关键词: P2P，副本，覆盖网，冗余，Chord，支配集

Abstract: Replication technique is an effective method for improving the availability of data, enhancing performance in terms of query latency and load balance, while replication also brings significant costs in storage space and traffic. We studied how to decrease the redundant traffic cost for replication in structured P2P overlay by topology optimization. We developed a new Hierarchical Proximity-Aware P2P overlay with dominating set nodes acting as super peers, and designed a corresponding replication technique with multiple hash functions for costless query. Our method can efficiently disseminate replicas across the network, increase query hit ratio, and decrease redundant query messages and storage spaces required. We gave theoretical analysis for performance metrics, and by simulation, we verified the superiority of our method.

Key words: P2P, Replica, Overlay, Redundancy, Chord, Dominating set