[rabbitmq-discuss] how does clustering improve performance?

[PADIOU Pierre-Marie (MORPHO)]

Hello there,

I have been reading the documentation about clustering in rabbitmq. My goal is to achieve maximum performance, not availability (I am not using any persistence btw).

In a previous post on this mailing list ("some questions about rabbitmq clustering, answered"), Alexis Richardson wrote :

"A message arriving at a given node will be routed to appropriate
queues via AMQP bindings and exchange routing rules.  For queues on
that node, this means 'zero hops', and for queues on other nodes, this
means 'one hop'."

In other words, if you've got a two nodes cluster, and a bunch of clients that randomly connects to one of the nodes, it means that for each message sent from one client to a queue there is an equal chance of having zero or one 'hop'. From the point of view of a rabbit node, the throughput will be exactly the same than with a standalone broker (the output being equally divided between local clients and the other node forming the cluster), *and* the global network traffic will increase by 50%.

Can someone explain what I didn't understand?

Thanks!

Pierre-Marie

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