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<a href="http://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Re: Clustering and failover question
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created by <a href="http://community.jboss.org/people/gaohoward">Yong Hao Gao</a> in <i>JBoss Messaging</i> - <a href="http://community.jboss.org/message/588604#588604">View the full discussion</a>
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<div class="jive-rendered-content"><p>a) The ClusterPullConnectionFactory is οnly used when a client lookups the ClusteredConnectionFactory.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>--No it's used internally for pulling messages between nodes in a cluster.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>b) That the ClusterPullConnectionFactory only works when one defines the queue as  Clustered=true  (we are doing this in our case)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>--yes, and make sure you deploy the queue on each node.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>c) That the message suckers created by the ClusterConnectionManager only suck messages from the other nodes IF AND ONLY IF the other nodes are up? (they are not in our example).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-;">--Yes, if a node is down, its messages won't be sucked. However they may be 'failover'ed to other nodes.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Our problem is that</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>a) the messages are stored in the DB</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>b) the node that wrote them is taken out</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>c) The messages are readable only if the node that wrote them is up.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I guess this is a 'failover' configuration issue. When a 'node' is taken out, there is always a node in the cluster that will 'merge' the dead node's messages over and deliver them. However if a node is shutdown normally, it may or may not be failed over, depending on a property called 'FailoverOnNodeLeave'.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>By the way, JBoss Messaging is now in maintenance mode, i.e. no more community releases since (only in EAP).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'd suggest you have a look at HornetQ, the successor to JBM and with richer functionalities and better performance. </p></div>
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