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https://issues.apache.org/jira/browse/LUCENE-4245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420569#comment-13420569
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Michael McCandless commented on LUCENE-4245:
--------------------------------------------

If IndexWriter.close throws ThreadInterruptedException (because "you" had 
interrupted it) then you should consider the IndexWriter not closed, and either 
IW.rollback it, or IW.close it again?
                
> IndexWriter#close(true) should either not be interruptible or should abort 
> background merge threads before returning
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-4245
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4245
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/index
>            Reporter: Mark Miller
>            Assignee: Uwe Schindler
>            Priority: Minor
>         Attachments: LUCENE-4245.patch, LUCENE-4245.patch
>
>
> Currently, there is no safe way to close a directory after closing the writer 
> without causing an exception in a merge thread if the #close call is 
> interrupted.

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