Anand Ananthabhotla
ffb7788d45
Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/14889 When `separate_key_value_in_data_block=true`, the data block iterator stores keys and values in separate sections. Under certain conditions during backward iteration (Prev/SeekForPrev), `DBIter::FindValueForCurrentKey` encounters entries whose values cannot be pinned, causing a `NotSupported` error: "Backward iteration not supported if underlying iterator's value cannot be pinned." This manifests in the crash test as `TestIterateAgainstExpected` failures when the random flag combination includes `separate_key_value_in_data_block=1` (added in 47cfeb656ff3) with `test_backward_scan=1` (the default). The fix automatically disables `test_backward_scan` when `separate_key_value_in_data_block` is enabled, matching the pattern used for other option incompatibilities in the stress tool. Reviewed By: xingbowang Differential Revision: D109837793 fbshipit-source-id: 04230e6c0af42e98fb82d0ddcc3d857419e879e3
RocksDB: A Persistent Key-Value Store for Flash and RAM Storage
RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) 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
See the github wiki for more explanation.
The public interface is in include/. Callers should not include or
rely on the details of any other header files in this package. Those
internal APIs may be changed without warning.
Questions and discussions are welcome on the RocksDB Developers Public Facebook group and email list on Google Groups.
License
RocksDB is dual-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). You may select, at your option, one of the above-listed licenses.