A replication oriented approach to event based middleware over structured peer to peer networks
Proceedings of the 5th international workshop on Middleware for pervasive and ad-hoc computing: held at the ACM/IFIP/USENIX 8th International Middleware Conference
Stochastic Analysis of Hierarchical Publish/Subscribe Systems
Euro-Par '09 Proceedings of the 15th International Euro-Par Conference on Parallel Processing
Stochastic performance analysis and capacity planning of publish/subscribe systems
Proceedings of the Fourth ACM International Conference on Distributed Event-Based Systems
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A publish/subscribe communication system (PSS) realizes a many-to-many anonymous interaction among its participants. Producers of information (publishers) issue notifications to the PSS. These are delivered by the PSS to all subscribers that declared interest in it. However, this decoupled form of interaction introduces delays between i) the production of a notification and its delivery to subscribers (diffusion delay) and ii) the declaration of interest by a subscriber and its registration in the PSS (subscription/unsubscription delay). Such delayscould lead to notification loss scenarios where an event is not delivered to an intended subscriber even though it was issued when the subscription was active. This paper studies this notification loss phenomenon by presenting a simulation study of a PSS and an analytical model. The latter measures the percentage of notifications guaranteed by a PSS implementation to a subscriber. To our knowledge this is the first paper that addresses such a QoS issue. The model is based on a formal framework of a distributed computation. The framework abstracts the PSS through the two delays, de.ning safety and liveness properties that precisely characterize the semantics of the PSS.