Wangda Tan commented on YARN-2868:

Hmm, I think it may not good enough to put in QueueMetrics (I just noticed 
this). Every new app will overwrite this value, which is confusing to me, also 
to end users. When you look at metrics fields in QueueMetrics, all of them are 
generic metrics of a queue, but this field seems not so generic to me.

Is there any must-have reason or use cases to add it to QueueMetrics or 
alternatively you can add an "application-metrics" so you can add it there?

> 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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