NaiveBayes classifier causes ShuffleDependency class cast exception

aanilpala Thu, 05 Feb 2015 16:41:38 -0800

I have the following code:

        
SparkConf conf = new
SparkConf().setAppName("streamer").setMaster("local[2]");
                conf.set("spark.driver.allowMultipleContexts", "true");
            JavaStreamingContext ssc = new JavaStreamingContext(conf, new
Duration(batch_interval));
                ssc.checkpoint("/tmp/spark/checkpoint");


                SparkConf conf2 = new
SparkConf().setAppName("classifier").setMaster("local[1]");
                conf2.set("spark.driver.allowMultipleContexts", "true");
                JavaSparkContext sc = new JavaSparkContext(conf);

        JavaReceiverInputDStream<String> stream =
ssc.socketTextStream("localhost", 9999);
            
            // String to Tuple3 Conversion
            JavaDStream<Tuple3&lt;Long, String, String>> tuple_stream =
stream.map(new Function<String, Tuple3&lt;Long, String, String>>() {
         ... });
            
            JavaPairDStream<Integer, DictionaryEntry> raw_dictionary_stream =
tuple_stream.filter(new Function<Tuple3&lt;Long, String,String>, Boolean>()
{

                        @Override
                        public Boolean call(Tuple3<Long, String,String> tuple) 
throws Exception {
                                if((tuple._1()/Time.scaling_factor % 
training_interval) > training_dur)
NaiveBayes.train(sc.parallelize(training_set).rdd());
                                
                                return true;
                        }
                
                
                }).

I am working on a text mining project and I want to use NaiveBayesClassifier
of MLlib to classify some stream items. So, I have two Spark contexts one of
which is a streaming context. The call to NaiveBayes.train causes the
following exception.

Any ideas? 

   
 Exception in thread "main" org.apache.spark.SparkException: Job aborted due
to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure:
Lost task 0.0 in stage 0.0 (TID 0, localhost): java.lang.ClassCastException:
org.apache.spark.SparkContext$$anonfun$runJob$4 cannot be cast to
org.apache.spark.ShuffleDependency 
        at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:60) 
        at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41) 
        at org.apache.spark.scheduler.Task.run(Task.scala:56) 
        at
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:196) 
        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
        at java.lang.Thread.run(Thread.java:745) 

    Driver stacktrace: 
        at
org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1214)
 
        at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1203)
 
        at
org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1202)
 
        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:1202) 
        at
org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:696)
 
        at
org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:696)
 
        at scala.Option.foreach(Option.scala:236) 
        at
org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:696)
 
        at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor$$anonfun$receive$2.applyOrElse(DAGScheduler.scala:1420)
 
        at akka.actor.Actor$class.aroundReceive(Actor.scala:465) 
        at
org.apache.spark.scheduler.DAGSchedulerEventProcessActor.aroundReceive(DAGScheduler.scala:1375)
 
        at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516) 
        at akka.actor.ActorCell.invoke(ActorCell.scala:487) 
        at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238) 
        at akka.dispatch.Mailbox.run(Mailbox.scala:220) 
        at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
 
        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)




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NaiveBayes classifier causes ShuffleDependency class cast exception

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