[jira] [Created] (SPARK-1923) ClassNotFoundException when running with sbt and Scala 2.10.3

["Patrick Wendell (JIRA)" <ji...@apache.org>]

Patrick Wendell created SPARK-1923:
--------------------------------------

             Summary: ClassNotFoundException when running with sbt and Scala 2.10.3
                 Key: SPARK-1923
                 URL: https://issues.apache.org/jira/browse/SPARK-1923
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
            Reporter: Patrick Wendell
            Assignee: Patrick Wendell


I just wanted to document this for posterity. I had an issue when running a Spark 1.0 app locally with sbt. Upgrading the scalaVersion to 2.10.4 in sbt solved this issue. Somehow scala classes were not being loaded correctly inside of the executors:

Application:
{code}
import org.apache.spark.SparkConf
import org.apache.spark.SparkContext

object Test {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setMaster("local[4]").setAppName("Test")
    val sc = new SparkContext(conf)
    sc.makeRDD(1 to 1000, 10).map(x => Some(x)).count
    sc.stop()
  }
{code}

Exception:
{code}
org.apache.spark.SparkException: Job aborted due to stage failure: Task 0.0:1 failed 1 times, most recent failure: Exception failure in TID 1 on host localhost: java.lang.ClassNotFoundException: scala.None$
        java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        java.security.AccessController.doPrivileged(Native Method)
        java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        java.lang.Class.forName0(Native Method)
        java.lang.Class.forName(Class.java:270)
        org.apache.spark.serializer.JavaDeserializationStream$$anon$1.resolveClass(JavaSerializer.scala:60)
        java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1612)
        java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
{code}




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