Anubhav Dhoot commented on YARN-1959:

The queue fair share for fifo and fair policies, sets CPU to zero always. Thus 
using DRF calculations would cause the headroom to always be set to zero CPU. 
That can be incorrectly interpreted by the user as having no headroom for CPU 
(instead of don't care about CPU headroom). 

> Fix headroom calculation in Fair Scheduler
> ------------------------------------------
>                 Key: YARN-1959
>                 URL: https://issues.apache.org/jira/browse/YARN-1959
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Sandy Ryza
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-1959.001.patch, YARN-1959.prelim.patch
> The Fair Scheduler currently always sets the headroom to 0.

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