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Does formatting the HDFS filesystem remove my data?


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?

Aug 18 '13 #1
1 1803
4,677 Expert Mod 4TB
Yes, it will format your file system and overwrite what you have there. HDFS is complicated and cool, but it does act as a 'file system' and will overwrite what data is there.
Sep 3 '13 #2

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