M. Ahamad, M. Ammar, and S. Cheung. Replicated data management in distributed systems. In T. L. Casavant and M. Singhal, editors, Readings in Distributed Computing Systems, pages 572--591. IEEE Computer Society Press, Los Alamitos, CA, January 1994.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... [6] Among the replica control protocols that can achieve one copy serializability when used in conjunction with appropriate mechanisms for concurrency control (e.g. two phase locking) and atomic commitment (e.g. two phase commit) we identify the read one write all approach (ROWA) [4], the primary copy approach [24] the quorum consensus scheme [11] and the available copies method [12] The read one write all approach is one of the simplest protocols for managing replicated data. Read operations are allowed to read any copy, and write operations are required to write all ....

M. Ahamad, M. Ammar, and S. Cheung. Replicated data management in distributed systems. In T. L. Casavant and M. Singhal, editors, Readings in Distributed Computing Systems, pages 572-591. IEEE Computer Society Press, Los Alamitos, CA, January 1994.

....all clients to access data, including objects that are already in use by other clients, and to delay synchronization to the point when data is returned to the central server. This requires sophisticated strategies for synchronizing all existing object copies with the changed data (see, e.g. 21] [22]) A useful strategy (based on [23] that we adopted for our environment reduces synchronization problems by adjusting the cooperation model that defines ownership and access rights, distributes meta information on what is happening with workspace objects, and allows usercontrolled coordination ....

Ahamad M., Ammar M.H., Cheung S.Y: Replicated Data Management in Distributed Systems; in: Readings in Distributed Computing Systems (edited by: Casavant T.L., Singhal M.), IEEE CS Press, Los Alamitos, CA, pp. 572591, 1994.

....replication is correct if it ensures one copy serialisability. Several replica control protocols have been proposed and discussed that tolerate different classes of failures [Cer91] An indepth classification of integrated replica control mechanisms in distributed database systems is discussed in [Aha92, Cer91, Che92]. The replica control protocol is a synchronisation layer that is imposed by the distributed system to hide the fact that data is replicated and it presents itself to the user as if only one copy of the data item is present. The replica control protocol provides a set of rules to regulate reads ....

....A 3 B 4 A 5 A 6 Fixed network connections B 1 A 4 B 5 Zone of Influence X i th copy of data item X B 2 Fig.1. Architecture of an MDS with mobile hosts 2. Replica Control Protocols and Their Taxonomy The various replica control protocols can be broadly classified into three categories [Aha92]: primary copy method; quorum consensus method; available copies method. In the primary copy method [Aha92] each node keeps a list of nodes with which it can communicate. The replica maintained by the node that is lowest in ordering in the up list is by definition the primary copy of the ....

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Ahamad, M., Ammar, M.H. & Cheung, S.Y. Replicated Data Management In Distributed Systems, In: Readings in Distributed Computing Systems, 1992, p.572-591.

....copy could be received from a number of servers where the object is replicated. A number of techniques have been previously explored for maintaining the consistency of distributed objects which included ordered group communication [10] replicated data management protocols such as quorum protocols [1], and consistency protocols that have been developed in distributed shared memory systems. We believe that these techniques are inadequate in the application and system environment presented here because of the following reasons: Since a user may navigate through a part of virtual space quickly ....

M. Ahamad, M. Ammar and S.Y. Cheung, "Replicated Data Management in Distributed Systems", in Advances in Distributed Computing: Concepts and Design, IEEE ComputerSociety Press, T.L. Casavant and M. Singhal eds., 1993.

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M. Ahamad, M. Ammar, and S. Cheung. Replicated data management in distributed systems. In T. L. Casavant and M. Singhal, editors, Readings in Distributed Computing Systems, pages 572--591. IEEE Computer Society Press, Los Alamitos, CA, January 1994.

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