Home
Database internals
Information about the DataStax Distribution of Apache Cassandra 3.11 database.
Data consistency
Topics about how up-to-date and synchronized a row of data is on all replicas.
Write requests
The write consistency level determines how many replica nodes must respond with a success acknowledgment in order for the write to be considered successful
Multiple datacenter write requests
How write requests work when using multiple datacenters.

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.