[jira] [Updated] (LUCENE-5310) Merge Threads unnecessarily block on SerialMergeScheduler

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5310?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer updated LUCENE-5310:
------------------------------------

    Attachment: LUCENE-5310.patch

here is a patch

> 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
>
>
> 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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