I've been evaluating messaging technologies for my company but I've become very confused by the conceptual differences between a few terms:

Pub/Sub vs Multicast vs Fan Out I am working with the following definitions:

  • Pub/Sub has publishers delivering a separate copy of each message to each subscriber which means that the opportunity to guarantee delivery exists
  • Fan Out has a single queue pushing to all listening clients.
  • Multicast just spams out data and if someone is listening then fine, if not, it doesn't matter. No possibility to guarantee a client definitely gets a message.

Are these definitions right? Or is Pub/Sub the pattern and multicast, direct, fanout etc. ways to acheive the pattern?

I'm trying to work the out-of-the-box RabbitMQ definitions into our architecture but I'm just going around in circles at the moment trying to write the specs for our app.

Please could someone advise me whether I am right?

message-queue messaging rabbitmq publish-subscribe amqp
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