Comment 6 for bug 1990257

Setting:

[oslo_messaging_rabbit]
kombu_reconnect_delay=0.5

will fix it. From yoga we can use quorum queue to suffer when 1 of 3 node is down.

https://docs.openstack.org/releasenotes/oslo.messaging/yoga.html

If you use SAN then use both of them:

https://docs.openstack.org/releasenotes/oslo.messaging/yoga.html