Abstract:
Abstract – Efficient data retrieval in a peer-to-peer system like Freenet is a challenging problem. In this paper we study the impact of cache replacement policy on the performance of Freenet. We find that, with Freenet’s LRU cache replacement, there is a steep reduction in the hit ratio with increasing load. Based on intuition from the small-world models and the recent theoretical results by Kleinberg, we propose an enhancedclustering cache replacement scheme for use in place of LRU. Such a replacement scheme forces the routing tables to resemble neighbor relationships in a small-world acquaintance graph-- clustering with light randomness. In our simulation this new scheme improved the request hit ratio dramatically while keeping the small average hops per successful request comparable to LRU. A simple, highly idealized model of Freenet under clustering with light randomness proves that the 2 expected message delivery time in Freenet is O ( log n) if the routing tables satisfy the small-world model and have the size (log) 2 θ n.
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