Jian He commented on YARN-2868:

>From what I understand, both YARN-2802 and this jira are trying to capture the 
>time interval among these states.
YARN-2802 addresses last three states, and this jira is trying to capture the 
time interval between first two. If possible, I think we should make both 
implementations consistent.  
Even, we may consider a generic solution to capture the time interval between 

> 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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