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1 intro-to-distributed

1 intro-to-distributed - potentially conflicting •...

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Distributed Systems Brief Overview CNT 5517-5564 Mobile Computing Sumi Helal
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Distributed System Values • Reliability • Availability • Dependability • Security • Performance: response time, throughput, etc • Scalability: vertical (concurrency) and horizontal (distribution) Fault-tolerance
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Distributed System Values, cont’d • Consistency • Up-to-date-ness • Adaptability • Reconfigureability • Manageability • Extensibility
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Distributed Systems Intricacies Synchronization : multiple clocks (difficult to agree on exact time) Concurrency : multiple simultaneous accesses
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Unformatted text preview: potentially conflicting. • Failures : high probability of failures (too many components). Complex failure modes (single, multiple simultaneous, network partition, …) • Consensus : difficult to reach consensus (odds includes failures, lack of synchronization, …) • more … Distributed Computing Models • Client/Server Approach • Multi-tier Approach • Peer-to-Peer Approach • Agent based systems • Mobile Code (Applets, mobile agents, . .) • Service-oriented computing – Service registration/discovery – Service composition...
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