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update history.md (#5245)

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Summary:
update history.md for `BottommostLevelCompaction::kForceOptimized` to mention possible user impact.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5245

Differential Revision: D15073712

Pulled By: miasantreble

fbshipit-source-id: d40f698c42e8a6368be4eac0a00d02279615edea
This commit is contained in:
Zhongyi Xie 2019-04-24 21:25:50 -07:00 committed by Facebook Github Bot
parent cd77d3c558
commit 66d8360beb
1 changed files with 1 additions and 1 deletions
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HISTORY.md
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@ -11,7 +11,7 @@
### Public API Change
* Change the behavior of OptimizeForPointLookup(): move away from hash-based block-based-table index, and use whole key memtable filtering.
* Change the behavior of OptimizeForSmallDb(): use a 16MB block cache, put index and filter blocks into it, and cost the memtable size to it. DBOptions.OptimizeForSmallDb() and ColumnFamilyOptions.OptimizeForSmallDb() start to take an optional cache object.
* Added BottommostLevelCompaction::kForceOptimized to avoid double compacting newly compacted files in bottom level compaction of manual compaction.
* Added BottommostLevelCompaction::kForceOptimized to avoid double compacting newly compacted files in the bottommost level compaction of manual compaction. Note this option may prohibit the manual compaction to produce a single file in the bottommost level.
### Bug Fixes
* Adjust WriteBufferManager's dummy entry size to block cache from 1MB to 256KB.