This figure below represents the interface exposed by the registry service:

The default registry implementation is realized as following:

1. A client endpoint realizes a lookup on the registry.
2. If the providerEndpoint is a local endpoint or it is already in cache, the provider endpoint information are transmitted to the client.
3. If it is not stored in the registry, the registry consults these closiest neighbours registries to get provider endpoint information and set them in cache before responding to client.

The example below presents the discovery of an endpoint on a chain topology of nodes. If you want create this kind of topology, consult this How-to.