Update HISTORY.md for PR 7888 (#7890)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/7890

Reviewed By: ajkr

Differential Revision: D26005509

Pulled By: ltamasi

fbshipit-source-id: e7eb732180d447900788d0e3a17dfd1c3f1e708a
This commit is contained in:
Levi Tamasi 2021-01-21 14:18:25 -08:00 committed by Facebook GitHub Bot
parent 12a8be1d44
commit 19076c95aa

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# Rocksdb Change Log
## Unreleased
* Fix a race condition between DB startups and shutdowns in managing the periodic background worker threads. One effect of this race condition could be the process being terminated.
## 6.17.0 (01/15/2021)
### Behavior Changes
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### Bug Fixes
* Version older than 6.15 cannot decode VersionEdits `WalAddition` and `WalDeletion`, fixed this by changing the encoded format of them to be ignorable by older versions.
* Fix a race condition between DB startups and shutdowns in managing the periodic background worker threads. One effect of this race condition could be the process being terminated.
### Public API Change
* Add a public API WriteBufferManager::dummy_entries_in_cache_usage() which reports the size of dummy entries stored in cache (passed to WriteBufferManager). Dummy entries are used to account for DataBlocks.