[rabbitmq-discuss] About RabbitMQ federation plugin

Brian Jing brian.newsgroup at gmail.com
Wed Jan 18 06:11:03 GMT 2012

Hi Simon and Simone,

Thanks very much for your clarification! Now it works for me!

The reason why it didn't work before was that I sent messages inside the
callback on_queue_declared, which didn't get executed when I removed the
queue declaration (thats why I thought declaring the queue on upstream
server was required). What I did to resolve it was to create a random
exclusive queue in order to get the callback invoked.

Thanks again!


On Tue, Jan 17, 2012 at 10:00 PM, Simon MacMullen <simon at rabbitmq.com>wrote:

> On 17/01/12 06:50, Brian Jing wrote:
>> I've played with the federation plugin a little. It seems that in order
>> to send a message to a queue on the downstream server, the same queue
>> has to be declared on the upstream server for federation to work?
> No, that should definitely not be the case.
> The federation plugin is meant to send bindings upstream automatically (so
> that it does not just send all messages upstream -> downstream, but only
> the ones that will be routed once they get downstream).
> When you bind a queue to the downstream exchange with routing key A, you
> should see a similar binding appear between the upstream exchange and the
> intermediate upstream exchange (called something like "federation: name ->
> name {A|B}". Is that happening?
> Cheers, Simon
> --
> Simon MacMullen
> RabbitMQ, VMware
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