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https://issues.apache.org/jira/browse/LUCENE-10078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17540979#comment-17540979
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Adrien Grand commented on LUCENE-10078:
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We had discussions about this in the context of the O(n^2) merging that
{{floorSegmentSize}} introduces (LUCENE-10574), so I took a stab at this issue,
so that users fully benefit from the trade-off we're making of creating
unbalanced merges for the sake of having fewer segments to deal with at search
time.
> 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
> Time Spent: 10m
> 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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