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use rabbitmq with haproxy and no ha_queues or use rabbitmq without haproxy and use ha_queues

Hi

I'm a little confused. We have an active/active openstack controller (havana, with rabbitmq 3.x), with an haproxy in front of it.

when we use in nova.conf the rabbit_hosts and rabbit_ha_queues and point them to the individual controllers, we get more problems after a controller reboot than when we use rabbit_host and point it to the haproxy ip.

I would like to know what the best practices are in case of an active/active setup, and why. "Because it works best for you in your case" is not a valid answer because I want to understand what's happing (and why it is not happening)

:)