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https://issues.apache.org/jira/browse/YARN-3487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wangda Tan updated YARN-3487:
-----------------------------
    Issue Type: Sub-task  (was: Bug)
        Parent: YARN-3091

> 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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