Abstract: Duplication technology is one of the common data-management mechanisms in P2P network. As nodes are highly dynamic in the P2P network, duplication management, which is worthy of being studied, is also required to be dynamic. It still remains a difficult problem of how to improve the searching efficiency in unstructured P2P network with the use of duplication technology. This paper probes into the duplication management policy and the Gossip protocol, which is widely used in unstructured P2P network, and proposes a strategy of node choosing to store duplications by using fuzzy theory. We demonstrate the improvements of the strategy on searching efficiency in P2P network through simulation experiments and the analyses of its data.

Key words: Gossip protocol, Fuzzy theory, Unstructured P2P, Resource searching, Duplication technology

摘要： 副本技术是P2P网络中常用的一种数据管理机制，在P2P网络中，由于节点的高度动态性，致使副本管理也必须具有动态性，副本管理是一项极具研究价值的课题。如何利用副本技术来提高非结构化P2P网络的资源搜索效率仍是目前尚未有效解决的难点之一。本文对非结构化P2P网络中广泛应用的Gossip协议和副本管理策略进行了探索和研究，运用模糊理论提出一种副本存储节点的选择策略。通过模拟实验，对相关数据进行的分析，证明该项研究能有效提高对等网络中资源搜索的效率。

关键词: Gossip协议, 模糊理论, 非结构化P2P, 资源搜索, 副本技术