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About this book
As the structure of contemporary communication networks grows more complex, practical networked distributed systems become prone to component failures. Fault-tolerant consensus in message-passing systems allows participants in the system to agree on a common value despite the malfunction or misbehavior of some components. It is a task of fundamental importance for distributed computing, due to its numerous applications.
We summarize studies on the topological conditions that determine the feasibility of consensus, mainly focusing on directed networks and the case of restricted topology knowledge at each participant. Recently, significant efforts have been devoted to fully characterize the underlying communication networks in which variations of fault-tolerant consensus can be achieved. Although the deduction of analogous topological conditions for undirected networks of known topology had shortly followed the introduction of the problem, their extension to the directed network case has been proven a highly non-trivial task. Moreover, global knowledge restrictions, inherent in modern large-scale networks, require more elaborate arguments concerning the locality of distributed computations. In this work, we present the techniques and ideas used to resolve these issues.
Recent studies indicate a number of parameters that affect the topological conditions under which consensus can be achieved, namely, the fault model, the degree of system synchrony (synchronous vs. asynchronous), the type of agreement (exact vs. approximate), the level of topology knowledge, and the algorithm class used (general vs. iterative). We outline the feasibility and impossibility results for various combinations of the above parameters, extensively illustrating the relation between network topology and consensus.
Table of contents (8 chapters)
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Front Matter
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Network Topology and Fault-Tolerance
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Front Matter
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Consensus with a Global Adversary
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Front Matter
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Other Adversarial Models
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Front Matter
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Back Matter
Authors and Affiliations
About the authors
Bibliographic Information
Book Title: Network Topology and Fault-Tolerant Consensus
Authors: Dimitris Sakavalas, Lewis Tseng
Series Title: Synthesis Lectures on Distributed Computing Theory
DOI: https://doi.org/10.1007/978-3-031-02014-8
Publisher: Springer Cham
eBook Packages: Synthesis Collection of Technology (R0), eBColl Synthesis Collection 9
Copyright Information: Springer Nature Switzerland AG 2019
Softcover ISBN: 978-3-031-00886-3Published: 13 May 2019
eBook ISBN: 978-3-031-02014-8Published: 31 May 2022
Series ISSN: 2155-1626
Series E-ISSN: 2155-1634
Edition Number: 1
Number of Pages: XXI, 129
Topics: Computer Science, general, Coding and Information Theory, Data Structures and Information Theory