On conspiracies and hyperfairness in distributed computing

  • Authors:
  • Hagen Völzer

  • Affiliations:
  • Institute for Theoretical Computer Science, University of Lübeck, Germany

  • Venue:
  • DISC'05 Proceedings of the 19th international conference on Distributed Computing
  • Year:
  • 2005

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Abstract

We study the phenomenon of conspiracies, a certain class of livelocks, in distributed computations. This elementary phenomenon occurs in systems with shared variables, shared actions as well as in message-passing systems. We propose a new and simple characterization via a new notion of hyperfairness, which postulates the absence of conspiracies. We argue that hyperfairness is a useful tool for understanding some impossibility results, in particular results involving crash-tolerance. As a main result, we show that a large subclass of hyperfairness can be implemented through partial synchrony and randomization.