Craig Welch commented on YARN-3293:

   General - it looks like the counters could possibly overflow and provide 
negative values, perhaps this is not something which could possibly happen in 
the lifetime of a cluster, but a large long-running cluster, is it a 
   This presently looks to be capasched only, had a suggestion to make slightly 
more general below, [~vinodkv] also mentioned "not specific to scheduler", 
perhaps it's fine to go capasched only for the first iteration, but wanted to 
verify (perhaps we need a followon jira for other schedulers).  
    on the web page
      It's a nit, but I find I don't like the look of the / between the counter 
and the resource expression where that occurs, maybe - instead of / for those 
      can we import Nodemanager & get rid of package references in code
      looks like there is no need to keep a reference to the CapacityScheduler 
instance after construction, can we drop it 
      from being a member then?
      looks like line changes in info log are just whitespace, can you drop 
      L884 looks to be just whitespace, can you revert?
      I think that there should be a new, gsharable between schedulers class 
which incorporates all the new assignment info and that it should be a member 
of CSAssignment, instead of adding all of the  details directly to 
CSAssignment.  You would still pack the info into CSAssignment (as an instance 
of that type), but now would take a form that can be shared across schedulers

> Track and display capacity scheduler health metrics in web UI
> -------------------------------------------------------------
>                 Key: YARN-3293
>                 URL: https://issues.apache.org/jira/browse/YARN-3293
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler
>            Reporter: Varun Vasudev
>            Assignee: Varun Vasudev
>         Attachments: Screen Shot 2015-03-30 at 4.30.14 PM.png, 
> apache-yarn-3293.0.patch, apache-yarn-3293.1.patch, apache-yarn-3293.2.patch
> It would be good to display metrics that let users know about the health of 
> the capacity scheduler in the web UI. Today it is hard to get an idea if the 
> capacity scheduler is functioning correctly. Metrics such as the time for the 
> last allocation, etc.

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