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https://issues.apache.org/jira/browse/LUCENE-8393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536899#comment-16536899
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Adrien Grand commented on LUCENE-8393:
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Here is a patch.
> TieredMergePolicy needs to take into account the maximum segment size when
> computing the allowed number of segments
> -------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-8393
> URL: https://issues.apache.org/jira/browse/LUCENE-8393
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-8393.patch
>
>
> This is a pre-existing issue that was made more likely by LUCENE-7976, given
> that segments that are larger than the max segment size divided by 2 now are
> potential candidates for merging: when computing the allowed number of
> segments, TieredMergePolicy multiplies the level size by {{maxMergeAtOnce}}
> until it finds a level that isn't full. It currently assumes that the level
> size is always less than the maximum segment size, which might not always be
> true. This might lead to underestimating the allowed number of segments and
> in-turn causing excessive merging.
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