Rohith commented on YARN-3273:

bq. The headroom need not be part of RMAppAttemptMetrics, as it only makes 
sense for running apps
I will verify in latest trunk and change accordingly.

bq. CapacitySchedulerLeafQueueInfo#aMResourceLimit - this is not part of your 
patch; would you mind changing the “a” to “A” here. The name is important as 
it’s exposed in rest api
OK, will change in next patch.

bq. Regarding the per user info: do you think it’s useful to have a separate 
top-level users link on the front page within which we show a list of users 
info such as totalResourceUsage, amResourceUsage, totalResourceLimit, 
This is good Idea. I think we can keep existing as it is i.e *Used Application 
Master Resources Per User* , *Used Application Master Resources:* and *Max 
Resources Per User:* because if no active users are there then this dispaly 
And separate user table that display content of ActiveUsers info along with 
TotalResourceLimit for user and AMResourceLimit for User. Any more fields need 
to add here?
||Users||ResourceLimit||Used Resource||AMResourceLimit||User 

bq. We have a LeafQueue#computeUserLimit method to compute user-limit; we may 
add a new resourceLimit field in LeafQueue#User class and when 
LeafQueue#computeUserLimit is called, set the resourceLimit into 

> Improve web UI to facilitate scheduling analysis and debugging
> --------------------------------------------------------------
>                 Key: YARN-3273
>                 URL: https://issues.apache.org/jira/browse/YARN-3273
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Jian He
>            Assignee: Rohith
>         Attachments: 0001-YARN-3273-v1.patch, 
> YARN-3273-am-resource-used-AND-User-limit.PNG, 
> YARN-3273-application-headroom.PNG
> Job may be stuck for reasons such as:
> - hitting queue capacity 
> - hitting user-limit, 
> - hitting AM-resource-percentage 
> The  first queueCapacity is already shown on the UI.
> We may surface things like:
> - what is user's current usage and user-limit; 
> - what is the AM resource usage and limit;
> - what is the application's current HeadRoom;

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