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https://issues.apache.org/jira/browse/LUCENE-4147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13395826#comment-13395826
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Simon Willnauer commented on LUCENE-4147:
-----------------------------------------
mike, do we really need to acquire the commit lock? from my perspective it
would be enough to add an ensure open when we assigne pendingCommit (inside the
sync block) so that racing threads hit already close exceptions.
regarding the thread safety issue in DocWriter can you paste the trace?
> rollback/preparecommit thread hazard
> ------------------------------------
>
> Key: LUCENE-4147
> URL: https://issues.apache.org/jira/browse/LUCENE-4147
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-4147.patch, LUCENE-4147.patch
>
>
> found by
> http://jenkins.sd-datasolutions.de/job/Lucene-Solr-4.x-Windows-Java7-64/70/
> rollback should never throw this exception, as it documents it clears any
> pendingcommits.
> but it calls closeInternal outside of any sync block, so it looks like there
> is a race here.
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