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From "Xianyin Xin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4752) [Umbrella] FairScheduler: Improve preemption
Date Mon, 07 Mar 2016 04:28:40 GMT

    [ https://issues.apache.org/jira/browse/YARN-4752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15182566#comment-15182566
] 

Xianyin Xin commented on YARN-4752:
-----------------------------------

hi [~kasha], can we consider to decouple the scheduling and preemption using the same {{getResourceUsage()
}} as it block YARN-4120 and YARN-4090 which aims to improve the scheduling throughput? As
discussed in YARN-4120, see, e.g, https://issues.apache.org/jira/browse/YARN-4120?focusedCommentId=14733235&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14733235.

Thanks.

> [Umbrella] FairScheduler: Improve preemption
> --------------------------------------------
>
>                 Key: YARN-4752
>                 URL: https://issues.apache.org/jira/browse/YARN-4752
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>
> A number of issues have been reported with respect to preemption in FairScheduler along
the lines of:
> # FairScheduler preempts resources from nodes even if the resultant free resources cannot
fit the incoming request.
> # Preemption doesn't preempt from sibling queues
> # Preemption doesn't preempt from sibling apps under the same queue that is over its
fairshare
> # ...
> Filing this umbrella JIRA to group all the issues together and think of a comprehensive
solution.



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