Sunil G commented on YARN-3487:

Hi [~leftnoteasy]
I am sorry for providing lesser content earlier. After seeing your comment 
again, i could see that my comment also was going on same line.

Runtime updates can add or change some CLIs for a Queue. So if synchronized 
keyword s removed, checkAccess is open and some checks may pass/fail as per the 
partial information available for CLI of Queue.
So we may run into partial errors which is a race case condition. 

> 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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