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https://issues.apache.org/jira/browse/LUCENE-5885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096933#comment-14096933
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Michael McCandless commented on LUCENE-5885:
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+1 to drop CMS.sync!
> MergeScheduler should not implement Closeable
> ---------------------------------------------
>
> Key: LUCENE-5885
> URL: https://issues.apache.org/jira/browse/LUCENE-5885
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Reporter: Shai Erera
>
> MergeScheduler implements Closeable and IndexWriter calls ms.close() when
> it's closed. But MergeScheduler can be shared between several writers, which
> means closing it by any particular writer is wrong. We should rather
> implement some ref-counting logic such that each IW will call incRef() in the
> ctor, and decRef() on close(), and MergeScheduler will truly close when the
> ref-count hits 0.
> As it is now, if you share a MergeScheduler between writers and close() does
> something terminating, I doubt if it really works.
> Also, when I look at ConcurrentMergeScheduler.close(), it calls sync() which
> joins all MergeThreads. But if that CMS instance is shared between few IWs,
> doesn't it mean that a single IW calling close() waits on MergeThreads that
> execute merges of other IWs!?!? This seems ... wrong?
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