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Related Experiment Videos

Synchronous consensus under hybrid process and link failures.

Martin Biely1, Ulrich Schmid, Bettina Weiss

  • 1Technische Universität Wien, Institut für Technische Informatik, Embedded Computing Systems Group E182/2, Treitlstraße 1-3, A-1040 Vienna, Austria.

Theoretical Computer Science
|October 28, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a hybrid failure model for distributed systems, accounting for communication link failures. It demonstrates that consensus algorithms can tolerate these failures with minor increases in system size.

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Area of Science:

  • Computer Science
  • Distributed Systems
  • Fault Tolerance

Background:

  • Conventional hybrid process failure models do not fully capture communication link failures in distributed systems.
  • Existing link failure models have limitations in assumption coverage within probabilistic settings.

Purpose of the Study:

  • To introduce a comprehensive hybrid failure model for synchronous distributed systems that incorporates communication link failures.
  • To demonstrate the adaptability of synchronous consensus algorithms to this new failure model.
  • To analyze the impact of link failures on consensus algorithms and explore the role of authentication.

Main Methods:

  • Extending a conventional hybrid process failure model to include send and receive link failures (omissions and erroneous messages).
  • Adapting well-known synchronous consensus algorithms to function within the proposed failure model.
  • Deriving detailed formulas for the required number of processes and rounds for consensus.
  • Investigating the influence of authentication and uniform consensus properties.

Main Results:

  • The proposed hybrid failure model surpasses existing link failure modeling approaches in assumption coverage.
  • Synchronous consensus algorithms can be adapted to the new model by slightly increasing the number of processes.
  • The derived formulas for process and round requirements are tight, aligning with established lower bounds.
  • The study explores the trade-offs introduced by authentication in the context of link failures.

Conclusions:

  • The developed hybrid failure model provides a more comprehensive representation of failures in synchronous distributed systems.
  • Consensus is achievable under this model, contrary to expectations given unrestricted link failures.
  • The findings offer practical insights into designing fault-tolerant distributed systems and provide tight bounds for resource requirements.