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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:
------------------------------------

    Attachment: LUCENE-5310.patch

here is an updated version of this patch. I moved the functionality in to a new 
abstract base class AbstractLockedMergeScheduler that allows to override the 
default blocking behavior but by default blocks if there is a thread already 
calling merge.

> 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: 4.9, 5.0
>
>         Attachments: LUCENE-5310.patch, 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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