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From "Sunil G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Mon, 26 Sep 2016 06:01:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15522161#comment-15522161
] 

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

Thanks [~eepayne] for the detailed explanation. 

bq.when it comes time for the intra-queue preemption policy to preempt resources, it seems
to me that the policy won't preempt enough resources.
Yes. I was also thinking on same line. If {{tq.used}} is less than {{tq.guaranteed}}, then
we may hit less preemption if we use  {{tq.guaranteed}}. Since *used* is less that *guaranteed*,
there are enough resources for this queue. So high priority apps will automatically gets those
resources by scheduler. 
But after thinking more, there is one scenario. Adding to the same scenario, assume another
queue was over-utilizing resource, so current queue has to wait till inter-queue preemption
to kick in. (If inter-queue preemption is turned off, then current queue may not get those
resources immediately. In such cases, I think we need to use  {{tq.used}}. I would like hear
thoughts on this point. [~eepayne] and [~leftnoteasy]. pls share your thoughts.

> 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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