Jian He commented on YARN-2644:

Just one more thing:
- probably we can move {{headroomProvider}} field into LeafQueue. Update 
headroomProvider info in the queue itself. {{FiCaSchedulerApp}} change can be 
simplified, it can get the headroomProvider via the queue Reference.

> Recalculate headroom more frequently to keep it accurate
> --------------------------------------------------------
>                 Key: YARN-2644
>                 URL: https://issues.apache.org/jira/browse/YARN-2644
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Craig Welch
>            Assignee: Craig Welch
>         Attachments: YARN-2644.11.patch
> See parent (1198) for more detail - this specifically covers calculating the 
> headroom more frequently, to cover the cases where changes have occurred 
> which impact headroom but which are not reflected due to an application not 
> being updated.

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