测试HDFS

$ bin/hdfs dfs -mkdir /user
$ bin/hdfs dfs -mkdir /user/<username>
$ bin/hdfs dfs -mkdir input
$ bin/hdfs dfs -put etc/hadoop/*.xml input
$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.0.2.jar grep input output 'dfs[a-z.]+'
$ bin/hdfs dfs -get output output
$ cat output/*