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From Aaron Morton <>
Subject Re: Replicate changes from DC1 to DC2, but not from DC2 to DC1
Date Mon, 21 Feb 2011 19:46:47 GMT
Take a look at the NetworkTopologyStrategy and/or the RackInferringSnitch together they  decide
where to place replicas. It's probably not a great idea to muck around with this stuff though.

How about a hadoop job to pull out the data you want? It would be a full scan but in parallel.


On 22/02/2011, at 3:10 AM, H├ęctor Izquierdo Seliva <> wrote:

> Hi all.
> Is there a way (besides changing the code) to replicate data from a Data
> center 1 to a Data center 2, but not the other way around? I need to
> have a preproduction environment with production data, and ideally with
> only a fraction of the data (for example, by key preffixes). I have
> poked around StorageProxy and I can make writes in DC2 not replicate to
> DC1, and as long as I use DC_QUORUM it stays that way, but it
> looks...dangerous. I could do a full key scan but it would take too
> long.
> Have anybody done something similar?
> Thanks!

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