Karthik Kambatla commented on YARN-1011:

bq. For resource oversubscription enable/disable for individual nodes, I think 
it's very important since some nodes could be more important than others. Do 
you think is it fine to add a configuration item to each NM's yarn-site.xml?
That is exactly the intent. Let us continue this conversation on YARN-4512. 

bq. For scheduler-side implementation, instead of modifying individual 
scheduler, I think we should try to add over-subscription policy to common 
scheduling layer since it doesn't sounds very related to specific scheduler 
Makes sense. Doubt there is any scheduler-specific smarts here. If at all we 
need to do them separately, it is most likely because our scheduler 
abstractions are not clean. 

> [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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