Sandy Ryza commented on YARN-2274:

Demanded resources could also be a useful statistic to report.  The update 
thread typically runs twice every second, so it might make sense to 5th update 
or something to avoid a flood of messages.

> FairScheduler: Add debug information about cluster capacity, availability and 
> reservations
> ------------------------------------------------------------------------------------------
>                 Key: YARN-2274
>                 URL: https://issues.apache.org/jira/browse/YARN-2274
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>    Affects Versions: 2.4.1
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Trivial
>         Attachments: yarn-2274-1.patch
> FairScheduler logs have little information on cluster capacity and 
> availability. Need this information to debug production issues. 

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