Accessing Replicated Data In A Large Scale Distributed System

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Accessing Replicated Data In A Large Scale Distributed System

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Author : Richard Andrew Golding
language : en
Publisher:
Release Date : 1991

Accessing Replicated Data In A Large Scale Distributed System written by Richard Andrew Golding and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Computer network protocols categories.

Abstract: "Replicating a data object improves the availability of the data, and can improve access latency by locating copies of the object near to their use. When accessing replicated objects across an internetwork, the time to access different replicas is non-uniform. Further, the probability that a particular replica is inaccessible is much higher in an internetwork than in a local-area network (LAN) because of partitions and the many intermediate hosts and networks that can fail. We report three replica-accessing algorithms which can be tuned to minimize either access latency or the number of messages sent. These algorithms assume only an unreliable datagram mechanism for communicating with replicas. Our work extends previous investigations into the performance of replication algorithms by assuming unreliable communication. We have investigated the performance of these algorithms by measuring the communication behavior of the Internet, and by building discrete-event simulations based on our measurements. We find that almost all message failures are either transient or due to long-term host failure, so that retrying messages a few times adds only a small amount to the overall message traffic while improving both access latency as long as the probability of message failure is small. Moreover, the algorithms which retry messages on failure provide significantly improved availability over those which do not."

Management Of Replicated Data In Large Scale Systems

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Author : Noha Adly
language : en
Publisher:
Release Date : 1995

Management Of Replicated Data In Large Scale Systems written by Noha Adly and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Database management categories.

Second Workshop On The Management Of Replicated Data November 12 13 1992 Monterey California

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Author : Jehan-François Pâris
language : en
Publisher:
Release Date : 1992

Second Workshop On The Management Of Replicated Data November 12 13 1992 Monterey California written by Jehan-François Pâris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Computers categories.

Weak Consistency Group Communication And Membership

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Author : Richard Andrew Golding
language : en
Publisher:
Release Date : 1992

Weak Consistency Group Communication And Membership written by Richard Andrew Golding and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Computer networks categories.

Abstract: "Many distributed systems for wide-area networks can be built conveniently, and operate efficiently and correctly, using a weak consistency group communication mechanism. This mechanism organizes a set of principals into a single logical entity, and provides methods to multicast messages to the members. A weak consistency distributed system allows the principals in the group to differ on the value of shared state at any given instant, as long as they will eventually converge to a single, consistent value. A group containing many principals and using weak consistency can provide the reliability, performance, and scalability necessary for wide-area systems. I have developed a framework for constructing group communication systems, for classifying existing distributed system tools, and for constructing and reasoning about a particular group communication model. It has four components: message delivery, message ordering, group membership, and the application. Each component may have a different implementation, so that the group mechanism can be tailored to application requirements. The framework supports a new message delivery protocol, called timestamped anti-entropy, which provides reliable, eventual message delivery; is efficient; and tolerates most transient processor and network failures. It can be combined with message ordering implementations that provide ordering guarantees ranging from unordered to total, causal delivery. A new group membership protocol completes the set, providing temporarily inconsistent membership views resilient to up to k simultaneous principal failures. The Refdbms distributed bibliographic database system, which has been constructed using this framework, is used as an example. Refdbms databases can be replicated on many different sites, using the group communication system described here."

The Performance Of Weak Consistency Replication Protocols

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Author : Richard Golding
language : en
Publisher:
Release Date : 1992

The Performance Of Weak Consistency Replication Protocols written by Richard Golding and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Computer network protocols categories.

Abstract: "Weak-consistency replication protocols can be used to build wide-area services that are scalable, fault-tolerant, and useful for mobile computer systems. We have developed the timestamped anti-entropy protocol, which provides reliable eventual delivery with a variety of message orderings. Pairs of replicas periodically exchange update messages; in this way updates eventually propagate to all replicas. In this paper we present a detailed analysis of the fault tolerance and the consistency provided by this protocol. The protocol is extremely robust in the face of site and network failure, and it scales well to large numbers of replicas."

Proceedings Of The Twenty Sixth International Symposium On Fault Tolerant Computing

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Author :
language : en
Publisher:
Release Date : 1996

Proceedings Of The Twenty Sixth International Symposium On Fault Tolerant Computing written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Electronic digital computers categories.

Foundations Of Data Organization And Algorithms

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Author :
language : en
Publisher:
Release Date : 1993

Foundations Of Data Organization And Algorithms written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Algorithms categories.

A Weak Consistency Architecture For Distributed Information Services

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Author : Richard Golding
language : en
Publisher:
Release Date : 1992

A Weak Consistency Architecture For Distributed Information Services written by Richard Golding and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Internet categories.

Abstract: "Services provided on wide-area networks like the Internet present several challenges. The reliability, performance, and scalability expected of such services often requires they be implemented using multiple, replicated servers. One possible architecture implements the replicas as a weak-consistency process group. This architecture provides good scalability and availability, handles portable computer systems, and minimizes the effect of users on each other. The key principles in this architecture are component independence, a process group protocol that provides small summaries of database contents, caching database slices, and the quorum multicast client-to-server communication protocol. A distributed bibliographic database system serves as an example."

Mascots 93

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Author : Herbert D. Schwetman
language : en
Publisher: Society for Computer Simulation International
Release Date : 1993

Mascots 93 written by Herbert D. Schwetman and has been published by Society for Computer Simulation International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Computers categories.

Proceedings Of The International Conference On Parallel And Distributed Information Systems

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Author :
language : en
Publisher:
Release Date : 1996

Proceedings Of The International Conference On Parallel And Distributed Information Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Distributed databases categories.