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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Sat, 15 Oct 2016 01:53:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15577129#comment-15577129
] 

Sunil G commented on YARN-2009:
-------------------------------

Thanks [~eepayne]
I also ran into a similar point yesterday and found root cause is because we subtract {{tmpApp.getAMUsed()}}.


I found a solution to have something similar to 
{{noformat}}
      if (Resources.lessThan(rc, clusterResource,
            Resources.subtract(tmpApp.getUsed(), preemtableFromApp),
            tmpApp.getAMUsed())) {
        Resources.subtractFrom(preemtableFromApp, tmpApp.getAMUsed());
      }
{{noformat}}

I think this can be placed in {{FifoIntraQueuePreemptionPlugin.validateOutSameAppPriorityFromDemand}},
so we can ensure that we will deduct AMUsed only when one app's resource is needed fully for
preemption. Else we may not needed to consider the same. I am preparing for UTs also to cover
this cases.

> 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, YARN-2009.0003.patch,
YARN-2009.0004.patch, YARN-2009.0005.patch, YARN-2009.0006.patch, YARN-2009.0007.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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