I think Open PGM uses IP mulitcast and this is not available in all data centers. For instance inside FB mulicast across racks is disabled for a multitude of reasons. However using TCP should not be a major concern as long as some discipline is in place w.r.t how size of packets are restricted as you scale to several hundreds of nodes. For instance you could cap the packet size at 4K post compression and that will let you scale to perhaps a few thousand nodes.
Or, use OpenPGM (http://code.google.com/p/openpgm/) as an alternative? But
they don't have any Java bindings yet.
ZeroMQ (http://www.zeromq.org/) uses this.
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