Hello guys, I would like to propose to disable HA for OpenStack RPC queues. The rationale is to reduce load on RabbitMQ by removing necessity for it to replicate messages across the cluster. You can find more details about proposal in spec [1].
To what is in the spec I can add that I've ran a test on scale which confirms that there is at least one case where our messaging stack is bottleneck currently. That is a Rally boot_and_delete_server_with_secgroups run against setup with Neutron VXLAN with DVR. Just removing HA policy reduces the test time 2 times and increases message throughput 2-3 times. I think that is a very clear indication of benefit we can get. I do understand that we are almost in Feature Freeze, so I will request a feature freeze exception for that change in a separate thread with detailed plan. Thanks, Dmitry [1] https://review.openstack.org/#/c/247517/
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