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From Dominik Safaric <dominiksafa...@gmail.com>
Subject Spark Streaming - java.lang.ClassNotFoundException Scala anonymous function
Date Wed, 01 Mar 2017 13:19:50 GMT
I've been trying to submit a Spark Streaming application using spark-submit to a cluster of
mine consisting of a master and two worker nodes. The application has been written in Scala,
and build using Maven. Importantly, the Maven build is configured to produce a fat JAR containing
all dependencies. Furthermore, the JAR has been distributed to all of nodes. The streaming
job has been submitted using the following command:

bin/spark-submit --class topology.SimpleProcessingTopology --jars /tmp/spark_streaming-1.0-SNAPSHOT.jar
--master spark://10.0.0.8:7077 --verbose /tmp/spark_streaming-1.0-SNAPSHOT.jar /tmp/streaming-benchmark.properties

where 10.0.0.8 is the IP address of the master node within the VNET. 

However, I keep getting the following exception while starting the streaming application:

Driver stacktrace:
    at org.apache.spark.scheduler.DAGScheduler.org$apache$spark$scheduler$DAGScheduler$$failJobAndIndependentStages(DAGScheduler.scala:1435)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1423)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$abortStage$1.apply(DAGScheduler.scala:1422)
    at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
    at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
    at org.apache.spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:1422)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:802)
    at org.apache.spark.scheduler.DAGScheduler$$anonfun$handleTaskSetFailed$1.apply(DAGScheduler.scala:802)

Caused by: java.lang.ClassNotFoundException: topology.SimpleProcessingTopology$$anonfun$main$1$$anonfun$apply$1
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.spark.serializer.JavaDeserializationStream$$anon$1.resolveClass(JavaSerializer.scala:67)
I've checked the content of the JAR using jar tvf and as you can see in the output below,
it does contain the class in question.

1735 Wed Mar 01 12:29:20 UTC 2017 topology/SimpleProcessingTopology$$anonfun$main$1.class
   702 Wed Mar 01 12:29:20 UTC 2017 topology/SimpleProcessingTopology.class
  2415 Wed Mar 01 12:29:20 UTC 2017 topology/SimpleProcessingTopology$$anonfun$main$1$$anonfun$apply$1$$anonfun$apply$2.class
  2500 Wed Mar 01 12:29:20 UTC 2017 topology/SimpleProcessingTopology$$anonfun$main$1$$anonfun$apply$1.class
  7045 Wed Mar 01 12:29:20 UTC 2017 topology/SimpleProcessingTopology$.class
This exception has been caused due to the anonymous function of the foreachPartition call:

rdd.foreachPartition(partition => {
      val outTopic = props.getString("application.simple.kafka.out.topic")
      val producer = new KafkaProducer[Array[Byte],Array[Byte]](kafkaParams)
      partition.foreach(record => {
        val producerRecord = new ProducerRecord[Array[Byte], Array[Byte]](outTopic, record.key(),
record.value())
        producer.send(producerRecord)
      })
      producer.close()
    })
Unfortunately, I am not able to find the root cause of this since so far. Hence, I would appreciate
if anyone could help me out fixing this issue.


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