Feng Gui created LUCENE-10041:
---------------------------------
Summary: Duplication computation for TieredMergePolicy's
numDeletesToMerge
Key: LUCENE-10041
URL: https://issues.apache.org/jira/browse/LUCENE-10041
Project: Lucene - Core
Issue Type: Improvement
Components: core/index
Affects Versions: 8.4
Environment: !image-2021-07-30-02-20-03-530.png!
Reporter: Feng Gui
In lucene 8.4 (Elasticsearch 7.6.2)，all indices is soft-deletes enabled. We
found the *TieredMergePolicy* contains redundant query computation for acquire
numDeletesToMerge. According to code from
[getSortedBySegmentSize|https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/index/TieredMergePolicy.java#L303]
, we should reuse the result of numDeletesToMerge which can reduce 3% CPU and
some IO overheads。
!image-2021-07-30-02-19-21-417.png!
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org
For additional commands, e-mail: issues-h...@lucene.apache.org
