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https://issues.apache.org/jira/browse/LUCENE-2773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-2773:
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Attachment: LUCENE-2773.patch
Patch.
I added a get/setNoCFSRatio to LogMergePolicy, defaulted to 10% (0.1)
meaning if the estimated size of the merged segment is greater than
10% of the total size of the index, then we leave the merge segment in
non-compound format.
I also defaulted the maxMergeMB to 2 GB, meaning (w/ the default
mergeFactor of 10) your biggest segments will be 2 - 20 GB.
> Don't create compound file for large segments by default
> --------------------------------------------------------
>
> Key: LUCENE-2773
> URL: https://issues.apache.org/jira/browse/LUCENE-2773
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2773.patch
>
>
> Spinoff from LUCENE-2762.
> CFS is useful for keeping the open file count down. But, it costs
> some added time during indexing to build, and also ties up temporary
> disk space, causing eg a large spike on the final merge of an
> optimize.
> Since MergePolicy dictates which segments should be CFS, we can
> change it to only build CFS for "smallish" merges.
> I think we should also set a maxMergeMB by default so that very large
> merges aren't done.
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