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https://issues.apache.org/jira/browse/YARN-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501291#comment-14501291
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Hudson commented on YARN-3487:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #158 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/158/])
YARN-3487. CapacityScheduler scheduler lock obtained unnecessarily when calling 
getQueue (Jason Lowe via wangda) (wangda: rev 
f47a5763acd55cb0b3f16152c7f8df06ec0e09a9)
* 
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
* hadoop-yarn-project/CHANGES.txt


> 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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