Ravi Prakash commented on YARN-977:

Is this related to YARN-1856? 

> Interface for users/AM to know actual usage by the container
> ------------------------------------------------------------
>                 Key: YARN-977
>                 URL: https://issues.apache.org/jira/browse/YARN-977
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Omkar Vinit Joshi
> Today we allocate resource (memory and cpu) and node manager starts the 
> container with requested resource [I am assuming they are using cgroups]. But 
> there is definitely a possibility of users requesting more than what they 
> actually may need during the execution of their container/job-task. If we add 
> a way for users/AM to know the actual usage of the requested/completed 
> container then they may optimize it for next run..
> This will be helpful for AM to optimize cpu/memory resource requests by 
> querying NM/RM to know avg/max cpu/memory usage of the container or may be 
> containers belonging to application.

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