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https://issues.apache.org/jira/browse/YARN-1011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076750#comment-15076750
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Karthik Kambatla commented on YARN-1011:
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Forgot to respond to one comment:

bq. when terminating opportunistic containers will the RM ask the AM about 
which containers to kill?
Don't think we should. NM --> RM --> AM --> NM is a long communication thread. 
Our preemption should kick in much faster that that. What do you think of 
preempting the last opportunistic container that was started, since it is 
likely that far away from promotion. 



> [Umbrella] Schedule containers based on utilization of currently allocated 
> containers
> -------------------------------------------------------------------------------------
>
>                 Key: YARN-1011
>                 URL: https://issues.apache.org/jira/browse/YARN-1011
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Arun C Murthy
>         Attachments: yarn-1011-design-v0.pdf
>
>
> Currently RM allocates containers and assumes resources allocated are 
> utilized.
> RM can, and should, get to a point where it measures utilization of allocated 
> containers and, if appropriate, allocate more (speculative?) containers.



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