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From Jonathan Ellis <>
Subject Re: How is data propagated
Date Thu, 07 Oct 2010 02:26:46 GMT
the former, but also see

On Wed, Oct 6, 2010 at 9:22 PM, MK <> wrote:
> Say I have a cluster of N nodes and I have started all the nodes with
> a replication factor of N. So effectively all data is being mirrored
> everywhere.
> Now, when I write to a node, how does this data get propagated to the
> remaining N-1 nodes.
> 1) Does this one origin node do N-1 network operations to send the data off
> 2) or does the data replication happen in some special distributed
> manner (say origin node writes it to its neigbhors who further write
> it to their neighbors and so on )
> I need to know this because I am thinking about what happens when say
> the link between two datacenters is down.
> Regards,
> MK

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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