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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Wed, 26 Oct 2016 17:06:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15609030#comment-15609030

Eric Payne commented on YARN-2009:

[~sunilg], I am still analyzing the code, but I do want to point out one concern that I have.

{{TestProportionalCapacityPreemptionPolicyIntraQueue#testPreemptionWithTwoUsers}}: In this
test, the user limit resource is 30, and  {{app3}} has 40 resources. So, at most, I would
expect only 10 resources to be preempted from {{app3}}, which would bring {{app3}} down to
30 resources to match the ULR. Instead, 25 resources were preempted. I feel that {{FifoIntraQueuePreemptionPlugin#calculateIdealAssignedResourcePerApp}}
should not allow {{tmpApp.idealAssigned}} to be lower than the ULR.

One more thing I noticed during my manual testing is that although the unnecessary preemption
is a lot less, there are cases where it still happens. I haven't drilled down yet.

> 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, YARN-2009.0008.patch,
YARN-2009.0009.patch, YARN-2009.0010.patch, YARN-2009.0011.patch, YARN-2009.0012.patch, YARN-2009.0013.patch,
YARN-2009.0014.patch, YARN-2009.0015.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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