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https://issues.apache.org/jira/browse/YARN-3143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated YARN-3143:
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    Attachment: YARN-3143.001.patch

Patch to skip non-existent apps as we're walking the app reports.

> RM Apps REST API can return NPE or entries missing id and other fields
> ----------------------------------------------------------------------
>
>                 Key: YARN-3143
>                 URL: https://issues.apache.org/jira/browse/YARN-3143
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: webapp
>    Affects Versions: 2.5.2
>            Reporter: Kendall Thrapp
>            Assignee: Jason Lowe
>         Attachments: YARN-3143.001.patch
>
>
> I'm seeing intermittent null pointer exceptions being returned by
> the YARN Apps REST API.
> For example:
> {code}
> http://{cluster}:{port}/ws/v1/cluster/apps?finalStatus=UNDEFINED
> {code}
> JSON Response was:
> {code}
> {"RemoteException":{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException"}}
> {code}
> At a glance appears to be only when we query for unfinished apps (i.e. 
> finalStatus=UNDEFINED).  
> Possibly related, when I do get back a list of apps, sometimes one or more of 
> the apps will be missing most of the fields, like id, name, user, etc., and 
> the fields that are present all have zero for the value.  
> For example:
> {code}
> {"progress":0.0,"clusterId":0,"applicationTags":"","startedTime":0,"finishedTime":0,"elapsedTime":0,"allocatedMB":0,"allocatedVCores":0,"runningContainers":0,"preemptedResourceMB":0,"preemptedResourceVCores":0,"numNonAMContainerPreempted":0,"numAMContainerPreempted":0}
> {code}
> Let me know if there's any other information I can provide to help debug.



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