Research On P2P System Model Based On Physical Network Topology

The current research on peer-to-peer P2P 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, thus, it induces tremendous network delay in the course of routing . It has been a hot topic of how to make P2P work more efficiently as well as make full use of the physical network topology to decrease the delay caused by routing. In this paper we advance a system model, which is called EChord on the basis of Chord. The construction of the Chord system model makes good use of physical network's topological structure. We utilize the idea of small world model in the course of designing routing algorithms. EChord is a P2P system model, which is based on a distributed hash table. It has very good self-organization and fault-tolerance. Besides it is simple and strong. 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 EChord system models. The result of experiments verifies the Echord, compared with Chord, has obvious improved on the delay of route and the hops of overlay networks.