This page introduces the high availability (HA) of DDS.
Auto Failover
In Replica Set mode, the Primary and Secondary nodes provide services (Hidden nodes are not visible to the service). When the Primary node fails, a new Primary node is automatically elected to take over the service.
In Cluster Specification mode, the Configserver role and each Shard role are composed of a set of three-node replica sets. When the Primary node fails, the system automatically elects a new Primary node.