hadoop实践-WordCount

1.新建分词文件

mkdir input
cd input
echo "hello world" >test1.txt 
echo "hello hadoop" > test2.txt

2.上传到HDFS

bin/hadoop dfs -put ../input in 

3.执行hadoop examples中的wordcount jar：

/home/hadoop/hadoop-2.6.0/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0.jar

4.查看jar包源码

5.

genericoptionsparser为configuration对象设置相应的取值，

 

6.用eclipse关联源码

下载hadoop-2.6.0-src，打开eclipse，import maven工程