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https://issues.apache.org/jira/browse/LUCENE-2060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless reopened LUCENE-2060:
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backport
> CMS should default its maxThreadCount to 1 (not 3)
> --------------------------------------------------
>
> Key: LUCENE-2060
> URL: https://issues.apache.org/jira/browse/LUCENE-2060
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9.3, 3.0
>
>
> From rough experience, I think the current default of 3 is too large. I
> think we get the most bang for the buck going from 0 to 1.
> I think this will especially impact optimize on an index with many segments
> -- in this case the MergePolicy happily exposes concurrency (multiple pending
> merges), and CMS will happily launch 3 threads to carry that out.
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