Naganarasimha G R commented on YARN-4452:

Thanks for review comments [~djp],
bq. Given unmanaged application with ATS enabled is not quite mainstream case. 
How about we target for next 2.6/2.7 release and make it critical here (not 
Yes should not be a problem, had only converted from critical to blocker as one 
application was getting the RM down.

bq.  Another thing we may want to fix here is: the NPE happen at 
SystemMetricsPublisher shouldn't bring down RM rudely. Isn't it?
So do we try catch in each of these publishing events ? generally it will not 
happen this was a direct bug in the code . If you feel its required then can 
add it but felt it was not required.

> NPE when submit Unmanaged application
> -------------------------------------
>                 Key: YARN-4452
>                 URL: https://issues.apache.org/jira/browse/YARN-4452
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.7.1, 2.6.2
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>            Priority: Critical
>         Attachments: YARN-4452.v1.001.patch, YARN-4452.v1.002.patch
> As reported in the forum by Wen Lin (w...@pivotal.io)
> {quote}
> [gpadmin@master simple-yarn-app]$ hadoop jar
> ~/hadoop/singlecluster/hadoop/share/hadoop/yarn/hadoop-yarn-applications-unmanaged-am-launcher-
> Client --classpath  ./target/simple-yarn-app-1.1.0.jar -cmd "java
> com.hortonworks.simpleyarnapp.ApplicationMaster /bin/date 2"
> {quote}
> error is coming as 
> {code}
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in 
> handling event type REGISTERED for applicationAttempt
> application_1450079798629_0001
> 664 java.lang.NullPointerException
> 665     at
> org.apache.hadoop.yarn.server.resourcemanager.metrics.SystemMetricsPublisher.appAttemptRegistered(SystemMetricsPublisher.java:143)
> 666     at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$AMRegisteredTransition.transition(RMAppAttemptImpl.java:1365)
> 667     at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$AMRegisteredTransition.transition(RMAppAttemptImpl.java:1341)
> 668     at
> org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:362)
> {code}

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