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An Improved Model of the Centralized P2P

Author: OuYangXiaoXu
Tutor: YeJiHua
School: Jiangxi Normal University
Course: Computer Science and Technology
Keywords: P2P networks Centralized P2P network PPG model Overlay
CLC: TP393.02
Type: Master's thesis
Year: 2011
Downloads: 10
Quote: 0
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Abstract


The P2P is an popular technology nowadays。It is also a hot network model in the areas of computer. P2P has the advantage of high-efficient search ability and well expansibility,it has effectively sloved the problem of single point of failure in the model of B/S and C/S.The technology of P2P can fully use the network resources of the edge nodes such as edge nodes, bandwidth resources and etc,it has greatly reduced the consumption of the center server.So the application that based on the P2P has developed fastly,and has been widely used in the area of file share,IM and Collaborative Computing.The most widely used and common P2P network in the Internet is the centralized P2P network. It sets its center directory server based on the center server,use the center server to protect the address information of the user nodes and the shared file resources information on they,in the centerlized P2P network,the resources is stored on the nodes dispersedly and the real data transmission is among the peer to peer nodes.The effect of center server is to provide publish and query informations service of the nodes in the P2P network.The centerlized P2P network can provide the management service of resource index query ,the users’information,the resource informations and the peer to peer communication between the users.So,the users in the P2P network has a feature of high efficiency and accuracy rate.The P2P network has some disadvantages:the collapse of the center server may lead to the plasy of the whole network and security;with the increased scale of the network,the maintain and update charge of the center directory server may added rapidly.This paper mainly studied the shortcomeings of the centerlized query that the peer send to the center directory server,which lead to the high loading of the center server and the peers excessively depended on the center server.This paper proposed an concerpt of PPG(Peer Private Group) to improve the center directory P2P network mode.In the PPG concerpt,each peer has an only one PPG,it is the initial stack created by the system,the PPG is mainly used to store peer informations and resource informations,which can be shared by the other peers,so that wen can solve the problem that the heavy load and excessively relay of the center server.We use the PeerSim simulation platform to Design Simulation experiment,it mainly compared the PPG model with the The traditional model of centralized P2P from two Feature Enhancements,the experiment show that the PPG model greatly reduced the overload of the Central directory server and Weaken the Dependence of the Peer compared to the The traditional model of centralized P2P.

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