[rabbitmq-discuss] Simultaneous Scalability and HA

Matthias Radestock matthias at rabbitmq.com
Fri Jun 21 11:36:43 BST 2013

On 21/06/13 11:17, Tim Watson wrote:
> Mirroring / HA provides replication of contents for 1 queue, that
> you've chosen to mirror, and *you can maintain the queue's state
> across however many replicas you see fit*

That is the crucial bit.

If you want HA *and* increased scalability then create a cluster with >2 
nodes and configure your HA policy to mirror queues across a subset of them.

The 'exactly' and 'nodes' policies allow you to do that. See 

NB: RabbitMQ in Action predates the introduction of server-configured 
policies; the x-ha-policy queue parameter does nothing in modern 
rabbits. See the above docs for the new way of configuring HA.



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