Ray Chiang commented on YARN-2868:

I had it previously in FSQueueMetrics, then moved it to QueueMetrics based on 
Rohith's feedback, and then determined that I updating CapacityScheduler with 
all the matching queue stuff right now would be potentially in conflict with 
YARN-2986.  I could push the metric back to FSQueueMetrics.

Since this is a MutableRate, the metric shouldn't get clobbered with each app, 
but will get averaged in (unless I'm misunderstanding something).

I'm going to wait on further feedback before I do more editing.

> 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, YARN-2868.007.patch
> Add a metric to measure the latency between "starting container allocation" 
> and "first container actually allocated".

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