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https://issues.apache.org/jira/browse/SPARK-3014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096330#comment-14096330
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Apache Spark commented on SPARK-3014:
-------------------------------------

User 'sryza' has created a pull request for this issue:
https://github.com/apache/spark/pull/1934

> Log a more informative messages in a couple failure scenarios
> -------------------------------------------------------------
>
>                 Key: SPARK-3014
>                 URL: https://issues.apache.org/jira/browse/SPARK-3014
>             Project: Spark
>          Issue Type: Improvement
>          Components: YARN
>    Affects Versions: 1.0.2
>            Reporter: Sandy Ryza
>            Priority: Minor
>
> This is what shows up currently when the user code fails to initialize a 
> SparkContext when running in yarn-cluster mode:
> {code}
> Exception in thread "Thread-4" java.lang.NullPointerException
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at 
> org.apache.spark.deploy.yarn.ApplicationMaster$$anon$2.run(ApplicationMaster.scala:187)
> Exception in thread "main" java.lang.AssertionError: assertion failed
>       at scala.Predef$.assert(Predef.scala:165)
>       at 
> org.apache.spark.deploy.yarn.ApplicationMaster.waitForSparkContextInitialized(ApplicationMaster.scala:223)
>       at 
> org.apache.spark.deploy.yarn.ApplicationMaster.run(ApplicationMaster.scala:112)
>       at 
> org.apache.spark.deploy.yarn.ApplicationMaster$$anonfun$main$1.apply$mcV$sp(ApplicationMaster.scala:470)
>       at 
> org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:53)
>       at 
> org.apache.spark.deploy.SparkHadoopUtil$$anon$1.run(SparkHadoopUtil.scala:52)
>       at java.security.AccessController.doPrivileged(Native Method)
>       at javax.security.auth.Subject.doAs(Subject.java:415)
>       at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1554)
>       at 
> org.apache.spark.deploy.SparkHadoopUtil.runAsSparkUser(SparkHadoopUtil.scala:52)
>       at 
> org.apache.spark.deploy.yarn.ApplicationMaster$.main(ApplicationMaster.scala:469)
>       at 
> org.apache.spark.deploy.yarn.ApplicationMaster.main(ApplicationMaster.scala)
> {code}
> This is what shows up when the main method isn't static:
> {code}
> Exception in thread "main" java.lang.NullPointerException
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:606)
>       at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:292)
>       at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:55)
>       at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
> {code}



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