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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Fri, 23 Sep 2016 16:39:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516923#comment-15516923
] 

Eric Payne commented on YARN-2009:
----------------------------------

{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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