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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-5310) Merge Threads unnecessarily block on SerialMergeScheduler
Date Sun, 27 Apr 2014 18:08:15 GMT

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

Michael McCandless updated LUCENE-5310:
---------------------------------------

    Attachment: LUCENE-5310.patch

Another iteration ... MS.getNextMerge now invokes maybeStall only when the max number of merges
is already running, and another merge is pending.  E.g. this enables a CMS subclass to override
maybeStall and return false to return right away.  I think it's close.

> 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, LUCENE-5310.patch,
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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