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From Andrey Ilinykh <>
Subject Re: in AWS is it worth trying to talk to a server in the same zone as your client?
Date Wed, 12 Feb 2014 18:33:36 GMT
yes, sure. Taking data from the same zone will reduce latency and save you
some money.

On Wed, Feb 12, 2014 at 10:13 AM, Brian Tarbox <>wrote:

> We're running a C* cluster with 6 servers spread across the four us-east1
> zones.
> We also spread our clients (hundreds of them) across the four zones.
> Currently we give our clients a connection string listing all six servers
> and let C* do its thing.
> This is all working just fine...and we're paying a fair bit in AWS
> transfer costs.  There is a suspicion that this transfer cost is driven by
> us passing data around between our C* servers and clients.
> Would there be any value to trying to get a client to talk to one of the
> C* servers in its own zone?
> I understand (at least partially!) about coordinator nodes and replication
> and know that no matter which server is the coordinator for an operation
> replication may cause bits to get transferred to/from servers in other
> zones.  Having said there a chance that trying to encourage a
> client to initially contact a server in its own zone would help?
> Thank you,
> Brian Tarbox

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