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https://issues.apache.org/jira/browse/YARN-5216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15365085#comment-15365085
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Hitesh Sharma commented on YARN-5216:
-------------------------------------

[~kkaranasos], I'm not sure if subclassing would work. We need to have more 
control on how the opportunistic containers are queued and how we start/preempt 
them. From a design point of view also {{QueuingContainersPreemptionManagerImpl 
}} is not really a queuing container manager, but just a specific way to 
preempt queued opportunistic containers. Thus composition seems a better choice 
here. 

Thank you.

> Expose configurable preemption policy for OPPORTUNISTIC containers running on 
> the NM
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-5216
>                 URL: https://issues.apache.org/jira/browse/YARN-5216
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Arun Suresh
>            Assignee: Hitesh Sharma
>         Attachments: YARN5216.001.patch, yarn5216.002.patch
>
>
> Currently, the default action taken by the QueuingContainerManager, 
> introduced in YARN-2883, when a GUARANTEED Container is scheduled on an NM 
> with OPPORTUNISTIC containers using up resources, is to KILL the running 
> OPPORTUNISTIC containers.
> This JIRA proposes to expose a configurable hook to allow the NM to take a 
> different action.



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