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https://issues.apache.org/jira/browse/YARN-2900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14223552#comment-14223552
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Jonathan Eagles commented on YARN-2900:
---------------------------------------

Application not found in the history store should be a normal case and not an 
exceptional in the REST api case since the application id is user provided 
information.

> Application Not Found in AHS throws Internal Server Error with NPE
> ------------------------------------------------------------------
>
>                 Key: YARN-2900
>                 URL: https://issues.apache.org/jira/browse/YARN-2900
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Jonathan Eagles
>            Assignee: Mit Desai
>
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryManagerImpl.convertToApplicationReport(ApplicationHistoryManagerImpl.java:128)
>       at 
> org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryManagerImpl.getApplication(ApplicationHistoryManagerImpl.java:118)
>       at 
> org.apache.hadoop.yarn.server.webapp.WebServices$2.run(WebServices.java:222)
>       at 
> org.apache.hadoop.yarn.server.webapp.WebServices$2.run(WebServices.java:219)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1679)
>       at 
> org.apache.hadoop.yarn.server.webapp.WebServices.getApp(WebServices.java:218)
>       ... 59 more



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