hadoop本地运行的两个案例。官方Grep案例、官方WordCount案例。

1.创建在hadoop-2.7.2文件下面创建一个input文件夹
[hadoop@hadoop101 hadoop-2.7.2]$ mkdir input
2.将Hadoop的xml配置文件复制到input
[hadoop@hadoop101 hadoop-2.7.2]$ cp etc/hadoop/*.xml input
3.执行share目录下的MapReduce程序
[hadoop@hadoop101 hadoop-2.7.2]$ bin/hadoop jar
share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar
grep input output 'dfs[a-z.]+'
4.查看输出结果
[hadoop@hadoop101 hadoop-2.7.2]$ cat output/part-r-00000

[hadoop@hadoop101 hadoop-2.7.2]$ mkdir wcinput

[hadoop@hadoop101 hadoop-2.7.2]$ cd wcinput
[hadoop@hadoop101 hadoop-2.7.2]$ touch wc.input

[hadoop@hadoop101 hadoop-2.7.2]$ vi wc.input

xianglin yuanyun baibaihe
linlin chen lixiaolu
chen chen liuyifei jiangsuying
xiang chenyuanyuan
chenyuangyuan

[hadoop@hadoop101 wcinput]$ cd
/opt/module/hadoop-2.7.2/

hadoop jar
[hadoop@hadoop101 wcinput]$
share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar
wordcount wcinput wcoutput

[hadoop@hadoop101 hadoop-2.7.2]$ cat wcoutput/part-r-00000