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https://issues.apache.org/jira/browse/LUCENE-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717242#action_12717242
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Uwe Schindler commented on LUCENE-1453:
---------------------------------------

Because the error sometimes also occurs with the refcounting directories, but 
more seldom (because of the refcounting helps to keep the directory open, even 
when it is closed one time too much).
And our problem: we want to really remove this ugly closeDir stuff from 
IndexReaders, the code is sometimes unreadable and its hard to find out whats 
going on.

> 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: 2.4.1, 2.9
>
>         Attachments: Failing-testcase-LUCENE-1453.patch, 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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