Study On Searching Technology In Hybrid P2P Network

Resource searching and resource delivery are two crucial problems need to be solved in P2P system. The nature of distributed storage of P2P makes it easier to implement a scalable system for resource delivery. The key problem is how to locate the peer who has the resource. From the trend of P2P development, we can find the rapid increase of a huge new user population and the obvious differences between peers in capability and operating environment. According to this trend, different devices should play different roles in P2P architecture according to their performances. Hybrid P2P network follows this trend, so study on searching technology in hybrid P2P network is of great significance.This thesis does research on many P2P Algorithms, and on this basis, mainly study on searching technology in hybrid P2P network. This thesis does find some problems in hybrid P2P network, such as load balance, single point of failure, request forward between Super-peers. Load balance problem is that many Client-peer publish their indexes to the same Super-peer; the problem of single point of failure and the problem of request forward between Super-peers are caused by instability of P2P network.In order to solve these problems, the thesis introduces Distributed Hash Table, redundancy mechanism, limited walk mechanism, index adjust mechanism into query among Super-peers. Distributed Hash Table using the hash function, publish the index to different Super-peers to solve the problem of load balance; redundancy mechanism publish redundant indexes to much more Super-peers to solve the problem of single point of failure; limited walk mechanism can control the depth of request forward and index adjust mechanism can adjust the storage location of index. Both mechanisms can solve the problem of request forward. Besides, this thesis study on SUN's P2P programming platform, JXTA, implements a P2P search model based on JXTA. .The result of experiment indicate that the method this thesis putting forward, solves problems in searching technology in hybrid P2P network effectively.