You only need to configure Hazelcast if you are using either of this functionality:
- Timer - and only want the timer to run once within the cluster
- MQTT Listener - only one node to process the message.
Otherwise, Hazelcast is not required.
Starting 5.0, an admin database is no longer required. Each node starts up with a repository (identical) that is bootstrapped and loaded into memory.
If this is still not clear, please log a support ticket requesting to speak with the product team (referencing this community thread). I'd be happy to discuss this with you offline.
Wai-Yin