[jira] Commented: (LUCENE-672) new merge policy

["Ning Li (JIRA)" <ji...@apache.org>]

    [ http://issues.apache.org/jira/browse/LUCENE-672?page=comments#action_12435174 ] 
            
Ning Li commented on LUCENE-672:
--------------------------------

A small fix named KeepDocCount0Segment.Sept15.patch is attached to LUCENE-565 (can't attach here).

In mergeSegments(...), if the doc count of a merged segment is 0, it is not added to the index (it should be properly cleaned up). Before LUCENE-672, a merged segment was always added to the index. The use of mergeSegments(...) in, e.g. addIndexes(Directory[]), assumed that behaviour. For code simplicity, this fix restores the old behaviour that a merged segment is always added to the index. This does NOT break any of the good properties of the new merge policy.

TestIndexWriterMergePolicy is slightly modified to fix a bug and to check that segments are probably cleaned up. The patch passes all the tests.

> new merge policy
> ----------------
>
>                 Key: LUCENE-672
>                 URL: http://issues.apache.org/jira/browse/LUCENE-672
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>    Affects Versions: 2.0.0
>            Reporter: Yonik Seeley
>         Assigned To: Yonik Seeley
>             Fix For: 2.1
>
>
> New merge policy developed in the course of 
> http://issues.apache.org/jira/browse/LUCENE-565
> http://issues.apache.org/jira/secure/attachment/12340475/newMergePolicy.Sept08.patch

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