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Preference-based content replacement using recency-latency tradeoff

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Abstract

This work introduces and establishes a new model for cache management, where clients suggest preferences regarding their expectations for the time they are willing to wait, and the level of obsolescence they are willing to tolerate. The cache uses these preferences to decide upon entrance and exit of objects to and from its storage, and select the best copy of requested object among all available copies (fresh, cached, remote). We introduce three replacement policies, each evicts objects based on ongoing scores, considering users’ preferences combined with other objects’ properties such as size, obsolescence rate and popularity. Each replacement algorithm follows a different strategy: (a) an optimal solution that use dynamic programming approach to find the best objects to be kept (b) another optimal solution that use branch and bound approach to find the worst objects to be thrown out (c) an algorithm that use heuristic approach to efficiently select the objects to be evicted. Using these replacement algorithms the cache is able to keep the objects that are best suited for users preferences and dump the other objects. We compare our proposed algorithms to the Least-Recently-Used algorithm, and provide evidence to the advantages of our algorithms providing better service to cache’s users with less burden on network resources and reduced workloads on origin servers.

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  1. The Max Stern Yezreel Valley College, Jezreel Valley, Israel

    Rami Rashkovits

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  1. Rami Rashkovits
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Correspondence to Rami Rashkovits.

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Rashkovits, R. Preference-based content replacement using recency-latency tradeoff. World Wide Web 19, 323–350 (2016). https://doi.org/10.1007/s11280-014-0313-1

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  • DOI: https://doi.org/10.1007/s11280-014-0313-1

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