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From "Alan Conway (JIRA)" <qpid-...@incubator.apache.org>
Subject [jira] Commented: (QPID-2364) Management updates in timer create inconsistencies in a cluster.
Date Mon, 01 Feb 2010 14:29:51 GMT

    [ https://issues.apache.org/jira/browse/QPID-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828113#action_12828113

Alan Conway commented on QPID-2364:

Refactoring done in  r904656

> Management updates in timer create inconsistencies in a cluster.
> ----------------------------------------------------------------
>                 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
>         Attachments: periodic-timer.patch
> 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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