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https://issues.apache.org/jira/browse/LUCENE-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655386#action_12655386
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Jason Rutherglen commented on LUCENE-1314:
------------------------------------------

Decided to simply release the lock in SegmentReader when a clone occurs.  If 
the original segmentreader receives updates (such as deleteDocument) after 
being cloned then it throws a LockObtainFailedException.  

> IndexReader.clone
> -----------------
>
>                 Key: LUCENE-1314
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1314
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Index
>    Affects Versions: 2.3.1
>            Reporter: Jason Rutherglen
>            Assignee: Michael McCandless
>            Priority: Minor
>         Attachments: lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, 
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, 
> lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, lucene-1314.patch, 
> lucene-1314.patch
>
>
> Based on discussion 
> http://www.nabble.com/IndexReader.reopen-issue-td18070256.html.  The problem 
> is reopen returns the same reader if there are no changes, so if docs are 
> deleted from the new reader, they are also reflected in the previous reader 
> which is not always desired behavior.

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