NewsCache: a high performance cache implementation for Usenet news

Authors:
Thomas Gschwind;Manfred Hauswirth
Affiliations:
Distributed Systems Group, Technische Universität Wien, Wien, Austria, Europe;Distributed Systems Group, Technische Universität Wien, Wien, Austria, Europe
Venue:
ATEC '99 Proceedings of the annual conference on USENIX Annual Technical Conference
Year:
1999

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Abstract

Usenet News is reaching its limits as current traffic strains the available infrastructure. News data volume increases steadily and competition with other Internet services has intensified. Consequently bandwidth requirements are often beyond that provided by typical links and the processing power needed exceeds a single system's capabilities. A rapidly growing number of users, especially attracted by WWW, overloads communication links and makes bandwidth a scarce resource. While an elaborate caching infrastructure was adopted for the WWW, Usenet News still uses most of its originally defined infrastructure. Caching techniques have not yet been adopted on a large scale. We believe that this is due to the lack of efficient cache implementations. In this paper we present a high performance cache server for Usenet News that helps to conserve network bandwidth, computing power, and disk storage and is compatible with the current infrastructure and standards. After a thorough comparison of existing news database formats and replacement strategies we designed and implemented NEWSCACHE to remedy Usenet News bottlenecks. We present an empirical comparison of different cache replacement strategies as well as an evaluation of the use of NEWSCACHE as a news server.