Multiple datacenter write requests
In multiple datacenter deployments, DataStax Enterprise (DSE) optimizes write performance by choosing one coordinator node. The coordinator node contacted by the client application forwards the write request to one replica in each of the other datacenters, with a special tag to forward the write to the other local replicas.
If the write write consistency levels is
LOCAL_QUORUM, only the nodes in the same datacenter as the coordinator node must respond to the client request for the request to succeed.
LOCAL_QUORUM to reduce geographical latency and lessen the impact on response times of client write requests.