'0 valent' diaporamas de présentation

IS 698/800-01: Advanced Distributed Systems Crash Fault Tolerance

IS 698/800-01: Advanced Distributed Systems Crash Fault Tolerance. Sisi Duan Assistant Professor Information Systems sduan@umbc.edu. Outline. A brief history of consensus Paxos Raft. A brief history of consensus.

701 views • 70 slides

When Is Agreement Possible? CS 188 Distributed Systems February 24, 2015

When Is Agreement Possible? CS 188 Distributed Systems February 24, 2015. Introduction. Basics of agreement protocols Impossibility of agreement in asynchronous system with failures When is agreement possible?. Basics of Agreement Protocols. What is agreement?

456 views • 45 slides

Impossibility of Distributed Consensus with One Faulty Process

503 views • 27 slides

Fault-Tolerant Consensus

Fault-Tolerant Consensus. Slides provided by Prof. Jennifer Welch. Processor Failures in Message Passing. Crash: at some point the processor stops taking steps at the processor's final step, it might succeed in sending only a subset of the messages it is supposed to send

385 views • 26 slides

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS. Fall 2011 Prof. Jennifer Welch. Processor Failures in Message Passing. Crash: at some point the processor stops taking steps at the processor's final step, it might succeed in sending only a subset of the messages it is supposed to send

396 views • 26 slides

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS. Spring 2014 Prof. Jennifer Welch. Processor Failures in Message Passing. Crash: at some point the processor stops taking steps at the processor's final step, it might succeed in sending only a subset of the messages it is supposed to send

263 views • 26 slides

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS. Fall 2011 Prof. Jennifer Welch. Processor Failures in Message Passing. Crash: at some point the processor stops taking steps at the processor's final step, it might succeed in sending only a subset of the messages it is supposed to send

265 views • 26 slides

Consensus in an Asynchronous System

Consensus in an Asynchronous System. Impossible to achieve! even a single failed process is enough to avoid the system from reaching agreement Proved in a now-famous result by Fischer, Lynch and Patterson, 1983 (FLP). Recall. Each process p has a state

352 views • 22 slides

Consensus and Its Impossibility in Asynchronous Systems

Consensus and Its Impossibility in Asynchronous Systems. A Few Questions from Protocols We studied. Was it necessary to assume that a node can detect failure of other nodes? What if we could not do that in a system? E.g., if delays are arbitrarily long

357 views • 21 slides