Leader-follower replication.
also: single-leader replication · primary-replica replication · leader-follower · primary-replica · master-slave replication · read replica · read replicasOne leader takes all writes and streams changes to followers (replicas); reads can go to the leader or any follower.
the two-minute refresher
- Writes go to the leader; followers replay its change stream.
- Read replicas scale reads and keep copies for failover.
- Asynchronous followers lag: a read may miss a just-made write.
- The leader is the write bottleneck and must be replaced on failure (failover).