Overcoming Congestion in Distributed Coloring

05/28/2022

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by   Magnus M. Halldorsson, et al.

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We present a new technique to efficiently sample and communicate a large number of elements from a distributed sampling space. When used in the context of a recent LOCAL algorithm for (degree+1)-list-coloring (D1LC), this allows us to solve D1LC in O(log^5 log n) CONGEST rounds, and in only O(log^* n) rounds when the graph has minimum degree Ω(log^7 n), w.h.p. The technique also has immediate applications in testing some graph properties locally, and for estimating the sparsity/density of local subgraphs in O(1) CONGEST rounds, w.h.p.