A nonblocking quorum consensus protocol for replicated data

Divyakant Agrawal, Arthur J. Bernstein

Research output: Contribution to journalArticle

11 Citations (Scopus)


A nonblocking quorum protocol for replica control which guarantees one-copy serializability is developed. The effects of a nonblocking protocol are analyzed, and it is shown that the gains can be substantial under certain conditions. It is demonstrated that in order for the protocol to be useful, it must be integrated with a propagation mechanism. It is also shown that the access latency can be reduced significantly in a replicated environment. An interesting aspect of the quorum protocol is that it essentially uses a read-quorom/write-quorom approach for concurrency control but uses a read-one/write-all approach for replica control. It is shown that the nonblocking quorom protocol provides the same level of availability and fault tolerance as the quorum protocol proposed by D. K. Gifford (1979).

Original languageEnglish
Pages (from-to)171-179
Number of pages9
JournalIEEE Transactions on Parallel and Distributed Systems
Issue number2
Publication statusPublished - 1 Apr 1991
Externally publishedYes


ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Electrical and Electronic Engineering
  • Theoretical Computer Science

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