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Posted to dev@lucene.apache.org by "Shawn Heisey (JIRA)" <ji...@apache.org> on 2016/02/10 07:42:18 UTC
[jira] [Commented] (LUCENE-7020) TieredMergePolicy - cascade
maxMergeAtOnce setting to maxMergeAtOnceExplicit
[ https://issues.apache.org/jira/browse/LUCENE-7020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140406#comment-15140406 ]
Shawn Heisey commented on LUCENE-7020:
--------------------------------------
A further idea -- when setMaxMergeAtOnce is used, *also* cascade the same value to segmentsPerTier, unless that value has already been set.
> 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
>
> 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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