Adrien Grand created LUCENE-8393:
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Summary: 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
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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