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From "Alan Conway (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Created: (QPID-2364) Management updates in timer create inconsistencies in a cluster.
Date Tue, 26 Jan 2010 22:16:34 GMT
Management updates in timer create inconsistencies in a cluster.
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                 Key: QPID-2364
                 URL: https://issues.apache.org/jira/browse/QPID-2364
             Project: Qpid
          Issue Type: Bug
          Components: C++ Broker
    Affects Versions: 0.6
            Reporter: Alan Conway
            Assignee: Alan Conway


Management updates are triggered by a timer. They are not predictable for the
cluster and so can cause cluster shut-downs and inconsistent message delivery.

We have a hack in place that suppresses exceptions when the session receives
completions for transfers not yet sent (which is the usual manifestation of the
unpredictability). I.e. we have in essence disabled consistency checking for
management sessions. This solved immediate problems but would quickly stop
working if sessions/connections could be used for management and other things
(as will be more likely with QMFv2 where using management becomes quite
straightforward).    

In a cluster, management updates need to be synchronized by executing them in the cluster
dispatch thread rather than a timer thread.



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