Anubhav Dhoot commented on YARN-3996:

SchedulerUtils has multiple overloads of normalizeRequests. The ones that take 
in increment and min handle what you are looking to do. 
Fair has support for the increment and Fifo/Capacity do not. So Fair does 
multiple of increment and uses min for min while Fifo/Capacity does multiple of 
min and use min for min. Basically Capacity/Fifo are setting incr also to min. 
We need to do the same in RMAppManager.
That way Fair can continue supporting zero min and use multiple of incr and 
Fifo/Capacity can choose to not support zero min and support multiple of min. 

> YARN-789 (Support for zero capabilities in fairscheduler) is broken after 
> YARN-3305
> -----------------------------------------------------------------------------------
>                 Key: YARN-3996
>                 URL: https://issues.apache.org/jira/browse/YARN-3996
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler, fairscheduler
>            Reporter: Anubhav Dhoot
>            Assignee: Neelesh Srinivas Salian
>            Priority: Critical
> RMAppManager#validateAndCreateResourceRequest calls into normalizeRequest 
> with mininumResource for the incrementResource. This causes normalize to 
> return zero if minimum is set to zero as per YARN-789

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