Comment 25 for bug 856764

Reviewed: https://review.openstack.org/77276
Committed: https://git.openstack.org/cgit/openstack/oslo.messaging/commit/?id=0400cbf4f83cf8d58076c7e65e08a156ec3508a8
Submitter: Jenkins
Branch: master

commit 0400cbf4f83cf8d58076c7e65e08a156ec3508a8
Author: Chet Burgess <email address hidden>
Date: Fri Feb 28 13:39:09 2014 -0800

    Gracefully handle consumer cancel notifications

    With mirrored queues and clustered rabbit nodes a queue is still
    mastered by a single rabbit node. When the rabbit node dies an
    election occurs amongst the remaining nodes and a new master is
    elected. When a slave is promoted to master it will close all the
    open channels to its consumers but it will not close the
    connections. This is reported to consumers as a consumer cancel
    notification (CCN). Consumers need to re-subscribe to these queues
    when they recieve a CCN.

    kombu 2.1.4+ reports CCNs as channel errors. This patch updates
    the ensure function to be more inline with the upstream kombu
    functionality. We now monitor for channel errors as well as
    connection errors and initiate a reconnect if we detect an error.

    Change-Id: Ie00f67e65250dc983fa45877c14091ad4ae136b4
    Partial-Bug: 856764