article

Practical byzantine fault tolerance and proactive recovery

Authors:

Miguel Castro,

Barbara LiskovAuthors Info & Claims

ACM Transactions on Computer Systems (TOCS), Volume 20, Issue 4

Pages 398 - 461

https://doi.org/10.1145/571637.571640

Published: 01 November 2002 Publication History

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Abstract

Our growing reliance on online services accessible on the Internet demands highly available systems that provide correct service without interruptions. Software bugs, operator mistakes, and malicious attacks are a major cause of service interruptions and they can cause arbitrary behavior, that is, Byzantine faults. This article describes a new replication algorithm, BFT, that can be used to build highly available systems that tolerate Byzantine faults. BFT can be used in practice to implement real services: it performs well, it is safe in asynchronous environments such as the Internet, it incorporates mechanisms to defend against Byzantine-faulty clients, and it recovers replicas proactively. The recovery mechanism allows the algorithm to tolerate any number of faults over the lifetime of the system provided fewer than 1/3 of the replicas become faulty within a small window of vulnerability. BFT has been implemented as a generic program library with a simple interface. We used the library to implement the first Byzantine-fault-tolerant NFS file system, BFS. The BFT library and BFS perform well because the library incorporates several important optimizations, the most important of which is the use of symmetric cryptography to authenticate messages. The performance results show that BFS performs 2% faster to 24% slower than production implementations of the NFS protocol that are not replicated. This supports our claim that the BFT library can be used to build practical systems that tolerate Byzantine faults.

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Reviews

Reviewer: Cristiano di Flora

The most challenging faults in the context of modern wide-area distributed applications are those caused by software bugs, intentional attacks, and operator mistakes. Such faults, called Byzantine faults, cause arbitrary behavior of the overall system. Building Byzantine fault tolerant (BFT) systems is not a straightforward task; this paper presents an extremely interesting and effective solution for building systems that tolerate Byzantine faults. Castro and Liskov contribute significantly to the solution of this problem, providing readers with a complete and exhaustive description of their BFT algorithm. The main contribution of this work is twofold. First, the description of the algorithm is engineered in a perfect way. Even researchers who are not interested in fault tolerance issues may gain a lot of experience by reading this paper. The algorithm is described in detail, and the authors have done a good job of documenting its vulnerability window (and strategies to dimension and configure it); its optimizations (which make it usable in practice); and its implementation (as a generic library), providing the reader with a practical case study (namely, the first BFT distributed file system) and a complete performance analysis. Second, experienced researchers in the field of fault tolerance in distributed systems will find many explicit or implicit guidelines for addressing BFT issues, and for evaluating and predicting the behavior of the BFT algorithm in particular contexts. Performance analysis and evaluation are very accurately and deeply documented, and the authors also provide the reader with both the necessary guidelines for customizing the performance and behavior of the algorithm and a substantial section devoted to related work. The inclusion of some additional figures in the middle of the paper (particularly in sections 5 and 6), or of some more standard formalism for the description of the algorithm, would have helped inexperienced readers. Nevertheless, this paper remains a worthwhile read, both for those interested in BFT, and for those interested in evaluating and modeling complex algorithms. Online Computing Reviews Service

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cover image ACM Transactions on Computer Systems

ACM Transactions on Computer Systems Volume 20, Issue 4

November 2002

133 pages

ISSN:0734-2071

EISSN:1557-7333

DOI:10.1145/571637

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Association for Computing Machinery

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Published: 01 November 2002

Published in TOCS Volume 20, Issue 4

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