执行hadoop-mapreduce-examples-2.2.0.jar时出错

问题描述

作为hadoop的初学者，我开始尝试在Ubuntu中配置单节点hadoop集群。在安装和配置后，我使用hadoop处理了示例部分，它引发了以下错误：
$ b $

  hduser1 @ ubuntu：/ usr / local / hadoop $ hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce- examples-2.2.0.jar pi 2 5 
 java.lang.NoSuchMethodError：org.apache.hadoop.util.ProgramDriver.run （[Ljava / lang / String;）
 at org.apache.hadoop.examples.ExampleDriver.main（ExampleDriver.java:74）
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
 at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57）
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
 at java.lang.reflect.Method。 invoke（Method.java:606）
 at org.apache.hadoop.util.RunJar.main（RunJar.java:156）
  

我已经使用了Java-7-oracle和Ubuntu 12.04，并且在这篇文章之后安装并配置了hadoop：

解决方案

错误消息意味着虽然运行时能够找到类 ProgramDriver ，函数 run（）不存在。

最可能的原因是您运行的是旧版本的Hadoop，它暴露了 ProgramDriver 中的差异接口。大约一年前，这种方法被到 run（ ）被称为 driver（）。

确定您正在运行最新版本的Hadoop。

Being a beginner to hadoop,I started to try out configuring a single node hadoop cluster in ubuntu. After installation and configuration, I worked with the example part with hadoop and it have thrown the following error

hduser1@ubuntu:/usr/local/hadoop$ hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-   examples-2.2.0.jar pi 2 5
java.lang.NoSuchMethodError: org.apache.hadoop.util.ProgramDriver.run([Ljava/lang/String;)I
    at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

I have used Java-7-oracle and Ubuntu 12.04 and followed this post to install and configure hadoop: http://codesfusion.blogspot.in/2013/10/setup-hadoop-2x-220-on-ubuntu.html

解决方案

The error message means that while the runtime was able to find the class ProgramDriver, the function run() is not present.

The most likely reason for this is that you're running an old version of Hadoop that exposed a difference interface in ProgramDriver. About a year ago this method was renamed to run() after being called driver().

The fix for that would be making sure you're running a recent version of Hadoop.

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