Release RocksDB 6.28.2 · facebook/rocksdb

6.28.2 (2022-01-31)

Fixed a major bug in which batched MultiGet could return old values for keys deleted by DeleteRange when memtable Bloom filter is enabled (memtable_prefix_bloom_size_ratio > 0). (The fix includes a substantial MultiGet performance improvement in the unusual case of both memtable_whole_key_filtering and prefix_extractor.)

Introduced 'CommitWithTimestamp' as a new tag. Currently, there is no API for user to trigger a write with this tag to the WAL. This is part of the efforts to support write-commited transactions with user-defined timestamps.

Fixed a bug in rocksdb automatic implicit prefetching which got broken because of new feature adaptive_readahead and internal prefetching got disabled when iterator moves from one file to next.
Fixed a bug in TableOptions.prepopulate_block_cache which causes segmentation fault when used with TableOptions.partition_filters = true and TableOptions.cache_index_and_filter_blocks = true.
Fixed a bug affecting custom memtable factories which are not registered with the ObjectRegistry. The bug could result in failure to save the OPTIONS file.
Fixed a bug causing two duplicate entries to be appended to a file opened in non-direct mode and tracked by FaultInjectionTestFS.
Fixed a bug in TableOptions.prepopulate_block_cache to support block-based filters also.
Block cache keys no longer use FSRandomAccessFile::GetUniqueId() (previously used when available), so a filesystem recycling unique ids can no longer lead to incorrect result or crash (#7405). For files generated by RocksDB >= 6.24, the cache keys are stable across DB::Open and DB directory move / copy / import / export / migration, etc. Although collisions are still theoretically possible, they are (a) impossible in many common cases, (b) not dependent on environmental factors, and (c) much less likely than a CPU miscalculation while executing RocksDB.

MemTableList::TrimHistory now use allocated bytes when max_write_buffer_size_to_maintain > 0(default in TrasactionDB, introduced in PR#5022) Fix #8371.

Extend WriteBatch::AssignTimestamp and AssignTimestamps API so that both functions can accept an optional checker argument that performs additional checking on timestamp sizes.
Introduce a new EventListener callback that will be called upon the end of automatic error recovery.

Replaced map property TableProperties::properties_offsets with uint64_t property external_sst_file_global_seqno_offset to save table properties's memory.
Block cache accesses are faster by RocksDB using cache keys of fixed size (16 bytes).

Removed Java API TableProperties.getPropertiesOffsets() as it exposed internal details to external users.