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https://issues.apache.org/jira/browse/LUCENE-10041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feng Gui updated LUCENE-10041:
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Description:
In lucene 8.4 (Elasticsearch 7.6.2), all indices are enabled with soft-deletes.
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]
, I think we should reuse the result of numDeletesToMerge which can reduce 3%
CPU and some IO overheads.
.
was:
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.
> 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
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In lucene 8.4 (Elasticsearch 7.6.2), all indices are enabled with
> soft-deletes. 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]
> , I think we should reuse the result of numDeletesToMerge which can reduce
> 3% CPU and some IO overheads.
>
> .
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