Sunil G commented on YARN-3091:

As per code review, we can get more issues in these areas mentioned by 
I feel a task we can start to run Jcarder to clearly pinpoint the locks 
problems. So it can help us in designing these subtasks with more clarity and 
may be helpful in verifying these changes again.

> [Umbrella] Improve locks of RM scheduler
> ----------------------------------------
>                 Key: YARN-3091
>                 URL: https://issues.apache.org/jira/browse/YARN-3091
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler, fairscheduler, resourcemanager, 
> scheduler
>            Reporter: Wangda Tan
> In existing YARN RM scheduler, there're some issues of using locks. For 
> example:
> - Many unnecessary synchronized locks, we have seen several cases recently 
> that too frequent access of scheduler makes scheduler hang. Which could be 
> addressed by using read/write lock. Components include scheduler, CS queues, 
> apps
> - Some fields not properly locked (Like clusterResource)
> We can address them together in this ticket.
> (More details see comments below)

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