Karthik Kambatla commented on YARN-4314:

bq. I feel adding timestamp to each resource request will be costly and all the 
existing applications will need to migrate to use this metric.
I was not suggesting the AM set it. It might not be a bad idea to let the AMs 
set it optionally. 

I was thinking the RM could set this on receiving a ResourceRequest, and use it 
to determine duration.

> Adding container wait time as a metric at queue level and application level.
> ----------------------------------------------------------------------------
>                 Key: YARN-4314
>                 URL: https://issues.apache.org/jira/browse/YARN-4314
>             Project: Hadoop YARN
>          Issue Type: New Feature
>            Reporter: Lavkesh Lahngir
>            Assignee: Lavkesh Lahngir
> There is a need for adding the container wait-time which can be tracked at 
> the queue and application level. 
> An application can have two kinds of wait times. One is AM wait time after 
> submission and another is total container wait time between AM asking for 
> containers and getting them. 

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