[jira] [Created] (LUCENE-8394) TieredMergePolicy's handling of the case that all segments are less than the floor segment size is fragile

["Adrien Grand (JIRA)" <ji...@apache.org>]

Adrien Grand created LUCENE-8394:
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             Summary: 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
         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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