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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-4428) HA add UUID tag to avoid using an out of date queue.
Date Wed, 07 Nov 2012 21:10:12 GMT
Alan Conway created QPID-4428:
---------------------------------

             Summary: HA add UUID tag to avoid using an out of date queue.
                 Key: QPID-4428
                 URL: https://issues.apache.org/jira/browse/QPID-4428
             Project: Qpid
          Issue Type: Bug
          Components: C++ Clustering
    Affects Versions: 0.19
            Reporter: Alan Conway
            Assignee: Alan Conway


Here's the scenario: we have a cluster with primary A and backups B and C. There is a queue
Q that is replicated to both. Now A dies and B takes over as primary. Before C has connected
to B, a client destroys Q and creates a new queue with the same name, Q. When C does connect
it sees a queue named Q and mistakenly assumes it is the same queue as it's own Q - so it
has an incorrect replica of Q. The same scenario applies to exchanges.

The fix is to tag queues and exchanges with a UUID, so backups can identify that the queue
has changed even if the name is the same.

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