Anubhav Dhoot commented on YARN-2868:

Hi [~leftnoteasy] 
RMAppMetrics will be interesting for us to add to metrics. We will get even 
more granular data than just queue related metrics. But unless we also add it 
to a queue metrics it will again not serve the purpose of this jira.
Our scenario is debugging queue related issues for which we need queue related 
metrics because scheduling decisions are made based on the queue. What would be 
a good place to add metrics for all those queue related metrics? 

> 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: Anubhav Dhoot
>              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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