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https://issues.apache.org/jira/browse/LUCENE-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-5310:
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Attachment: LUCENE-5310.patch
next iteration - I actually figured out that all of our MSC have this problem.
I added a more general solution and implemented a slightly smarter solution for
this in the MergeScheduler base class.
> 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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