Web QoS控制研究综述

Web Quality of Service:A Survey

Internet的服务模式正由传统的数据通信与信息浏览向电子交易与服务转变 ,Web服务器系统作为支持电子商务的核心设施 ,需要对不同的用户或HTTP请求提供区分服务和性能保证 ,因此必须具备建立和支持服务质量 (QualityofService ,QoS)控制的机制与策略 .该文综述了WebQoS控制的研究现状 ,包括Web请求的分类机制、Web服务器应用软件的QoS控制机制、操作系统的WebQoS控制机制、中间件的WebQoS控制机制以及Web服务器集群系统的QoS控制机制与策略 ,并分析了进一步的研究方向 .

With the evolvement of the E commerce, the Internet is undergoing substantial changes from a communication and browsing infrastructure to a medium for conducting business and selling services. These changes place the Web server at the center of the E commerce infrastructure with increasing requirements for providing service differentiation and performance assurance. To that end, Web servers must have mechanisms and policies for establishing and supporting QoS. A summary of the Web QoS technologies considered in the literatures is presented, including the methods of request classification, the Web QoS supporting mechanisms provided by the Web server software, the operating system, and the middleware, and the QoS control mechanisms and policies in the Web server clusters. Research directions and open problems in this area are also discussed.