[rabbitmq-discuss] Symmetric federation behavior

Thu Mar 1 14:10:36 GMT 2012

Too bad that I didn't realize this was the case earlier, as this is a real showstopper because of bandwidth consumption.
Any chance, by any means, we can have a fix for this or a feasible workaround?

-----Original Message-----
From: Simon MacMullen [mailto:simon at rabbitmq.com] 
Sent: giovedì 1 marzo 2012 14:55
To: Busoli, Simone
Cc: rabbitmq-discuss at lists.rabbitmq.com
Subject: Re: [rabbitmq-discuss] Symmetric federation behavior

Yeah, I'm afraid that's the case. The existing design puts all the smarts in the downstream; therefore the message can only be thrown away once it's already gone over the gap.

We will revisit this at some point.

Cheers, Simon

On 01/03/12 13:27, Busoli, Simone wrote:
> Hello,
>
> I've set up a symmetric federation between two brokers A and B, that 
> is, an exchange on one broker acts as the upstream for one on the 
> other broker with the same name and vice versa.
>
> To prevent messages from going into an infinite loop I've set max_hops 
> to 1, but I am under the impression that messages published to broker 
> A and then proxied to broker B are somehow proxied back once again to 
> broker A and just then ignored because of the max_hops setting.
>
> Is this behavior expected? Our rationale for using this kind of 
> symmetrically configured federation is twofold: first to prevent 
> messages to go into loops and secondly to conserve bandwidth by 
> preventing messages to roundtrip from A to B and back, and this second 
> aspect doesn't seem to work correctly right now.
>
> Thanks
>
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--
Simon MacMullen
RabbitMQ, VMware

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