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From Jean-Yves LEBLEU <jleb...@gmail.com>
Subject Re: Data management on a ring
Date Wed, 10 Nov 2010 10:40:25 GMT
Thanks for the anwser.

It was not exactly my point, I would like to know if in a 10 nodes rings if
it is possible to restrict replication of some data to only 2 nodes, and
other data to all nodes ?
Regards.
Jean-Yves

On Wed, Nov 10, 2010 at 11:17 AM, aaron morton <aaron@thelastpickle.com>wrote:

> If I understand your correctly, you just want to add 8 nodes to a ring that
> already has 2 ?
>
> You could add the nodes and manually assign them tokens following the
> guidelines here http://wiki.apache.org/cassandra/Operations
>
> I'm not sure how to ensure the minimum amount of data transfer though.
> Adding all 8 at once is probably a bad idea.
>
> How about you make a new cluster of 8 nodes, manually assign tokens and
> then copy the data from the 2 node ring to the 8 node. Then move the 2
> original nodes into the new cluster?
>
> Hope that helps.
> Aaron
>
> On 10 Nov 2010, at 20:56, Jean-Yves LEBLEU wrote:
>
> > Hello all,
> >
> > We have an installation of 10 nodes, and we choose to deploy 5 rings of 2
> nodes.
> >
> > We would like to change to a ring of 10 nodes.
> >
> > Some data have to be replicated on the 10 nodes, some should stay on 2
> nodes. Do you have any idea or documentation pointer in order to have a ring
> of 10 nodes with such data repartition ?
> >
> > Thanks for any answer.
> >
> > Jean-Yves
>
>

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