Structured P2p Network Resource Discovery Technology Research

P2P (Peer to Peer) network - an kind of logical network built on the application layer, has character of non-centralization, extendibility, toughness, high performance-to-price ratio, load equalization. P2P network owns unexampled superiority over the traditional distributed system. In recent years, P2P technology develops rapidly, and is widly applied in a variety of network services. It has increasingly become a hot issue in research and application. And the resources of P2P network also become richer than before. It is a key issue to locate resources needed effectively in P2P network all the time. The search technology of the structured P2P network resources is the most important one in research due to its high precision and high extendibility.The thesis makes some researches on inquiry technology of the structured P2P network, improves the basic Chord routing algorithm. A bidirectional Chord system based on different peers is put forward in this thesis, and is realized.The content of this thesis mainly includes the following aspects:1. It introduces the basic notions of P2P network in detail, including the definition, character, field of application and classification. On the whole, it gives comparison between the structured P2P network and the unstructured P2P network. Afterward it summaries the progress of the domestic and foreign relate researches.2. It introduces some knowledge related to research technology in the structured P2P network, including DHT routing principle, the influence of degree and diameter to algorithm, the small-world model and so on. A few typical routing protocols are analysed by comparing their character and performance.3. Based on analysis of the basic Chord routing algorithm and some improvement routing algorithms, taking the bidirectional Chord algorithm idea, considering the heterogeneity of peers and the improvement of information redudancy in the routing tables, a bidirectional Chord system based on different peers is put forward in this thesis. It does simulation by using a universal topology generator.4. In the local area network environment, the bidirectional Chord system based on different peers is realized by using JXTA. The thesis discusses its practical application value.