Multiple data center write requests
How write requests work when using multiple data centers.
In multiple data center deployments, Cassandra optimizes write performance by choosing one coordinator node. The coordinator node contacted by the client application forwards the write request to each replica node in each all the data centers.
If using a consistency level of
LOCAL_ONE
or LOCAL_QUORUM
, only the nodes in the same data
center as the coordinator node must respond to the client request in order for the request to
succeed. This way, geographical latency does not impact client request response times.