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Date: Tue, 9 Aug 2011 12:47:27 +0000 (UTC)
From: "Simon Willnauer (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Updated] (LUCENE-3368) IndexWriter commits update documents
 without corresponding delete
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     [ https://issues.apache.org/jira/browse/LUCENE-3368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer updated LUCENE-3368:
------------------------------------

    Attachment: LUCENE-3368.patch

here is a patch that clones && commits the SIS while syncing on IW. All test pass including the TestStressNRT running2400 iterations

> 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
>             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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