%0 Conference Paper
%B Fifth International Conference on Autonomic and Autonomous Systems - ICAS
%D 2009
%T Fast estimation of aggregates in unstructured networks
%A Carlos Baquero Moreno
%A Paulo Sérgio Almeida
%A Raquel Menezes
%C Valencia, Spain
%I IEEE
%P 88–93
%X <p>Aggregation of data values plays an important role on distributed computations, in particular over peer-to-peer and sensor networks, as it can provide a summary of some global system property and direct the actions of self-adaptive distributed algorithms. Examples include using estimates of the network size to dimension distributed hash tables or estimates of the average system load to direct loadbalancing. Distributed aggregation using non-idempotent functions, like sums, is not trivial as it is not easy to prevent a given value from being accounted for multiple times; this is especially the case if no centralized algorithms or global identifiers can be used.This paper introduces Extrema Propagation, a probabilistic technique for distributed estimation of the sum of positive real numbers. The technique relies on the exchange of duplicate insensitive messages and can be applied in flood and/or epidemic settings, where multi-path routing occurs; it is tolerant of message loss; it is fast, as the number of message exchange steps equals the diameter; and it is fully distributed, with no single point of failure and the result produced at every node.</p>
%8 April
%> https://haslab.uminho.pt/sites/default/files/cbm/files/ieeefastfinalicas2009.pdf