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https://issues.apache.org/jira/browse/LUCENE-4876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13718258#comment-13718258
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Michael McCandless commented on LUCENE-4876:
--------------------------------------------
Alas I'm not sure we did the right thing here; it's very counter intuitive that
the IndexDeletionPolicy that you set on your IWC is not the one used by
IndexWriter, and it confuses users:
http://lucene.markmail.org/thread/ihxkc44ba4mpnkpo
Why, again, must we clone everything coming off of IWC? Who is sharing these
instances across different IndexWriter instances?
> 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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