Wangda Tan commented on YARN-2144:

bq. Haven't looked at the patch. YARN-1809 is adding the attempt UI, Maybe the 
app UI should show the total preempted containers info, and attempt UI should 
show each attempt's preempted containers info?
Thanks for pointing the attempt UI JIRA. I think RM will cleanup application's 
resource usage at the beginning of each attempt start, so it should make sense 
to show latest attempt's preempted containers info on app UI. 
And after we can persist preemption info across RM restart and YARN-1807 
committed, we can show each attempt's preempted containers info on attempts UI.
Do you agree?

> Add logs when preemption occurs
> -------------------------------
>                 Key: YARN-2144
>                 URL: https://issues.apache.org/jira/browse/YARN-2144
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler
>    Affects Versions: 2.5.0
>            Reporter: Tassapol Athiapinya
>            Assignee: Wangda Tan
>         Attachments: AM-page-preemption-info.png, YARN-2144.patch, 
> YARN-2144.patch, YARN-2144.patch
> There should be easy-to-read logs when preemption does occur. 
> 1. For debugging purpose, RM should log this.
> 2. For administrative purpose, RM webpage should have a page to show recent 
> preemption events.
> RM logs should have following properties:
> * Logs are retrievable when an application is still running and often flushed.
> * Can distinguish between AM container preemption and task container 
> preemption with container ID shown.
> * Should be INFO level log.

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