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https://issues.apache.org/jira/browse/LUCENE-10078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17551138#comment-17551138
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ASF subversion and git services commented on LUCENE-10078:
----------------------------------------------------------
Commit b5795db0cf517f8942eed868752249df9b105603 in lucene's branch
refs/heads/main from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=b5795db0cf5 ]
LUCENE-10078: Enable merge-on-refresh by default. (#921)
This gives implementations of `findFullFlushMerges` to `LogMergePolicy` and
`TieredMergePolicy` and enables merge-on-refresh with a default timeout of
500ms.
The idea behind the 500ms default is that it felt both high-enough to have time
to run merges of small segments, and low enough that the freshness of the data
wouldn't look badly affected for users who have high refresh rates (e.g.
refreshing every second).
In both cases, `findFullFlushMerges` delegates to `findMerges` and filters
merges whose segments are all below the min/floor size.
> 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: 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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