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https://issues.apache.org/jira/browse/LUCENE-10078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554422#comment-17554422
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ASF subversion and git services commented on LUCENE-10078:
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Commit 3be18bc62e9072a7ba4269e54e55b003f65174c2 in lucene's branch
refs/heads/main from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=3be18bc62e9 ]
LUCENE-10078: Fix TestIndexWriterOutOfFileDescriptors failures due to
merge-on-refresh.
> Enable merge-on-refresh by default?
> -----------------------------------
>
> Key: LUCENE-10078
> URL: https://issues.apache.org/jira/browse/LUCENE-10078
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Priority: Major
> Fix For: 9.3
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> This is a spinoff from the discussion in LUCENE-10073.
> The newish merge-on-refresh ([crazy origin
> story|https://blog.mikemccandless.com/2021/03/open-source-collaboration-or-how-we.html])
> feature is a powerful way to reduce searched segment counts, especially
> helpful for applications using many indexing threads. Such usage will write
> many tiny segments on each refresh, which could quickly be merged up during
> the {{refresh}} operation.
> We would have to implement a default for {{findFullFlushMerges}}
> (LUCENE-10064 is open for this), and then we would need
> {{IndexWriterConfig.getMaxFullFlushMergeWaitMillis}} a non-zero value (this
> issue).
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