Jian He commented on YARN-3887:

thanks Sunil, for below, I think we can add a appPriorityUpdated method in 
OrderingPolicy and follow the implementation of demandUpdated method. Doing 
that, the synchronization of queue may not be needed.
    synchronized (queue) {

      // Update new priority in SchedulerApplication


> 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, 
> 0003-YARN-3887.patch, 0004-YARN-3887.patch, 0005-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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