Sunil G commented on YARN-3487:

Hi [~leftnoteasy] and [~jlowe]
During reloading CS config, if a queue s removed, eventhough 'queues' is a 
concurrent one, operation for delete may be in progress. And here we may try 
for checkAccess and pass it with success.

> CapacityScheduler scheduler lock obtained 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, YARN-3487.002.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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