Spark-submit ClassNotFound异常

本文介绍了Spark-submit ClassNotFound异常的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

使用这个简单示例我遇到了ClassNotFound异常的问题：

I'm having problems with a "ClassNotFound" Exception using this simple example:

import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf

import java.net.URLClassLoader

import scala.util.Marshal

class ClassToRoundTrip(val id: Int) extends scala.Serializable {
}

object RoundTripTester {

  def test(id : Int) : ClassToRoundTrip = {

    // Get the current classpath and output. Can we see simpleapp jar?
    val cl = ClassLoader.getSystemClassLoader
    val urls = cl.asInstanceOf[URLClassLoader].getURLs
    urls.foreach(url => println("Executor classpath is:" + url.getFile))

    // Simply instantiating an instance of object and using it works fine.
    val testObj = new ClassToRoundTrip(id)
    println("testObj.id: " + testObj.id)

    val testObjBytes = Marshal.dump(testObj)
    val testObjRoundTrip = Marshal.load[ClassToRoundTrip](testObjBytes)  // <<-- ClassNotFoundException here
    testObjRoundTrip
  }
}

object SimpleApp {
  def main(args: Array[String]) {

    val conf = new SparkConf().setAppName("Simple Application")
    val sc = new SparkContext(conf)

    val cl = ClassLoader.getSystemClassLoader
    val urls = cl.asInstanceOf[URLClassLoader].getURLs
    urls.foreach(url => println("Driver classpath is: " + url.getFile))

    val data = Array(1, 2, 3, 4, 5)
    val distData = sc.parallelize(data)
    distData.foreach(x=> RoundTripTester.test(x))
  }
}

在本地模式下，根据文档提交在第31行生成ClassNotFound例外，其中Clas sToRoundTrip对象被反序列化。奇怪的是，第28行的早期使用是可以的：

In local mode, submitting as per the docs generates a "ClassNotFound" exception on line 31, where the ClassToRoundTrip object is deserialized. Strangely, the earlier use on line 28 is okay:

spark-submit --class "SimpleApp" \
             --master local[4] \
             target/scala-2.10/simpleapp_2.10-1.0.jar

但是，如果我为driver-class-path和-jars添加额外的参数，它在本地工作正常。

However, if I add extra parameters for "driver-class-path", and "-jars", it works fine, on local.

spark-submit --class "SimpleApp" \
             --master local[4] \
             --driver-class-path /home/xxxxxxx/workspace/SimpleApp/target/scala-2.10/simpleapp_2.10-1.0.jar \
             --jars /home/xxxxxxx/workspace/SimpleApp/target/scala-2.10/SimpleApp.jar \
             target/scala-2.10/simpleapp_2.10-1.0.jar

但是，提交给本地开发大师仍会产生同样的问题：

However, submitting to a local dev master, still generates the same issue:

spark-submit --class "SimpleApp" \
             --master spark://localhost.localdomain:7077 \
             --driver-class-path /home/xxxxxxx/workspace/SimpleApp/target/scala-2.10/simpleapp_2.10-1.0.jar \
             --jars /home/xxxxxxx/workspace/SimpleApp/target/scala-2.10/simpleapp_2.10-1.0.jar \
             target/scala-2.10/simpleapp_2.10-1.0.jar

我可以从输出中看到JAR文件是被遗嘱执行人提取。

I can see from the output that the JAR file is being fetched by the executor.

其中一个遗嘱执行人的日志在这里：

Logs for one of the executor's are here:

stdout：

stderr：

我正在使用Spark 1.0.2。 ClassToRoundTrip包含在JAR中。
我宁愿不必在SPARK_CLASSPATH或SparkContext.addJar中硬编码值。任何人都可以帮忙吗？

I'm using Spark 1.0.2. The ClassToRoundTrip is included in the JAR.I would rather not have to hardcode values in SPARK_CLASSPATH or SparkContext.addJar. Can anyone help?

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Spark-submit ClassNotFound异常

问题描述

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