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利用文件优化分配实现Web服务器集群负载均衡的研究

The Study of Realizating Web Server Cluster System Load Balancing by Optimizing Allocation of Files

【作者】 李定锁

【导师】 郭成城;

【作者基本信息】 武汉大学 , 通信与信息系统, 2004, 硕士

【摘要】 随着因特网的飞速发展和网络应用的广泛展开,人们对信息服务平台提出了更高的要求,不仅需要快速响应性、高可伸缩性、高可用性、易管理性、高性能价格比,还需要提供对关键企业级应用非常有价值的功能特性。服务器集群系统是近年来随着Internet和Web的发展兴起的一种具有强大生命力的新兴技术,通过请求分配使集群达到负载均衡是提高这种系统运行效率的基本手段。虽然目前已经对这个课题进行了很多研究工作,但这些工作大多偏重于前端的调度,而忽略了后台服务器上文档的分布及文档间的相关性。本文在前人研究的基础上,深入地研究了Web文档的拷贝、相关性等一系列特性,在分析了节点服务器的能力后,把Web文档优化分配在后端节点上,来实现服务器集群的负载均衡。本文的研究工作主要包含以下几个方面的内容和成果: 1、研究了Web文档的各种特性,并将这些特性作为Web服务器集群系统中文档优化分配的依据。 2、实现了Web服务器集群后台文档访问、分布的监测系统。 3、提出了Web文档间的条件访问概率,文档的拷贝和相关性,并研究了Web文档间链接和条件访问概率的运算。 4、提出并实现了一种Web文档归类算法——文档簇。 5、研究并改进了已有的文档优化分配理论,用遗传法、贪心法等实现了具体分配。 6、提出了Web文档的初始优化分配、定期优化分配和即时优化分配。

【Abstract】 With the explosive growth of Internet and World Wide Web’s traffic, High Scalability, Reliability, Availability and Efficient Cost/Performance ratio are strongly required for the Information Service Platform-Network Servers. Server Cluster is a newly developed technology with the thriving of the Internet and the Web. Achieving load balancing by request dispatching is one of the basic strategies for improving the performance and efficiency of this kind of systems. Although a lot of researches have been made within this field, people pay importance to the form’s dispatching and ignore the distribution and correlation of the files on the latter’s servers. On the basis of the anterior researches, this paper studies on a series of characteristics of the web files, such as copies and correlation. After analyzing the ability of the servers, all files are allocated to the servers suitably, which realizes the load balancing of the server cluster. The contributions of this paper are as the following:1 Studying the characteristics of all kind of web files, and optimizing the web files according to these characteristics.2 Realizing the monitor system of the visit and the distribution of the latter’s web files.3 This paper produces the conditional-visit-probability, the copies and the correlation of the web files, and studying the operation method.4 This paper produces and realizes an algorithm of the web file classification 桭ile Cluster.5 Studying and improving the optimizing allocation theory of the files, and realizing the material allocation by the cupidity and the genetic algorithm.6 Producing the initializing optimizing allocation , the periodic optimizing allocation and the instant optimizing allocation of the web files.

  • 【网络出版投稿人】 武汉大学
  • 【网络出版年期】2004年 04期
  • 【分类号】TP393.05
  • 【被引频次】1
  • 【下载频次】150
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