“错误:找不到或加载主类org.apache.hadoop.util.RunJar"是什么意思? [英] What does "Error: Could not find or load main class org.apache.hadoop.util.RunJar"?

问题描述

我正在尝试运行 Hadoop在行动中的书第15页中所指出的示例. 这是需要运行的命令:

I am trying to run an example as it is pointed in Hadoop in Action book page 15. this is the command that needs to be run :

bin/hadoop jar hadoop-*-examples.jar

但我收到此错误

"Error: Could not find or load main class org.apache.hadoop.util.RunJar"

似乎是类路径问题之类的.有人可以指出一些准则吗?

It seems like a classpath issue or something. Can someone point out some guideline ?

实际上，我无法运行任何hadoop命令，例如version，fs，jar ...等.

Actually I am not able to run any of hadoop commands like version, fs, jar ... and so on .. !

注意:我正在使用Windows.

NOTE: I am using windows.

推荐答案

[已编辑] 好的，我的阅读速度太快了，您提到您也无法运行hadoop fs命令.我想您可能会错过一些配置或根本没有启动服务.尝试遵循此教程一步一步来.

Okay, i was reading too fast, you mentioned you were not able to run hadoop fs commands as well. I guess you might miss a few congifurations or haven't start the services at all. Try following this tutorial step by step.

您将需要输入类名，例如:

you will need to pass in the class name, for example:

bin/hadoop jar hadoop-*-examples.jar org.apache.hadoop.examples.WordCount [input] [output]

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