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https://issues.apache.org/jira/browse/LUCENE-2820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-2820.
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Resolution: Fixed
> CMS fails to cleanly stop threads
> ---------------------------------
>
> Key: LUCENE-2820
> URL: https://issues.apache.org/jira/browse/LUCENE-2820
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2820.patch
>
>
> When you close IW, it waits for (or aborts and then waits for) all running
> merges.
> However, it's wait criteria is wrong -- it waits for the threads to be done
> w/ their merges, not for the threads to actually die.
> CMS already has a sync() method, to wait for running threads, which we can
> call from CMS.close. However it has a thread hazard because a MergeThread
> removes itself from mergeThreads before it actually exits. So sync() is able
> to return even while a merge thread is still running.
> This was uncovered by LUCENE-2819 on the test case
> TestCustomScoreQuery.testCustomExternalQuery, though I expect other test
> cases would show it.
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