Bikas Saha commented on YARN-2139:

Thanks for the update.
Its not clear to me how we are going to clearly de-couple 1) and 2) from 3). 
From first thoughts, scheduling is what prevents over-allocation and the NM 
enforces the scheduling decision.
Could you please throw some light on that?

> [Umbrella] Support for Disk as a Resource in YARN 
> --------------------------------------------------
>                 Key: YARN-2139
>                 URL: https://issues.apache.org/jira/browse/YARN-2139
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Wei Yan
>         Attachments: Disk_IO_Isolation_Scheduling_3.pdf, 
> Disk_IO_Scheduling_Design_1.pdf, Disk_IO_Scheduling_Design_2.pdf, 
> YARN-2139-prototype-2.patch, YARN-2139-prototype.patch
> YARN should consider disk as another resource for (1) scheduling tasks on 
> nodes, (2) isolation at runtime, (3) spindle locality. 

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