Research Of A P2P System Model Based On Hybrid Network Topology

The current research on structured peer-to-peer P2P with chord protocol is one of the most important problems in distributed-system and computer network field. But when the general P2P system constructs its network, it doesn't consider physical network's topology and heterogeneity of network nodes capability, thus, it induces tremendous network delay in the course of routing . It has been a hot topic how to make P2P work more efficiently as well as make full use of the physical network topology and supernode high handing ability to decrease the delay caused by routing. In this paper we advance a system model, which is called SHP2P. The construction of the Chord system model makes good use of physical network's topological structure. We utilize the idea of supernode in the course of node performance difference. SHP2P is a two-layer hybrid hierarchical P2P system model, which is based on Chord distributed hash table. It is organized by a lot of clusters and has very good self-organization and fault-tolerance.. In this paper we introduce the architecture,the process of routing,the joining and exiting of nodes and updating of algorithms. In the last, we make network simulation on the Chord and SHP2P system models. The result of experiments verifies the SHP2P, compared with Chord, has obvious improvement on the delay of route and the hops of overlay networks.