Selective update approach to maintain strong Web consistency in dynamic content delivery

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