烫伤教程:java.lang.ClassNotFoundException

Question

请帮助运行烫伤教程。我有Hadoop 2.2在单个节点上运行，并试图运行烫伤教程:https://github.com/Cascading/scalding-tutorial/使用以下命令成功构建"fat jar"后:

$ git clone git://github.com/Cascading/scalding-tutorial.git
$ cd scalding-tutorial
$ sbt assembly

我尝试按照建议使用以下命令运行教程示例:

$ yarn jar target/scalding-tutorial-0.8.11.jar <TutorialPart> --local <addtional arguments>

——local和——hdfs都失败，java.lang.ClassNotFoundException:

$ yarn jar target/scala-2.9.3/scalding-assembly-0.10.0.jar 1 --local
Exception in thread "main" java.lang.ClassNotFoundException: 1
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:205)
$ yarn jar target/scala-2.9.3/scalding-assembly-0.10.0.jar 1 --hdfs
Exception in thread "main" java.lang.ClassNotFoundException: 1
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:205)

更新

将命令参数更改为'Tutorial1'， 'Tutorial0'也没有帮助:

$ yarn jar target/scala-2.9.3/scalding-assembly-0.10.0.jar Tutorial1 --local
Exception in thread "main" java.lang.ClassNotFoundException: Tutorial1
 at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:247)
 at org.apache.hadoop.util.RunJar.main(RunJar.java:205)
$ yarn jar target/scala-2.9.3/scalding-assembly-0.10.0.jar Tutorial0 --local
Exception in thread "main" java.lang.ClassNotFoundException: Tutorial0
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.apache.hadoop.util.RunJar.main(RunJar.java:205)

Answer 1

你传递了一个错误的主类名称，这就是为什么它找不到它。应该是Tutorial1，而不是1。您可以在堆栈跟踪中看到错误:

Exception in thread "main" java.lang.ClassNotFoundException: 1

不存在1类。试一试:

$ yarn jar target/scala-2.9.3/scalding-assembly-0.10.0.jar Tutorial1 --local

编辑:这个命令对我来说工作得很好:

$ yarn jar target/scalding-tutorial-0.8.11.jar Tutorial1 --local