Following is my simple code. When I run it in Spark Local mode it runs perfectly. But when I Try to run it in cluster mode with 1 driver and 1 worker it gives me following exception.
I have tried setJars which is mentioned in some answers but it hasn't helped me.
public static void main(String[] args) throws IOException {
SparkConf conf = new SparkConf().setAppName("example.ClusterPractice").setMaster("spark://192.168.42.18:7077");
conf.setJars(new String[]{"E:\\Eclipses\\neon new projects\\eclipse\\neon new projects\\spark-practice\\out\\artifacts\\spark_practice_jar\\spark-practice.jar"});
JavaSparkContext sc = new JavaSparkContext(conf);
JavaRDD<Integer> numbers = sc.parallelize(Arrays.asList(1, 2, 3));
System.out.println("Reduce");
long total = numbers.reduce((n1,n2)-> n1+n2);
System.out.println(total);
}
Exception I am getting is as follows :
Driver stacktrace: at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1602) at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1590) at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1589) at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59) at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48) at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1589) at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:831) at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:831) at scala.Option.foreach(Option.scala:257) at org.apache.spark.scheduler.DAGScheduler.handleTaskSetFailed(DAGScheduler.scala:831) at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.doOnReceive(DAGScheduler.scala:1823) at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1772) at org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1761) at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48) at org.apache.spark.scheduler.DAGScheduler.runJob(DAGScheduler.scala:642) at org.apache.spark.SparkContext.runJob(SparkContext.scala:2034) at org.apache.spark.SparkContext.runJob(SparkContext.scala:2131) at org.apache.spark.rdd.RDD$$anonfun$reduce$1.apply(RDD.scala:1029) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151) at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:112) at org.apache.spark.rdd.RDD.withScope(RDD.scala:363) at org.apache.spark.rdd.RDD.reduce(RDD.scala:1011) at org.apache.spark.api.java.JavaRDDLike$class.reduce(JavaRDDLike.scala:385) at org.apache.spark.api.java.AbstractJavaRDDLike.reduce(JavaRDDLike.scala:45) at example.ClusterPractice.main(ClusterPractice.java:22) Caused by: java.lang.ClassCastException: cannot assign instance of java.lang.invoke.SerializedLambda to field org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction2$1.fun$2 of type org.apache.spark.api.java.function.Function2 in instance of org.apache.spark.api.java.JavaPairRDD$$anonfun$toScalaFunction2$1 at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2133) at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1305) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2251) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2169) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2027) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2245) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2169) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2027) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2245) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2169) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2027) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2245) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2169) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2027) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422) at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:75) at org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:114) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:80) at org.apache.spark.scheduler.Task.run(Task.scala:109) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:345) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748)
