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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1707) Making the CapacityScheduler more dynamic
Date Thu, 20 Mar 2014 18:48:45 GMT

    [ https://issues.apache.org/jira/browse/YARN-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942119#comment-13942119
] 

Arun C Murthy commented on YARN-1707:
-------------------------------------

I'm very supportive of features like removing queues (adding is already supported).

However, as I just commented on YARN-1051, I think we are better of relying on enhancing/reducing
priorities rather than adding/removing queues.

> Making the CapacityScheduler more dynamic
> -----------------------------------------
>
>                 Key: YARN-1707
>                 URL: https://issues.apache.org/jira/browse/YARN-1707
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacityscheduler
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>
> The CapacityScheduler is a rather static at the moment, and refreshqueue provides a rather
heavy-handed way to reconfigure it. Moving towards long-running services (tracked in YARN-896)
and to enable more advanced admission control and resource parcelling we need to make the
CapacityScheduler more dynamic. This is instrumental to the umbrella jira YARN-1051.
> Concretely this require the following changes:
> * create queues dynamically
> * destroy queues dynamically
> * dynamically change queue parameters (e.g., capacity) 
> * modify refreshqueue validation to enforce sum(child.getCapacity())<= 100% instead
of ==100%
> We limit this to LeafQueues. 



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