On the reliability of Web clusters with partial replication of contents

José Daniel García Sánchez, J. Carretero, Javier Fernández, Félix García, D. E. Singh, A. Calderón
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引用次数: 7

Abstract

Traditionally, distributed Web servers have used two strategies for allocating files on server nodes: full replication and full distribution. While full replication provides a highly reliable solution, it limits storage capacity to the capacity of the smallest node. On the other hand, full distribution provides higher storage capacity at the cost of lower reliability. A hybrid solution is partial replication where every file is allocated to a small number of nodes. The most promising architecture for a partial replication strategy is the Web cluster architecture. However, Web clusters present a big flaw from reliability perspective as they contain a single point of failure. To correct this flaw, in this paper we present a modified architecture: the Web cluster with distributed Web switch. Reliability of Web clusters is evaluated for different replication strategies. System evaluations show that our proposal leads to a highly reliable solution with high scalability.
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关于内容部分复制的Web集群的可靠性
传统上,分布式Web服务器使用两种策略在服务器节点上分配文件:完全复制和完全分发。虽然完全复制提供了高可靠性的解决方案,但它将存储容量限制为最小节点的容量。另一方面,全分布以较低的可靠性为代价提供了较高的存储容量。混合解决方案是部分复制,其中将每个文件分配给少量节点。对于部分复制策略来说,最有前途的体系结构是Web集群体系结构。然而,从可靠性的角度来看,Web集群存在一个很大的缺陷,因为它们包含单点故障。为了纠正这一缺陷,本文提出了一种改进的架构:带有分布式Web交换机的Web集群。对不同复制策略下Web集群的可靠性进行了评估。系统评估表明,我们的方案具有高可靠性和高可扩展性。
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