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From Allen Wittenauer ...@apache.org>
Subject Re: Changing a Namenode server
Date Wed, 16 Mar 2011 14:30:19 GMT

On Mar 16, 2011, at 7:17 AM, Lior Schachter wrote:

> Hi,
> We have been using hadoop/HDSF for some while and we want to upgrade the
> namenode server to a new (and stronger) machine.
> Can you please advise on the correct way to do this while minimizing system
> downtime  and without losing any data.

	It is pretty much the same procedure as if you had perm. lost the NN hardware, more or less:

1) Build new NN machine
2) Shutdown old NN
3) Copy fsimage and edits to new box
4) Swap IPs/move A record/etc=20
5) Mount backup area
6) Bring up NN
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