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We consider the problem of extending the analysis of balls and bins
processes where a ball is placed in the least loaded of d randomly
chosen bins to cover deletions. In particular, we are interested in
the case where the system maintains a fixed load, and deletions are
determined by an adversary before the process begins. We show that
with high probability the load in any bin is O(log log n). In
fact, this result follows from recent work by Cole et al. concerning
a more difficult problem of routing in a butterfly network.
The main contribution of this paper is to give a different proof of this bound, which follows the lines of the analysis of Azar, Broder, Karlin, and Upfal for the corresponding static load balancing problem. We also give a specialized (and hence simpler) version of the argument from the paper by Cole et al. for the balls and bins scenario. Finally, we provide an alternative analysis also based on the approach of Azar, Broder, Karlin, and Upfal for the special case where items are deleted according to their age. Although this analysis does not yield better bounds than our argument for the general case, it is interesting because it utilizes a two-dimensional family of random variables in order to account for the age of the items. This technique may be of more general use.
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