## Files in this item

FilesDescriptionFormat

application/pdf

9512556.pdf (5MB)
(no description provided)PDF

## Description

 Title: Quorum consensus protocols for the client server architecture Author(s): Soufi, Khaled Saadi Doctoral Committee Chair(s): Belford, Geneva G. Department / Program: Computer Science Discipline: Computer Science Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Computer Science Abstract: In a client-server architecture, replicated copies of an object are assigned to different servers (possibly client sites) in order to increase the availability of the database in case some but not all servers fail. The aim of this work is to introduce a new highly efficient, highly reliable quorum consensus protocol, the Quorum Rings (QR) protocol, specifically designed to take advantage of the client-server architecture. We will also introduce an algorithm that modifies existing quorum consensus protocols to work efficiently and reliably with the client-server architecture. The high resiliency of the QR and the modified QC protocols is achieved at a very low cost in communication messages. More specifically, the number of communication messages required for a Read or Write operation is O(1) in normal mode (when there are no failures in the system), and only O($\sqrt{N})$ (for the QR protocol) in failure mode when some but not all servers with replicated objects are faulty. Finally, the QR protocol exhibits the property of graceful degradation--more communication cost is incurred only when the number of failures increases in the system. Issue Date: 1994 Type: Text Language: English URI: http://hdl.handle.net/2142/22382 Rights Information: Copyright 1994 Soufi, Khaled Saadi Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9512556 OCLC Identifier: (UMI)AAI9512556
﻿