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aComputer Science and Information Management, Asian Institute of Technology,June 6th, 2010
A Service-Level Agreement (SLA) provides surety for specific quality at- tributes to the consumers of services. However, current SLAs offered by cloud infrastructure providers do not address response time, which, from the user’s point of view, is the most important quality attribute for Web applications. Satisfying a maximum average response time guarantee for Web applications is difficult for two main reasons: first, traffic patterns are highly dynamic and difficult to predict accurately; second, the complex nature of multi-tier Web applications increases the difficulty of identifying bottlenecks and resolv- ing them automatically. This paper proposes a methodology and presents a working prototype system for automatic detection and resolution of bottle- necks in a multi-tier Web application hosted on a cloud in order to satisfy specific maximum response time requirements. It also proposes a method for identifying and retracting over-provisioned resources in multi-tier cloud- hosted We
