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https://issues.apache.org/jira/browse/YARN-873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13712507#comment-13712507
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Hitesh Shah commented on YARN-873:
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[~xgong] Requiring to parse a string message to determine whether an 
application exists or not is more work as compared to checking $? which can be 
used to indicate various errors such as connection issue/invalid application 
id/app does not exist in RM.
                
> YARNClient.getApplicationReport(unknownAppId) returns a null report
> -------------------------------------------------------------------
>
>                 Key: YARN-873
>                 URL: https://issues.apache.org/jira/browse/YARN-873
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.1.0-beta
>            Reporter: Bikas Saha
>            Assignee: Xuan Gong
>         Attachments: YARN-873.1.patch, YARN-873.2.patch, YARN-873.3.patch
>
>
> How can the client find out that app does not exist?

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