The Research Of DHT Resources Locating Model Based On Hierarchy

It has been broadly accepted that it is possible and urgent to utilize the information efficiently by fast developing network technology. As a novel research field, P2P technology has wide prospect for application. However, the current P2P application systems have not fully demonstrated their capabilities. DHT has high reliability and scalability, and can support abundant application. Whereas, present application of DHT is not as broad as expected. The fundamental issue of P2P technology is to combine various massive, highly dynamic and highly heterogeneous computation nodes, and to provide highly scalable, more efficient and highly capable mutual service.This thesis deeply studies the problems mentioned above, and presents a hierarchical DHT locating model based on Kademlia. This model consists of resources-provide-layer, super-node-layer and register-server-layer. Resources-provide-layer and super-node-layer both use Kademlia to locate resources. The super-node-layer consists of super-nodes which are evaluated and designated by register server according to their capabilities. The resources-provide-layer is constituted of ordinary -nodes, which will dorm different domains. Ordinary-nodes can only locate resources in their own domain. When an ordinary-node fails to locate resources in its domain, it can be helped by the super-node to lookup resources in super-node-layer. Analysis and experimental results show that this model can employ the time-space-locality of queries and data, to realize rapid resources location and efficient data transmission.