Any implications of using UUIDs in MQTT topic names?

Question

I am doing a request/response flow using a MQTT broker and I wondered if brokers like VerneMQ or Mosquitto deal well with huge amount of topics. Basically every time I want to do a request/response, I publish to a topic that looks like rpc/{UUID} meaning every request creates a new topic and then unsubscribe from it when the response is received. Will this come and bite me later ?

Answer 1

Topics are effectively ephemeral already.

Usually the only overhead to a topic is in the list of subscribed topic patterns (because they can be wildcards) held for each client. The topic is read from an incoming messages and checked against this list.

Using UUIDs in topics should not cause any problems.