distributed

1. Lecture 1: Introduction
Distributed Systems
Lecture 1- Introduction

2. Outline
• Introduction
• Goals of Distributed Systems
• Types of Distributed Systems
2

3. 3
Definition

4. 4
ATM
Examples

5. 5
Workstations
Examples

6. 6
Internet
Examples

7. 7
Examples

8. 8
Parallel vs distributed computing
Related systems

9. 9
Related concepts

10. 10
Prons and cons

11. 11
Design goal

12. 12
Transparency

13. 13
Scalability

14. • Scaling Techniques
• Hiding Communication Latencies
• To achieve geographical scalability
• Asynchronous communication
• Shipping Code
• Distribution
• Distribution involves taking a component, splitting it into smaller parts, and
subsequently spreading those parts across the system.
• An excellent example of distribution is the Internet Domain Name System (DNS).
The DNS name space is hierarchically organized into a tree of domains, which are
divided into nonoverlapping zones.
• Replication
• scalability problems often appear in the form of performance degradation, it is
generally a good idea to actually replicate components across a distributed
system. Replication not only increases availability, but also helps to balance the
load between components leading to better performance.
• Caching: Special forming of replication
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Scalability – scaling techniques

15. 15
Scalability - scaling techniques

16. 16
• Distribution
Scalability - scaling techniques

17. 17
• An open distributed system is a system that offers services according to
standard rules that describe the syntax and semantics of those services
Openness

18. 18
Connecting users and resources

19. 19
Types of distributed systems

20. 20
Distributed computing systems: cluster computing

21. 21
Distributed computing systems: Grid computing

22. 22
Distributed information systems

23. 23
Distributed information systems: transaction processing systems

24. 24
Distributed pervasive systems

25. 25
Distributed pervasive systems: Examples

26. 26
Distributed pervasive systems: Examples

27. 27
Distributed pervasive systems: Example