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rocksdb/DEFAULT_OPTIONS_HISTORY.md
sdong 1518b733eb Change default number of cache shard bit to be 6 and max_file_opening_threads to be 16. 
Summary: Cache shard bit 4 is sometimes too small and 6 is a more common value picked by users. Make that default. It shouldn't hurt much to change options.max_file_opening_threads default to be 16, which will reduce the worst case DB open time.

Test Plan: Run all existing tests.

Reviewers: IslamAbdelRahman, yhchiang, kradhakrishnan, igor, andrewkr

Reviewed By: andrewkr

Subscribers: andrewkr, MarkCallaghan, leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D55047
2016-04-07 13:55:10 -07:00

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Raw Blame History

Unreleased

  • 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