Biased selection for building small-world networks

  • Authors:
  • Andrés Sevilla;Alberto Mozo;M. Araceli Lorenzo;Jose Luis López-Presa;Pilar Manzano;Antonio Fernández Anta

  • Affiliations:
  • Dpto Informática Aplicada, U. Politécnica de Madrid, Madrid, Spain;Dpto Arquitectura y Tecnología de Computadores, U. Politécnica de Madrid, Madrid, Spain;Dpto Arquitectura y Tecnología de Computadores, U. Politécnica de Madrid, Madrid, Spain;DIATEL, U. Politécnica de Madrid, Madrid, Spain;Dpto Informática Aplicada, U. Politécnica de Madrid, Madrid, Spain;Institute IMDEA Networks, Leganés, Spain

  • Venue:
  • OPODIS'10 Proceedings of the 14th international conference on Principles of distributed systems
  • Year:
  • 2010

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Abstract

Small-world networks are currently present in many distributed applications and can be built augmenting a base network with long-range links using a probability distribution. Currently available distributed algorithms to select these long-range neighbors are designed ad hoc for specific probability distributions. In this paper we propose a new algorithm called Biased Selection (BS) that, using a uniform sampling service (that could be implemented with, for instance, a gossip-based protocol), allows to select long-range neighbors with any arbitrary distribution in a distributed way. This algorithm is of iterative nature and has a parameter r that gives its number of iterations. We prove that the obtained sampling distribution converges to the desired distribution as r grows. Additionally, we obtain analytical bounds on the maximum relative error for a given value of this parameter r. Although the BS algorithm is proposed in this paper as a tool to sample nodes in a network, it can be used in any context in which sampling with an arbitrary distribution is required, and only uniform sampling is available. The BS algorithm has been used to choose long-range neighbors in complete and incomplete tori, in order to build Kleinberg's small-world networks. We observe that using a very small number of iterations (1) BS has similar error as a simulation of the Kleinberg's harmonic distribution and (2) the average number of hops with greedy routing is no larger with BS than in a Kleinberg network. Furthermore, we have observed that before converging to the performance of a Kleinberg network, the average number of hops with BS is significantly smaller (up to 14% smaller in a 1000 × 1000 network).