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From aecc <alessandroa...@gmail.com>
Subject Using Spark Context as an attribute of a class cannot be used
Date Mon, 24 Nov 2014 18:15:26 GMT
Hello guys,

I'm using Spark 1.0.0 and Kryo serialization
In the Spark Shell, when I create a class that contains as an attribute the
SparkContext, in this way:

class AAA(val s: SparkContext) { }
val aaa = new AAA(sc)

and I execute any action using that attribute like:

val myNumber = 5
aaa.s.textFile("FILE").filter(_ == myNumber.toString).count
or
aaa.s.parallelize(1 to 10).filter(_ == myNumber).count

Returns a NonSerializibleException:

org.apache.spark.SparkException: Job aborted due to stage failure: Task not
serializable: java.io.NotSerializableException:
$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$AAA
	at
org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1033)
	at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1017)
	at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1015)
	at
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
	at
org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1015)
	at
org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$submitMissingTasks(DAGScheduler.scala:770)
	at
org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$submitStage(DAGScheduler.scala:713)
	at
org.apache.spark.scheduler.DAGScheduler.handleJobSubmitted(DAGScheduler.scala:697)
	at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor$$anonfun$receive$2.applyOrElse(DAGScheduler.scala:1176)
	at akka.actor.ActorCell.receiveMessage(ActorCell.scala:498)
	at akka.actor.ActorCell.invoke(ActorCell.scala:456)
	at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237)
	at akka.dispatch.Mailbox.run(Mailbox.scala:219)
	at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
	at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
	at
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)


Any thoughts about how to solve this issue and how can I give a workaround
to it? I'm actually developing an Api that will need the usage of this
SparkContext several times in different locations, so I will needed to be
accessible.

Thanks a lot for the cooperation



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