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Proceedings Paper

RCache: design and analysis of scalable fault-tolerant multimedia stream caching schemes
Author(s): Katherine Guo; Milind M. Buddhikot; Youngsu Chae; Subhash Suri
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Paper Abstract

In the current Internet, web content is increasingly being cached closer to the end-user to reduce network and web server load and therefore improve performance and user perceived quality. Existing web caching systems typically cache entire web documents and attempt to keep them consistent with the origin server. This approach works well for text and images; for bandwidth intensive multimedia data such as audio and video, caching entire documents is not cost effective and does not scale. An alternative approach is to cache parts of the multimedia stream on different caches in the network and coordinate stream playback from these caches. In such a case, the collection of cooperating distributed caches act as a single cache that is both scalable and fault-tolerant. This paper focuses on the design and the evaluation of novel data placement and replacement techniques for such distributed caches. Specifically, we propose schemes that work together: (1) RCache, a family of easy-to-implement, fault-tolerant multimedia data layout schemes that incorporate novel intra- and inter-clip replication controls, (2) TwoD, a two-dimensional local data replacement scheme based on the concept of segment popularity used for data replacement ordering at each cache. Our schemes optimize storage space, start-up latency, server load, network bandwidth usage, and overhead from playback switch-overs. Our simulation results show that the RCache schemes provide 4 - 9 times higher cache hit ratio than a comparable traditional web caching system with the same amount of storage space.

Paper Details

Date Published: 25 July 2001
PDF: 19 pages
Proc. SPIE 4526, Scalability and Traffic Control in IP Networks, (25 July 2001); doi: 10.1117/12.434416
Show Author Affiliations
Katherine Guo, Lucent Technologies/Bell Labs. (United States)
Milind M. Buddhikot, Lucent Technologies/Bell Labs. (United States)
Youngsu Chae, Georgia Institute of Technology (United States)
Subhash Suri, Univ. of California/Santa Barbara (United States)


Published in SPIE Proceedings Vol. 4526:
Scalability and Traffic Control in IP Networks
Sonia Fahmy; Kihong Park, Editor(s)

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