rocksdb/DEFAULT_OPTIONS_HISTORY.md

RocksDB default options change log

4.8.0 (5/2/2016)

• options.max_open_files changes from 5000 to -1. It improves performance, but users need to set file descriptor limit to be large enough and watch memory usage for index and bloom filters.
• options.base_background_compactions changes from max_background_compactions to 1. When users set higher max_background_compactions but the write throughput is not high, the writes are less spiky to disks.
• options.wal_recovery_mode changes from kTolerateCorruptedTailRecords to kPointInTimeRecovery. Avoid some false positive when file system or hardware reorder the writes for file data and metadata.

4.7.0 (4/8/2016)

• options.write_buffer_size changes from 4MB to 64MB.
• options.target_file_size_base changes from 2MB to 64MB.
• options.max_bytes_for_level_base changes from 10MB to 256MB.
• options.soft_pending_compaction_bytes_limit changes from 0 (disabled) to 64GB.
• options.hard_pending_compaction_bytes_limit changes from 0 (disabled) to 256GB.
• table_cache_numshardbits changes from 4 to 6.
• max_file_opening_threads changes from 1 to 16.