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.

Thanks,

Lior

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