Can Nodes Be Added to DDS Instances?

A cluster instance consists of a config node, and multiple dds mongos and shard nodes. Additional shard and dds mongos nodes can be added, but the number of config nodes is fixed.

A replica set consists of the primary node, secondary node, and hidden node. By default, the system provides a three-node replica set. You can add nodes to a five-node or seven-node replica set as required. The newly added nodes are all secondary nodes.