UDP Multicast relies on constantly throwing out the entire state of your system in order to be reliable, whereas with TCP you only need to throw out changes. This is fine in finance because the state is changing constantly anyway so you might as well just continually throw out the multicast traffic.
Message queuing is a more complicated system, but it allows you to push the bulk of your work out to the distributed network instead of concentrating it on the producer.
Message queuing is a more complicated system, but it allows you to push the bulk of your work out to the distributed network instead of concentrating it on the producer.