'Anti entropy' diaporamas de présentation

CS 552 Peer 2 Peer Networking

CS 552 Peer 2 Peer Networking. R. Martin Credit slides from B. Richardson, I. Stoica, M. Cuenca. Peer to Peer. Outline Overview Systems: Gnutella Freenet Chord PlanetP. Why Study P2P. Huge fraction of traffic on networks today >=50%! Exciting new applications

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Epidemics

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Topics in Database Systems: Data Management in Peer-to-Peer Systems

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Epidemic Techniques

Epidemic Techniques. Chiu Wah So (Kelvin). Database Replication. Why do we replicate database? Low latency High availability To achieve strong (sequential) consistency on replicated database. Not scalable. One primary database Quorum system (contact over half of replicas).

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Epidemic Techniques

Epidemic Techniques. Algorithms and Implementations. Agenda. Consistency issues Epidemic algorithms Astrolabe Conclusion. Databases replicated at many sites need to maintain consistency. Relaxed consistency problem: Database is changed at one site

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CS 525 Advanced Distributed Systems Spring 09

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Computer Science 425 Distributed Systems (Fall 2009)

Computer Science 425 Distributed Systems (Fall 2009). Lecture 24 Transactions with Replication Reading: Section 15.5 Klara Nahrstedt. Acknowledgement. The slides during this semester are based on ideas and material from the following sources:

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Mobility

Mobility. Presented by: Mohamed Elhawary. Mobility. Distributed file systems increase availability Remote failures may cause serious troubles Server replication (higher quality) Client replication, inferior, needs periodic revalidation

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Epidemic Algorithms for replicated Database maintenance

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Announcements

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Announcements

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G22.3250-001

G22.3250-001. Bayou: A Weakly Connected Replicated Storage System. Robert Grimm New York University. Altogether Now: The Three Questions. What is the problem? What is new or different? What are the contributions and limitations?. Bayou from High Above. A replicated storage system

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Gossip Protocols from Epidemic Algorithms for Replicated Database Maintenance , Alan Demers et al

Gossip Protocols from Epidemic Algorithms for Replicated Database Maintenance , Alan Demers et al. Russell Greenspan CS523 Spring, 2006. Gossip Protocols. Useful for routing information through an unreliable network Great for replicating database updates from one site to many

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Outline

Outline. Epidemic Algorithms for replicated database maintenance Alan Demers , Dan Greene, Carl Hauser , Wes Irish, John Larson, Scott Shenker, Howard Sturgis, Dan Swinehart, and Doug Terry . In Proceedings of the Sixth Annual ACM Symposium on Principles of Distributed Computing

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