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https://issues.apache.org/jira/browse/LUCENE-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082283#comment-13082283
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Michael McCandless commented on LUCENE-3368:
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Nice catch Simon!
> IndexWriter commits update documents without corresponding delete
> -----------------------------------------------------------------
>
> Key: LUCENE-3368
> URL: https://issues.apache.org/jira/browse/LUCENE-3368
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.0, 3.0.1, 3.0.2, 3.0.3, 3.1, 3.2, 3.3
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: 3.4
>
> Attachments: LUCENE-3368.patch
>
>
> while backporting the testcase from LUCENE-3348 I ran into this thread hazard
> in the 3.x branch. We actually fixed this issue in LUCENE-3348 for Lucene 4.0
> but since DWPT has a slightly different behavior when committing segments I
> create a new issue to track this down in 3.x. when we prepare a commit we
> sync on IW flush the DW and apply all deletes then release the lock,
> maybeMerge and start the commit (IW#startCommit(userdata)). Yet, a new
> segment could be flushed via getReader and sneak into the SegementInfos which
> are cloned in IW#startCommit instead of in prepareCommit right after the
> flush.
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