValidateOptions(db_options, cf_options)
-                  .IsInvalidArgument());
-
-  cf_options.blob_garbage_collection_age_cutoff = 0.0;
-  ASSERT_OK(ColumnFamilyData::ValidateOptions(db_options, cf_options));
-
-  cf_options.blob_garbage_collection_age_cutoff = 0.5;
-  ASSERT_OK(ColumnFamilyData::ValidateOptions(db_options, cf_options));
-
-  cf_options.blob_garbage_collection_age_cutoff = 1.0;
-  ASSERT_OK(ColumnFamilyData::ValidateOptions(db_options, cf_options));
-
-  cf_options.blob_garbage_collection_age_cutoff = 1.5;
-  ASSERT_TRUE(ColumnFamilyData::ValidateOptions(db_options, cf_options)
-                  .IsInvalidArgument());
-}
-
-TEST(ColumnFamilyTest, ValidateBlobGCForceThreshold) {
-  DBOptions db_options;
-
-  ColumnFamilyOptions cf_options;
-  cf_options.enable_blob_garbage_collection = true;
-
-  cf_options.blob_garbage_collection_force_threshold = -0.5;
-  ASSERT_TRUE(ColumnFamilyData::ValidateOptions(db_options, cf_options)
-                  .IsInvalidArgument());
-
-  cf_options.blob_garbage_collection_force_threshold = 0.0;
-  ASSERT_OK(ColumnFamilyData::ValidateOptions(db_options, cf_options));
-
-  cf_options.blob_garbage_collection_force_threshold = 0.5;
-  ASSERT_OK(ColumnFamilyData::ValidateOptions(db_options, cf_options));
-
-  cf_options.blob_garbage_collection_force_threshold = 1.0;
-  ASSERT_OK(ColumnFamilyData::ValidateOptions(db_options, cf_options));
-
-  cf_options.blob_garbage_collection_force_threshold = 1.5;
-  ASSERT_TRUE(ColumnFamilyData::ValidateOptions(db_options, cf_options)
-                  .IsInvalidArgument());
-}
-
 }  // namespace ROCKSDB_NAMESPACE

+#ifdef ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS
+extern "C" {
+void RegisterCustomObjects(int argc, char** argv);
+}
+#else
+void RegisterCustomObjects(int /*argc*/, char** /*argv*/) {}
+#endif  // !ROCKSDB_UNITTESTS_WITH_CUSTOM_OBJECTS_FROM_STATIC_LIBS
+
 int main(int argc, char** argv) {
  ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
  ::testing::InitGoogleTest(&argc, argv);
@@ -91,9 +91,9 @@ TEST_F(CompactFilesTest, L0ConflictsFiles) {
  // create couple files
  // Background compaction starts and waits in BackgroundCallCompaction:0
  for (int i = 0; i < kLevel0Trigger * 4; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), ToString(i), ""));
-    ASSERT_OK(db->Put(WriteOptions(), ToString(100 - i), ""));
-    ASSERT_OK(db->Flush(FlushOptions()));
+    db->Put(WriteOptions(), ToString(i), "");
+    db->Put(WriteOptions(), ToString(100 - i), "");
+    db->Flush(FlushOptions());
  }

  ROCKSDB_NAMESPACE::ColumnFamilyMetaData meta;
@@ -118,78 +118,6 @@ TEST_F(CompactFilesTest, L0ConflictsFiles) {
  delete db;
 }

-TEST_F(CompactFilesTest, MultipleLevel) {
-  Options options;
-  options.create_if_missing = true;
-  options.level_compaction_dynamic_level_bytes = true;
-  options.num_levels = 6;
-  // Add listener
-  FlushedFileCollector* collector = new FlushedFileCollector();
-  options.listeners.emplace_back(collector);
-
-  DB* db = nullptr;
-  DestroyDB(db_name_, options);
-  Status s = DB::Open(options, db_name_, &db);
-  ASSERT_OK(s);
-  ASSERT_NE(db, nullptr);
-
-  // create couple files in L0, L3, L4 and L5
-  for (int i = 5; i > 2; --i) {
-    collector->ClearFlushedFiles();
-    ASSERT_OK(db->Put(WriteOptions(), ToString(i), ""));
-    ASSERT_OK(db->Flush(FlushOptions()));
-    auto l0_files = collector->GetFlushedFiles();
-    ASSERT_OK(db->CompactFiles(CompactionOptions(), l0_files, i));
-
-    std::string prop;
-    ASSERT_TRUE(
-        db->GetProperty("rocksdb.num-files-at-level" + ToString(i), &prop));
-    ASSERT_EQ("1", prop);
-  }
-  ASSERT_OK(db->Put(WriteOptions(), ToString(0), ""));
-  ASSERT_OK(db->Flush(FlushOptions()));
-
-  ColumnFamilyMetaData meta;
-  db->GetColumnFamilyMetaData(&meta);
-  // Compact files except the file in L3
-  std::vector<std::string> files;
-  for (int i = 0; i < 6; ++i) {
-    if (i == 3) continue;
-    for (auto& file : meta.levels[i].files) {
-      files.push_back(file.db_path + "/" + file.name);
-    }
-  }
-
-  SyncPoint::GetInstance()->LoadDependency({
-      {"CompactionJob::Run():Start", "CompactFilesTest.MultipleLevel:0"},
-      {"CompactFilesTest.MultipleLevel:1", "CompactFilesImpl:3"},
-  });
-  SyncPoint::GetInstance()->EnableProcessing();
-
-  std::thread thread([&] {
-    TEST_SYNC_POINT("CompactFilesTest.MultipleLevel:0");
-    ASSERT_OK(db->Put(WriteOptions(), "bar", "v2"));
-    ASSERT_OK(db->Put(WriteOptions(), "foo", "v2"));
-    ASSERT_OK(db->Flush(FlushOptions()));
-    TEST_SYNC_POINT("CompactFilesTest.MultipleLevel:1");
-  });
-
-  // Compaction cannot move up the data to higher level
-  // here we have input file from level 5, so the output level has to be >= 5
-  for (int invalid_output_level = 0; invalid_output_level < 5;
-       invalid_output_level++) {
-    s = db->CompactFiles(CompactionOptions(), files, invalid_output_level);
-    std::cout << s.ToString() << std::endl;
-    ASSERT_TRUE(s.IsInvalidArgument());
-  }
-
-  ASSERT_OK(db->CompactFiles(CompactionOptions(), files, 5));
-  SyncPoint::GetInstance()->DisableProcessing();
-  thread.join();
-
-  delete db;
-}
-
 TEST_F(CompactFilesTest, ObsoleteFiles) {
  Options options;
  // to trigger compaction more easily
@@ -210,18 +138,18 @@ TEST_F(CompactFilesTest, ObsoleteFiles) {
  DB* db = nullptr;
  DestroyDB(db_name_, options);
  Status s = DB::Open(options, db_name_, &db);
-  ASSERT_OK(s);
-  ASSERT_NE(db, nullptr);
+  assert(s.ok());
+  assert(db);

  // create couple files
  for (int i = 1000; i < 2000; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), ToString(i),
-                      std::string(kWriteBufferSize / 10, 'a' + (i % 26))));
+    db->Put(WriteOptions(), ToString(i),
+            std::string(kWriteBufferSize / 10, 'a' + (i % 26)));
  }

  auto l0_files = collector->GetFlushedFiles();
  ASSERT_OK(db->CompactFiles(CompactionOptions(), l0_files, 1));
-  ASSERT_OK(static_cast_with_check<DBImpl>(db)->TEST_WaitForCompact());
+  static_cast_with_check<DBImpl>(db)->TEST_WaitForCompact();

  // verify all compaction input files are deleted
  for (auto fname : l0_files) {
@@ -254,17 +182,15 @@ TEST_F(CompactFilesTest, NotCutOutputOnLevel0) {

  // create couple files
  for (int i = 0; i < 500; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), ToString(i),
-                      std::string(1000, 'a' + (i % 26))));
+    db->Put(WriteOptions(), ToString(i), std::string(1000, 'a' + (i % 26)));
  }
-  ASSERT_OK(static_cast_with_check<DBImpl>(db)->TEST_WaitForFlushMemTable());
+  static_cast_with_check<DBImpl>(db)->TEST_WaitForFlushMemTable();
  auto l0_files_1 = collector->GetFlushedFiles();
  collector->ClearFlushedFiles();
  for (int i = 0; i < 500; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), ToString(i),
-                      std::string(1000, 'a' + (i % 26))));
+    db->Put(WriteOptions(), ToString(i), std::string(1000, 'a' + (i % 26)));
  }
-  ASSERT_OK(static_cast_with_check<DBImpl>(db)->TEST_WaitForFlushMemTable());
+  static_cast_with_check<DBImpl>(db)->TEST_WaitForFlushMemTable();
  auto l0_files_2 = collector->GetFlushedFiles();
  ASSERT_OK(db->CompactFiles(CompactionOptions(), l0_files_1, 0));
  ASSERT_OK(db->CompactFiles(CompactionOptions(), l0_files_2, 0));
@@ -287,13 +213,13 @@ TEST_F(CompactFilesTest, CapturingPendingFiles) {
  DB* db = nullptr;
  DestroyDB(db_name_, options);
  Status s = DB::Open(options, db_name_, &db);
-  ASSERT_OK(s);
+  assert(s.ok());
  assert(db);

  // Create 5 files.
  for (int i = 0; i < 5; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), "key" + ToString(i), "value"));
-    ASSERT_OK(db->Flush(FlushOptions()));
+    db->Put(WriteOptions(), "key" + ToString(i), "value");
+    db->Flush(FlushOptions());
  }

  auto l0_files = collector->GetFlushedFiles();
@@ -311,8 +237,8 @@ TEST_F(CompactFilesTest, CapturingPendingFiles) {

  // In the meantime flush another file.
  TEST_SYNC_POINT("CompactFilesTest.CapturingPendingFiles:0");
-  ASSERT_OK(db->Put(WriteOptions(), "key5", "value"));
-  ASSERT_OK(db->Flush(FlushOptions()));
+  db->Put(WriteOptions(), "key5", "value");
+  db->Flush(FlushOptions());
  TEST_SYNC_POINT("CompactFilesTest.CapturingPendingFiles:1");

  compaction_thread.join();
@@ -323,7 +249,7 @@ TEST_F(CompactFilesTest, CapturingPendingFiles) {

  // Make sure we can reopen the DB.
  s = DB::Open(options, db_name_, &db);
-  ASSERT_OK(s);
+  ASSERT_TRUE(s.ok());
  assert(db);
  delete db;
 }
@@ -367,8 +293,8 @@ TEST_F(CompactFilesTest, CompactionFilterWithGetSv) {
  cf->SetDB(db);

  // Write one L0 file
-  ASSERT_OK(db->Put(WriteOptions(), "K1", "V1"));
-  ASSERT_OK(db->Flush(FlushOptions()));
+  db->Put(WriteOptions(), "K1", "V1");
+  db->Flush(FlushOptions());

  // Compact all L0 files using CompactFiles
  ROCKSDB_NAMESPACE::ColumnFamilyMetaData meta;
@@ -411,8 +337,8 @@ TEST_F(CompactFilesTest, SentinelCompressionType) {
    DB* db = nullptr;
    ASSERT_OK(DB::Open(options, db_name_, &db));

-    ASSERT_OK(db->Put(WriteOptions(), "key", "val"));
-    ASSERT_OK(db->Flush(FlushOptions()));
+    db->Put(WriteOptions(), "key", "val");
+    db->Flush(FlushOptions());

    auto l0_files = collector->GetFlushedFiles();
    ASSERT_EQ(1, l0_files.size());
@@ -451,15 +377,14 @@ TEST_F(CompactFilesTest, GetCompactionJobInfo) {
  DB* db = nullptr;
  DestroyDB(db_name_, options);
  Status s = DB::Open(options, db_name_, &db);
-  ASSERT_OK(s);
+  assert(s.ok());
  assert(db);

  // create couple files
  for (int i = 0; i < 500; ++i) {
-    ASSERT_OK(db->Put(WriteOptions(), ToString(i),
-                      std::string(1000, 'a' + (i % 26))));
+    db->Put(WriteOptions(), ToString(i), std::string(1000, 'a' + (i % 26)));
  }
-  ASSERT_OK(static_cast_with_check<DBImpl>(db)->TEST_WaitForFlushMemTable());
+  static_cast_with_check<DBImpl>(db)->TEST_WaitForFlushMemTable();
  auto l0_files_1 = collector->GetFlushedFiles();
  CompactionOptions co;
  co.compression = CompressionType::kLZ4Compression;
@@ -4,11 +4,10 @@
 //  (found in the LICENSE.Apache file in the root directory).

 #ifndef ROCKSDB_LITE
-#include "db/db_impl/compacted_db_impl.h"
+#include "db/compacted_db_impl.h"

 #include "db/db_impl/db_impl.h"
 #include "db/version_set.h"
-#include "logging/logging.h"
 #include "table/get_context.h"
 #include "util/cast_util.h"

@@ -18,13 +17,11 @@ extern void MarkKeyMayExist(void* arg);
 extern bool SaveValue(void* arg, const ParsedInternalKey& parsed_key,
                      const Slice& v, bool hit_and_return);

-CompactedDBImpl::CompactedDBImpl(const DBOptions& options,
-                                 const std::string& dbname)
-    : DBImpl(options, dbname, /*seq_per_batch*/ false, +/*batch_per_txn*/ true,
-             /*read_only*/ true),
-      cfd_(nullptr),
-      version_(nullptr),
-      user_comparator_(nullptr) {}
+CompactedDBImpl::CompactedDBImpl(
+  const DBOptions& options, const std::string& dbname)
+  : DBImpl(options, dbname), cfd_(nullptr), version_(nullptr),
+    user_comparator_(nullptr) {
+}

 CompactedDBImpl::~CompactedDBImpl() {
 }
@@ -81,7 +78,6 @@ std::vector<Status> CompactedDBImpl::MultiGet(const ReadOptions& options,
                             nullptr, nullptr, nullptr, true, nullptr, nullptr);
      LookupKey lkey(keys[idx], kMaxSequenceNumber);
      Status s = r->Get(options, lkey.internal_key(), &get_context, nullptr);
-      assert(static_cast<size_t>(idx) < statuses.size());
      if (!s.ok() && !s.IsNotFound()) {
        statuses[idx] = s;
      } else {
@@ -18,7 +18,7 @@ class CompactedDBImpl : public DBImpl {
  CompactedDBImpl(const CompactedDBImpl&) = delete;
  void operator=(const CompactedDBImpl&) = delete;

-  ~CompactedDBImpl() override;
+  virtual ~CompactedDBImpl();

  static Status Open(const Options& options, const std::string& dbname,
                     DB** dbptr);
@@ -82,11 +82,6 @@ class CompactedDBImpl : public DBImpl {
                       ColumnFamilyHandle* /*column_family*/) override {
    return Status::NotSupported("Not supported in compacted db mode.");
  }
-
-  virtual Status SyncWAL() override {
-    return Status::NotSupported("Not supported in compacted db mode.");
-  }
-
  using DB::IngestExternalFile;
  virtual Status IngestExternalFile(
      ColumnFamilyHandle* /*column_family*/,
@@ -1,275 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#pragma once
-
-#include <cassert>
-
-#include "table/internal_iterator.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// An internal iterator that wraps another one and ensures that any keys
-// returned are strictly within a range [start, end). If the underlying
-// iterator has already performed the bounds checking, it relies on that result;
-// otherwise, it performs the necessary key comparisons itself. Both bounds
-// are optional.
-class ClippingIterator : public InternalIterator {
- public:
-  ClippingIterator(InternalIterator* iter, const Slice* start, const Slice* end,
-                   const Comparator* cmp)
-      : iter_(iter), start_(start), end_(end), cmp_(cmp), valid_(false) {
-    assert(iter_);
-    assert(cmp_);
-    assert(!start_ || !end_ || cmp_->Compare(*start_, *end_) <= 0);
-
-    UpdateAndEnforceBounds();
-  }
-
-  bool Valid() const override { return valid_; }
-
-  void SeekToFirst() override {
-    if (start_) {
-      iter_->Seek(*start_);
-    } else {
-      iter_->SeekToFirst();
-    }
-
-    UpdateAndEnforceUpperBound();
-  }
-
-  void SeekToLast() override {
-    if (end_) {
-      iter_->SeekForPrev(*end_);
-
-      // Upper bound is exclusive, so we need a key which is strictly smaller
-      if (iter_->Valid() && cmp_->Compare(iter_->key(), *end_) == 0) {
-        iter_->Prev();
-      }
-    } else {
-      iter_->SeekToLast();
-    }
-
-    UpdateAndEnforceLowerBound();
-  }
-
-  void Seek(const Slice& target) override {
-    if (start_ && cmp_->Compare(target, *start_) < 0) {
-      iter_->Seek(*start_);
-      UpdateAndEnforceUpperBound();
-      return;
-    }
-
-    if (end_ && cmp_->Compare(target, *end_) >= 0) {
-      valid_ = false;
-      return;
-    }
-
-    iter_->Seek(target);
-    UpdateAndEnforceUpperBound();
-  }
-
-  void SeekForPrev(const Slice& target) override {
-    if (start_ && cmp_->Compare(target, *start_) < 0) {
-      valid_ = false;
-      return;
-    }
-
-    if (end_ && cmp_->Compare(target, *end_) >= 0) {
-      iter_->SeekForPrev(*end_);
-
-      // Upper bound is exclusive, so we need a key which is strictly smaller
-      if (iter_->Valid() && cmp_->Compare(iter_->key(), *end_) == 0) {
-        iter_->Prev();
-      }
-
-      UpdateAndEnforceLowerBound();
-      return;
-    }
-
-    iter_->SeekForPrev(target);
-    UpdateAndEnforceLowerBound();
-  }
-
-  void Next() override {
-    assert(valid_);
-    iter_->Next();
-    UpdateAndEnforceUpperBound();
-  }
-
-  bool NextAndGetResult(IterateResult* result) override {
-    assert(valid_);
-    assert(result);
-
-    IterateResult res;
-    valid_ = iter_->NextAndGetResult(&res);
-
-    if (!valid_) {
-      return false;
-    }
-
-    if (end_) {
-      EnforceUpperBoundImpl(res.bound_check_result);
-
-      if (!valid_) {
-        return false;
-      }
-    }
-
-    res.bound_check_result = IterBoundCheck::kInbound;
-    *result = res;
-
-    return true;
-  }
-
-  void Prev() override {
-    assert(valid_);
-    iter_->Prev();
-    UpdateAndEnforceLowerBound();
-  }
-
-  Slice key() const override {
-    assert(valid_);
-    return iter_->key();
-  }
-
-  Slice user_key() const override {
-    assert(valid_);
-    return iter_->user_key();
-  }
-
-  Slice value() const override {
-    assert(valid_);
-    return iter_->value();
-  }
-
-  Status status() const override { return iter_->status(); }
-
-  bool PrepareValue() override {
-    assert(valid_);
-
-    if (iter_->PrepareValue()) {
-      return true;
-    }
-
-    assert(!iter_->Valid());
-    valid_ = false;
-    return false;
-  }
-
-  bool MayBeOutOfLowerBound() override {
-    assert(valid_);
-    return false;
-  }
-
-  IterBoundCheck UpperBoundCheckResult() override {
-    assert(valid_);
-    return IterBoundCheck::kInbound;
-  }
-
-  void SetPinnedItersMgr(PinnedIteratorsManager* pinned_iters_mgr) override {
-    iter_->SetPinnedItersMgr(pinned_iters_mgr);
-  }
-
-  bool IsKeyPinned() const override {
-    assert(valid_);
-    return iter_->IsKeyPinned();
-  }
-
-  bool IsValuePinned() const override {
-    assert(valid_);
-    return iter_->IsValuePinned();
-  }
-
-  Status GetProperty(std::string prop_name, std::string* prop) override {
-    return iter_->GetProperty(prop_name, prop);
-  }
-
- private:
-  void UpdateValid() {
-    assert(!iter_->Valid() || iter_->status().ok());
-
-    valid_ = iter_->Valid();
-  }
-
-  void EnforceUpperBoundImpl(IterBoundCheck bound_check_result) {
-    if (bound_check_result == IterBoundCheck::kInbound) {
-      return;
-    }
-
-    if (bound_check_result == IterBoundCheck::kOutOfBound) {
-      valid_ = false;
-      return;
-    }
-
-    assert(bound_check_result == IterBoundCheck::kUnknown);
-
-    if (cmp_->Compare(key(), *end_) >= 0) {
-      valid_ = false;
-    }
-  }
-
-  void EnforceUpperBound() {
-    if (!valid_) {
-      return;
-    }
-
-    if (!end_) {
-      return;
-    }
-
-    EnforceUpperBoundImpl(iter_->UpperBoundCheckResult());
-  }
-
-  void EnforceLowerBound() {
-    if (!valid_) {
-      return;
-    }
-
-    if (!start_) {
-      return;
-    }
-
-    if (!iter_->MayBeOutOfLowerBound()) {
-      return;
-    }
-
-    if (cmp_->Compare(key(), *start_) < 0) {
-      valid_ = false;
-    }
-  }
-
-  void AssertBounds() {
-    assert(!valid_ || !start_ || cmp_->Compare(key(), *start_) >= 0);
-    assert(!valid_ || !end_ || cmp_->Compare(key(), *end_) < 0);
-  }
-
-  void UpdateAndEnforceBounds() {
-    UpdateValid();
-    EnforceUpperBound();
-    EnforceLowerBound();
-    AssertBounds();
-  }
-
-  void UpdateAndEnforceUpperBound() {
-    UpdateValid();
-    EnforceUpperBound();
-    AssertBounds();
-  }
-
-  void UpdateAndEnforceLowerBound() {
-    UpdateValid();
-    EnforceLowerBound();
-    AssertBounds();
-  }
-
-  InternalIterator* iter_;
-  const Slice* start_;
-  const Slice* end_;
-  const Comparator* cmp_;
-  bool valid_;
-};
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -1,258 +0,0 @@
-//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
-//  This source code is licensed under both the GPLv2 (found in the
-//  COPYING file in the root directory) and Apache 2.0 License
-//  (found in the LICENSE.Apache file in the root directory).
-
-#include "db/compaction/clipping_iterator.h"
-
-#include <algorithm>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "db/dbformat.h"
-#include "rocksdb/comparator.h"
-#include "test_util/testharness.h"
-#include "test_util/testutil.h"
-#include "util/vector_iterator.h"
-
-namespace ROCKSDB_NAMESPACE {
-
-// A vector iterator which does its own bounds checking. This is for testing the
-// optimizations in the clipping iterator where we bypass the bounds checking if
-// the input iterator has already performed it.
-class BoundsCheckingVectorIterator : public VectorIterator {
- public:
-  BoundsCheckingVectorIterator(const std::vector<std::string>& keys,
-                               const std::vector<std::string>& values,
-                               const Slice* start, const Slice* end,
-                               const Comparator* cmp)
-      : VectorIterator(keys, values, cmp), start_(start), end_(end), cmp_(cmp) {
-    assert(cmp_);
-  }
-
-  bool NextAndGetResult(IterateResult* result) override {
-    assert(Valid());
-    assert(result);
-
-    Next();
-
-    if (!Valid()) {
-      return false;
-    }
-
-    result->key = key();
-    result->bound_check_result = UpperBoundCheckResult();
-    result->value_prepared = true;
-
-    return true;
-  }
-
-  bool MayBeOutOfLowerBound() override {
-    assert(Valid());
-
-    if (!start_) {
-      return false;
-    }
-
-    return cmp_->Compare(key(), *start_) < 0;
-  }
-
-  IterBoundCheck UpperBoundCheckResult() override {
-    assert(Valid());
-
-    if (!end_) {
-      return IterBoundCheck::kInbound;
-    }
-
-    return cmp_->Compare(key(), *end_) >= 0 ? IterBoundCheck::kOutOfBound
-                                            : IterBoundCheck::kInbound;
-  }
-
- private:
-  const Slice* start_;
-  const Slice* end_;
-  const Comparator* cmp_;
-};
-
-class ClippingIteratorTest
-    : public ::testing::Test,
-      public ::testing::WithParamInterface<std::tuple<bool, size_t, size_t>> {};
-
-TEST_P(ClippingIteratorTest, Clip) {
-  const std::vector<std::string> keys{"key0", "key1", "key2", "key3", "key4",
-                                      "key5", "key6", "key7", "key8", "key9"};
-  const std::vector<std::string> values{
-      "unused0", "value1",  "value2",  "value3",  "unused4",
-      "unused5", "unused6", "unused7", "unused8", "unused9"};
-
-  assert(keys.size() == values.size());
-
-  // Note: the input always contains key1, key2, and key3; however, the clipping
-  // window is based on the test parameters: its left edge is a value in the
-  // range [0, 4], and its size is a value in the range [0, 5]
-  const std::vector<std::string> input_keys{keys[1], keys[2], keys[3]};
-  const std::vector<std::string> input_values{values[1], values[2], values[3]};
-
-  const bool use_bounds_checking_vec_it = std::get<0>(GetParam());
-
-  const size_t clip_start_idx = std::get<1>(GetParam());
-  const size_t clip_window_size = std::get<2>(GetParam());
-  const size_t clip_end_idx = clip_start_idx + clip_window_size;
-
-  const Slice start(keys[clip_start_idx]);
-  const Slice end(keys[clip_end_idx]);
-
-  std::unique_ptr<InternalIterator> input(
-      use_bounds_checking_vec_it
-          ? new BoundsCheckingVectorIterator(input_keys, input_values, &start,
-                                             &end, BytewiseComparator())
-          : new VectorIterator(input_keys, input_values, BytewiseComparator()));
-
-  ClippingIterator clip(input.get(), &start, &end, BytewiseComparator());
-
-  // The range the clipping iterator should return values from. This is
-  // essentially the intersection of the input range [1, 4) and the clipping
-  // window [clip_start_idx, clip_end_idx)
-  const size_t data_start_idx =
-      std::max(clip_start_idx, static_cast<size_t>(1));
-  const size_t data_end_idx = std::min(clip_end_idx, static_cast<size_t>(4));
-
-  // Range is empty; all Seeks should fail
-  if (data_start_idx >= data_end_idx) {
-    clip.SeekToFirst();
-    ASSERT_FALSE(clip.Valid());
-
-    clip.SeekToLast();
-    ASSERT_FALSE(clip.Valid());
-
-    for (size_t i = 0; i < keys.size(); ++i) {
-      clip.Seek(keys[i]);
-      ASSERT_FALSE(clip.Valid());
-
-      clip.SeekForPrev(keys[i]);
-      ASSERT_FALSE(clip.Valid());
-    }
-
-    return;
-  }
-
-  // Range is non-empty; call SeekToFirst and iterate forward
-  clip.SeekToFirst();
-  ASSERT_TRUE(clip.Valid());
-  ASSERT_EQ(clip.key(), keys[data_start_idx]);
-  ASSERT_EQ(clip.value(), values[data_start_idx]);
-  ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-  ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-
-  for (size_t i = data_start_idx + 1; i < data_end_idx; ++i) {
-    clip.Next();
-    ASSERT_TRUE(clip.Valid());
-    ASSERT_EQ(clip.key(), keys[i]);
-    ASSERT_EQ(clip.value(), values[i]);
-    ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-    ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-  }
-
-  clip.Next();
-  ASSERT_FALSE(clip.Valid());
-
-  // Do it again using NextAndGetResult
-  clip.SeekToFirst();
-  ASSERT_TRUE(clip.Valid());
-  ASSERT_EQ(clip.key(), keys[data_start_idx]);
-  ASSERT_EQ(clip.value(), values[data_start_idx]);
-  ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-  ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-
-  for (size_t i = data_start_idx + 1; i < data_end_idx; ++i) {
-    IterateResult result;
-    ASSERT_TRUE(clip.NextAndGetResult(&result));
-    ASSERT_EQ(result.key, keys[i]);
-    ASSERT_EQ(result.bound_check_result, IterBoundCheck::kInbound);
-    ASSERT_TRUE(clip.Valid());
-    ASSERT_EQ(clip.key(), keys[i]);
-    ASSERT_EQ(clip.value(), values[i]);
-    ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-    ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-  }
-
-  IterateResult result;
-  ASSERT_FALSE(clip.NextAndGetResult(&result));
-  ASSERT_FALSE(clip.Valid());
-
-  // Call SeekToLast and iterate backward
-  clip.SeekToLast();
-  ASSERT_TRUE(clip.Valid());
-  ASSERT_EQ(clip.key(), keys[data_end_idx - 1]);
-  ASSERT_EQ(clip.value(), values[data_end_idx - 1]);
-  ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-  ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-
-  for (size_t i = data_end_idx - 2; i >= data_start_idx; --i) {
-    clip.Prev();
-    ASSERT_TRUE(clip.Valid());
-    ASSERT_EQ(clip.key(), keys[i]);
-    ASSERT_EQ(clip.value(), values[i]);
-    ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-    ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-  }
-
-  clip.Prev();
-  ASSERT_FALSE(clip.Valid());
-
-  // Call Seek/SeekForPrev for all keys; Seek should return the smallest key
-  // which is >= the target; SeekForPrev should return the largest key which is
-  // <= the target
-  for (size_t i = 0; i < keys.size(); ++i) {
-    clip.Seek(keys[i]);
-
-    if (i < data_start_idx) {
-      ASSERT_TRUE(clip.Valid());
-      ASSERT_EQ(clip.key(), keys[data_start_idx]);
-      ASSERT_EQ(clip.value(), values[data_start_idx]);
-      ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-      ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-    } else if (i < data_end_idx) {
-      ASSERT_TRUE(clip.Valid());
-      ASSERT_EQ(clip.key(), keys[i]);
-      ASSERT_EQ(clip.value(), values[i]);
-      ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-      ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-    } else {
-      ASSERT_FALSE(clip.Valid());
-    }
-
-    clip.SeekForPrev(keys[i]);
-
-    if (i < data_start_idx) {
-      ASSERT_FALSE(clip.Valid());
-    } else if (i < data_end_idx) {
-      ASSERT_TRUE(clip.Valid());
-      ASSERT_EQ(clip.key(), keys[i]);
-      ASSERT_EQ(clip.value(), values[i]);
-      ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-      ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-    } else {
-      ASSERT_TRUE(clip.Valid());
-      ASSERT_EQ(clip.key(), keys[data_end_idx - 1]);
-      ASSERT_EQ(clip.value(), values[data_end_idx - 1]);
-      ASSERT_FALSE(clip.MayBeOutOfLowerBound());
-      ASSERT_EQ(clip.UpperBoundCheckResult(), IterBoundCheck::kInbound);
-    }
-  }
-}
-
-INSTANTIATE_TEST_CASE_P(
-    ClippingIteratorTest, ClippingIteratorTest,
-    ::testing::Combine(
-        ::testing::Bool(),
-        ::testing::Range(static_cast<size_t>(0), static_cast<size_t>(5)),
-        ::testing::Range(static_cast<size_t>(0), static_cast<size_t>(6))));
-
-}  // namespace ROCKSDB_NAMESPACE
-
-int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
@@ -204,24 +204,27 @@ bool Compaction::IsFullCompaction(
  return num_files_in_compaction == total_num_files;
 }

-Compaction::Compaction(
-    VersionStorageInfo* vstorage, const ImmutableOptions& _immutable_options,
-    const MutableCFOptions& _mutable_cf_options,
-    const MutableDBOptions& _mutable_db_options,
-    std::vector<CompactionInputFiles> _inputs, int _output_level,
-    uint64_t _target_file_size, uint64_t _max_compaction_bytes,
-    uint32_t _output_path_id, CompressionType _compression,
-    CompressionOptions _compression_opts, Temperature _output_temperature,
-    uint32_t _max_subcompactions, std::vector<FileMetaData*> _grandparents,
-    bool _manual_compaction, double _score, bool _deletion_compaction,
-    CompactionReason _compaction_reason)
+Compaction::Compaction(VersionStorageInfo* vstorage,
+                       const ImmutableCFOptions& _immutable_cf_options,
+                       const MutableCFOptions& _mutable_cf_options,
+                       const MutableDBOptions& _mutable_db_options,
+                       std::vector<CompactionInputFiles> _inputs,
+                       int _output_level, uint64_t _target_file_size,
+                       uint64_t _max_compaction_bytes, uint32_t _output_path_id,
+                       CompressionType _compression,
+                       CompressionOptions _compression_opts,
+                       uint32_t _max_subcompactions,
+                       std::vector<FileMetaData*> _grandparents,
+                       bool _manual_compaction, double _score,
+                       bool _deletion_compaction,
+                       CompactionReason _compaction_reason)
    : input_vstorage_(vstorage),
      start_level_(_inputs[0].level),
      output_level_(_output_level),
      max_output_file_size_(_target_file_size),
      max_compaction_bytes_(_max_compaction_bytes),
      max_subcompactions_(_max_subcompactions),
-      immutable_options_(_immutable_options),
+      immutable_cf_options_(_immutable_cf_options),
      mutable_cf_options_(_mutable_cf_options),
      input_version_(nullptr),
      number_levels_(vstorage->num_levels()),
@@ -229,7 +232,6 @@ Compaction::Compaction(
      output_path_id_(_output_path_id),
      output_compression_(_compression),
      output_compression_opts_(_compression_opts),
-      output_temperature_(_output_temperature),
      deletion_compaction_(_deletion_compaction),
      inputs_(PopulateWithAtomicBoundaries(vstorage, std::move(_inputs))),
      grandparents_(std::move(_grandparents)),
@@ -238,8 +240,7 @@ Compaction::Compaction(
      is_full_compaction_(IsFullCompaction(vstorage, inputs_)),
      is_manual_compaction_(_manual_compaction),
      is_trivial_move_(false),
-      compaction_reason_(_compaction_reason),
-      notify_on_compaction_completion_(false) {
+      compaction_reason_(_compaction_reason) {
  MarkFilesBeingCompacted(true);
  if (is_manual_compaction_) {
    compaction_reason_ = CompactionReason::kManualCompaction;
@@ -247,6 +248,12 @@ Compaction::Compaction(
  if (max_subcompactions_ == 0) {
    max_subcompactions_ = _mutable_db_options.max_subcompactions;
  }
+  if (!bottommost_level_) {
+    // Currently we only enable dictionary compression during compaction to the
+    // bottommost level.
+    output_compression_opts_.max_dict_bytes = 0;
+    output_compression_opts_.zstd_max_train_bytes = 0;
+  }

 #ifndef NDEBUG
  for (size_t i = 1; i < inputs_.size(); ++i) {
@@ -277,7 +284,7 @@ Compaction::~Compaction() {

 bool Compaction::InputCompressionMatchesOutput() const {
  int base_level = input_vstorage_->base_level();
-  bool matches = (GetCompressionType(immutable_options_, input_vstorage_,
+  bool matches = (GetCompressionType(immutable_cf_options_, input_vstorage_,
                                     mutable_cf_options_, start_level_,
                                     base_level) == output_compression_);
  if (matches) {
@@ -302,19 +309,13 @@ bool Compaction::IsTrivialMove() const {
  }

  if (is_manual_compaction_ &&
-      (immutable_options_.compaction_filter != nullptr ||
-       immutable_options_.compaction_filter_factory != nullptr)) {
+      (immutable_cf_options_.compaction_filter != nullptr ||
+       immutable_cf_options_.compaction_filter_factory != nullptr)) {
    // This is a manual compaction and we have a compaction filter that should
    // be executed, we cannot do a trivial move
    return false;
  }

-  if (start_level_ == output_level_) {
-    // It doesn't make sense if compaction picker picks files just to trivial
-    // move to the same level.
-    return false;
-  }
-
  // Used in universal compaction, where trivial move can be done if the
  // input files are non overlapping
  if ((mutable_cf_options_.compaction_options_universal.allow_trivial_move) &&
@@ -382,13 +383,7 @@ bool Compaction::KeyNotExistsBeyondOutputLevel(
        auto* f = files[level_ptrs->at(lvl)];
        if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
          // We've advanced far enough
-          // In the presence of user-defined timestamp, we may need to handle
-          // the case in which f->smallest.user_key() (including ts) has the
-          // same user key, but the ts part is smaller. If so,
-          // Compare(user_key, f->smallest.user_key()) returns -1.
-          // That's why we need CompareWithoutTimestamp().
-          if (user_cmp->CompareWithoutTimestamp(user_key,
-                                                f->smallest.user_key()) >= 0) {
+          if (user_cmp->Compare(user_key, f->smallest.user_key()) >= 0) {
            // Key falls in this file's range, so it may
            // exist beyond output level
            return false;
@@ -517,14 +512,14 @@ uint64_t Compaction::OutputFilePreallocationSize() const {
  }

  if (max_output_file_size_ != port::kMaxUint64 &&
-      (immutable_options_.compaction_style == kCompactionStyleLevel ||
+      (immutable_cf_options_.compaction_style == kCompactionStyleLevel ||
       output_level() > 0)) {
    preallocation_size = std::min(max_output_file_size_, preallocation_size);
  }

  // Over-estimate slightly so we don't end up just barely crossing
  // the threshold
-  // No point to preallocate more than 1GB.
+  // No point to prellocate more than 1GB.
  return std::min(uint64_t{1073741824},
                  preallocation_size + (preallocation_size / 10));
 }
@@ -534,23 +529,16 @@ std::unique_ptr<CompactionFilter> Compaction::CreateCompactionFilter() const {
    return nullptr;
  }

-  if (!cfd_->ioptions()
-           ->compaction_filter_factory->ShouldFilterTableFileCreation(
-               TableFileCreationReason::kCompaction)) {
-    return nullptr;
-  }
-
  CompactionFilter::Context context;
  context.is_full_compaction = is_full_compaction_;
  context.is_manual_compaction = is_manual_compaction_;
  context.column_family_id = cfd_->GetID();
-  context.reason = TableFileCreationReason::kCompaction;
  return cfd_->ioptions()->compaction_filter_factory->CreateCompactionFilter(
      context);
 }

 std::unique_ptr<SstPartitioner> Compaction::CreateSstPartitioner() const {
-  if (!immutable_options_.sst_partitioner_factory) {
+  if (!immutable_cf_options_.sst_partitioner_factory) {
    return nullptr;
  }

@@ -560,7 +548,8 @@ std::unique_ptr<SstPartitioner> Compaction::CreateSstPartitioner() const {
  context.output_level = output_level_;
  context.smallest_user_key = smallest_user_key_;
  context.largest_user_key = largest_user_key_;
-  return immutable_options_.sst_partitioner_factory->CreatePartitioner(context);
+  return immutable_cf_options_.sst_partitioner_factory->CreatePartitioner(
+      context);
 }

 bool Compaction::IsOutputLevelEmpty() const {
@@ -571,14 +560,6 @@ bool Compaction::ShouldFormSubcompactions() const {
  if (max_subcompactions_ <= 1 || cfd_ == nullptr) {
    return false;
  }
-
-  // Note: the subcompaction boundary picking logic does not currently guarantee
-  // that all user keys that differ only by timestamp get processed by the same
-  // subcompaction.
-  if (cfd_->user_comparator()->timestamp_size() > 0) {
-    return false;
-  }
-
  if (cfd_->ioptions()->compaction_style == kCompactionStyleLevel) {
    return (start_level_ == 0 || is_manual_compaction_) && output_level_ > 0 &&
           !IsOutputLevelEmpty();
@@ -589,42 +570,10 @@ bool Compaction::ShouldFormSubcompactions() const {
  }
 }

-bool Compaction::DoesInputReferenceBlobFiles() const {
-  assert(input_version_);
-
-  const VersionStorageInfo* storage_info = input_version_->storage_info();
-  assert(storage_info);
-
-  if (storage_info->GetBlobFiles().empty()) {
-    return false;
-  }
-
-  for (size_t i = 0; i < inputs_.size(); ++i) {
-    for (const FileMetaData* meta : inputs_[i].files) {
-      assert(meta);
-
-      if (meta->oldest_blob_file_number != kInvalidBlobFileNumber) {
-        return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-uint64_t Compaction::MinInputFileOldestAncesterTime(
-    const InternalKey* start, const InternalKey* end) const {
+uint64_t Compaction::MinInputFileOldestAncesterTime() const {
  uint64_t min_oldest_ancester_time = port::kMaxUint64;
-  const InternalKeyComparator& icmp =
-      column_family_data()->internal_comparator();
  for (const auto& level_files : inputs_) {
    for (const auto& file : level_files.files) {
-      if (start != nullptr && icmp.Compare(file->largest, *start) < 0) {
-        continue;
-      }
-      if (end != nullptr && icmp.Compare(file->smallest, *end) > 0) {
-        continue;
-      }
      uint64_t oldest_ancester_time = file->TryGetOldestAncesterTime();
      if (oldest_ancester_time != 0) {
        min_oldest_ancester_time =
@@ -70,14 +70,13 @@ class CompactionFilter;
 class Compaction {
 public:
  Compaction(VersionStorageInfo* input_version,
-             const ImmutableOptions& immutable_options,
+             const ImmutableCFOptions& immutable_cf_options,
             const MutableCFOptions& mutable_cf_options,
             const MutableDBOptions& mutable_db_options,
             std::vector<CompactionInputFiles> inputs, int output_level,
             uint64_t target_file_size, uint64_t max_compaction_bytes,
             uint32_t output_path_id, CompressionType compression,
-             CompressionOptions compression_opts,
-             Temperature output_temperature, uint32_t max_subcompactions,
+             CompressionOptions compression_opts, uint32_t max_subcompactions,
             std::vector<FileMetaData*> grandparents,
             bool manual_compaction = false, double score = -1,
             bool deletion_compaction = false,
@@ -163,7 +162,7 @@ class Compaction {
  CompressionType output_compression() const { return output_compression_; }

  // What compression options for output
-  const CompressionOptions& output_compression_opts() const {
+  CompressionOptions output_compression_opts() const {
    return output_compression_opts_;
  }

@@ -224,10 +223,10 @@ class Compaction {
  // How many total levels are there?
  int number_levels() const { return number_levels_; }

-  // Return the ImmutableOptions that should be used throughout the compaction
+  // Return the ImmutableCFOptions that should be used throughout the compaction
  // procedure
-  const ImmutableOptions* immutable_options() const {
-    return &immutable_options_;
+  const ImmutableCFOptions* immutable_cf_options() const {
+    return &immutable_cf_options_;
  }

  // Return the MutableCFOptions that should be used throughout the compaction
@@ -267,11 +266,6 @@ class Compaction {
  // Should this compaction be broken up into smaller ones run in parallel?
  bool ShouldFormSubcompactions() const;

-  // Returns true iff at least one input file references a blob file.
-  //
-  // PRE: input version has been set.
-  bool DoesInputReferenceBlobFiles() const;
-
  // test function to validate the functionality of IsBottommostLevel()
  // function -- determines if compaction with inputs and storage is bottommost
  static bool TEST_IsBottommostLevel(
@@ -300,24 +294,9 @@ class Compaction {

  uint64_t max_compaction_bytes() const { return max_compaction_bytes_; }

-  Temperature output_temperature() const { return output_temperature_; }
-
  uint32_t max_subcompactions() const { return max_subcompactions_; }

-  // start and end are sub compact range. Null if no boundary.
-  // This is used to filter out some input files' ancester's time range.
-  uint64_t MinInputFileOldestAncesterTime(const InternalKey* start,
-                                          const InternalKey* end) const;
-
-  // Called by DBImpl::NotifyOnCompactionCompleted to make sure number of
-  // compaction begin and compaction completion callbacks match.
-  void SetNotifyOnCompactionCompleted() {
-    notify_on_compaction_completion_ = true;
-  }
-
-  bool ShouldNotifyOnCompactionCompleted() const {
-    return notify_on_compaction_completion_;
-  }
+  uint64_t MinInputFileOldestAncesterTime() const;

 private:
  // mark (or clear) all files that are being compacted
@@ -351,7 +330,7 @@ class Compaction {
  uint64_t max_output_file_size_;
  uint64_t max_compaction_bytes_;
  uint32_t max_subcompactions_;
-  const ImmutableOptions immutable_options_;
+  const ImmutableCFOptions immutable_cf_options_;
  const MutableCFOptions mutable_cf_options_;
  Version* input_version_;
  VersionEdit edit_;
@@ -362,8 +341,7 @@ class Compaction {
  const uint32_t output_path_id_;
  CompressionType output_compression_;
  CompressionOptions output_compression_opts_;
-  Temperature output_temperature_;
-  // If true, then the compaction can be done by simply deleting input files.
+  // If true, then the comaction can be done by simply deleting input files.
  const bool deletion_compaction_;

  // Compaction input files organized by level. Constant after construction
@@ -403,10 +381,6 @@ class Compaction {

  // Reason for compaction
  CompactionReason compaction_reason_;
-
-  // Notify on compaction completion only if listener was notified on compaction
-  // begin.
-  bool notify_on_compaction_completion_;
 };

 // Return sum of sizes of all files in `files`.
@@ -5,12 +5,8 @@

 #pragma once

-#include <cstdint>
-
 #include "rocksdb/rocksdb_namespace.h"

-namespace ROCKSDB_NAMESPACE {
-
 struct CompactionIterationStats {
  // Compaction statistics

@@ -38,12 +34,4 @@ struct CompactionIterationStats {
  // Single-Delete diagnostics for exceptional situations
  uint64_t num_single_del_fallthru = 0;
  uint64_t num_single_del_mismatch = 0;
-
-  // Blob related statistics
-  uint64_t num_blobs_read = 0;
-  uint64_t total_blob_bytes_read = 0;
-  uint64_t num_blobs_relocated = 0;
-  uint64_t total_blob_bytes_relocated = 0;
 };
-
-}  // namespace ROCKSDB_NAMESPACE
@@ -5,7 +5,6 @@
 #pragma once

 #include <algorithm>
-#include <cinttypes>
 #include <deque>
 #include <string>
 #include <unordered_set>
@@ -23,53 +22,6 @@
 namespace ROCKSDB_NAMESPACE {

 class BlobFileBuilder;
-class BlobFetcher;
-class PrefetchBufferCollection;
-
-// A wrapper of internal iterator whose purpose is to count how
-// many entries there are in the iterator.
-class SequenceIterWrapper : public InternalIterator {
- public:
-  SequenceIterWrapper(InternalIterator* iter, const Comparator* cmp,
-                      bool need_count_entries)
-      : icmp_(cmp, /*named=*/false),
-        inner_iter_(iter),
-        need_count_entries_(need_count_entries) {}
-  bool Valid() const override { return inner_iter_->Valid(); }
-  Status status() const override { return inner_iter_->status(); }
-  void Next() override {
-    num_itered_++;
-    inner_iter_->Next();
-  }
-  void Seek(const Slice& target) override {
-    if (!need_count_entries_) {
-      inner_iter_->Seek(target);
-    } else {
-      // For flush cases, we need to count total number of entries, so we
-      // do Next() rather than Seek().
-      while (inner_iter_->Valid() &&
-             icmp_.Compare(inner_iter_->key(), target) < 0) {
-        Next();
-      }
-    }
-  }
-  Slice key() const override { return inner_iter_->key(); }
-  Slice value() const override { return inner_iter_->value(); }
-
-  // Unused InternalIterator methods
-  void SeekToFirst() override { assert(false); }
-  void Prev() override { assert(false); }
-  void SeekForPrev(const Slice& /* target */) override { assert(false); }
-  void SeekToLast() override { assert(false); }
-
-  uint64_t num_itered() const { return num_itered_; }
-
- private:
-  InternalKeyComparator icmp_;
-  InternalIterator* inner_iter_;  // not owned
-  uint64_t num_itered_ = 0;
-  bool need_count_entries_;
-};

 class CompactionIterator {
 public:
@@ -77,137 +29,70 @@ class CompactionIterator {
  // CompactionIterator uses. Tests can override it.
  class CompactionProxy {
   public:
+    explicit CompactionProxy(const Compaction* compaction)
+        : compaction_(compaction) {}
+
    virtual ~CompactionProxy() = default;
-
-    virtual int level() const = 0;
-
-    virtual bool KeyNotExistsBeyondOutputLevel(
-        const Slice& user_key, std::vector<size_t>* level_ptrs) const = 0;
-
-    virtual bool bottommost_level() const = 0;
-
-    virtual int number_levels() const = 0;
-
-    virtual Slice GetLargestUserKey() const = 0;
-
-    virtual bool allow_ingest_behind() const = 0;
-
-    virtual bool preserve_deletes() const = 0;
-
-    virtual bool allow_mmap_reads() const = 0;
-
-    virtual bool enable_blob_garbage_collection() const = 0;
-
-    virtual double blob_garbage_collection_age_cutoff() const = 0;
-
-    virtual uint64_t blob_compaction_readahead_size() const = 0;
-
-    virtual const Version* input_version() const = 0;
-
-    virtual bool DoesInputReferenceBlobFiles() const = 0;
-
-    virtual const Compaction* real_compaction() const = 0;
-  };
-
-  class RealCompaction : public CompactionProxy {
-   public:
-    explicit RealCompaction(const Compaction* compaction)
-        : compaction_(compaction) {
-      assert(compaction_);
-      assert(compaction_->immutable_options());
-      assert(compaction_->mutable_cf_options());
+    virtual int level(size_t /*compaction_input_level*/ = 0) const {
+      return compaction_->level();
    }
-
-    int level() const override { return compaction_->level(); }
-
-    bool KeyNotExistsBeyondOutputLevel(
-        const Slice& user_key, std::vector<size_t>* level_ptrs) const override {
+    virtual bool KeyNotExistsBeyondOutputLevel(
+        const Slice& user_key, std::vector<size_t>* level_ptrs) const {
      return compaction_->KeyNotExistsBeyondOutputLevel(user_key, level_ptrs);
    }
-
-    bool bottommost_level() const override {
+    virtual bool bottommost_level() const {
      return compaction_->bottommost_level();
    }
-
-    int number_levels() const override { return compaction_->number_levels(); }
-
-    Slice GetLargestUserKey() const override {
+    virtual int number_levels() const { return compaction_->number_levels(); }
+    virtual Slice GetLargestUserKey() const {
      return compaction_->GetLargestUserKey();
    }
-
-    bool allow_ingest_behind() const override {
-      return compaction_->immutable_options()->allow_ingest_behind;
+    virtual bool allow_ingest_behind() const {
+      return compaction_->immutable_cf_options()->allow_ingest_behind;
+    }
+    virtual bool preserve_deletes() const {
+      return compaction_->immutable_cf_options()->preserve_deletes;
    }

-    bool preserve_deletes() const override {
-      return compaction_->immutable_options()->preserve_deletes;
-    }
-
-    bool allow_mmap_reads() const override {
-      return compaction_->immutable_options()->allow_mmap_reads;
-    }
-
-    bool enable_blob_garbage_collection() const override {
-      return compaction_->mutable_cf_options()->enable_blob_garbage_collection;
-    }
-
-    double blob_garbage_collection_age_cutoff() const override {
-      return compaction_->mutable_cf_options()
-          ->blob_garbage_collection_age_cutoff;
-    }
-
-    uint64_t blob_compaction_readahead_size() const override {
-      return compaction_->mutable_cf_options()->blob_compaction_readahead_size;
-    }
-
-    const Version* input_version() const override {
-      return compaction_->input_version();
-    }
-
-    bool DoesInputReferenceBlobFiles() const override {
-      return compaction_->DoesInputReferenceBlobFiles();
-    }
-
-    const Compaction* real_compaction() const override { return compaction_; }
+   protected:
+    CompactionProxy() = default;

   private:
    const Compaction* compaction_;
  };

-  CompactionIterator(
-      InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
-      SequenceNumber last_sequence, std::vector<SequenceNumber>* snapshots,
-      SequenceNumber earliest_write_conflict_snapshot,
-      const SnapshotChecker* snapshot_checker, Env* env,
-      bool report_detailed_time, bool expect_valid_internal_key,
-      CompactionRangeDelAggregator* range_del_agg,
-      BlobFileBuilder* blob_file_builder, bool allow_data_in_errors,
-      const Compaction* compaction = nullptr,
-      const CompactionFilter* compaction_filter = nullptr,
-      const std::atomic<bool>* shutting_down = nullptr,
-      const SequenceNumber preserve_deletes_seqnum = 0,
-      const std::atomic<int>* manual_compaction_paused = nullptr,
-      const std::atomic<bool>* manual_compaction_canceled = nullptr,
-      const std::shared_ptr<Logger> info_log = nullptr,
-      const std::string* full_history_ts_low = nullptr);
+  CompactionIterator(InternalIterator* input, const Comparator* cmp,
+                     MergeHelper* merge_helper, SequenceNumber last_sequence,
+                     std::vector<SequenceNumber>* snapshots,
+                     SequenceNumber earliest_write_conflict_snapshot,
+                     const SnapshotChecker* snapshot_checker, Env* env,
+                     bool report_detailed_time, bool expect_valid_internal_key,
+                     CompactionRangeDelAggregator* range_del_agg,
+                     BlobFileBuilder* blob_file_builder,
+                     bool allow_data_in_errors,
+                     const Compaction* compaction = nullptr,
+                     const CompactionFilter* compaction_filter = nullptr,
+                     const std::atomic<bool>* shutting_down = nullptr,
+                     const SequenceNumber preserve_deletes_seqnum = 0,
+                     const std::atomic<int>* manual_compaction_paused = nullptr,
+                     const std::shared_ptr<Logger> info_log = nullptr);

  // Constructor with custom CompactionProxy, used for tests.
-  CompactionIterator(
-      InternalIterator* input, const Comparator* cmp, MergeHelper* merge_helper,
-      SequenceNumber last_sequence, std::vector<SequenceNumber>* snapshots,
-      SequenceNumber earliest_write_conflict_snapshot,
-      const SnapshotChecker* snapshot_checker, Env* env,
-      bool report_detailed_time, bool expect_valid_internal_key,
-      CompactionRangeDelAggregator* range_del_agg,
-      BlobFileBuilder* blob_file_builder, bool allow_data_in_errors,
-      std::unique_ptr<CompactionProxy> compaction,
-      const CompactionFilter* compaction_filter = nullptr,
-      const std::atomic<bool>* shutting_down = nullptr,
-      const SequenceNumber preserve_deletes_seqnum = 0,
-      const std::atomic<int>* manual_compaction_paused = nullptr,
-      const std::atomic<bool>* manual_compaction_canceled = nullptr,
-      const std::shared_ptr<Logger> info_log = nullptr,
-      const std::string* full_history_ts_low = nullptr);
+  CompactionIterator(InternalIterator* input, const Comparator* cmp,
+                     MergeHelper* merge_helper, SequenceNumber last_sequence,
+                     std::vector<SequenceNumber>* snapshots,
+                     SequenceNumber earliest_write_conflict_snapshot,
+                     const SnapshotChecker* snapshot_checker, Env* env,
+                     bool report_detailed_time, bool expect_valid_internal_key,
+                     CompactionRangeDelAggregator* range_del_agg,
+                     BlobFileBuilder* blob_file_builder,
+                     bool allow_data_in_errors,
+                     std::unique_ptr<CompactionProxy> compaction,
+                     const CompactionFilter* compaction_filter = nullptr,
+                     const std::atomic<bool>* shutting_down = nullptr,
+                     const SequenceNumber preserve_deletes_seqnum = 0,
+                     const std::atomic<int>* manual_compaction_paused = nullptr,
+                     const std::shared_ptr<Logger> info_log = nullptr);

  ~CompactionIterator();

@@ -231,36 +116,16 @@ class CompactionIterator {
  bool Valid() const { return valid_; }
  const Slice& user_key() const { return current_user_key_; }
  const CompactionIterationStats& iter_stats() const { return iter_stats_; }
-  uint64_t num_input_entry_scanned() const { return input_.num_itered(); }

 private:
  // Processes the input stream to find the next output
  void NextFromInput();

-  // Do final preparations before presenting the output to the callee.
+  // Do last preparations before presenting the output to the callee. At this
+  // point this only zeroes out the sequence number if possible for better
+  // compression.
  void PrepareOutput();

-  // Passes the output value to the blob file builder (if any), and replaces it
-  // with the corresponding blob reference if it has been actually written to a
-  // blob file (i.e. if it passed the value size check). Returns true if the
-  // value got extracted to a blob file, false otherwise.
-  bool ExtractLargeValueIfNeededImpl();
-
-  // Extracts large values as described above, and updates the internal key's
-  // type to kTypeBlobIndex if the value got extracted. Should only be called
-  // for regular values (kTypeValue).
-  void ExtractLargeValueIfNeeded();
-
-  // Relocates valid blobs residing in the oldest blob files if garbage
-  // collection is enabled. Relocated blobs are written to new blob files or
-  // inlined in the LSM tree depending on the current settings (i.e.
-  // enable_blob_files and min_blob_size). Should only be called for blob
-  // references (kTypeBlobIndex).
-  //
-  // Note: the stacked BlobDB implementation's compaction filter based GC
-  // algorithm is also called from here.
-  void GarbageCollectBlobIfNeeded();
-
  // Invoke compaction filter if needed.
  // Return true on success, false on failures (e.g.: kIOError).
  bool InvokeFilterIfNeeded(bool* need_skip, Slice* skip_until);
@@ -285,32 +150,9 @@ class CompactionIterator {
               SnapshotCheckerResult::kInSnapshot;
  }

-  bool DefinitelyInSnapshot(SequenceNumber seq, SequenceNumber snapshot);
+  bool IsInEarliestSnapshot(SequenceNumber sequence);

-  bool DefinitelyNotInSnapshot(SequenceNumber seq, SequenceNumber snapshot);
-
-  // Extract user-defined timestamp from user key if possible and compare it
-  // with *full_history_ts_low_ if applicable.
-  inline void UpdateTimestampAndCompareWithFullHistoryLow() {
-    if (!timestamp_size_) {
-      return;
-    }
-    Slice ts = ExtractTimestampFromUserKey(ikey_.user_key, timestamp_size_);
-    curr_ts_.assign(ts.data(), ts.size());
-    if (full_history_ts_low_) {
-      cmp_with_history_ts_low_ =
-          cmp_->CompareTimestamp(ts, *full_history_ts_low_);
-    }
-  }
-
-  static uint64_t ComputeBlobGarbageCollectionCutoffFileNumber(
-      const CompactionProxy* compaction);
-  static std::unique_ptr<BlobFetcher> CreateBlobFetcherIfNeeded(
-      const CompactionProxy* compaction);
-  static std::unique_ptr<PrefetchBufferCollection>
-  CreatePrefetchBufferCollectionIfNeeded(const CompactionProxy* compaction);
-
-  SequenceIterWrapper input_;
+  InternalIterator* input_;
  const Comparator* cmp_;
  MergeHelper* merge_helper_;
  const std::vector<SequenceNumber>* snapshots_;
@@ -324,7 +166,6 @@ class CompactionIterator {
  const SequenceNumber earliest_write_conflict_snapshot_;
  const SnapshotChecker* const snapshot_checker_;
  Env* env_;
-  SystemClock* clock_;
  bool report_detailed_time_;
  bool expect_valid_internal_key_;
  CompactionRangeDelAggregator* range_del_agg_;
@@ -333,7 +174,6 @@ class CompactionIterator {
  const CompactionFilter* compaction_filter_;
  const std::atomic<bool>* shutting_down_;
  const std::atomic<int>* manual_compaction_paused_;
-  const std::atomic<bool>* manual_compaction_canceled_;
  const SequenceNumber preserve_deletes_seqnum_;
  bool bottommost_level_;
  bool valid_ = false;
@@ -341,20 +181,6 @@ class CompactionIterator {
  SequenceNumber earliest_snapshot_;
  SequenceNumber latest_snapshot_;

-  std::shared_ptr<Logger> info_log_;
-
-  bool allow_data_in_errors_;
-
-  // Comes from comparator.
-  const size_t timestamp_size_;
-
-  // Lower bound timestamp to retain full history in terms of user-defined
-  // timestamp. If a key's timestamp is older than full_history_ts_low_, then
-  // the key *may* be eligible for garbage collection (GC). The skipping logic
-  // is in `NextFromInput()` and `PrepareOutput()`.
-  // If nullptr, NO GC will be performed and all history will be preserved.
-  const std::string* const full_history_ts_low_;
-
  // State
  //
  // Points to a copy of the current compaction iterator output (current_key_)
@@ -373,13 +199,11 @@ class CompactionIterator {
  // Stores whether ikey_.user_key is valid. If set to false, the user key is
  // not compared against the current key in the underlying iterator.
  bool has_current_user_key_ = false;
-  // If false, the iterator holds a copy of the current compaction iterator
-  // output (or current key in the underlying iterator during NextFromInput()).
-  bool at_next_ = false;
-
+  bool at_next_ = false;  // If false, the iterator
+  // Holds a copy of the current compaction iterator output (or current key in
+  // the underlying iterator during NextFromInput()).
  IterKey current_key_;
  Slice current_user_key_;
-  std::string curr_ts_;
  SequenceNumber current_user_key_sequence_;
  SequenceNumber current_user_key_snapshot_;

@@ -394,14 +218,7 @@ class CompactionIterator {
  // PinnedIteratorsManager used to pin input_ Iterator blocks while reading
  // merge operands and then releasing them after consuming them.
  PinnedIteratorsManager pinned_iters_mgr_;
-
-  uint64_t blob_garbage_collection_cutoff_file_number_;
-
-  std::unique_ptr<BlobFetcher> blob_fetcher_;
-  std::unique_ptr<PrefetchBufferCollection> prefetch_buffers_;
-
  std::string blob_index_;
-  PinnableSlice blob_value_;
  std::string compaction_filter_value_;
  InternalKey compaction_filter_skip_until_;
  // "level_ptrs" holds indices that remember which file of an associated
@@ -416,19 +233,9 @@ class CompactionIterator {
  // Used to avoid purging uncommitted values. The application can specify
  // uncommitted values by providing a SnapshotChecker object.
  bool current_key_committed_;
+  std::shared_ptr<Logger> info_log_;

-  // Saved result of ucmp->CompareTimestamp(current_ts_, *full_history_ts_low_)
-  int cmp_with_history_ts_low_;
-
-  const int level_;
-
-  // True if the previous internal key (same user key)'s sequence number has
-  // just been zeroed out during bottommost compaction.
-  bool last_key_seq_zeroed_{false};
-
-  void AdvanceInputIter() { input_.Next(); }
-
-  void SkipUntil(const Slice& skip_until) { input_.Seek(skip_until); }
+  bool allow_data_in_errors_;

  bool IsShuttingDown() {
    // This is a best-effort facility, so memory_order_relaxed is sufficient.
@@ -437,27 +244,8 @@ class CompactionIterator {

  bool IsPausingManualCompaction() {
    // This is a best-effort facility, so memory_order_relaxed is sufficient.
-    return (manual_compaction_paused_ &&
-            manual_compaction_paused_->load(std::memory_order_relaxed) > 0) ||
-           (manual_compaction_canceled_ &&
-            manual_compaction_canceled_->load(std::memory_order_relaxed));
+    return manual_compaction_paused_ &&
+           manual_compaction_paused_->load(std::memory_order_relaxed) > 0;
  }
 };
-
-inline bool CompactionIterator::DefinitelyInSnapshot(SequenceNumber seq,
-                                                     SequenceNumber snapshot) {
-  return ((seq) <= (snapshot) &&
-          (snapshot_checker_ == nullptr ||
-           LIKELY(snapshot_checker_->CheckInSnapshot((seq), (snapshot)) ==
-                  SnapshotCheckerResult::kInSnapshot)));
-}
-
-inline bool CompactionIterator::DefinitelyNotInSnapshot(
-    SequenceNumber seq, SequenceNumber snapshot) {
-  return ((seq) > (snapshot) ||
-          (snapshot_checker_ != nullptr &&
-           UNLIKELY(snapshot_checker_->CheckInSnapshot((seq), (snapshot)) ==
-                    SnapshotCheckerResult::kNotInSnapshot)));
-}
-
 }  // namespace ROCKSDB_NAMESPACE
--- a/Show More
+++ b/Show More