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https://issues.apache.org/jira/browse/LUCENE-1347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618390#action_12618390
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Yonik Seeley commented on LUCENE-1347:
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Yep... the success flag ensures that closing=false is only done once.
> IndexWriter.rollback can hang if a previous call hit an exception
> -----------------------------------------------------------------
>
> Key: LUCENE-1347
> URL: https://issues.apache.org/jira/browse/LUCENE-1347
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.3, 2.3.1
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.3.2, 2.4
>
> Attachments: LUCENE-1347.patch, LUCENE-1347.patch
>
>
> IW.rollback has logic to make sure only one thread actually gets to do
> the rollback whenever multiple threads are calling it at the same
> time, by setting the "boolean closing" to true in the thread that got
> there first.
> Other threads wait for that variable to become false again before
> returning from abort.
> But, we are not restoring closing to false in a try/finally in
> rollback(), which means on hitting an exception in rollback, a
> subsequent call to rollback() will hang forever.
> close() has the same logic, but there is already a try/finally there
> to restore closing to false on exception.
> The fix is straightforward.
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