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https://issues.apache.org/jira/browse/SPARK-10554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741229#comment-14741229
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Apache Spark commented on SPARK-10554:
--------------------------------------
User 'nasokan' has created a pull request for this issue:
https://github.com/apache/spark/pull/8720
> Potential NPE with ShutdownHook
> -------------------------------
>
> Key: SPARK-10554
> URL: https://issues.apache.org/jira/browse/SPARK-10554
> Project: Spark
> Issue Type: Bug
> Components: Block Manager
> Affects Versions: 1.5.0
> Reporter: Nithin Asokan
> Priority: Minor
>
> Originally posted in user mailing list
> [here|http://apache-spark-user-list.1001560.n3.nabble.com/Potential-NPE-while-exiting-spark-shell-tt24523.html]
> I'm currently using Spark 1.3.0 on yarn cluster deployed through CDH5.4. My
> cluster does not have a 'default' queue, and launching 'spark-shell' submits
> an yarn application that gets killed immediately because queue does not
> exist. However, the spark-shell session is still in progress after throwing a
> bunch of errors while creating sql context. Upon submitting an 'exit'
> command, there appears to be a NPE from DiskBlockManager with the following
> stack trace
> {code}
> ERROR Utils: Uncaught exception in thread delete Spark local dirs
> java.lang.NullPointerException
> at
> org.apache.spark.storage.DiskBlockManager.org$apache$spark$storage$DiskBlockManager$$doStop(DiskBlockManager.scala:161)
>
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply$mcV$sp(DiskBlockManager.scala:141)
>
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
>
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
>
> at
> org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1617)
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1.run(DiskBlockManager.scala:139)
>
> Exception in thread "delete Spark local dirs" java.lang.NullPointerException
> at
> org.apache.spark.storage.DiskBlockManager.org$apache$spark$storage$DiskBlockManager$$doStop(DiskBlockManager.scala:161)
>
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply$mcV$sp(DiskBlockManager.scala:141)
>
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
>
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
>
> at
> org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1617)
> at
> org.apache.spark.storage.DiskBlockManager$$anon$1.run(DiskBlockManager.scala:139)
>
> {code}
> I believe the problem appears to be surfacing from a shutdown hook that's
> tries to cleanup local directories. In this specific case because the yarn
> application was not submitted successfully, the block manager was not
> registered; as a result it does not have a valid blockManagerId as seen here
> https://github.com/apache/spark/blob/v1.3.0/core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala#L161
> Has anyone faced this issue before? Could this be a problem with the way
> shutdown hook behaves currently?
> Note: I referenced source from apache spark repo than cloudera.
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