Wangda Tan commented on YARN-2868:

Just reviewed patch, I'm not sure if you misunderstood what I and Karthik 
meant. I agree with what you mentioned in 
 (comment#1) and also Karthik's comment: 
 It's better to keep AtomicLong as what you originally done. Lock application 
from caller is not clear to me.


> Add metric for initial container launch time
> --------------------------------------------
>                 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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