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From nasokan <anithi...@gmail.com>
Subject Potential NPE while exiting spark-shell
Date Mon, 31 Aug 2015 18:39:44 GMT
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

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)

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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