Reliability and security in the codeen content distribution network

Limin Wang, Kyoung Soo Park, Ruoming Pang, Vivek Pai, Larry Peterson

Research output: Contribution to conferencePaperpeer-review

148 Scopus citations


With the advent of large-scale, wide-area networking testbeds, researchers can deploy long-running distributed services that interact with other resources on the Web. The CoDeeN Content Distribution Network, deployed on PlanetLab, uses a network of caching Web proxy servers to intelligently distribute and cache requests from a potentially large client population. We have been running this system nearly continuously since June 2003, allowing open access from any client in the world. In that time, it has become the most heavily-used long-running service on PlanetLab, handling over four million accesses per day. In this paper, we discuss the design of our system, focusing on the reliability and security mechanisms that have kept the service in operation. Our reliability mechanisms assess node health, preventing failing nodes from disrupting the operation of the overall system. Our security mechanisms protect nodes from being exploited and from being implicated in malicious activities, problems that commonly plague other open proxies. We believe that future services, especially peer-to-peer systems, will require similar mechanisms as more services are deployed on non-dedicated distributed systems, and as their interaction with existing protocols and systems increases. Our experiences with CoDeeN and our data on its availability should serve as an important starting point for designers of future systems.

Original languageEnglish (US)
StatePublished - 2004
Externally publishedYes
Event2004 USENIX Annual Technical Conference - Boston, United States
Duration: Jun 27 2004Jul 2 2004


Conference2004 USENIX Annual Technical Conference
Country/TerritoryUnited States

ASJC Scopus subject areas

  • General Computer Science


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