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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Thu, 22 Sep 2016 20:33:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514405#comment-15514405
] 

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:

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

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 resource). 

Plz let me know if I missed anything.

Thanks,

> 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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