[jboss-jira] [JBoss JIRA] Created: (JGRP-416) MergeView processing fails for Multiplexer channel

[Jerry Gauthier (JIRA)]

MergeView processing fails for Multiplexer channel
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                 Key: JGRP-416
                 URL: http://jira.jboss.com/jira/browse/JGRP-416
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.4.1
            Reporter: Jerry Gauthier
         Assigned To: Bela Ban


When I simulate a cluster failure and restart using a Multiplexer channel, the merge process fails in JGroups with an UnsupportedOperationException in Multiplexer.mergeServiceState().  The stack trace is as follows.

ERROR [org.jgroups.mux.Multiplexer] problems handling merge view java.lang.UnsupportedOperationException
at org.jgroups.util.UnmodifiableVector.retainAll(UnmodifiableVector.java:158)
at org.jgroups.mux.Multiplexer.mergeServiceState(Multiplexer.java:867)
at org.jgroups.mux.Multiplexer.handleMergeView(Multiplexer.java:812)
at org.jgroups.mux.Multiplexer.access$200(Multiplexer.java:21)
at org.jgroups.mux.Multiplexer$1.run(Multiplexer.java:287)

I looked at the relevant JGroups code and it appears that JGroups uses a MergeView object that always returns an UnmodifiableVector when MergeView.getMembers() is invoked.  The Multiplexer.mergeServiceState() method invokes MergeView.getMembers() followed by UnmodifiableVector(.retainAll(), causing the exception to occur.

This problem can be replicated by executing DRMTestCase in JBossAS 5.0.  The error occurs in DRMTestCase.isMasterReplica().


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