'Asynchronous system' diaporamas de présentation

CS4231 Parallel and Distributed Algorithms AY 2006/2007 Semester 2

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Asynchronous Systems

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Failures and Consensus

Failures and Consensus. Coordination. If the solution to availability and scalability is to decentralize and replicate functions and data, how do we coordinate the nodes? data consistency update propagation mutual exclusion consistent global states group membership group communication

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Consensus

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Failure Detection

Failure Detection. The ping- a ck failure detector in a synchronous system satisfies A: completeness B: a ccuracy C: n either D: both. Failure Detection. The ping- a ck failure detector in an asynchronous system satisfies A: c ompleteness B: a ccuracy C: n either D: both.

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CS 775/875: Fall 2000

CS 775/875: Fall 2000. Chapter 14: Replication. Why Data Replication?. Performance enhancements Increased availability Fault tolerance (related to correctness) Issue: Replication transparency, consistencey. System Model. Asynchronous system Fail-stop failures only

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ITEC452 Distributed Computing Lecture 10 Coordination Algorithms

Hwajung Lee. ITEC452 Distributed Computing Lecture 10 Coordination Algorithms. Leader Election. Let G = (V,E) define the network topology. Each process i has a variable L(i) that defines the leader . ? i,j ? V ? i,j are non-faulty :: L(i) ? V and

333 views • 16 slides