Chang Li updated YARN-4218:
    Attachment: screenshot-3.png

> Metric for resource*time that was preempted
> -------------------------------------------
>                 Key: YARN-4218
>                 URL: https://issues.apache.org/jira/browse/YARN-4218
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Chang Li
>            Assignee: Chang Li
>         Attachments: YARN-4218.patch, YARN-4218.wip.patch, screenshot-1.png, 
> screenshot-2.png, screenshot-3.png
> After YARN-415 we have the ability to track the resource*time footprint of a 
> job and preemption metrics shows how many containers were preempted on a job. 
> However we don't have a metric showing the resource*time footprint cost of 
> preemption. In other words, we know how many containers were preempted but we 
> don't have a good measure of how much work was lost as a result of preemption.
> We should add this metric so we can analyze how much work preemption is 
> costing on a grid and better track which jobs were heavily impacted by it. A 
> job that has 100 containers preempted that only lasted a minute each and were 
> very small is going to be less impacted than a job that only lost a single 
> container but that container was huge and had been running for 3 days.

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