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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3487) CapacityScheduler scheduler lock obtained unnecessarily when calling getQueue
Date Sat, 18 Apr 2015 15:35:01 GMT

    [ https://issues.apache.org/jira/browse/YARN-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501420#comment-14501420
] 

Hudson commented on YARN-3487:
------------------------------

SUCCESS: Integrated in Hadoop-Mapreduce-trunk #2117 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2117/])
YARN-3487. CapacityScheduler scheduler lock obtained unnecessarily when calling getQueue (Jason
Lowe via wangda) (wangda: rev f47a5763acd55cb0b3f16152c7f8df06ec0e09a9)
* hadoop-yarn-project/CHANGES.txt
* hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java


> CapacityScheduler scheduler lock obtained unnecessarily when calling getQueue
> -----------------------------------------------------------------------------
>
>                 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
>             Fix For: 2.7.1
>
>         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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