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https://issues.apache.org/jira/browse/LUCENE-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285026#comment-13285026
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Robert Muir commented on LUCENE-4084:
-------------------------------------
Yes:
Additionally, I think its possible this might affect 3.x as well (I didnt
test). depending on the fix maybe we can also backport if its appropriate.
Today IWC documents that IW makes a private clone() so you can edit some
settings live, but this IWC.clone() is shallow so this isnt really working.
> 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
>
>
> 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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