I am pretty confident that this is a bug, but it is possible that I have missed 
something. In brief, the the problem is that no node will act as the MasterNode 
if there is more than 1 node in the cluster.

Here's what I have run into: After configuring the nodes to be identical as per 
the documentation, the first node to come up will deploy the queues defined in 
the deploy-hasingleton/jms directory, but as soon as the second node of the 
cluster comes up the original node receives a stop from the BarrierController, 
and un-deploys the queues. The second node does not start up the queues neither 
do subsequent nodes in the cluster. When you stop all of the nodes in the 
cluster except 1, that node (it doesn't matter which) will bring back the 
queues. 

The exact same configuration under 4.0.5 works as expected.

This behavior is easy to replicate, just install 2 virgin copies of Jboss on 
separate nodes. Then bring up the first node with the all configuration 
(run.bat ?c all). Note that is elected the Master

2007-09-24 06:48:09,718 DEBUG [org.jboss.ha.singleton.HASingletonController] 
partitionTopologyChanged, isElectedNewMaster=true, isMasterNode=false, 
viewID=-35945124
2007-09-24 06:48:09,718 DEBUG [org.jboss.ha.singleton.HASingletonController] 
startNewMaster, isMasterNode=false
2007-09-24 06:48:09,718 DEBUG [org.jboss.ha.singleton.HASingletonController] 
startSingleton() : elected for master singleton node
2007-09-24 06:48:09,718 DEBUG [org.jboss.ha.singleton.HASingletonController] 
Calling operation: 
deploy(file:/C:/JBoss/jboss-4.2.1.GA/server/all//deploy-hasingleton), on 
target: 'jboss.system:service=MainDeployer'

? it then created the queues for example

2007-09-24 06:48:10,484 DEBUG [org.jboss.system.ServiceCreator] About to create 
bean: jboss.mq.destination:service=Queue,name=A with code: 
org.jboss.mq.server.jmx.Queue
2007-09-24 06:48:10,499 DEBUG [org.jboss.system.ServiceCreator] Created bean: 
jboss.mq.destination:service=Queue,name=A
2007-09-24 06:48:10,499 DEBUG [org.jboss.system.ServiceController] recording 
that jboss.mq.destination:service=Queue,name=A depends on 
jboss.mq:service=DestinationManager
2007-09-24 06:48:10,499 DEBUG [org.jboss.system.ServiceConfigurator] 
considering DestinationManager with object name 
jboss.mq:service=DestinationManager

? now bring up the second node. The log on the original node records the 
following:

2007-09-24 07:37:55,512 INFO  
[org.jboss.ha.framework.interfaces.HAPartition.lifecycle.DefaultPartition] New 
cluster view for partition DefaultPartition (id: 1, delta: 1) : 
[127.0.0.1:1099, 127.0.0.1:1099]
2007-09-24 07:37:55,527 DEBUG 
[org.jboss.ha.framework.interfaces.HAPartition.DefaultPartition] membership 
changed from 1 to 2

? followed by

2007-09-24 07:37:56,840 DEBUG [org.jboss.system.BarrierController] Saw 'stop' 
handback, stopping barrier
2007-09-24 07:37:56,840 DEBUG [org.jboss.system.ServiceController] stopping 
service: jboss.ha:service=HASingletonDeployer,type=Barrier
2007-09-24 07:37:56,840 DEBUG [org.jboss.system.ServiceController] stopping 
dependent services for: jboss.ha:service=HASingletonDeployer,type=Barrier 
dependent services are: []

? and by

2007-09-24 07:37:56,855 DEBUG [org.jboss.system.ServiceController] stopping 
service: jboss.mq.destination:service=Queue,name=A
2007-09-24 07:37:56,855 DEBUG [org.jboss.system.ServiceController] stopping 
dependent services for: jboss.mq.destination:service=Queue,name=A dependent 
services are: []
2007-09-24 07:37:56,855 DEBUG [org.jboss.mq.server.jmx.Queue.A] Stopping 
jboss.mq.destination:service=Queue,name=A
2007-09-24 07:37:56,855 INFO  [org.jboss.mq.server.jmx.Queue.A] Unbinding JNDI 
name: queue/A
2007-09-24 07:37:56,871 DEBUG [org.jboss.mq.server.JMSDestinationManager] 
Closing destination QUEUE.A
2007-09-24 07:37:56,871 DEBUG [org.jboss.mq.server.jmx.Queue.A] Stopped 
jboss.mq.destination:service=Queue,name=A

--------------------------------------------------------------------------------

I thought that the problem could be related to the 
org.jboss.ha.singleton.HASingletonElectionPolicy feature which was back ported 
from 5.0, 
see: http://jira.jboss.com/jira/browse/JBAS-3636

This attribute shows up under the MBean attributes of 
org.jboss.ha.singleton.HASingletonController from the JMX console, but despite 
showing the attribute as read / write, you can not change the value.  Attempts 
to set the the value in the deploy/deploy-hasingleton-service.xml file result 
in a property editor  exception.

There is some method that I am not aware of that they have used to test this 
functionality out in JBoss' test suit, (for example 
http://www.ohloh.net/projects/480/contributors/26897/commits/6569686)
but I could not figure out how to try it out.

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