Lecture notes distributed computing

2004

This manuscript aims at offering an introductory description of distributed programming abstractions and of the algorithms that are used to implement them in different distributed environments. The reader is provided with an insight on important problems in distributed computing, knowledge about the main algorithmic techniques that can be used to solve these problems, and examples of how to apply these techniques when building distributed applications.

1996

PRINCIPLES OF DISTRIBUTED SYSTEMS 2.4 Ricart and Agrawala's Algorithm 2.5 Centralized Algorithm 2.6 Dijkstra's Self-stabilizing Algorithm 2.7 Exercises 2.8 Bibliographic Remarks Chapter 2 2.1 Problem with the simple centralized mutual exclusion algorithm 2.2 The Algorithm for Active Vector at process i 2.3 Proof for the induction case 2.4 Lamport's Algorithm for Mutual Exclusion 2.5 Ricart and Agrawala's Algorithm 2.6 Proof for the Ricart and Agrawala's Algorithm 2.7 Algorithm for Client Processes 2.8 Algorithm for the coordinator process 66 xi xii PRINCIPLES OF DISTRIBUTED SYSTEMS Chapter 3 3.1 Consistent and inconsistent cuts 72 3.2 Snapshot algorithm for recording local states 75 3.3 Chandy and Lamport's Snapshot Algorithm 78 3.4 Prooffor Safety 78 3.5 An Algorithm for Snapshots when channels are non-FIFO. 80 Chapter 4 4.1 Example of a Non-Linear Predicate 91 4.2 An efficient algorithm to detect a linear predicate 91 Chapter 5 List of Figures xiii 6.6 Using a queue insert graph to find the output queue 6.7 Function FindQ that finds the output queue to insert an element 6.8 Algorithm for the Adversary 6.9 Converting Deposets into Flow Graphs 163 Chapter' 7.1 Computations with the strong predicate flagl " flag2 true. 7.2 I(z) and first(z) 7.3 Illustration of the proof of strong conjunctive predicates Chapter 8 8.1 State machine implementing a + cb*c Chapter 9 9.1 A FIFO computation that is not causally ordered 9.2 A computation that is not synchronously ordered 9.3 A computation that is synchronously ordered 9.4 Algorithm for FIFO ordering 9.5 Algorithm for causal ordering 9.6 Inconsistent Memory State 201 9.7 Time Diagrams under Synchronous Message Passing 9.8 Crowns of size 2 and 3 203 9.9 commit and commit reply Messages 9.10 Algorithm to Implement Synchronous Ordering of Messages Chapter 10 10.1 A message sequence for repeated computation of a function 10.2 Overlapping trees that determine message sequences 10.3 The function nezt 10.4 Node groups and transitions 10.5 Node labels generated by next 10.6 Physical connectivity required based on two-step routing 10.7 The function snezt 10.8 Message Sequences Generated by snext 10.9 Message sequence generated by bcnext xiv PRINCIPLES OF DISTRIBUTED SYSTEMS 10.10 The function bcnezt 10.11 Distributed branch and bound 10.12 Asynchronous computation of a fixed point 239 244 PREFACE The book is designed for a graduate level course on distributed systems. Several examples and exercise problems are included in each chapter to facilitate classroom teaching. Our treatment is based on the graduate courses given at The University of Texas at Austin. Preface xvii I thank the Department of Electrical and Computer Engineering at The University of Texas at Austin where I was given the opportunity to develop and teach courses on distributed systems. I was supported in part by a grant from the National Science Foundation, a lRW faculty assistantship, an IBM grant, and a General Motors Centennial fellowship. I also thank Alex Greene at Kluwer Academic Publishers for his help. Finally, I thank my wife Meenakshi whose love, support, and understanding kept me inspired in accomplishing this goal. Vijay K. Garg • Low cost: Availability of high bandwidth network and inexpensive workstations also favors distributed computing for economic reasons.

ACM SIGACT News, 2005

The Distributed Computing Column covers the theory of systems that are composed of a number of interacting computing elements. These include problems of communication and networking, databases, distributed shared memory, multiprocessor architectures, operating systems, verification, Internet, and the Web. This issue consists of:

Distributed computer systems have been the subject of a vast amount of research. Many prototype distributed computer systems have been built at university, industrial, commercial, and government research laboratories, and production systems of all sizes and types have proliferated. It is impossible to survey all distributed computing system research. Instead, this paper identifies six fundamental distributed computer system research issues, points out open research problems in these areas, and describes how these six issues and solutions to problems associated with them transect the communications subnet, the distributed operating system, and the distributed database areas. It is intended that this perspective on distributed computer system research serve as a form of survey, but more importantly to illustrate and encourage a better integration and exchange of ideas from various subareas of distributed computer system research.

IOSR Journal of Computer Engineering, 2014

In recent years, distributed computing systems has been widely explored in order to improve system performance in terms of scalability and reliability.A distributed computing system allows the user to share, select, and aggregate the distributed heterogeneous computational and storage resources, which are under the control of different sites or networks. A distributed system also provides solutions to the complex scientific or engineering problems, such as weather forecasting, medical diagnoses, and stock portfolio management. However, the distributed nature of the system also raises some serious challenges. This paper covers the major challenges of security& design.However, complete distributed nature of the system raises serious challenges in domains of security like Scheduling,Objective Function,Security and Trust and also in domain of design like Heterogeneity,Openness,Reliability and Fault Tolerance, etcIn this paper, we aim to identify the challenges of distributed systems.

2020

Distributed computing is an evolving trends in computing where clients can access their applications from anyplace through their internet enable gadgets where user friendly interface is developed to support the applications straightforward to clients. The applications lived in greatly versatile servers where resources can be progressively provided and shared to accomplish huge task of operations. A solid management results in close to zero administration costs when more IT assets are added to the cloud. The expansion and increasing of technological gadgets (smart phones and laptops and tablets), fast internet connectivity, has made the distributed computing model reasonable as well as decreased IT sophistication. Starting from the development of server and taking advantage of multi-nodal online information management and program handling execution. As organizations effectively seek after proficiency and cost decrease all through their frameworks and operational structure, the inborn...

2013

I certify that except where due acknowledgement has been given, the work pre-sented in this thesis is that of the author alone; the work has not been submitted previously, in whole or in part, to qualify for any other academic award; and the con-tent of the thesis is the result of work which has been carried out since the official commencement date of the approved research program.

The paper describes basic operations associated with the use of the distributed computing toolbox and its application for processing of extensive and complex mathematical problems using the computer network and the set of computers for parallel processing of separate components of the whole algorithm.

2012

The Doctoral Workshop on Distributed Systems has been held at La Vue-des-Alpes, Switzerland, from July 4-6, 2012. Ph.D. students from the Universities of Neuchâtel and Bern as well as the University of Applied Sciences of Fribourg presented their current research work and discussed recent research results. This technical report includes the extended abstracts of each talk given during the workshop.

Future Generation Computer Systems, 2008