AdoB: Bridging Benign and Byzantine Consensus with Atomic Distributed Objects

Author:

Honoré Wolf1ORCID,Qiu Longfei1ORCID,Kim Yoonseung1ORCID,Shin Ji-Yong2ORCID,Kim Jieung3ORCID,Shao Zhong1ORCID

Affiliation:

1. Yale University, New Haven, USA

2. Northeastern University, Boston, USA

3. Inha University, Incheon, South Korea

Abstract

Achieving consensus is a challenging and ubiquitous problem in distributed systems that is only made harder by the introduction of malicious byzantine servers. While significant effort has been devoted to the benign and byzantine failure models individually, no prior work has considered the mechanized verification of both in a generic way. We claim this is due to the lack of an appropriate abstraction that is capable of representing both benign and byzantine consensus without either losing too much detail or becoming impractically complex. We build on recent work on the atomic distributed object model to fill this void with a novel abstraction called AdoB. In addition to revealing important insights into the essence of consensus, this abstraction has practical benefits for easing distributed system verification. As a case study, we proved safety and liveness properties for AdoB in Coq, which are the first such mechanized proofs to handle benign and byzantine consensus in a unified manner. We also demonstrate that AdoB faithfully models real consensus protocols by proving it is refined by standard network-level specifications of Fast Paxos and a variant of Jolteon.

Funder

NSF

DARPA

Publisher

Association for Computing Machinery (ACM)

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1. LiDO: Linearizable Byzantine Distributed Objects with Refinement-Based Liveness Proofs;Proceedings of the ACM on Programming Languages;2024-06-20

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