A Design And Optimization Of Hybrid P2p Network Model

Peer-to-Peer network technology currently is a hotspot in the international computer network researching field. The main purpose is to fully utilize the potential resources of internet, which includes computing resources, storage resources and file resources, etc. The study of P2P routing network model is always an important component in the research of P2P network. How to route efficiently in P2P network is the key to improve network scalability and resolve the network bandwidth consuming problem. Whether these problems can be solved will directly affect the efficiency of P2P applications and the further development of P2P technology.The work of this thesis is parts of a project named "the research of new network architecture (Peer-to-Peer network technology)", which is supported by the National High Technology Development 863 Program of China. By analyzing the working mechanism and key techniques of P2P routing models, this thesis proposes a new kind of structured P2P routing network model- Hybrid Model based P2P Network. The primary work and contributions of this thesis include: The concepts of Edge Node and method of Sub-network are proposed in this thesis. Nodes in network are put into different sub-network according to network Proximity. And sub-network has various characters due to different nodes in it. The edge nodes are voted from nodes in sub-network compose backbone network. HMPN more suit to physical network topology. By taking advantage of nodes' network Proximity character, HMPN overcomes the detouring problem existing popularly in structured P2P systems and improve efficiency of systems. And it not only The concept of Context is introduced in new Algorithm of KEY matching. The algorithm makes shared files of similar or same averagely spread around all nodes. HMPN keeps Scalability of route network model and achieves better quality of service and transparency of sub-network than structured network model. Synthesis Route Maintenance is designed for updating route of HMPN in the thesis. The route maintenance of Event Trigger mechanism is used in backbone network and Period Trigger mechanism is in sub-network according to different character of nodes and networks. It reduce payload of HMPN and enhance efficiency and quality of system. There is a Manager node in the HMPN. The manager node plays a key role in the many processes of HMPN. And it will provide the foundation for better Manager System of HMPN in future. A series of optimizing mechanisms, which include data item replication and ringpreserving mechanisms, are proposed to keep the stability of hash ring and to improve the routing performance of HMPN by taking advantage of network locality character. ? The routing performance of HMPN is analyzed and validated by making network simulating experiments. The experiments' results indicate that the general routing performance of HMPN is enhanced composed to one of the mainstream structured P2P routing models - Chord.