Alan Conway created QPID-5007:
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Summary: Qpid HA cluster does not support failback in an ordered
domain.
Key: QPID-5007
URL: https://issues.apache.org/jira/browse/QPID-5007
Project: Qpid
Issue Type: Bug
Components: C++ Clustering
Affects Versions: 0.22
Reporter: Alan Conway
Assignee: Alan Conway
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.
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