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Dual-Quorum: A Highly Available and Consistent Replication System for

Summary: Dual-Quorum: A Highly Available and
Consistent Replication System for
Edge Services
Lei Gao, Mike Dahlin, Senior Member, IEEE, Jiandan Zheng, Member, IEEE,
Lorenzo Alvisi, Senior Member, IEEE, and Arun Iyengar, Senior Member, IEEE
Abstract--This paper introduces dual-quorum replication, a novel data replication algorithm designed to support Internet edge
services. Edge services allow clients to access Internet services via distributed edge servers that operate on a shared collection of
underlying data. Although it is generally difficult to share data while providing high availability, good performance, and strong
consistency, replication algorithms designed for specific access patterns can offer nearly ideal trade-offs among these metrics. In this
paper, we focus on the key problem of sharing read/write data objects across a collection of edge servers when the references to each
object 1) tend not to exhibit high concurrency across multiple nodes and 2) tend to exhibit bursts of read-dominated or write-dominated
behavior. Dual-quorum replication combines volume leases and quorum-based techniques to achieve excellent availability, response
time, and consistency for such workloads. In particular, through both analytical and experimental evaluations, we show that the
dual-quorum protocol can (for the workloads of interest) approach the optimal performance and availability of Read-One/Write-All-
Asynchronously (ROWA-A) epidemic algorithms without suffering the weak consistency guarantees and resulting design complexity
inherent in ROWA-A systems.
Index Terms--Reliability, availability, serviceability, performance, distributed system, leases, volume leases, client-server and
multitier systems, data replication, quorum system.



Source: Alvisi, Lorenzo - Department of Computer Sciences, University of Texas at Austin


Collections: Computer Technologies and Information Sciences