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Date: Thu, 28 Aug 2014 03:31:59 +0000 (UTC)
From: "Ashwin Shankar (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12732628.1407434535601.29711.1409196719373@arcas>
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Subject: [jira] [Commented] (YARN-2395) FairScheduler: Preemption timeout
 should be configurable per queue
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    [ https://issues.apache.org/jira/browse/YARN-2395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14113290#comment-14113290 ] 

Ashwin Shankar commented on YARN-2395:
--------------------------------------

[~kasha], I'm fine with the plan. However I'm not very clear on what you plan to do in YARN-2457. I'll ping you later to discuss this. 
Patch looks mostly good.
Couple of questions :
Do we want to introduce backward incompatible change by removing the existing global "fairSharePreemptionTimeout" config ?
Just curious as to why we decided to inherit timeouts ?

One nit :
{code}
// For max share
{code}
This should be fair share.

> 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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