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question about CDH3
    I install CDH3 follow the mannul as attached file,
but when I run the command
"su -s /bin/bash -hdfs -c 'hadoop namenode -format'"
on page 25, it show that "su: invalid option --h",
so I change the comand to
"su -s /bin/bash -hdfs -c'hadoop namenode -format'"
the message is that
"May not run daemons as root.Please specify HADOOP_NAMENODE_USER"
So, is there any wrong in my operation?