[rabbitmq-discuss] conceptual question

[Ken.Anderson at sungard.com]

Sorry to interject here, but I'm curious as to the answer as well.  I'm assuming the question is related to performance - does the message make on hop between nodes, and then get distributed, or does the exchange on node X send a separate message to all queues on node Y ?


-----Original Message-----
From: rabbitmq-discuss-bounces at lists.rabbitmq.com on behalf of Alexis Richardson
Sent: Fri 7/3/2009 11:06 AM
To: Joel Reymont
Cc: rabbitmq-discuss at lists.rabbitmq.com
Subject: Re: [rabbitmq-discuss] conceptual question
 
Joel

I am not sure if this answers your question but the way RabbitMQ works
is that each consumer gets messages from a queue and each queue is
bound to one node (to which the consumer is connected).  In a cluster
the exchanges' routing tables are replicated across all nodes.  So
when a message arrives a some node in the cluster it will get routed
to any queues that need to see it, whatever node they are on.  In
other words each message makes at most one hop between nodes.

You ask:

> Are subscriptions kept per
> node such that a message going out is first sent to individual nodes
> and from there to this node's subscriber list?

I think the answer is therefore: YES.

Please let me know if this does not make sense or if I have not
understood or answered your question.

alexis



On Wed, Jul 1, 2009 at 3:52 PM, Joel Reymont<joelr1 at gmail.com> wrote:
> Assume that I have a cluster of RabbitMQ nodes and hundreds of
> thousands of subscribers connected to them. Are subscriptions kept per
> node such that a message going out is first sent to individual nodes
> and from there to this node's subscriber list?
>
> My ideal would be for each node to handle delivery to its portion of
> the subscriber list but I don't know if that's how RabbitMQ works.
>
>        Thanks, Joel
>
> ---
> Mac hacker with a performance bent
> http://www.linkedin.com/in/joelreymont
>
>
> _______________________________________________
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>

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