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https://issues.apache.org/jira/browse/LUCENE-8394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-8394.
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Resolution: Fixed
Fix Version/s: 7.5
master (8.0)
> TieredMergePolicy's handling of the case that all segments are less than the
> floor segment size is fragile
> ----------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-8394
> URL: https://issues.apache.org/jira/browse/LUCENE-8394
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: master (8.0), 7.5
>
> Attachments: LUCENE-8394.patch
>
>
> In the case that the index size is less than the floor segment size, the
> allowed number of segments is always computed as 1. In practice, it doesn't
> keep merging indefinitely only because {{doFindMerges}} has some logic that
> skips merging if the number of candidates is less than maxMergeAtOnce. This
> looks a bit fragile to me.
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