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https://issues.apache.org/jira/browse/YARN-873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702987#comment-13702987
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Zhijie Shen commented on YARN-873:
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bq. Null report can be unclear as to what happened.
IMHO, null is a reasonable indicator of unknown AppId (e.g. null is returned if
Java Map contains no mapping for a key), unless it implies more than one cases.
Checked the code, and found null is just returned when the RMApp is not found
in rmContext, such that it indicates a unique case.
> 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
>
> How can the client find out that app does not exist?
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