Multiple datacenter write requests
How write requests work when using multiple datacenters.
In multiple datacenter deployments, DataStax Distribution of Apache Cassandra™ (DDAC) 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_ONE
or LOCAL_QUORUM
,
only the nodes in the same datacenter as the coordinator node must respond to the client
request for the request to succeed. Use either LOCAL_ONE
or
LOCAL_QUORUM
to reduce geographical latency and lessen the impact on
response times of client write requests.
