Wangda Tan commented on YARN-3487:

And we saw such case before, when a remote process calling getQueueInfo very 
frequently (e.g. once every 1ms), CS cannot allocate anything.

> CapacityScheduler.getQueueInfo grabs scheduler lock unnecessarily
> -----------------------------------------------------------------
>                 Key: YARN-3487
>                 URL: https://issues.apache.org/jira/browse/YARN-3487
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: YARN-3487.001.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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