Study And Building Three-dimensional Network For P2P Overlay Network

Not only does"Non-centralized network"structure of P2P system bring some advantage that C/S system never owned, but also it brings some problems to system that it has not a fixed topological structure. So, it needs the choice of topology structure,the organization form of data and some solutions of problems to ensure that the network is robustness, expansibility, speediness of locating, supporting complex queries and security network, and effectively exert its advantage. Now, people are still researching and exploring these problems.After summarized of the predecessors' experience, this paper designed a new network model—frustum of a cone model. The model adopted the idea of hierarchical structure of the fourth-generation P2P networks, so this model had obvious hierarchical characteristic. The network scalability problem was solved with the variation of number of layers. DHT principle of the third-generation P2P network was adopted in distribution and management of identifier, so this model allowed identifier to be segmented management and to be distributed. This model adopted different decimal fraction to identify the node in the different level of the network, and solved the problem that the network layers change by changing number of decimal places. This identifier management not only ensured that the level in the network is one-to-one with number of decimal places, but also ensured that the value of identifier is one-to-one with the specific location of the node in the network, so it ensured that the network is fast and efficient locating.In stabilization of the network, according to the "father and son "relationship of the network structure of fluctuation levels, the paper introduced the mechanism of" father or grandfather node playing super node, carrying on the node data and node dynamic management, and also gave a parent's nominate program and ensured a good effect of node as super node, such not only allowed network support complex queries, also ensured that system has robustness. In the aspects of data storage and backup, restoring data in node fault this paper also gave specific solution.Finally, according to the formation of the node properties and reputation into hierarchical shaped distribution characteristics recommended by the father node process, this paper also introduced basic knowledge of the next step research on the trust and security mechanism.