MQTT2EdgePeer: A robust and scalable brokerless peer-to-peer edge middleware for topic-based publish/subscribe

The topic-based publish-subscribe paradigm plays an important role among many applications, as it enables a seamless interconnection of heterogeneous client applications and devices, through easy-to-use high-level abstractions. While publish-subscribe systems are usually provided in a centralized (i.e., broker-based) model, a peer-to-peer (P2P) topology can bring several benefits, such as increased resiliency and scalability, better load distribution, and a better handling of hot topics that comprise a large amount of publishers and subscribers. The presence of hot topics can result in high outgoing bandwidth usage, which is an important consideration in edge-based deployments.This paper presents MQTT2EdgePeer, a robust and scalable P2P brokerless topic-based publish-subscribe middleware that provides compatibility with MQTT-based applications. MQTT2EdgePeer, which is built on top of a structured edge P2P overlay, provides two message delivery approaches that enable a trade-off between efficient bandwidth distribution among the nodes, and latency minimization. Our findings reveal that MQTT2EdgePeer provides improved scalability, better load distribution, and reduced latencies, in comparison with a state-of-the-art Distributed Single Root per Topic (DSRT) approach.

Recommended citation: Rahmani, S., Ali-Pour, A., Coti, C. and Gascon-Samson, J., 2024, May. MQTT2EdgePeer: A robust and scalable brokerless peer-to-peer edge middleware for topic-based publish/subscribe. In 2024 IEEE 24th International Symposium on Cluster, Cloud and Internet Computing (CCGrid) (pp. 419-424). IEEE.
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