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