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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2395) Fair Scheduler : implement fair share preemption at parent queue based on fairSharePreemptionTimeout
Date Thu, 07 Aug 2014 20:39:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089802#comment-14089802
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Karthik Kambatla commented on YARN-2395:
----------------------------------------

I think it is a good idea to check for preemption in parent queues as well. However, I am
not convinced about the benefits of allowing different timeouts per queue. The aggressiveness
of preemption can be tuned with the threshold, no? 

> Fair Scheduler : implement fair share preemption at parent queue based on fairSharePreemptionTimeout
> ----------------------------------------------------------------------------------------------------
>
>                 Key: YARN-2395
>                 URL: https://issues.apache.org/jira/browse/YARN-2395
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: fairscheduler
>            Reporter: Ashwin Shankar
>
> Currently in fair scheduler, the preemption logic considers fair share starvation only
at leaf queue level. This jira is created to implement it at the parent queue as well.
> It involves :
> 1. Making "check for fair share starvation" and "amount of resource to preempt"  recursive
such that they traverse the queue hierarchy from root to leaf.
> 2. Currently fairSharePreemptionTimeout is a global config. We could make it configurable
on a per queue basis,so that we can specify different timeouts for parent queues.



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