一种基于分层结构的P2P视频点播系统

In recent years, as the development of P2P video-on-demand technology, the scalability of vod system and the continuous degrees of client's watch experience has become more and more with the key and bottleneck in system development.This dissertation presents a P2P vod system based on a delamination structure.It combines the accuracy and efficiency of the DHT（Distributed Hash Table）with the simple application of the Gossip protocol.The upper nodes of this system offer downloading services to the nodes in the lower layer of the chord annular structure,through which it leads to loading equilibrium.This paper also presents a strategy，it can help nodes find the optimal download resource and finally enhance the playing continuity of the system by adding a small amount of local information to the information exchange process which based on Gossip protocol.The emulation experiments show that the system devised in this dissertation can ensure better performance of vod system and obtaining a playing continuity on the condition that server load is stable.