Wangda Tan commented on YARN-2618:

Hi [~kasha],
bq. I haven't looked at the CS code much, but it appears the scheduling 
decisions use DRC#divide which only looks at memory. Wangda Tan - any thoughts 
Does "DRC" means "Default..." or "Dominant..."? By default CS uses 
{{DefaultResourceCalculator}}, but it can also support not over-allocation of 
CPU when  {{DominantResourceCalculator}} configured. 

Could you please confirm about this, [~vvasudev]?

> Avoid over-allocation of disk resources
> ---------------------------------------
>                 Key: YARN-2618
>                 URL: https://issues.apache.org/jira/browse/YARN-2618
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wei Yan
>            Assignee: Wei Yan
>         Attachments: YARN-2618-1.patch, YARN-2618-2.patch
> Subtask of YARN-2139. 
> This should include
> - Add API support for introducing disk I/O as the 3rd type resource.
> - NM should report this information to the RM
> - RM should consider this to avoid over-allocation

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