Craig Welch created YARN-3510:

             Summary: Create an extension of 
ProportionalCapacityPreemptionPolicy which preempts a number of containers from 
each application in a way which respects fairness
                 Key: YARN-3510
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: yarn
            Reporter: Craig Welch
            Assignee: Craig Welch

The ProportionalCapacityPreemptionPolicy preempts as many containers from 
applications as it can during it's preemption run.  For fifo this makes sense, 
as it is prempting in reverse order & therefore maintaining the primacy of the 
"oldest".  For fair ordering this does not have the desired effect - instead, 
it should preempt a number of containers from each application which maintains 
a fair balance /close to a fair balance between them

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