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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4945) [Umbrella] Capacity Scheduler Preemption Within a queue
Date Thu, 14 Apr 2016 18:31:25 GMT

    [ https://issues.apache.org/jira/browse/YARN-4945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15241683#comment-15241683
] 

Eric Payne commented on YARN-4945:
----------------------------------

Thanks [~leftnoteasy]. I have seen the following use case where intra-queue preemption would
be necessary. [~sunilg] / [~leftnoteasy], please provide additional use cases as you think
of them.

- {{QueueA}} has 100 resources with {{User Limit Factor = 1.0}} and {{User Limit % = 20%}}
- The whole cluster is full.
- User X's apps launch 100 containers that run for 24 hours
- User Y wants to launch an app, but even though User Y should expect at least 20% of {{QueueA}},
they can't get any resources because the cluster is full and User X won't give any up.

> [Umbrella] Capacity Scheduler Preemption Within a queue
> -------------------------------------------------------
>
>                 Key: YARN-4945
>                 URL: https://issues.apache.org/jira/browse/YARN-4945
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Wangda Tan
>
> This is umbrella ticket to track efforts of preemption within a queue to support features
like:
> YARN-2009. YARN-2113. YARN-4781.



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