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

Zhou Su*, Masato Oguro, Jiro Katto, Yasuhiko Yasuda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Content delivery network improves end-user performance by replicating Web contents on a group of geographically distributed sites interconnected over the Internet. However, with the development whereby content distribution 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 better consistency management than conventional methods with the reduced the old hit ratio and network traffic.

Original languageEnglish
Pages (from-to)2729-2737
Number of pages9
JournalIEICE Transactions on Communications
Issue number10
Publication statusPublished - 2007


  • Consistency algorithm
  • Content delivery networks
  • Network traffic
  • Web cache performance

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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