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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