Scalable Maintenance for Strong Web Consistency in Dynamic Content Delivery Overlays

— Content Delivery Overlays improves end-user performance by replicating Web contents on a group of geographically distributed sites interconnected over the Internet. However, with the development whereby overlay systems can manage dynamically changing files, an important issue to be resolved is consistency management, which means the cached replicas on different sites must be updated if the originals change. In this paper, based on the analytical formulation of object freshness, web access distribution and network topology, we derive a novel algorithm as follows: (1) For a given content which has been changed on its original server, only a limited number of its replicas instead of all replicas are updated. (2) After a replica has been selected for update, the latest version will be sent from an algorithm-decided site instead of from its original server. Simulation results verify that the proposed algorithm provides much better consistency management than conventional methods with th...

• Type: Conference
• Year: 2007
• Where: ICC
• Authors: Zhou Su, Jiro Katto, Yasuhiko Yasuda
• Keywords: Communications, Consistency Management, ICC 2007, Original Server, Replica