Vinod Kumar Vavilapalli updated YARN-1957:

    Issue Type: Sub-task  (was: Bug)
        Parent: YARN-45

> ProportionalCapacitPreemptionPolicy handling of corner cases...
> ---------------------------------------------------------------
>                 Key: YARN-1957
>                 URL: https://issues.apache.org/jira/browse/YARN-1957
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.4.0
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>              Labels: capacity-scheduler, preemption
>         Attachments: YARN-1957.patch, YARN-1957.patch, YARN-1957_test.patch
> The current version of ProportionalCapacityPreemptionPolicy should be 
> improved to deal with the following two scenarios:
> 1) when rebalancing over-capacity allocations, it potentially preempts 
> without considering the maxCapacity constraints of a queue (i.e., preempting 
> possibly more than strictly necessary)
> 2) a zero capacity queue is preempted even if there is no demand (coherent 
> with old use of zero-capacity to disabled queues)
> The proposed patch fixes both issues, and introduce few new test cases.

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