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From Cassa L <>
Subject Re: Multi DC setup
Date Tue, 11 Oct 2011 05:26:43 GMT
We already have two separate rings. Idea of bidirectional sync is, if one
ring is down, we can still send the traffic to other ring. When original
cluster comes back, it will pick up the data from available cluster. I'm not
sure if it makes sense to have separate rings or combine these two rings
into one.

On Mon, Oct 10, 2011 at 10:17 PM, Milind Parikh <>wrote:

> Why have two rings? Cassandra manages the replication for ring
> with physical nodes in two dc might be a better option. Of course, depending
> on the inter-dc failure characteristics, might need to endure split-brain
> for a while.
> /***********************
> sent from my android...please pardon occasional typos as I respond @ the
> speed of thought
> ************************/
> On Oct 10, 2011 10:09 PM, "Cassa L" <> wrote:
> I am trying to understand multi DC setup for cassandra. As I understand, in
> this setup,  replicas exists in same cluster ring, but physically nodes are
> distributed across DCs. Is this correct?
> I have two different cluster rings in two DCs, and want to replicate data
> bidirectionally. They both have same keyspace. They take  data traffic from
> different sources, but we want to make sure, data exists in both the rings.
> What could be the way to achieve this?
> Thanks,
> L.

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