15.09.2017
Breaking the \(\log n\) barrier on rumor spreading
Erschienen in: Distributed Computing | Ausgabe 6/2018
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Abstract
push&pull
in the random phone call model (i.e., uniform gossip in the complete graph). A matching lower bound of \(\varOmega (\log n)\) is also known for this special case. Under the assumption of this model and with a natural addition that nodes can call a partner once they learn its address (e.g., its IP address) we present a new distributed, address-oblivious and robust algorithm that uses push&pull
with pointer jumping to spread a rumor to all nodes in only \(O(\sqrt{\log n})\) rounds, w.h.p. This algorithm can also cope with \(F= O(n/2^{\sqrt{\log n}})\) node failures, in which case all but O(F) nodes become informed within \(O(\sqrt{\log n})\) rounds, w.h.p.