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https://issues.apache.org/jira/browse/LUCENE-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16860181#comment-16860181
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Atri Sharma commented on LUCENE-8757:
-------------------------------------
[~hossman] This is a known issue
(https://issues.apache.org/jira/browse/LUCENE-8829). The issue is not with this
JIRA but an existing issue in TopDocs.merge. We are discussing fix on
LUCENE-8829.
> Better Segment To Thread Mapping Algorithm
> ------------------------------------------
>
> Key: LUCENE-8757
> URL: https://issues.apache.org/jira/browse/LUCENE-8757
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Atri Sharma
> Assignee: Simon Willnauer
> Priority: Major
> Fix For: master (9.0), 8.2
>
> Attachments: LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch,
> LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch,
> LUCENE-8757.patch, LUCENE-8757.patch, LUCENE-8757.patch
>
>
> The current segments to threads allocation algorithm always allocates one
> thread per segment. This is detrimental to performance in case of skew in
> segment sizes since small segments also get their dedicated thread. This can
> lead to performance degradation due to context switching overheads.
>
> A better algorithm which is cognizant of size skew would have better
> performance for realistic scenarios
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