The state of the art in locally distributed Web-server systems

摘要: The overall increase in traffic on the World Wide Web is augmenting user-perceived response times from popular sites, especially conjunction with special events. System platforms that do not replicate information content cannot provide needed scalability to handle large volumes and match rapid dramatic changes number of clients. need improve performance Web-based services has produced a variety novel delivery architectures. This article will focus system architectures consist multiple server nodes distributed local area, one or more mechanisms spread client requests among nodes. After years continual proposals new solutions, routing mechanisms, policies (the first dated back 1994 when NCSA site had face million per day), many problems concerning for sites have been solved. Other issues remain be addressed, at network application layer, but main techniques methodologies building scalable placed single location are settled now. classifies describes split load nodes, discussing both alternative sharing policies. To this purpose, it focuses architectures, internal dispatching request algorithms designing implementing Web-server systems under control provider. It identifies also some open research associated use highly accessed sites.