[jboss-user] [JBoss Messaging] - Re: Distributed queue, HA-JMS/singleton basic questions

[kapucin]

I see. 
One question on fault-tolerange to message loss. Do the messages get replicated across the cluster (using post-office pulling or post-office routing?), so in case a node fails, they are not lost OR are they stored in a database until acknowledged?
If it's the database, then I can assume that not persisted messages are lost in case of node failure. 
If it's replication, how does it affect the performance in term of network traffic/resource usage? Are all the messages forwarded/pulled by all the members or only those unread for a # of milliseconds and only a limited number of nodes?




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