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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2009) Priority support for preemption in ProportionalCapacityPreemptionPolicy
Date Mon, 19 Sep 2016 22:25:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-2009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504876#comment-15504876
] 

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

[~sunilg] / [~leftnoteasy]
I am still in the middle of reviewing the patch, but I have a couple of overall concerns about
the design of {{FifoIntraQueuePreemptionPolicy#computeAppsIdealAllocation}}
- If we will be combining FIFO priority and FIFO MULP preemption, then I don't think {{idealAssigned}}
can be calculated independently from each other:
-- I think that all apps in a queue should be grouped according to user {{Map<user, applications>}}
-- I think there should be a separate {{TAMinUserLimitPctComparator}} that calculates underserved
users based on min user limit percent.
--- Comparator would try to balance MULP across all users like the Capacity Scheduler does
-- I think {{TAPriorityComparator}} should then only be given apps from the same user.
- Once we have {{idalAssigned}} per user, then we can divide that up among apps belonging
to that user.

> 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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