'Vector timestamps' diaporamas de présentation

DISTRIBUTED COMPUTING

DISTRIBUTED COMPUTING. Sunita Mahajan , Principal, Institute of Computer Science, MET League of Colleges, Mumbai Seema Shah , Principal, Vidyalankar Institute of Technology, Mumbai University. Chapter - 5 Synchronization. Topics. Introduction Clock synchronization Logical clocks

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Distributed Transaction Management

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Logical Clocks

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Reliable Distributed Systems

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CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS. Spring 2014 Prof. Jennifer Welch. p 0. p 0. m 0. m 1. m 0. m 1. p 1. p 1. Logical Clocks Motivation. In an asynchronous system, we often cannot tell which of two events occurred before the other:

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CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS

CSCE 668 DISTRIBUTED ALGORITHMS AND SYSTEMS. Fall 2011 Prof. Jennifer Welch. p 0. p 0. m 0. m 1. m 0. m 1. p 1. p 1. Logical Clocks Motivation. In an asynchronous system, we often cannot tell which of two events occurred before the other:

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Distributed Systems

Distributed Systems. Logical Clocks Paul Krzyzanowski pxk@cs.rutgers.edu ds@pk.org. Except as otherwise noted, the content of this presentation is licensed under the Creative Commons Attribution 2.5 License. Logical clocks. Assign sequence numbers to messages

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Computer Science 425 Distributed Systems CS 425 / CSE 424 / ECE 428 Fall 2011

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Computer Science 425 Distributed Systems

Computer Science 425 Distributed Systems. Lecture 4 Multicast Reading: Section 12.4. Communication Modes in DS. Unicast ( best effort or reliable ) Messages are sent from exactly one process to one process. Best effort guarantees that if a message is delivered it would be intact.

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Time and Clocks

Time and Clocks. uses of time in distributed systems: time-based algorithms (e.g. in security) distributed make gathering event traces for debugging proving or disproving causality (insider trading) common element: need to know in which order events happened. Absolute Time.

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Concurrent events

Concurrent events. If a, b are concurrent, LT(a) and LT(b) may have arbitrary values! Thus, logical time lets us determine that a potentially happened before b , but not that a definitely did so!

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Vector Clocks

Vector Clocks. Each process maintains a vector C of size n, where n is the number of processes in the system. For process i, the i th entry of the vector is the local clock. The other entries represent its best guess of the clock at other processes.

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