Hybrid Content Distribution Network and Its Performance Modeling

CDN(Content Delivery Network) and P2P(Peer-to-Peer) are two dominant technologies for large-scale content distribution.CDN may reduce the end-user perceived latency,and P2P can decrease the deployment cost.In this paper,HCDN(Hybrid Content Distribution Network) is proposed to combine complementary advantages of CDN and P2P.In which,user node can retrieve content from both backbone CDN system and P2P autonomy.The network model and distribution operations are presented in detail,including content routing and replica placement.Also the performance evaluation based on fluid model is deseribed,and some metrics such as the evolution of nodes,average downloading time,and service capacity are analyzed.The clear performance benefits of the approach are shown with comparison of conventional CDN and P2P.As shown in the experimental results,HCDN has many advantages on decreasing overload of server,increasing downloading speed and reducing network transmission cost.