[rabbitmq-discuss] Entity creation order guarantees with shovel/federation

Mon Mar 5 10:05:58 GMT 2012

Hi Simone.

Both shovel and federation create their entities when the rabbit_shovel 
or rabbit_federation applications start up - which is after the rabbit 
application. So yes, there is a race here. Hmm. This could probably be 
fixed fairly easily, I'll file bugs.

Cheers, Simon

On 05/03/2012 8:01AM, Busoli, Simone wrote:
> Hello, I would like to know if there are any guarantees about the order
> in which entities like exchanges and queues are created when they are
> declared in shovel or federation addins with respect to when the broker
> becomes available for clients to connect.
>
> I had assumed that when the broker would start accepting connections
> then the plugins were already initialized and the entities they declare
> available.
>
> What I experienced instead is that after a broker shutdown some clients
> where a reconnection logic was put in place randomly found the exchanges
> they were trying to bound their queues to to not exist yet, as if it
> depended on when exactly the client tried reconnecting.
>
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