Comment 10 for bug 1178375

Reviewed: https://review.openstack.org/32187
Committed: http://github.com/openstack/oslo-incubator/commit/76972e2949634abe9fcc9ad36c103cca94300237
Submitter: Jenkins
Branch: master

commit 76972e2949634abe9fcc9ad36c103cca94300237
Author: Russell Bryant <email address hidden>
Date: Wed Aug 28 12:09:54 2013 -0400

    Support a new qpid topology

    There has been a bug open for a while pointing out that the way we
    create direct exchanges with qpid results in leaking exchanges since
    qpid doesn't support auto-deleting exchanges. This was somewhat
    mitigated by change to use a single reply queue. This meant we created
    far fewer direct exchanges, but the problem persists anyway.

    A Qpid expert, William Henry, originally proposed a change to address
    this issue. Unfortunately, it wasn't backwards compatible with existing
    installations. This patch takes the same approach, but makes it
    optional and off by default. This will allow a migration period.

    As a really nice side effect, the Qpid experts have told us that this
    change will also allow us to use Qpid broker federation to provide HA.

    DocImpact
    Closes-bug: #1178375
    Co-authored-by: William Henry <email address hidden>
    Change-Id: I09b8317c0d8a298237beeb3105f2b90cb13933d8