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https://issues.apache.org/jira/browse/YARN-4091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14720243#comment-14720243
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Sunil G commented on YARN-4091:
-------------------------------

Thank you [~Naganarasimha] for linking this issue. yes, this will be a subset 
here.

> Improvement: Introduce more debug/diagnostics information to detail out 
> scheduler activity
> ------------------------------------------------------------------------------------------
>
>                 Key: YARN-4091
>                 URL: https://issues.apache.org/jira/browse/YARN-4091
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacity scheduler, resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Sunil G
>            Assignee: Sunil G
>         Attachments: Improvement on debugdiagnostic information - YARN.pdf
>
>
> 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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