Wangda Tan commented on YARN-2181:

Attached first version patch, implemented all requirements in my first comment. 
And attach two screenshots correspond to queue page and application page.
Please note that,
* This patch included YARN-2144 because YARN-2181 depends on it, I will 
refactor this patch after YARN-2144 committed. 
* This patch only included changes for CapacityScheduler
* Preemption information will not be persisted across RM restart.

> Add preemption info to RM Web UI
> --------------------------------
>                 Key: YARN-2181
>                 URL: https://issues.apache.org/jira/browse/YARN-2181
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, webapp
>    Affects Versions: 2.4.0
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: NM apps.png, YARN-2181.patch, queue page.png
> We need add preemption info to RM web page to make administrator/user get 
> more understanding about preemption happened on app/queue, etc. 

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