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https://issues.apache.org/jira/browse/LUCENE-8392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-8392.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 7.5
                   master (8.0)

> TieredMergePolicy has broken assumptions when maxMergeAtOnce is greater than 
> segmentsPerTier
> --------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-8392
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8392
>             Project: Lucene - Core
>          Issue Type: Test
>            Reporter: Adrien Grand
>            Priority: Minor
>             Fix For: master (8.0), 7.5
>
>         Attachments: LUCENE-8392.patch
>
>
> While working on LUCENE-8391 I had test failures when {{maxMergeAtOnce}} is 
> larger than {{segmentsPerTier}}. For instance when all segments are on the 
> same tier, the maximum number of segments that is allowed in the index is 
> {{segmentsPerTier}} but because the tiered policy wants to find 
> {{maxMergeAtOnce}} segments to merge, no segments will get merged if there 
> are less than {{maxMergeAtOnce}}  segments.



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