Why Rabbitmq cluster delivers messages to consumers in a Round-Robin fashion

Question

I have 2 Rabbitmq nodes connected as a cluster (no queue replication), and have 4 workers, all are bound to the same queue "myqueue", now, I manually publish messages to that queue (the publisher can be connected to any of rabbit nodes .. doesn't affect the result).

Now, this happens: Each time I publish a message to that queue, I find the messages delivered to the workers/consumers in a Round-Robin fashion, no matter what to which node the consumers or the publisher are connected, I always get the same result.

I have been told that this is the effect of Rabbitmq's "prefetch_count", but I don't understand how is that, or even i don't know if that's the right answer.

score 1 · Accepted Answer · answered Dec 07 '13 at 03:51

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I think rabbitmq is behaving correctly. When workers are listening to queue, rabbitmq delivers message to consumers in round robin fashion.

Ref: http://www.rabbitmq.com/tutorials/tutorial-two-python.html

By default, RabbitMQ will send each message to the next consumer, in sequence. On average every consumer will get the same number of messages. This way of distributing messages is called round-robin. Try this out with three or more workers.

answered Dec 07 '13 at 03:51

Marutha

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Does this has to do with the prefetch_count? – securecurve Dec 07 '13 at 07:52
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I don't think so, prefetch count determines how much messages should consumer consume and done while binding to that queue. – Marutha Dec 08 '13 at 06:14
If same user login from multiple devices then message get only one device.How can be solved it or any idea please? – Rafiq Nov 25 '17 at 19:46

Why Rabbitmq cluster delivers messages to consumers in a Round-Robin fashion

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