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RocksDB v5.16.0 Release Notes

Release Date: 2018-08-21 // over 5 years ago

  • Public API Change

    • 🐎 The merge operands are passed to MergeOperator::ShouldMerge in the reversed order relative to how they were merged (passed to FullMerge or FullMergeV2) for performance reasons
    • GetAllKeyVersions() to take an extra argument of max_num_ikeys.
    • Using ZSTD dictionary trainer (i.e., setting CompressionOptions::zstd_max_train_bytes to a nonzero value) now requires ZSTD version 1.1.3 or later.

    🆕 New Features

    • 🔄 Changes the format of index blocks by delta encoding the index values, which are the block handles. This saves the encoding of BlockHandle::offset of the non-head index entries in each restart interval. The feature is backward compatible but not forward compatible. It is disabled by default unless format_version 4 or above is used.
    • Add a new tool: trace_analyzer. Trace_analyzer analyzes the trace file generated by using trace_replay API. It can convert the binary format trace file to a human readable txt file, output the statistics of the analyzed query types such as access statistics and size statistics, combining the dumped whole key space file to analyze, support query correlation analyzing, and etc. Current supported query types are: Get, Put, Delete, SingleDelete, DeleteRange, Merge, Iterator (Seek, SeekForPrev only).
    • Add hash index support to data blocks, which helps reducing the cpu utilization of point-lookup operations. This feature is backward compatible with the data block created without the hash index. It is disabled by default unless BlockBasedTableOptions::data_block_index_type is set to data_block_index_type = kDataBlockBinaryAndHash.

    🐛 Bug Fixes

    • 🛠 Fix a bug in misreporting the estimated partition index size in properties block.