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- W71420216 abstract "Contemporary wide-area distributed systems suggest the promise of tremendous computing power and storage capabilities. One of the key problems in exploiting this power is the lack of support for a wide range of consistency semantics in worldwide dynamic systems. The major challenges to be addressed derive from both the complexity of the applications to be deployed, and the dynamism and scalability of the underlying system. This work explores the thesis that by uniformly defining and treating various consistency semantics, and by combining the advantages of Distributed Hash Table technologies with those of multi-consistency systems, providing support for an entire range of consistency semantics in a global dynamic system becomes feasible. The uniform formal model proposed in this dissertation is used to express consistency semantics, define the contract with the user, and reason about replication algorithms. This common foundation enables the use of different protocols into one consistent replication system---GRACE. GRACE comes with a layered architecture, that helps mitigate the inherent conflict between scalability, availability and consistency, and is suitable for locating the desired replicas in a scalable manner, being based on the Distributed Hash Table technology. Therefore, despite the dynamism of the underlying system, data and routing requests are fault-tolerant, requests for data localize the replica at the desired consistency level, while replica placement and update propagation algorithms rely on scalable mechanisms. Of particular interest is the interaction between the Distributed Hash Table technology and the different consistency semantics. This work investigated the relationship in the context of sequential and eventual consistency semantics. The experiments prove that the consistency protocols proposed are suitable for use in the dynamic wide-area setting, and work well in conjunction with the replica placement algorithms. The major contributions of this work come in the form of providing the desired support for a wide range of consistency semantics that are defined and treated uniformly, proposing scalable and efficient mechanisms for replica placement and location, as well as suitable protocols for sequential and eventual consistency, all in the context of wide-area dynamic systems." @default.
- W71420216 created "2016-06-24" @default.
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- W71420216 date "2005-01-01" @default.
- W71420216 modified "2023-09-27" @default.
- W71420216 title "Global coordination of replicated data in wide-area dynamic systems" @default.
- W71420216 hasPublicationYear "2005" @default.
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