While startng the Hadoop i was just trying to format the filesystem. For that i have executed below command.

bin/hadoop namenode -format

But i am getting below error while doing this. Could you please let me know what could be the reason behind this.

Warning: $HADOOP_HOME is deprecated.

13/08/10 13:52:56 INFO namenode.NameNode: STARTUP_MSG:
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = ubuntu/
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 1.0.4
STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by ‘hortonfo’ on Wed Oct 3 05:13:58 UTC 2012
Re-format filesystem in /app/hadoop/tmp/dfs/name ? (Y or N) y
Format aborted in /app/hadoop/tmp/dfs/name
13/08/10 13:53:00 INFO namenode.NameNode: SHUTDOWN_MSG:
SHUTDOWN_MSG: Shutting down NameNode at ubuntu/



Use CAPS Y instead of y while providing the input. It will solve your problem.

Re-format filesystem in /app/hadoop/tmp/dfs/name ? (Y or N)  Y

Here Y should be used and not y. Don’t know what is the reason behind this problem. But this solved my problem.  If any one knows the reason please let me know.Thanks

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