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From "Ashwin Shankar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2394) Fair Scheduler : ability to configure fairSharePreemptionThreshold per queue
Date Thu, 28 Aug 2014 22:07:09 GMT

    [ https://issues.apache.org/jira/browse/YARN-2394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114455#comment-14114455

Ashwin Shankar commented on YARN-2394:

I have different opinion on this, but I spoke to some guys here, I think we can work around
by setting higher timeouts or slightly lesser threshold(0.8/0.9) at the parent to prevent
aggressive preemption at its children.
So I'm fine with inheriting.

> Fair Scheduler : ability to configure fairSharePreemptionThreshold per queue
> ----------------------------------------------------------------------------
>                 Key: YARN-2394
>                 URL: https://issues.apache.org/jira/browse/YARN-2394
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: fairscheduler
>            Reporter: Ashwin Shankar
>            Assignee: Wei Yan
>         Attachments: YARN-2394-1.patch, YARN-2394-2.patch
> Preemption based on fair share starvation happens when usage of a queue is less than
50% of its fair share. This 50% is hardcoded. We'd like to make this configurable on a per
queue basis, so that we can choose the threshold at which we want to preempt. Calling this
config "fairSharePreemptionThreshold". 

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