【作者】 叶淮光；

【导师】 黄晓涛；

【作者基本信息】 华中科技大学 ， 计算机应用技术， 2006， 硕士

【摘要】 随着Internet的迅速发展,使用Internet的用户呈现指数级的增长,如何更加有效的利用共享网络资源成为业界关心的热点,P2P技术的产生使处于Internet边缘的用户以一种前所未有的积极姿态参与到资源共享当中来。主要问题将围绕资源共享的问题探讨分布式处理技术。文件共享是资源共享的一种最基本的形式,保证共享文件健康快速的分发是分布式文件共享系统中一个最重要的目标。针对上述目标,在研究了流行的几种文件共享系统之后,提出了一种改进的分布式文件共享系统:文件定制系统,以用户反馈为基础,在分布式环境下通过控制文件Cache,保证共享文件有效快速的分发。文件定制系统的关键技术包括:节点发现和文件查找,文件Cache策略,流量检测和拥塞控制,在作了相关分析和研究以后,给出了解决方案。其中节点发现使用P2P系统中DHT算法实现,文件查找则使用在服务器端全文检索技术实现。同时在地理优先,最稀少优先,节点流量小优先的Cache原则基础上提出了基于流量检测的文件Cache时机的选择以及Cache数量的选择。然后讨论了文件定制系统中的拥塞控制。在探讨了关键技术的基础上,设计了一个分布式环境下的文件定制原形系统FCS,最后提出了系统实现中存在的不足和进一步的改进措施。更多还原

【Abstract】 As the rapid development of Internet, the numbers of the users who use Internet are on the exponential rise. So how to make efficient use of sharing network resources becomes a hotspot. P2P technology who makes users that are located at the edge of Internet take a more active part in the resources sharing. The problem of resources sharing will probe into the distributed computing technology.Files sharing are one of the basic forms of resources sharing. A foremost object in distributed files sharing systems is to ensure the sharing files could be dispensed rapidly and effectively. After researching on several prevalent files sharing system, aiming at above objects, we propose a improved distributed files sharing system, files customization system, under the base of user feedback, by means of controlling file cache to achieve rapid and effective dispensing of sharing files.The key technologies of the files customization system include discovering nodes, looking up files, files cache strategy, checking flux, and controlling congestion. After doing correlative analysis and research, a solution is presented. DHT arithmetic in P2P location and route technologies is used to achieve discovering nodes, while full text retrieval technology on servers is used to achieve looking up files. Propose a flux check based files Cache opportunity choosing method and Cache quantity choosing method based on Cache principle which is geographical first, the most infrequent first and the least flux first. Then discuss the congestion control in files customization system.Based on the discussion about key technologies, design a files customization system FCS in network environment. At the last, put forward some shortages in the system realization and the farther improvement steps.更多还原