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https://issues.apache.org/jira/browse/LUCENE-4876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13720518#comment-13720518
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selckin commented on LUCENE-4876:
---------------------------------
This is also encouraging to just 'return this' from clone() in DeletionPolicy,
it is how i fixed my app, how solr fixed it, and elasticsearch does it as well,
so for future changes you can't even assume the clone is being done, not to
mention how cruel it is to expose clone semantics on end-users
> 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, 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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