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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2773) Don't create compound file for large segments by default
Date Sat, 20 Nov 2010 15:54:13 GMT
Don't create compound file for large segments by default
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                 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


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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