Kendall Thrapp created YARN-3143:
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             Summary: 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


I'm seeing intermittent null pointer exceptions being returned by
the YARN Apps REST API.

For example:
http://{cluster}:{port}/ws/v1/cluster/apps?finalStatus=UNDEFINED

JSON Response was:
{"RemoteException":{"exception":"NullPointerException","javaClassName":"java.lang.NullPointerException"}}

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:
{"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}

Let me know if there's any other information I can provide to help debug.



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