I suppose that the whole Stateless push is also encouraged by Stateless Session Beans too. I suppose certain problems can be complicated by a need for some kind of common state and can get in the way of parallelism. One example in the system I currently work with is the need to have a limit on the number of messages sent that are of a given category. Sending vast numbers of messages can be scaled in parallel but it gets complicated if the system must guarantee that no more than a given number of messages of that category are sent because then a central count needs to be kept and updated in a synchronized manner.
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