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MapReduce >> mail # user >> formatting hdfs says could not create jvm

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formatting hdfs says could not create jvm
Hi i am following this tutorial for installing hadoop alpha 2.0.2 on ubuntu
12.10 and am sure home variables for java and hadoop are properly


after all the setup when i try to format hdfs it says something like this..

hduser@impala:/usr/local/hadoop$ hdfs -format

i get this error any reason why ..

Unrecognized option: -format
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

does anyone have any idea about it??