[rabbitmq-discuss] Symmetric federation behavior

Thu Mar 1 14:31:12 GMT 2012

Slightly better: stick a local fanout exchange in front of both, then 
all your clients only need to consume from the downstream and publish to 
the fanout.

Cheers, Simon

On 01/03/12 14:16, Simon MacMullen wrote:
> The best workaround I can offer is to only use asymmetric federation -
> i.e. have separate upstream and downstream exchanges and consume from
> both in any given broker.
>
> Cheers, Simon
>
> On 01/03/12 14:10, Busoli, Simone wrote:
>> 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
>>
>> _________________________________________________________________________________________________________________
>>
>> Questo messaggio è da intendersi esclusivamente ad uso del
>> destinatario e può contenere informazioni che sono di natura
>> privilegiata, confidenziale
>> o non divulgabile secondo le leggi vigenti. Se il lettore del presente
>> messaggio non è il destinatario designato, o il dipendente/agente
>> responsabile
>> per la consegna del messaggio al destinatario designato, si informa
>> che ogni disseminazione, distribuzione o copiatura di questa
>> comunicazione è
>> strettamente proibita anche ai sensi del decreto legislativo 196/03 .
>> Se avete ricevuto questo messaggio per errore, vi preghiamo di
>> notificarcelo
>> immediatamente a mezzo e-mail di risposta e successivamente di
>> procedere alla cancellazione di questa e-mail e relativi allegati dal
>> vostro sistema.
>> _________________________________________________________________________________________________________________
>>
>> This message is intended only for the use of the addressee and may
>> contain information that is privileged, confidential and exempt from
>> disclosure under applicable law. If the reader of this message is not
>> the intended recipient, or the employee or agent responsible for
>> delivering the
>> message to the intended recipient, you are hereby notified that any
>> dissemination, distribution or copying of this communication is strictly
>> prohibited. If you have received this e-mail in error, please notify
>> us immediately by return e-mail and delete this e-mail and all
>> attachments from
>> your system.
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>>
>>
>
>

-- 
Simon MacMullen
RabbitMQ, VMware