Question

请帮助运行Scalding教程。我在单个节点上运行Hadoop 2.2并尝试运行Scalding教程： https://github.com/Cascading/scalding-tutorial/ 在用这些命令成功地建立'胖罐'之后：

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

我尝试使用此命令建议运行教程示例：

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

--local和--hdfs都失败了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

您正在为主类传递错误的名称，这就是它无法找到它的原因。它应该是Tutorial1，而不仅仅是1。您可以在堆栈跟踪中看到错误：

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

没有名为1的班级。尝试：

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

编辑：使用此命令对我来说效果很好：

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

Scalding教程：java.lang.ClassNotFoundException

1 个答案: