6a14f7a976
Summary: Changing several option defaults: options.max_open_files changes from 5000 to -1 options.base_background_compactions changes from max_background_compactions to 1 options.wal_recovery_mode changes from kTolerateCorruptedTailRecords to kTolerateCorruptedTailRecords options.compaction_pri changes from kByCompensatedSize to kByCompensatedSize Test Plan: Write unit tests to see OldDefaults() works as expected. Reviewers: IslamAbdelRahman, yhchiang, igor Reviewed By: igor Subscribers: MarkCallaghan, yiwu, kradhakrishnan, leveldb, andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D56427
1.1 KiB
1.1 KiB
Unreleased
- 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.
RocksDB default options change log
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.