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RocksDB v6.29.0 Release Notes

  • 🚀 Note: The next release will be major release 7.0. See https://github.com/facebook/rocksdb/issues/9390 for more info.

    Public API change

    • ➕ Added values to TraceFilterType: kTraceFilterIteratorSeek, kTraceFilterIteratorSeekForPrev, and kTraceFilterMultiGet. They can be set in TraceOptions to filter out the operation types after which they are named.
    • Added TraceOptions::preserve_write_order. When enabled it guarantees write records are traced in the same order they are logged to WAL and applied to the DB. By default it is disabled (false) to match the legacy behavior and prevent regression.
    • Made the Env class extend the Customizable class. Implementations need to be registered with the ObjectRegistry and to implement a Name() method in order to be created via this method.
    • 🗄 Options::OldDefaults is marked deprecated, as it is no longer maintained.
    • ➕ Add ObjectLibrary::AddFactory and ObjectLibrary::PatternEntry classes. This method and associated class are the preferred mechanism for registering factories with the ObjectLibrary going forward. The ObjectLibrary::Register method, which uses regular expressions and may be problematic, is deprecated and will be in a future release.
    • Changed BlockBasedTableOptions::block_size from size_t to uint64_t.
    • ➕ Added API warning against using Iterator::Refresh() together with DB::DeleteRange(), which are incompatible and have always risked causing the refreshed iterator to return incorrect results.
    • Made AdvancedColumnFamilyOptions.bottommost_temperature dynamically changeable with SetOptions().

    Behavior Changes

    • 0️⃣ DB::DestroyColumnFamilyHandle() will return Status::InvalidArgument() if called with DB::DefaultColumnFamily().
    • On 32-bit platforms, mmap reads are no longer quietly disabled, just discouraged.

    🆕 New Features

    • ➕ Added Options::DisableExtraChecks() that can be used to improve peak write performance by disabling checks that should not be necessary in the absence of software logic errors or CPU+memory hardware errors. (Default options are slowly moving toward some performance overheads for extra correctness checking.)

    🐎 Performance Improvements

    • 👌 Improved read performance when a prefix extractor is used (Seek, Get, MultiGet), even compared to version 6.25 baseline (see bug fix below), by optimizing the common case of prefix extractor compatible with table file and unchanging.

    🐛 Bug Fixes

    • 🛠 Fix a bug that FlushMemTable may return ok even flush not succeed.
    • 🛠 Fixed a bug of Sync() and Fsync() not using fcntl(F_FULLFSYNC) on OS X and iOS.
    • 🛠 Fixed a significant performance regression in version 6.26 when a prefix extractor is used on the read path (Seek, Get, MultiGet). (Excessive time was spent in SliceTransform::AsString().)
    • 🛠 Fixed a race condition in SstFileManagerImpl error recovery code that can cause a crash during process shutdown.

    🆕 New Features

    • ➕ Added RocksJava support for MacOS universal binary (ARM+x86)