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I am trying to run bin/hadoop namenode -format in Ubuntu 12.10 as a root user. But a "Permission Denied" error occurred. Any suggestions? Thanks in advance!

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Make sure you are entering the correct password. –  Shagun Dec 7 '12 at 10:13
    
you shouldn't run it as root user but as hduser user if you created it within the hadoop group. –  eliasah Jul 4 at 8:20

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