![]() ![]() System look like and how do clients use pub-sub systems in practice? Previous research in this area has focused on aspects, such as system architecture, event notification, and content filtering algorithms, but has left a fundamental issue untackled, namely what does the workload of a pub-sub Publish-subscribe or pub-sub systems are gaining wide acceptance with applications spanning information delivery, sensor monitoring, auction systems, and air traffic control. Overall, this paper presents an analysis of RSS, the first widely deployed publish-subscribe system, and provides insights for the design of next generation publish-subscribe systems. The update rate of RSS feeds is widely distributed 55% of RSS feeds are updated hourly, while 25% show no updates for several days.Īnd, only small portions of RSS content typically change during an update 64% of updates involve less than three lines of the RSS content. We find that RSS workload resembles the Web in content size and popularity feeds are typically small (less than 10KB), albeit with a heavy tail, and feed popularity follows a power law distribution. ![]() This paper examines RSS, a newly emerging, widely used publish-subscribe system for Web micronews.īased on a trace study spanning 45 days at a medium-size academic department and periodic polling of approximately 100,000 RSS feeds, we extract characteristics of RSS content and usage. Has been little characterization of how publish-subscribe systems are used in practice. Since the last decade, few established benchmarks have emerged, and there While publish-subscribe systems have attracted much research interest ![]()
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