Naganarasimha G R updated YARN-3946:
    Attachment: YARN-3946.v1.004.patch

Hi [~wangda]
  *TestAMAuthorization and TestClientRMTokens* test cases are not related to 
this issue and already there are jiras addressing these testcase failures, but 
{{TestApplicationLimitsByPartition}} is related to the patch which i have 
corrected and also have covered one case when application is not assigned to a 
node, diagnostics shows the information of the node and the reason.

> Allow fetching exact reason as to why a submitted app is in ACCEPTED state in 
> CS
> --------------------------------------------------------------------------------
>                 Key: YARN-3946
>                 URL: https://issues.apache.org/jira/browse/YARN-3946
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: capacity scheduler, resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Sumit Nigam
>            Assignee: Naganarasimha G R
>         Attachments: 3946WebImages.zip, YARN-3946.v1.001.patch, 
> YARN-3946.v1.002.patch, YARN-3946.v1.003.Images.zip, YARN-3946.v1.003.patch, 
> YARN-3946.v1.004.patch
> Currently there is no direct way to get the exact reason as to why a 
> submitted app is still in ACCEPTED state. It should be possible to know 
> through RM REST API as to what aspect is not being met - say, queue limits 
> being reached, or core/ memory requirement not being met, or AM limit being 
> reached, etc.

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