rocksdb

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Xingbo Wang de7b8e8f7d Add RocksDB flush reason and atomic flush request metrics (#14898 )

Summary:
This PR adds flush observability for debugging write stalls and flush bottlenecks.

  Changes include:

  - Add flush reason tickers for physical flush jobs:
      - rocksdb.flush.reason.write_buffer_full
      - rocksdb.flush.reason.write_buffer_manager
      - rocksdb.flush.reason.memtable_max_range_deletions

  - Add flush memtable size histograms:
      - rocksdb.flush.memtable.memory.bytes
      - rocksdb.flush.memtable.total.data.size.bytes
      - rocksdb.flush.write_buffer_full.memtable.memory.bytes
      - rocksdb.flush.write_buffer_manager.memtable.memory.bytes

  - Add FlushReason::kMemtableMaxRangeDeletions and propagate it from memtables when memtable_max_range_deletions triggers a flush.
  - Preserve atomic flush as a single request-level reason. For atomic flush, the reason is derived only from CFs that scheduled the flush, not every CF selected into the atomic flush cut.
  - Add atomic flush request-level counters:
      - rocksdb.atomic_flush.request.reason.write_buffer_full
      - rocksdb.atomic_flush.request.reason.write_buffer_manager
      - rocksdb.atomic_flush.request.reason.memtable_max_range_deletions
      - rocksdb.atomic_flush.request.reason.other

  - Keep existing per-CF flush job reason counters unchanged. Under atomic flush, rocksdb.flush.reason.* still counts physical CF flush jobs, while rocksdb.atomic_flush.request.reason.* counts one logical atomic flush request.
  - Wire the new flush reason, ticker, and histogram types through Java and JNI bindings.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/14898

Test Plan: CI

Reviewed By: anand1976

Differential Revision: D110214337

Pulled By: xingbowang

fbshipit-source-id: 4a445c4175d2e09ff5edbe66fde81fa00bb9e8da

2026-07-01 10:34:16 -07:00

benchmark/src/main/java/org/rocksdb/benchmark

Remove deprecated Options::access_hint_on_compaction_start (#11654 )

2024-02-05 13:35:19 -08:00

crossbuild

Pass build parallelism flag to Docker builds (#12392 )

2024-02-28 12:51:00 -08:00

jmh

JNI get_helper code sharing / multiGet() use efficient batch C++ support (#12344 )

2024-03-12 12:42:08 -07:00

rocksjni

Add RocksDB flush reason and atomic flush request metrics (#14898 )