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. -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/Potential-NPE-while-exiting-spark-shell-tp24523.html Sent from the Apache Spark User List mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@spark.apache.org For additional commands, e-mail: user-h...@spark.apache.org