Wangda Tan commented on YARN-2009:

Hi [~eepayne],

bq. If Queue1 has 100 resources, and if user1 starts app1 at priority 1 that 
consumes the whole queue, won't user1's user-limit-resource be 100? Then, if 
user1 starts another app (app2) at priority 2, won't the above algorithm skip 
over app2 because user1 has already achieved its user-limit-resource?

For your concern, I previously mentioned in the pseudo code:

    // initial all value to 0
    Map<String, Resource> user-to-allocated;

Initially user-to-allocated is set to 0, and when we loop applications, we will 
go to app2 first, so app2's ideal-allocation becomes 100 and app1's 
ideal-allocation will be updated to 0. (Assume app2 has >= 100 pending 

Plz let me know if I missed anything.


> Priority support for preemption in ProportionalCapacityPreemptionPolicy
> -----------------------------------------------------------------------
>                 Key: YARN-2009
>                 URL: https://issues.apache.org/jira/browse/YARN-2009
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Devaraj K
>            Assignee: Sunil G
>         Attachments: YARN-2009.0001.patch, YARN-2009.0002.patch
> While preempting containers based on the queue ideal assignment, we may need 
> to consider preempting the low priority application containers first.

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