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A Polylogarithmic-Competitive Algorithm for the k-Server Problem (1110.1580v1)
Published 7 Oct 2011 in cs.DS
Abstract: We give the first polylogarithmic-competitive randomized online algorithm for the $k$-server problem on an arbitrary finite metric space. In particular, our algorithm achieves a competitive ratio of O(log3 n log2 k log log n) for any metric space on n points. Our algorithm improves upon the deterministic (2k-1)-competitive algorithm of Koutsoupias and Papadimitriou [J.ACM'95] whenever n is sub-exponential in k.