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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2395) FairScheduler: Preemption timeout should be configurable per queue
Date Wed, 27 Aug 2014 01:38:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14111722#comment-14111722
] 

Karthik Kambatla commented on YARN-2395:
----------------------------------------

I see the issue now. Thanks for catching it, Ashwin.

Wei and I discussed this offline to see what might be the best way to handle this, and here
is what I think might work: 
# Starved leaf queues will continue to be handled the way they are in the latest patch.
# YARN-2154 changes the behavior for leaf queues to look at actual ResourceRequests and preempt
only matching containers. 
# YARN-2457: For each starved parent queue, pick an application with positive demand and the
least disadvantaged in terms of allocation and preempt containers that match that. 

I propose we get this in and follow up on other items in respective JIRAs. 

> FairScheduler: Preemption timeout should be configurable per queue
> ------------------------------------------------------------------
>
>                 Key: YARN-2395
>                 URL: https://issues.apache.org/jira/browse/YARN-2395
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: fairscheduler
>            Reporter: Ashwin Shankar
>            Assignee: Wei Yan
>         Attachments: YARN-2395-1.patch, YARN-2395-2.patch, YARN-2395-3.patch, YARN-2395-3.patch
>
>
> 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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