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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-4781) Support intra-queue preemption for fairness ordering policy.
Date Tue, 01 May 2018 18:05:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-4781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16459919#comment-16459919
] 

Eric Payne edited comment on YARN-4781 at 5/1/18 6:04 PM:
----------------------------------------------------------

I missed one of the two places that needed a check for {{USERLIMIT_FIRST}}, so I uploaded
a new patch 005.
{quote}If more apps are from same user, older one's will be preempted in a fair manner (which
means to satisfy a younger app, older apps may give some container each). Am I correct?
{quote}
Yes. Basically, youngest containers are preempted from largest apps of the most over-served
users


was (Author: eepayne):
I missed one of the two places that needed a check for {{USERLIMIT_FIRST}, so I uploaded a
new patch 005.
{quote}
If more apps are from same user, older one's will be preempted in a fair manner (which means
to satisfy a younger app, older apps may give some container each). Am I correct?
{quote}
Yes. Basically, youngest containers are preempted from largest apps of the most over-served
users

> Support intra-queue preemption for fairness ordering policy.
> ------------------------------------------------------------
>
>                 Key: YARN-4781
>                 URL: https://issues.apache.org/jira/browse/YARN-4781
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Wangda Tan
>            Assignee: Eric Payne
>            Priority: Major
>         Attachments: YARN-4781.001.patch, YARN-4781.002.patch, YARN-4781.003.patch, YARN-4781.004.patch,
YARN-4781.005.patch
>
>
> We introduced fairness queue policy since YARN-3319, which will let large applications
make progresses and not starve small applications. However, if a large application takes the
queue’s resources, and containers of the large app has long lifespan, small applications
could still wait for resources for long time and SLAs cannot be guaranteed.
> Instead of wait for application release resources on their own, we need to preempt resources
of queue with fairness policy enabled.



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