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https://issues.apache.org/jira/browse/LUCENE-8394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16537241#comment-16537241
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Adrien Grand commented on LUCENE-8394:
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Here is a patch that ensures that the allowed segment count is always at least
{{segmentsPerTier}}.
> 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
> 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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