[jira] [Assigned] (SPARK-10554) Potential NPE with ShutdownHook

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-10554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-10554:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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