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https://issues.apache.org/jira/browse/LUCENE-4876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13719987#comment-13719987
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Shai Erera commented on LUCENE-4876:
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Perhaps we can do a minor change -- stop calling IWC.clone() by IW on init. We
keep clone() on IWC, and the rest of the objects, and tell users that it's
their responsibility to call IWC.clone() before passing to IW? That's line a
1-liner change (well + clarifying the jdocs), that will make 99% of the users
happy. The rest should just do {{new IW(dir, conf.clone())}} ... that's simple
enough?
> IndexWriterConfig.clone should clone the MergeScheduler
> -------------------------------------------------------
>
> Key: LUCENE-4876
> URL: https://issues.apache.org/jira/browse/LUCENE-4876
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Fix For: 4.3
>
> Attachments: LUCENE-4876.patch, LUCENE-4876.patch
>
>
> ConcurrentMergeScheduler has a List<MergeThread> member to track the running
> merging threads, so IndexWriterConfig.clone should clone the merge scheduler
> so that both IndexWriterConfig instances are independant.
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