If we run 2 or 3 nodes in a cluster with mirrored HA queues, are there any restrictions or special procedures that must be observed to upgrade the qpid version on individual nodes without any service interruption? Can different nodes in the cluster run different versions of qpid or do all the nodes have to be upgraded at the same time (like with RabbitMQ - http://www.rabbitmq.com/clustering.html#upgrading which then requires a federation of clusters to keep the service available)?
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