[rabbitmq-discuss] Single Queue With Multiple Consumers

[DarthMaul]

I would like to implement a messaging strategy in RabbitMQ that seems
really simple, but I can't figure out how to configure it.
Essentially, I want to have all message producers send messages to a
single queue. Meanwhile, there are any number of message consumers
ready to consume messages off the queue, but each message should be
processed only once.

So lets say you have 1 producer, 20 messages, and 5 consumers. I want
each consumer to be "assigned" one message to start it off, so 15
messages are left. Then as each consumer gets done, he grabs the next
one. And so on.

Essentially, this is what happens at your local bank--one line and
multiple tellers.

Any insight into how to pull this off--or a better approach
altogether--is appreciated.

Thanks.
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[Simone Busoli]

I think you can achieve this by simply using a single queue, having your producer publish directly to it and the consumers consuming from it. Does this make sense?

[Matthias Radestock]

On 16/07/11 09:40, Simone Busoli wrote:
> On Jul 16, 2011 9:30 AM, "DarthMaul" <screec...@gmail.com> wrote:
> > So lets say you have 1 producer, 20 messages, and 5 consumers. I want
> > each consumer to be "assigned" one message to start it off, so 15
> > messages are left. Then as each consumer gets done, he grabs the next
> > one. And so on.
>

> I think you can achieve this by simply using a single queue, having your
> producer publish directly to it and the consumers consuming from it.

You'll also need to set the basic.qos prefetch to 1. See the section on
"Fair dispatch" in
http://www.rabbitmq.com/tutorials/tutorial-two-python.html.

Matthias.

[Barış Velioğlu]

I dont know if the running style of rabbitmq changed over time but it does still fairly dispatch even if the prefectch count is more than 1.