Agreement on the group membership in synchronous distributed systems

  • Rogério de Lemos
  • Paul D. Ezhilchelvan
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 486)


When a group of processors in a distributed system cooperate with each other on processing of a common task, it is often necessary for the non-faulty processors to have a mutually consistent knowledge of the set of processors that can be considered to be non-faulty. The set of non-faulty processors in the group — known as the group membership — will change for example when a processor crashes or when a crashed processor, after restart, joins the group. These changes should be known by all non-faulty processors as quickly as possible within a known bounded time interval. We present an algorithm by which non-faulty processors of a group of bounded size will be able to maintain a consistent and timely knowledge of the group membership. Processors in the group are assumed to execute the algorithm in a synchronous manner and at periodic intervals or cycles of some fixed length. In an execution of the proposed algorithm, every non-faulty processor knows of any processor failure within at most two cycles following the cycle in which the failure occurred, and a restarted processor can join the group in two cycles. At most less than half the number of processors are assumed to fail in any three consecutive cycles.


group membership distributed algorithms broadcast networks fault-tolerance 


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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Rogério de Lemos
    • 1
  • Paul D. Ezhilchelvan
    • 1
  1. 1.Computing LaboratoryUniversity of Newcastle upon TyneUK

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