Xuan Gong commented on YARN-3284:

bq. For displaying application headroom for running applications( one of the 
point in YARN-3273), it is required to expose applicationHeadroom field in the 
ApplicationAttemptMetrics.java. Would you please mind adding this field in your 
patch that helps retrieve headroom?

Added. But use the default value: Resource.newInstance(0,0). We could replace 
it with the real value in YARN-3273

> Expose more ApplicationMetrics and ApplicationAttemptMetrics through YARN 
> command
> ---------------------------------------------------------------------------------
>                 Key: YARN-3284
>                 URL: https://issues.apache.org/jira/browse/YARN-3284
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>         Attachments: YARN-3284.1.patch, YARN-3284.1.patch, YARN-3284.2.patch, 
> YARN-3284.3.patch
> Current, we have some extra metrics about the application and current attempt 
> in RM Web UI. We should expose that information through YARN Command, too.
> 1. Preemption metrics
> 2. application outstanding resource requests
> 3. container locality info

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