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<p>A nonblocking quorum protocol for replica control which guarantees one-copyserializability is developed. The effects of a nonblocking protocol are analyzed, and it isshown that the gains can be substantial under certain conditions. It is demonstrated thatin order for the protocol to be useful, it must be integrated with a propagationmechanism. It is also shown that the access latency can be reduced significantly in areplicated environment. An interesting aspect of the quorum protocol is that it essentiallyuses a read quorom/write-quorom approach for concurrency control but uses aread-one/write-all approach for replica control. It is shown that the nonblocking quoromprotocol provides the same level of availability and fault tolerance as the quorum protocol proposed by D.K. Gifford (1979).</p>
Index Termsnonblocking quorum protocol; replica control; one-copy serializability; access latency;availability; fault tolerance; database theory; distributed databases; fault tolerantcomputing; protocols

D. Agrawal and A. Bernstein, "A Nonblocking Quorum Consensus Protocol for Replicated Data," in IEEE Transactions on Parallel & Distributed Systems, vol. 2, no. , pp. 171-179, 1991.
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