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Hadoop, mail # user - Backup and upgrade practices?

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Backup and upgrade practices?
Mark Kerzner 2011-06-22, 13:20

I am planning a small Hadoop cluster, but looking ahead, are there cheaps
option to have a back up of the data? If I later want to upgrade the
hardware, do I make a complete copy, or do I upgrade one node at a time?

Thank you,