RabbitMQ fan out on a topic exchange?

Yes, by having the listeners bind using different queue names, they will be treated in a fanout fashion.

Yes, by having the listeners bind using different queue names, they will be treated in a fanout fashion. Fanout is 1:N though, i.e. Each task can be delivered to multiple listeners like pub-sub.

Note that this isn't restricted to a fanout exchange, but also applies if you bind multiple queues to a direct or topic exchange with the same binding key. (Installing the management plugin and looking at the exchanges there may be useful to visualize the bindings in effect. ) Your current setup is a task queue.

Each task/message is delivered to exactly one worker/listener. Throw more listeners at the same queue name, and they will process the tasks round-robin as you say. With "fanout" (separate queues for a topic) you will process a task multiple times.

Depending on your platform there may be existing work queue solutions that meet your requirements, such as Resque or DelayedJob for Ruby, Celery for Python or perhaps Octobot or Akka for the JVM.

I don't know for a fact, but I strongly suspect that RabbitMQ will skip consumers with unacknowledged messages, so it should never bottleneck on a single stuck consumer. The comments on their FAQ seem to suggest that RabbitMQ will make an effort to keep things chugging along even in the presence of troublesome consumers.

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