Ray Chiang commented on YARN-2868:

[~rohithsharma], it looks like CapacityScheduler/AbstractYarnScheduler is 
missing a couple of things needed to record container launch time.  The Clock 
stuff is easy to add, but the queue related stuff looks like it could get 
complicated.  I think I'd rather wait for YARN-2986 before this JIRA is 
implemented in CapacityScheduler.  I can open a new JIRA for that once this one 
is done.

Does that sound reasonable?

> Add metric for initial container launch time to FairScheduler
> -------------------------------------------------------------
>                 Key: YARN-2868
>                 URL: https://issues.apache.org/jira/browse/YARN-2868
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Ray Chiang
>            Assignee: Ray Chiang
>              Labels: metrics, supportability
>         Attachments: YARN-2868-01.patch, YARN-2868.002.patch, 
> YARN-2868.003.patch, YARN-2868.004.patch, YARN-2868.005.patch, 
> YARN-2868.006.patch
> Add a metric to measure the latency between "starting container allocation" 
> and "first container actually allocated".

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