Decentralized Clustering In Pure P2P Overlay Networks Using Schelling´s Model

Clustering involves arranging a P2P overlay network´s topology so that peers having certain characteristics are grouped together as neighbors. Clustering can be used to organize a P2P overlay network so that requests are routed more efficiently. The peers lack of a global awareness of the overlay network´s topology in a P2P network makes it difficult to develop algorithms for clustering peers. This paper presents two decentralized algorithms for clustering peers. The algorithms are concrete realizations of of an algorithm called the abstract Schelling´s algorithm (based on a model from sociology by Thomas Schelling) that can be used to create a family of self-* topology adaptation algorithms for P2P overlay networks. The proposed clustering algorithms are easy to implement, are not designed for clustering on a specific criteria and do not require separate algorithms to handle the flux of peers on the overlay network. The paper presents simulation results for applying the algorithm on random small-world topologies.