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From "Alan Conway (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3369) Loss of cluster elder can result in loss of whole cluster
Date Tue, 13 Sep 2011 18:37:09 GMT

    [ https://issues.apache.org/jira/browse/QPID-3369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103883#comment-13103883

Alan Conway commented on QPID-3369:

Do you have a test to reproduce the issue?

> Loss of cluster elder can result in loss of whole cluster
> ---------------------------------------------------------
>                 Key: QPID-3369
>                 URL: https://issues.apache.org/jira/browse/QPID-3369
>             Project: Qpid
>          Issue Type: Bug
>          Components: C++ Clustering
>    Affects Versions: 0.7
>            Reporter: Jason Dillaman
>            Assignee: Alan Conway
>         Attachments: QPID-3369.patch
> If the cluster elder is lost, it is possible that the remaining nodes of the
> cluster will fail with the following errors:
>   Error delivering frames: Cluster timer wakeup non-existent task
> ManagementAgent::periodicProcessing (qpid/cluster/ClusterTimer.cpp:93)
> -- or --
>   Error delivering frames: Cluster timer drop non-existent task
> ManagementAgent::periodicProcessing (qpid/cluster/ClusterTimer.cpp:109)
> When a member is promoted to be the elder, the ClusterTimer::becomeElder()
> method will add all the current cluster tasks to the Timer.  However, there is
> a potential race condition where CPG can deliver the timer wakeup from the
> original elder.

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