Same region, cross zone transfer is $0.01 / GB (see http://aws.amazon.com/ec2/pricing/, Data Transfer section).
On Wed, Feb 12, 2014 at 3:04 PM, Russell Bradberry <[email protected]>wrote: > Cross zone data transfer does not cost any extra money. > > LOCAL_QUORUM = QUORUM if all 6 servers are located in the same logical > datacenter. > > Ensure your clients are connecting to either the local IP or the AWS > hostname that is a CNAME to the local ip from within AWS. If you connect > to the public IP you will get charged for outbound data transfer. > > > > On February 12, 2014 at 2:58:07 PM, Yogi Nerella > ([email protected]<//[email protected]>) > wrote: > > 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 > centers. > > 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 <[email protected]>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 >> <[email protected]>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 that...is there a chance that trying to encourage >>> a client to initially contact a server in its own zone would help? >>> >>> Thank you, >>> >>> Brian Tarbox >>> >>> >> >
