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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3487) CapacityScheduler scheduler lock obtained unnecessarily
Date Fri, 17 Apr 2015 18:13:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14500342#comment-14500342
] 

Wangda Tan commented on YARN-3487:
----------------------------------

Thanks for feedback from [~sunilg], [~jlowe].

Make this as a sub JIRA of YARN-3091, and w/r lock for CS is tracked by YARN-3139.

The latest patch LGTM, will commit when Jenkins get back.

> CapacityScheduler scheduler lock obtained unnecessarily
> -------------------------------------------------------
>
>                 Key: YARN-3487
>                 URL: https://issues.apache.org/jira/browse/YARN-3487
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: YARN-3487.001.patch, YARN-3487.002.patch, YARN-3487.003.patch
>
>
> Recently saw a significant slowdown of applications on a large cluster, and we noticed
there were a large number of blocked threads on the RM.  Most of the blocked threads were
waiting for the CapacityScheduler lock while calling getQueueInfo.



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