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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3054) Preempt policy in FairScheduler may cause mapreduce job never finish
Date Fri, 11 Mar 2016 22:03:02 GMT

    [ https://issues.apache.org/jira/browse/YARN-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15191554#comment-15191554
] 

Karthik Kambatla commented on YARN-3054:
----------------------------------------

Also, the approach being proposed on YARN-4752 doesn't take container priority into consideration
anymore. So, we shouldn't systemic bias towards preempting low priority containers. 

> Preempt policy in FairScheduler may cause mapreduce job never finish
> --------------------------------------------------------------------
>
>                 Key: YARN-3054
>                 URL: https://issues.apache.org/jira/browse/YARN-3054
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: fairscheduler
>    Affects Versions: 2.6.0
>            Reporter: Peng Zhang
>
> Preemption policy is related with schedule policy now. Using comparator of schedule policy
to find preemption candidate cannot guarantee a subset of containers never be preempted. And
this may cause tasks to be preempted periodically before they finish. So job cannot make any
progress. 
> I think preemption in YARN should got below assurance:
> 1. Mapreduce jobs can get additional resources when others are idle;
> 2. Mapreduce jobs for one user in one queue can still progress with its min share when
others preempt resources back.
> Maybe always preempt the latest app and container can get this? 



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