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https://issues.apache.org/jira/browse/LUCENE-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13806961#comment-13806961
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Michael McCandless commented on LUCENE-5310:
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Hmm, I don't think we should do this.
This blocking in SMS is by design: SMS stalls any indexing threads while merges
are running; if you want concurrency you should use CMS?
CMS, also, needs to see all threads, because it (by design) stalls incoming
index threads when there are too many merges running.
> Merge Threads unnecessarily block on SerialMergeScheduler
> ---------------------------------------------------------
>
> Key: LUCENE-5310
> URL: https://issues.apache.org/jira/browse/LUCENE-5310
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 4.5, 5.0
> Reporter: Simon Willnauer
> Priority: Minor
> Fix For: 4.6, 5.0
>
> Attachments: LUCENE-5310.patch, LUCENE-5310.patch
>
>
> I have been working on a high level merge multiplexer that shares threads
> across different IW instances and I came across the fact that
> SerialMergeScheduler actually blocks incoming thread is a merge in going on.
> Yet this blocks threads unnecessarily since we pull the merges in a loop
> anyway. We should use a tryLock operation instead of syncing the entire
> method?
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