Sunil G created YARN-4091:

             Summary: Improvement: Introduce more debug/diagnostics information 
to detail out scheduler activity
                 Key: YARN-4091
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: capacity scheduler, resourcemanager
    Affects Versions: 2.7.0
            Reporter: Sunil G
            Assignee: Sunil G

As schedulers are improved with various new capabilities, more configurations 
which tunes the schedulers starts to take actions such as limit assigning 
containers to an application, or introduce delay to allocate container etc. 
There are no clear information passed down from scheduler to outerworld under 
these various scenarios. This makes debugging very tougher.

This ticket is an effort to introduce more defined states on various parts in 
scheduler where it skips/rejects container assignment, activate application 
etc. Such information will help user to know whats happening in scheduler.

Attaching a short proposal for initial discussion. We would like to improve on 
this as we discuss.

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