WRT the zero consumer queues, in the past I've just had a cron job that checks 
for this and deletes queues that have messages no consumers.

> On Dec 4, 2014, at 12:23 PM, Fischer, Matt <[email protected]> 
> wrote:
> 
> What RabbitMQ optimizations are people making with respect to OpenStack? 
> We’ve started looking into how we can optimize our rabbit cluster to make it 
> more robust and less resource intensive. One thing that seems to happen is 
> that the number of messages we have slowly grows over time because we have 
> messages not being consumed. We’re going to try two things to remedy this and 
> I’d like to get feedback on them:
> The first thing we’d like to do is set a TTL on the OpenStack related queues. 
> We’ve tossed around some numbers like a 60 minute TTL or even a 5 minute one. 
> Has anyone tried this? We’d like to get a good estimate as to a time past 
> which the operation has likely failed anyway or the client is no longer 
> listening. (For example if the VM spins up 60 minutes after it was requested, 
> your client has likely given up and tried it again).
> Another reason we can get messages is that we sometimes have queues with no 
> consumers. These tend to be auto-delete reply queues. We’re planning on at 
> least monitoring these and then trying to figure out why they’re happening. 
> Has anyone else seen these and have advice or a solution?
> Finally we’re looking into is ensuring queues are synced before we a node 
> rejoins the rabbit cluster. We’ve found that at least some of the queues some 
> of the time do not synchronize. We’re not using auto sync due to the number 
> of queues. What’s the community opinion on this?
> 
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