Carlo Curino updated YARN-4198:
    Issue Type: Sub-task  (was: Improvement)
        Parent: YARN-4193

> CapacityScheduler locking / synchronization improvements
> --------------------------------------------------------
>                 Key: YARN-4198
>                 URL: https://issues.apache.org/jira/browse/YARN-4198
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Carlo Curino
> In the context of YARN-4193 (which stresses the RM/CS performance) we found 
> several performance problems with  in the locking/synchronization of the 
> CapacityScheduler, as well as inconsistencies that do not normally surface 
> (incorrect locking-order of queues protected by CS locks etc). This JIRA 
> proposes several refactoring that improve this.

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