A brief survey on replica consistency in cloud environments

Robson A Campêlo,Marco A Casanova,Dorgival O Guedes,Alberto H F Laender

doi:10.1186/s13174-020-0122-y

Abstract

Cloud computing is a general term that involves delivering hosted services over the Internet. With the accelerated growth of the volume of data used by applications, many organizations have moved their data into cloud servers to provide scalable, reliable and highly available services. A particularly challenging issue that arises in the context of cloud storage systems with geographically-distributed data replication is how to reach a consistent state for all replicas. This survey reviews major aspects related to consistency issues in cloud data storage systems, categorizing recently proposed methods into three categories: (1) fixed consistency methods, (2) configurable consistency methods and (3) consistency monitoring methods.

Highlights

Cloud computing is a general term that includes the idea of delivering hosted services over the Internet
Depending on the kind of resource offered to the users, cloud services tend to be grouped in the following three basic models: Software as a Service (SaaS) [30], Platform as a Service (PaaS) [13] and Infrastructure as a Service (IaaS) [16]
2 Cloud database management we present general concepts related to cloud database management in order to provide a better understanding of the key issues that affect replica consistency in cloud environments

Summary

Introduction

Users acquire computing and storage resources in a pricing model that is known as pay-as-you-go [8]. According to such a model, IT resources are offered in an unlimited way and the payment is made according to the actual resources used for a certain period, to the traditional home utilities model. As an extension of this classification, when the service refers to a database, the model is known as Database as a Service (DBaaS) [27], which is the focus of this survey. Such a model provides transparent mechanisms to create, store, access and update databases. The database service provider takes full responsibility for the database administration, guaranteeing backup, reorganization and version updates

Methods

Findings

Discussion

Conclusion