Jian He commented on YARN-3887:

thanks for updating, looks good overall, few comments:
- SchedulerApplicationAttempt#appPriority can also be volatile ?
- testRMRestartWithChangeInPriority- Since the state store update is 
asynchronous, the test may fail if the state is not updated immediately, we may 
wait until the state is updated?

> Support for changing Application priority during runtime
> --------------------------------------------------------
>                 Key: YARN-3887
>                 URL: https://issues.apache.org/jira/browse/YARN-3887
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler, resourcemanager
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: 0001-YARN-3887.patch, 0002-YARN-3887.patch
> After YARN-2003, adding support to change priority of an application after 
> submission. This ticket will handle the server side implementation for same.
> A new RMAppEvent will be created to handle this, and will be common for all 
> schedulers.

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