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https://issues.apache.org/jira/browse/LUCENE-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650914#action_12650914
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Michael McCandless commented on LUCENE-1453:
--------------------------------------------

I agree -- I just committed an entry to CHANGES.txt.

> When reopen returns a new IndexReader, both IndexReaders may now control the 
> lifecycle of the underlying Directory which is managed by reference counting
> ---------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1453
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1453
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.4
>            Reporter: Mark Miller
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1453.patch, LUCENE-1453.patch, LUCENE-1453.patch
>
>
> Rough summary. Basically, FSDirectory tracks references to FSDirectory and 
> when IndexReader.reopen shares a Directory with a created IndexReader and 
> closeDirectory is true, FSDirectory's ref management will see two decrements 
> for one increment. You can end up getting an AlreadyClosed exception on the 
> Directory when the IndexReader is open.
> I have a test I'll put up. A solution seems fairly straightforward (at least 
> in what needs to be accomplished).

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