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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7469) Capacity Scheduler Intra-queue preemption: User can starve if newest app is exactly at user limit
Date Wed, 15 Nov 2017 16:18:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16253721#comment-16253721
] 

Eric Payne commented on YARN-7469:
----------------------------------

bq.  now min container is the dead zone here
I filed YARN-7501 to include a "dead zone" around the user limit.

bq. in 2.8, this fix has a problem of oscillation due to the difference in how user limit
is calculated between 2.8 and later releases. 
[~sunilg], I think this patch should be used to fix the user starvation problem and the 2.8-specific
oscillation problem can be handled by YARN-7496. {{YARN-7469.001.patch}} will apply cleanly
to all branches back to branch-2.8.

> Capacity Scheduler Intra-queue preemption: User can starve if newest app is exactly at
user limit
> -------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7469
>                 URL: https://issues.apache.org/jira/browse/YARN-7469
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, yarn
>    Affects Versions: 2.9.0, 3.0.0-beta1, 2.8.2
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>         Attachments: UnitTestToShowStarvedUser.patch, YARN-7469.001.patch
>
>
> Queue Configuration:
> - Total Memory: 20GB
> - 2 Queues
> -- Queue1
> --- Memory: 10GB
> --- MULP: 10%
> --- ULF: 2.0
> - Minimum Container Size: 0.5GB
> Use Case:
> - User1 submits app1 to Queue1 and consumes 20GB
> - User2 submits app2 to Queue1 and requests 7.5GB
> - Preemption monitor preempts 7.5GB from app1. Capacity Scheduler gives those resources
to User2
> - User 3 submits app3 to Queue1. To begin with, app3 is requesting 1 container for the
AM.
> - Preemption monitor never preempts a container.



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