Towards Content Distribution Networks with Latency Guarantees

Authors:Huang, Chengdu, Department of Computer ScienceUniversity of Virginia Abdelzaher, Tarek, Department of Computer ScienceUniversity of Virginia

This paper investigates the performance of a content distribution network designed to provide bounded content access latency. Content can be divided into multiple classes with different configurable per-class delay bounds. The network uses a simple distributed algorithm to dynamically select a subset of its proxy servers for different classes such that a global per-class delay bound is achieved on content access. The content distribution algo- rithm is implemented and tested on PlanetLab [24], a world-wide distributed Internet testbed. Evaluation results demonstrate that despite Internet delay variability, subsecond delay bounds (of 200-500ms) can be guaranteed with a very high probability at only a moderate content replication cost. The distribution algorithm achieves a 4 to 5 fold reduction in the number of response-time violations compared to prior content distribution approaches that attempt to minimize average latency. To the authors´┐Ż knowledge, this paper presents the first wide-area perfor- mance evaluation of an algorithm designed to bound maximum content access latency, as opposed to optimizing an average performance metric.

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Source Citation:

Huang, Chengdu, and Tarek Abdelzaher. "Towards Content Distribution Networks with Latency Guarantees." University of Virginia Dept. of Computer Science Tech Report (2004).

University of Virginia, Department of Computer Science
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