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Cyclic or general overlays may provide multiple paths between publishers andsubscribers. However, an advertisement tree and a matching subscriptionactivates only one path for notifications routing in publish/subscribe systems.This poses serious challenges in handling network conditions like congestion,and link or broker failures. Further, content-based dynamic routing ofnotifications requires instantaneous updates in routing paths, which is not ascalable option. This paper introduces a clustering approach with a bit-vectortechnique for inter-cluster dynamic routing of notifications in a structuredcyclic topology that provides multiple paths between publishers and interestedsubscribers. The advertisement forwarding process exploits the structurednature of the overlay topology to generate advertisement trees of length 1without generating duplicate messages in the advertisement forwarding process.Issued subscriptions are divided into multiple disjoint subgropus, where eachsubscription is broadcast to a cluster, which is a limited part of thestructured cyclic overlay network. We implemented novel static andintra-cluster dynamic routing algorithms in the proposed overlay topology forour advertisement-based publish/subscribe system, called OctopiA. We alsoperformed a pragmatic comparison of our two algorithms with thestate-of-the-art. Experiments on a cluster testbed show that our approachgenerates fewer inter-broker messages, and is scalable.

Adaptive Content-based Routing using Subscription Subgrouping in Structured Overlays