meta/rocksdb v8.0.0

RocksDB 8.0.0

on GitHub

8.0.0 (02/19/2023)

Behavior changes

• ReadOptions::verify_checksums=false disables checksum verification for more reads of non-CacheEntryRole::kDataBlock blocks.
• In case of scan with async_io enabled, if posix doesn't support IOUring, Status::NotSupported error will be returned to the users. Initially that error was swallowed and reads were switched to synchronous reads.

Bug Fixes

• Fixed a data race on ColumnFamilyData::flush_reason caused by concurrent flushes.
• Fixed an issue in Get and MultiGet when user-defined timestamps is enabled in combination with BlobDB.
• Fixed some atypical behaviors for LockWAL() such as allowing concurrent/recursive use and not expecting UnlockWAL() after non-OK result. See API comments.
• Fixed a feature interaction bug where for blobs GetEntity would expose the blob reference instead of the blob value.
• Fixed DisableManualCompaction() and CompactRangeOptions::canceled to cancel compactions even when they are waiting on conflicting compactions to finish
• Fixed a bug in which a successful GetMergeOperands() could transiently return Status::MergeInProgress()
• Return the correct error (Status::NotSupported()) to MultiGet caller when ReadOptions::async_io flag is true and IO uring is not enabled. Previously, Status::Corruption() was being returned when the actual failure was lack of async IO support.
• Fixed a bug in DB open/recovery from a compressed WAL that was caused due to incorrect handling of certain record fragments with the same offset within a WAL block.

Feature Removal

• Remove RocksDB Lite.
• The feature block_cache_compressed is removed. Statistics related to it are removed too.
• Remove deprecated Env::LoadEnv(). Use Env::CreateFromString() instead.
• Remove deprecated FileSystem::Load(). Use FileSystem::CreateFromString() instead.
• Removed the deprecated version of these utility functions and the corresponding Java bindings: LoadOptionsFromFile, LoadLatestOptions, CheckOptionsCompatibility.
• Remove the FactoryFunc from the LoadObject method from the Customizable helper methods.

Public API Changes

• Moved rarely-needed Cache class definition to new advanced_cache.h, and added a CacheWrapper class to advanced_cache.h. Minor changes to SimCache API definitions.
• Completely removed the following deprecated/obsolete statistics: the tickers BLOCK_CACHE_INDEX_BYTES_EVICT, BLOCK_CACHE_FILTER_BYTES_EVICT, BLOOM_FILTER_MICROS, NO_FILE_CLOSES, STALL_L0_SLOWDOWN_MICROS, STALL_MEMTABLE_COMPACTION_MICROS, STALL_L0_NUM_FILES_MICROS, RATE_LIMIT_DELAY_MILLIS, NO_ITERATORS, NUMBER_FILTERED_DELETES, WRITE_TIMEDOUT, BLOB_DB_GC_NUM_KEYS_OVERWRITTEN, BLOB_DB_GC_NUM_KEYS_EXPIRED, BLOB_DB_GC_BYTES_OVERWRITTEN, BLOB_DB_GC_BYTES_EXPIRED, BLOCK_CACHE_COMPRESSION_DICT_BYTES_EVICT as well as the histograms STALL_L0_SLOWDOWN_COUNT, STALL_MEMTABLE_COMPACTION_COUNT, STALL_L0_NUM_FILES_COUNT, HARD_RATE_LIMIT_DELAY_COUNT, SOFT_RATE_LIMIT_DELAY_COUNT, BLOB_DB_GC_MICROS, and NUM_DATA_BLOCKS_READ_PER_LEVEL. Note that as a result, the C++ enum values of the still supported statistics have changed. Developers are advised to not rely on the actual numeric values.
• Deprecated IngestExternalFileOptions::write_global_seqno and change default to false. This option only needs to be set to true to generate a DB compatible with RocksDB versions before 5.16.0.
• Remove deprecated APIs GetColumnFamilyOptionsFrom{Map|String}(const ColumnFamilyOptions&, ..), GetDBOptionsFrom{Map|String}(const DBOptions&, ..), GetBlockBasedTableOptionsFrom{Map|String}(const BlockBasedTableOptions& table_options, ..) and GetPlainTableOptionsFrom{Map|String}(const PlainTableOptions& table_options,..).
• Added a subcode of Status::Corruption, Status::SubCode::kMergeOperatorFailed, for users to identify corruption failures originating in the merge operator, as opposed to RocksDB's internally identified data corruptions

Build Changes

• The make build now builds a shared library by default instead of a static library. Use LIB_MODE=static to override.

New Features

• Compaction filters are now supported for wide-column entities by means of the FilterV3 API. See the comment of the API for more details.
• Added do_not_compress_roles to CompressedSecondaryCacheOptions to disable compression on certain kinds of block. Filter blocks are now not compressed by CompressedSecondaryCache by default.
• Added a new MultiGetEntity API that enables batched wide-column point lookups. See the API comments for more details.