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The book presents various state-of-the-art approaches for process synchronization in a distributed environment. The range of algorithms discussed in the book starts from token based mutual exclusion algorithms that work on tree based topology. Then there are interesting solutions for more flexible logical topology like a directed graph, with or without cycle. In a completely different approach, one of the chapters presents two recent voting-based DME algorithms. All DME algorithms presented in the book aim to ensure fairness in terms of first come first serve (FCFS) order among equal priority processes. At the same time, the solutions consider the priority of the requesting processes and allocate resource for the earliest request when no such request from a higher priority process is pending.
The performance of concurrency control algorithms is explored in the context of pessimistic distributed mutual exclusion algorithms. A detailed model of the underlying asynchronous distributed system and its parameters are defined for fail-free systems and systems where processes may fail. New performance metrics are proposed as a means to measure the efficiency of distributed mutual exclusion algorithms. A model of distributed mutual exclusion algorithms and analytical approximations of their performance are developed. Simulation results of five selected distributed mutual exclusion algorithms on fully-connected, star and ring topologies are cataloged. Finally, simulation results of four selected distributed mutual exclusion algorithms on a fully-connected topology where processes may fail are cataloged. Conclusions are drawn as to which algorithm is most appropriate for particular environments. (kr).
The major objective of a distributed system is to provide low coast availability of the resources of the system by localizing access and providing insulation against failures of individual components. Since many users can be concurrently accessing the system, it is essential that a distributed system also provide a high degree of concurrency. Research into algorithms has been focused on concurrency, consistency, failure detection, management of replicated copy, and commitment and termination of transactions. This book is a compilation of a subset of research contributions in the area of concurrency control and reliability in distributed systems, with brief explorations of interesting areas, including theoretical and experimental efforts.
Replication Techniques in Distributed Systems organizes and surveys the spectrum of replication protocols and systems that achieve high availability by replicating entities in failure-prone distributed computing environments. The entities discussed in this book vary from passive untyped data objects, to typed and complex objects, to processes and messages. Replication Techniques in Distributed Systems contains definitions and introductory material suitable for a beginner, theoretical foundations and algorithms, an annotated bibliography of commercial and experimental prototype systems, as well as short guides to recommended further readings in specialized subtopics. This book can be used as recommended or required reading in graduate courses in academia, as well as a handbook for designers and implementors of systems that must deal with replication issues in distributed systems.
DISC, the International Symposium on Distributed Computing, is an annual conference for the presentation of research on the theory, design, analysis, implementation, and application of distributed systems and network. DISC 2004 was held on October 4-7, 2004, in Amsterdam, The Netherlands. There were 142 papers submitted to DISC this year. These were read and evaluated by the program committee members, assisted by external reviewers. The quality of submissions was high and we were unable to accept many dese- ing papers. Thirty one papers were selected at the program committee meeting in Lausanne to be included in these proceedings. The proceedings include an extended abstract of the invited talk by Ueli Maurer. In addition, they include a eulogy for Peter Ruzicka by Shmuel Zaks. The Best Student Paper Award was split and given to two papers: the paper “Efficient Adaptive Collect Using Randomization”, co-authored by Hagit Attiya, Fabian Kuhn, Mirjam Wattenhofer and Roger Wattenhofer, and the paper “Coupling and Self-stabilization”,co-authored by Laurent Fribourg, Stephane Messika and Claudine Picaronny. The support of the CWI and EPFL is gratefully acknowledged. The review process and the preparation of this volume were done using CyberChairPRO. I also thank Sebastien Baehni and Sidath Handurukande for their crucial help with these matters. August 2004 Rachid Guerraoui Peter Ruzicka 1947-2003 Peter died on Sunday, October 5, 2003, at the age of 56, after a short disease. He was a Professor of Informatics at the Faculty of Mathematics, Physics and Informatics in Comenius University, Bratislava, Slovakia. Those of us who knew him through DISC and other occasions mourn his death and cherish his memory
Explains fault tolerance in clear terms, with concrete examples drawn from real-world settings Highly practical focus aimed at building "mission-critical" networked applications that remain secure
This book is a celebration of Leslie Lamport's work on concurrency, interwoven in four-and-a-half decades of an evolving industry: from the introduction of the first personal computer to an era when parallel and distributed multiprocessors are abundant. His works lay formal foundations for concurrent computations executed by interconnected computers. Some of the algorithms have become standard engineering practice for fault tolerant distributed computing – distributed systems that continue to function correctly despite failures of individual components. He also developed a substantial body of work on the formal specification and verification of concurrent systems, and has contributed to the development of automated tools applying these methods. Part I consists of technical chapters of the book and a biography. The technical chapters of this book present a retrospective on Lamport's original ideas from experts in the field. Through this lens, it portrays their long-lasting impact. The chapters cover timeless notions Lamport introduced: the Bakery algorithm, atomic shared registers and sequential consistency; causality and logical time; Byzantine Agreement; state machine replication and Paxos; temporal logic of actions (TLA). The professional biography tells of Lamport's career, providing the context in which his work arose and broke new grounds, and discusses LaTeX – perhaps Lamport’s most influential contribution outside the field of concurrency. This chapter gives a voice to the people behind the achievements, notably Lamport himself, and additionally the colleagues around him, who inspired, collaborated, and helped him drive worldwide impact. Part II consists of a selection of Leslie Lamport's most influential papers. This book touches on a lifetime of contributions by Leslie Lamport to the field of concurrency and on the extensive influence he had on people working in the field. It will be of value to historians of science, and to researchers and students who work in the area of concurrency and who are interested to read about the work of one of the most influential researchers in this field.