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https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516923#comment-15516923
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Eric Payne commented on YARN-2009:
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{quote}
I also thought about this in similar lines. But there was one point which i
thought it may make more sense if we use guaranteed. If queue is under used
than its capacity, our current calculation may consider more resource for
idealAssigned per app. This may yield a lesser value toBePreempted per app
(from lower priority apps). And it may be fine because there some more resource
which is available in queue for other high priority apps. So we may not need to
preempt immediately. Does this make sense?
{quote}
[~sunilg], I'm sorry, but I don't understand. Can you provide a step-by-step
use case to demonstrate your concern?
> 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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