Wangda Tan updated YARN-2144:

    Attachment: YARN-2144.patch

I’ve attached a patch contains changes to show preemption information on RM app 
page and RM log,

1) log style:
2014-06-16 10:45:22,247 INFO 
Non-AM container preempted, appId=appattempt_1402886643897_0002_000001, 
2014-06-16 10:45:22,247 INFO 
AM container preempted, appId=appattempt_1402886643897_0002_000001, 

2) Info in app page:
See <AM-page-preemption-info.jpg>

Not Included,
1) Persist preemption info across RM restart/HA.
2) FairScheduler related changes to show preemption info on RM app page is not 
covered in this patch.

Any feedback is welcome!

> 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
> 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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