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Update HISTORY.md with the recent memtable trimming fixes

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Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/6194

Differential Revision: D19125292

Pulled By: ltamasi

fbshipit-source-id: d41aca2755ec4bec07feedd6b561e8d18606a931
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Levi Tamasi 2019-12-16 15:15:42 -08:00 committed by Facebook Github Bot
parent 35126dd874
commit 2d095b4dbc
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HISTORY.md
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@ -7,6 +7,7 @@
### Bug Fixes
* Fix a bug that can cause unnecessary bg thread to be scheduled(#6104).
* Fix a bug in which a snapshot read could be affected by a DeleteRange after the snapshot (#6062).
* Fixed two performance issues related to memtable history trimming. First, a new SuperVersion is now created only if some memtables were actually trimmed. Second, trimming is only scheduled if there is at least one flushed memtable that is kept in memory for the purposes of transaction conflict checking.
## 6.6.0 (11/25/2019)
### Bug Fixes