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Replication and caching have been deployed widely in current P2P systems. In update-allowed P2P systems, a consistency maintenance mechanism is strongly demanded. Several solutions have been proposed to maintain the consistency of P2P systems. However, they either use too much redundant update messages, or ignore the heterogeneity nature of P2P systems. Moreover, they propagate updated contents on a locality-ignorant structure, which could consume unnecessary backbone bandwidth and delay the convergence of consistency maintenance. This paper presents a locality-aware consistency maintenance scheme for heterogeneous P2P systems. Taking the heterogeneity nature, we form the replica nodes into a locality-aware hierarchical structure: the upper layer is DHT-based and a node in the lower layer attaches to a physically close node in the upper layer. An efficient update tree is built dynamically upon the upper layer to propagate the updated contents. Theoretical analyses and simulation results demonstrate the effectiveness of our scheme. Specially, experiment results show that, compared with gossip-based scheme, our approach reduces the cost by about one order of magnitude.
Date of Conference: 26-30 March 2007