Subscriber-only nodes and groups offer a powerful way to build read scaling into your PGD cluster.
The Overview introduces how subscriber-only nodes and groups work in PGD.
Creating a subscriber-only group explains how to create a subscriber-only group and node.
Joining a node to a subscriber-only group explains how to join a node to an existing subscriber-only group which has members.
Optimizing subscriber-only groups provides details on how to configure the PGD subscriber-only optimized topology feature which uses a group leader for more efficient replication.