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Network architectures built completely on publish and subscribe primitives instead of send and receive, have recently attracted many researchers. Pub/sub paradigm changes the networking completely: end-to-end principle breaks, communication channels become unidirectional, and multicast becomes a norm. Although pub/sub has attracted many, the research has been focusing on the network layer - functionalities that lie on the higher layers have not been studied so thoroughly. This paper focuses on how reliability, which is normally addressed above networking layer, can be achieved in pub/sub networks. Reliability and guaranteed message delivery have traditionally been solved at the endpoints of the communication but the approach does not work anymore in pub/sub paradigm.
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