[rabbitmq-discuss] Controlling upstream federation queue names
simon at rabbitmq.com
Fri Sep 21 11:11:33 BST 2012
On 21/09/12 09:01, Brendan Hay wrote:
> Say I have two downstream brokers connected to a single upstream,
> upon which lives a single exchange.
> Can I configure the plugin, to create the upstream federation queues,
> with the same name so that they round-robin over messages coming
> off the upstream exchange, to ensure messages are delivered to
> _either_ of the downstream pair (rather than both)?
You could set the 'local_nodename' for each broker to the same value.
They will both identify themselves the same way to the upstream, and
thus share queues.
But they won't be aware of each other, and they will thus stomp on each
other's bindings upstream. So that's not good.
Maybe we need to separate the federation from the round-robinning? You
could use the consistent hash exchange upstream as a source, and then
bind two exchanges as local destinations to that, and then federate with
those two exchanges. You won't share the upstream queues but you'll get
a similar round-robinning effect (the difference being that if one link
goes down messages will back up for it, rather than the other link
taking the strain).
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