COMMONWEALTH: Architecture and Protocols for Scalable WWW Service

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The phenomenal growth of the World Wide Web is imposing considerable strain on Internet resources and Web servers, prompting numerous concerns about the Web's continued viability. The success of high-performance Web servers in alleviating these performance problems is ultimately limited, unless Web services are designed to be inherently scalable. The Commonwealth project aims to design, implement, and evaluate a prototypical architecture and a set of associated protocols for scalable Web services. The Commonwealth architecture for hosting scalable Web services allows scalability through (1) parallel processing on tightly-coupled nodes within a Web site, and (2) load distribution across loosely-coupled Web sites. Commonwealth's underlying philosophy is to achieve a WEALTH of performance through the use of COMMON components, and to do so along an incremental upgrade path. The Commonwealth protoype will catalyze basic research in four main areas: (1) Data placement (caching, prefetching, and dissemination protocols); (2) Resource management (scheduling, load balancing, and admission control protocols); (3) Networking (routing, packet redirection, and connection migration) and (4) Middleware services (replication and resource discovery). These problems will be addressed with particular attention to the issue of high-variability, which---in previous work by the principal investigators---was shown to pose significant problems for the design of Internet-based systems.