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https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504991#comment-15504991
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Wangda Tan commented on YARN-2009:
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And one additional note about why balancing user-usage only in preemption logic
will cause excessive preemption.
Continue above 3-users example.
If the preemption policy compute and set 4 (4 = 12 / 3) for ideal allocation of
user A/B/C. So it may preempt some resource from A/B to make room for C. But
when scheduler doing allocation. because A/B sit in front of the queue,
resource will come back to A/B again.
> 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
>
>
> 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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