hadoop / bin / hadoop没有示例jar [英] hadoop/bin/hadoop doesn't have the example jar

问题描述

我安装了hadoop 2.2.0并尝试运行示例wordcount程序。为此，我首先使用以下方式将数据导入到hdfs中：

  bin / hadoop fs -copyFromLocal / home / prassanna / Desktop / input / input 
  

之后，我试着运行字数jar文件：

  root @ prassanna-Studio-1558：/ usr / local / hadoop＃bin / hadoop jar hadoop * examples * .jar wordcount / input -output 
  

但它显示：不是有效的JAR：/ usr / local / hadoop / hadoop *例子* .jar

我检查了 usr / local / hadoop / bin / hadoop 目录，并且没有hadoop示例jar。

解决方案

Jar 你正在寻找的文件在这个目录中：

  hadoop_root / share / hadoop / mapreduce / hadoop-mapreduce-examples-2.2 .0.jar 
  

并且应该使用如下命令运行：

  $ yarn jar hadoop_root / share / hadoop / mapreduce / hadoop-mapreduce-examples-2.2。 0.jar wordcount / input / output 
  

I installed hadoop 2.2.0 and try to run sample wordcount program. For that, first I imported data in to hdfs using:

bin/hadoop fs -copyFromLocal /home/prassanna/Desktop/input /input

After that, I tried to run word count jar file using:

root@prassanna-Studio-1558:/usr/local/hadoop# bin/hadoop jar hadoop*examples*.jar wordcount /input -output

but it showed: Not a valid JAR: /usr/local/hadoop/hadoop*examples*.jar

I checked in usr/local/hadoop/bin/hadoop directory and there is no hadoop example jar.

解决方案

The Jar file you are looking for is in this directory:

hadoop_root/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar

and should be run with a command like this:

$ yarn jar hadoop_root/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.2.0.jar wordcount /input /output

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