Hadoop案例

当出现域名解析错误，修改/etc/hosts文件

ifconfig hostname     192.168.10.235 hadoop001

案例一 ： grep

mkdir input
cp etc/hadoop-*.xml input

hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar grep input output 'dfs[a-z.]+' cd output cat part-r-0000

案例一 ： wordcount

mkdir cinput
cd cinput
touch word
        hadoop 
        hadoop liyu
        hadoop mark
        hello mark
hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar wordcount cinput coutput