Jian He commented on YARN-4078:

thanks [~Naganarasimha], 
- type cast not needed in TestWorkpreservingRMRestart and 
    YarnScheduler scheduler =
        (YarnScheduler) rm2.getResourceScheduler();
- I think we can expose a getApplicationAttempt in the scheduler interface 
which is more general and so getPendingResourceRequestForAttempt need not be 

> getPendingResourceRequestForAttempt is present in AbstractYarnScheduler 
> should be present in YarnScheduler interface instead  
> -----------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-4078
>                 URL: https://issues.apache.org/jira/browse/YARN-4078
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>            Priority: Minor
>         Attachments: YARN-4078.20150915.patch
> Currently getPendingResourceRequestForAttempt is present in 
> {{AbstractYarnScheduler}}.
> *But in AppInfo,  we are calling this method by typecasting it to 
> AbstractYarnScheduler, which is incorrect.*
> Because if a custom scheduler is to be added, it will implement 
> YarnScheduler, not AbstractYarnScheduler.
> This method should be moved to YarnScheduler or it should have a guarded 
> check like in other places (RMAppAttemptBlock.getBlackListedNodes) 

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