Monday, February 9, 2009

multicast -- briefly (tibrv etc

Uses a multicast IP address and UDB rather than TCP.

is not supported in JMS standard.

JMS (but no multicast?) unicast supports durable subscription.

RV is the prime example. Weblogic JMS also supports multicast.

Multicast (and therefore RV) is more efficient in terms of resources and redundant data transfer.

Q: usually not guaranteed to be once-and-only-once?
A: TIBCO offers a transactional augmentation of RV (RVTX) that guarantees a 1-and-only-once delivery; however, this solution essentially converts RV into a hub-and-spoke system. Consequently, very few RV implementations are transactional.

Q: the JMS synchronous receiver (poller) won't work. You must use async like onMessage()?
A: i think every receiver must stand ready. A receiver can't decide when to pull from server.

Q: out-of-sequence is possible in multicast and JMS?
A: both possible

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