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Efficient and Modular Consensus-Free Reconfiguration for Fault-Tolerant Storage

Authors Eduardo Alchieri, Alysson Bessani, Fabíola Greve, Joni da Silva Fraga

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Eduardo Alchieri
Alysson Bessani
Fabíola Greve
Joni da Silva Fraga

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Eduardo Alchieri, Alysson Bessani, Fabíola Greve, and Joni da Silva Fraga. Efficient and Modular Consensus-Free Reconfiguration for Fault-Tolerant Storage. In 21st International Conference on Principles of Distributed Systems (OPODIS 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 95, pp. 26:1-26:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018) https://doi.org/10.4230/LIPIcs.OPODIS.2017.26

Abstract

Quorum systems are useful tools for implementing consistent and available storage in the presence of failures. These systems usually comprise of a static set of servers that provide a fault-tolerant read/write register accessed by a set of clients. We consider a dynamic variant of these systems and propose FreeStore, a set of fault-tolerant protocols that emulates a register in dynamic asynchronous systems in which processes are able to join/leave the set of servers during the execution. These protocols use a new abstraction called view generators, that captures the agreement requirements of reconfiguration and can be implemented in different system models with different properties. Particularly interesting, we present a reconfiguration protocol that is modular, efficient, consensus-free and loosely coupled with read/write protocols. An analysis and an experimental evaluation show that the proposed protocols improve the overall system performance when compared with previous solutions.

Subject Classification

Keywords
  • Distributed Systems
  • Reconfiguration
  • Fault-Tolerant Quorum Systems

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