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https://issues.apache.org/jira/browse/LUCENE-10041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17390076#comment-17390076
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Feng Gui commented on LUCENE-10041:
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https://github.com/apache/lucene/pull/231
> 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
> Reporter: Feng Gui
> Assignee: Nhat Nguyen
> Priority: Minor
> Attachments: IMG21.jpeg
>
>
> In lucene 8.4 (Elasticsearch 7.6.2), all indices are soft-deletes enabled. We
> found the *TieredMergePolicy* contains redundant query computation to acquire
> numDeletesToMerge for findMerges. 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.
>
>
>
>
>
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