Chang Li created YARN-4218:

             Summary: Metric for resource*time that was preempted
                 Key: YARN-4218
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Chang Li
            Assignee: Chang Li
         Attachments: YHADOOP-631.wip.patch

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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