It's worth noting that exactly-once delivery is impossible: http://bravenewgeek.com/you-cannot-have-exactly-once-delivery/ http://bravenewgeek.com/you-cannot-ha

It's worth noting that exactly-once delivery is impossible: http://bravenewgeek.com/you-cannot-have-exactly-once-delivery/ http://bravenewgeek.com/you-cannot-have-exactly-once-deliver...