On Wed, May 6, 2009 at 11:40 AM, Foss User <foss...@gmail.com> wrote:

> Today I formatted the namenode while the namenode and jobtracker was
> up. I found that I was still able to browse the file system using the
> command: bin/hadoop dfs -lsr /
>
> Then, I stopped the namenode and jobtracker and did a format again. I
> started the namenode and jobtracker. I could still browse the file
> system. Is this an expected behavior or a problem?
>
> I was formatting using the command: bin/hadoop namenode -format
>
> I was running this command on the namenode machine.
>

Were you running the format command as the same user that runs the namenode?
With a default configuration, the dfs.name.dir has the user name included in
it, so running that command as your user account won't affect the cluster if
the cluster namenode is running as a "hadoop" account, for example.

-Todd

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