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I'm starting to learn Hadoop. If I want to format the HDFS filesystem I need to execute

bin/hadoop namenode -format

Does it mean that it will format my filesystem, losing everything I have there? Or will it just create a kind of big "virtual file" over the local filesystem?

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it'll format the HDFS so that you can use it. No harm will be done to your local filesystem.

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Hi. Where could I find more details? – skan Aug 20 '13 at 11:12
with regard to format - The book Hadoop - the definite guide is a must read! – SNeumann Aug 22 '13 at 8:44

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