Qpid HA cluster does not support failback in an ordered domain.

rgmanager has the notion of an ordered domain, where it will try to start services on the highest priority node in the domain.
(see https://fedorahosted.org/cluster/wiki/FailoverDomains)

The problem arises like this:

• start a 2 node cluster with an ordered domain.
• Create a queue and put and put enough messages on so that catchup takes longer than the time to restart node1
• kill node1, rgmanager relocates qpidd-primary service to node2
• immediately restart node1
• rgmanager wants to relocate the service to node1 so it:
• kills the primary on node2 as first step of relocation
• attempts to restart the primary on node1 which fails
  because it is still in catchup and there is no primary to catch up
  from.
• at this point we get into an infinite loop of failed attempts to
  restart the primary.

The workaround is to set the nofailback option on the domain.

See also: https://bugzilla.redhat.com/show_bug.cgi?id=970657