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RocksDB 8.0.0
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@ajkr ajkr released this 18 Mar 00:15
v8.0.0
fdf403f

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.
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