0-2编译打包wordcount例子

1.编译打包

#创建一个放 class 文件的目录

$ mkdir class

 

#编译 WordCount 源文件

javac -classpath/opt/hadoop-2.2.0/share/hadoop/common/hadoop-common-2.2.0.jar:/opt/hadoop-2.2.0/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.2.0.jar-d class WordCount.java

#将程序打包；

###"."前有空格

$ jar -cvfwordcount.jar -C class .  

2.运行

 准备数据

hadoop fs –mkdir /in

hadoop fs  -put  1.txt  /in

运行

hadoop jar /home/hadoop/wordcount.jar   org.apache.hadoop.examples.WordCount  /in /out

又运行一次

hadoop jar /home/hadoop/wordcount.jar   org.apache.hadoop.examples.WordCount  /in/out1

 

 查看：localhost:8088

点击：History，跳转到localhost:19888