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https://issues.apache.org/jira/browse/SPARK-8754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609842#comment-14609842
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Apache Spark commented on SPARK-8754:
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User 'devaraj-kavali' has created a pull request for this issue:
https://github.com/apache/spark/pull/7153
> YarnClientSchedulerBackend doesn't stop gracefully in failure conditions
> ------------------------------------------------------------------------
>
> Key: SPARK-8754
> URL: https://issues.apache.org/jira/browse/SPARK-8754
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 1.4.0
> Reporter: Devaraj K
> Priority: Minor
>
> {code:xml}
> java.lang.NullPointerException
> at
> org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.stop(YarnClientSchedulerBackend.scala:151)
> at
> org.apache.spark.scheduler.TaskSchedulerImpl.stop(TaskSchedulerImpl.scala:421)
> at
> org.apache.spark.scheduler.DAGScheduler.stop(DAGScheduler.scala:1447)
> at org.apache.spark.SparkContext.stop(SparkContext.scala:1651)
> at org.apache.spark.SparkContext.<init>(SparkContext.scala:572)
> at org.apache.spark.examples.SparkPi$.main(SparkPi.scala:28)
> at org.apache.spark.examples.SparkPi.main(SparkPi.scala)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:621)
> at
> org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:170)
> at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:193)
> at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:112)
> at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
> {code}
> If the application has FINISHED/FAILED/KILLED or failed to launch application
> master, monitorThread is not getting initialized but
> monitorThread.interrupt() is getting invoked as part of stop() without any
> check and It is causing to throw NPE and also it is preventing to stop the
> client.
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