Comment 1 for bug 1550303

Reviewed: https://review.openstack.org/277948
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=37daf71031b54b53d53d4bca29bc572e13f7f250
Submitter: Jenkins
Branch: master

commit 37daf71031b54b53d53d4bca29bc572e13f7f250
Author: Dmitry Mescheryakov <email address hidden>
Date: Tue Feb 9 19:37:26 2016 +0300

    Disable HA for RPC queues by default

    RPC wihout HA was tested on a big scale and we found that it greatly
    reduces load OpenStack puts on RabbitMQ. Hence it is valuable to
    disable it by default.

    DocImpact

    It should be noted in the release notes that starting from 8.0 queue
    mirroring is disabled by default for RPC queues, but it is still
    enabled for Ceilometer ones.

    Also, the change should be reflected in our reference architecture
    guide. Specifically, there is a sentence here starting with
    "RabbitMQ provides active/active high availability ...", which will
    be incorrect after the given change is merged.

    Users are still provided with means to enable mirroring. Details
    could be found in description of that commit:
    https://review.openstack.org/#/c/249180/

    Closes-Bug: #1550303
    Change-Id: Iffa4173c2e6bb54e411defc7bdc44254669be5fd