There is for sure a bug in the Accumulators code.
More specifically, the following code works well as expected:
def main(args: Array[String]) {
val conf = new SparkConf().setAppName("EL LBP SPARK")
val sc = new SparkContext(conf)
val accum = sc.accumulator(0)
sc.parallelize(Array(1, 2, 3, 4)).foreach(x => accum += x)
sc.stop
}
but the following code (adding just a for loop) gives the weird error :
def run(args: Array[String]) {
val conf = new SparkConf().setAppName("EL LBP SPARK")
val sc = new SparkContext(conf)
val accum = sc.accumulator(0)
for (i <- 1 to 10) {
sc.parallelize(Array(1, 2, 3, 4)).foreach(x => accum += x)
}
sc.stop
}
the error:
Exception in thread "main" org.apache.spark.SparkException: Job aborted due
to stage failure: Task not serializable: java.io.NotSerializableException:
org.apache.spark.SparkContext
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)
Can someone confirm this bug ?
Related to this:
http://apache-spark-user-list.1001560.n3.nabble.com/Accumulators-Task-not-serializable-java-io-NotSerializableException-org-apache-spark-SparkContext-td17262.html
http://apache-spark-user-list.1001560.n3.nabble.com/NullPointerException-when-using-Accumulators-on-cluster-td17261.html
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