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From Yogi Nerella <>
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 19:57:36 GMT
Also, may be you need to check the read consistency to local_quorum,
otherwise the servers still try to read the data from all other data

I can understand the latency, but I cant understand how it would save
money?   The amount of data transferred from the AWS server to the client
should be same no matter where the client is connected?

On Wed, Feb 12, 2014 at 10:33 AM, Andrey Ilinykh <> wrote:

> 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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