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https://issues.apache.org/jira/browse/LUCENE-7020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17403639#comment-17403639
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ASF subversion and git services commented on LUCENE-7020:
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Commit 598a9da4f081e9e9102117b9ef441ba137b209a8 in lucene-solr's branch
refs/heads/branch_8x from Adrien Grand
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=598a9da ]
LUCENE-7020: Deprecate TieredMergePolicy#setMaxMergeAtOnceExplicit.
> TieredMergePolicy - cascade maxMergeAtOnce setting to maxMergeAtOnceExplicit
> ----------------------------------------------------------------------------
>
> Key: LUCENE-7020
> URL: https://issues.apache.org/jira/browse/LUCENE-7020
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 5.4.1
> Reporter: Shawn Heisey
> Assignee: Shawn Heisey
> Priority: Major
> Attachments: LUCENE-7020.patch
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> SOLR-8621 covers improvements in configuring a merge policy in Solr.
> Discussions on that issue brought up the fact that if large values are
> configured for maxMergeAtOnce and segmentsPerTier, but maxMergeAtOnceExplicit
> is not changed, then doing a forceMerge is likely to not work as expected.
> When I first configured maxMergeAtOnce and segmentsPerTier to 35 in Solr, I
> saw an optimize (forceMerge) fully rewrite most of the index *twice* in order
> to achieve a single segment, because there were approximately 80 segments in
> the index before the optimize, and maxMergeAtOnceExplicit defaults to 30. On
> advice given via the solr-user mailing list, I configured
> maxMergeAtOnceExplicit to 105 and have not had that problem since.
> I propose that setting maxMergeAtOnce should also set maxMergeAtOnceExplicit
> to three times the new value -- unless the setMaxMergeAtOnceExplicit method
> has been invoked, indicating that the user wishes to set that value
> themselves.
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