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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (QPID-5007) Qpid HA cluster does not support failback in an ordered domain.
Date Mon, 01 Dec 2014 20:27:12 GMT

     [ https://issues.apache.org/jira/browse/QPID-5007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Alan Conway reassigned QPID-5007:

    Assignee:     (was: Alan Conway)

> 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
> 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

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