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https://issues.apache.org/jira/browse/LUCENE-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285063#comment-13285063
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Simon Willnauer commented on LUCENE-4084:
-----------------------------------------

I think we need to add a changes entry too since MP now needs to impl clone in 
some cases?
                
> unable to generate a 4.x back compat test index
> -----------------------------------------------
>
>                 Key: LUCENE-4084
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4084
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/index
>            Reporter: Robert Muir
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-4084.patch, LUCENE-4084.patch
>
>
> It seems the issue is an IWC cannot be used across 2 different indexwriters, 
> because the DWPTThreadPool is created on the IndexWriterConfig, and you hit a 
> SetOnce exception... seems like the exception is correct and it would be bad 
> to have two indexwriters sharing the same DWPTThreadPool?
> stacktrace to follow in a comment.

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