tripleo-heat-templates/releasenotes/notes/rabbitmq-nr-mirrorqueues-7d...

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We now set the default number of rabbitmq queues to CEIL(N/2). (Where N is
the number of rabbitmq nodes). Previously this was set to N by default
which translated to having all queues mirrored to all controllers. By
changing the default to CEIL(N/2) the queues will not be copied around all
servers, but just to a subset of them. This still provides the necessary
resilience in case of a controller crash, but is less demanding in terms of
performance (and likely triggers fewer bugs in rabbit)