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arXiv cs/0611034cs.DC
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树型网络中的节点放置策略

Strategies for Replica Placement in Tree Networks

Yves Robert, Anne Benoit, Veronika Rehn

摘要:

在本文中,我们讨论和比较几种政策,把副本树网络,服务器容量和QoS的限制。客户端请求是事先已知的,而服务器的数量和位置是要确定的。文献中的标准方法是强制客户端的所有请求都由树中最近的服务器提供服务。我们提出并研究了两项新政策。在第一个策略中,来自给定客户端的所有请求仍然由同一服务器处理,但该服务器可以位于从客户端到根路径上的任何位置。在第二种策略中,给定客户端的请求可以由多个服务器处理。本文的一个主要贡献是评估这些新政策对总复制成本的影响。另一个重要的目标是从理论和实践的角度评估服务器异构性的影响。在本文中,我们建立了几个新的复杂性结果,并提供了几个有效的多项式算法的NP完全的情况下的问题。这些proketistics相比,一个绝对的下限所提供的问题的整数线性规划的解决方案的制定。

英文摘要:

In this paper, we discuss and compare several policies to place replicas in tree networks, subject to server capacity and QoS constraints. The client requests are known beforehand, while the number and location of the servers are to be determined. The standard approach in the literature is to enforce that all requests of a client be served by the closest server in the tree. We introduce and study two new policies. In the first policy, all requests from a given client are still processed by the same server, but this server can be located anywhere in the path from the client to the root. In the second policy, the requests of a given client can be processed by multiple servers. One major contribution of this paper is to assess the impact of these new policies on the total replication cost. Another important goal is to assess the impact of server heterogeneity, both from a theoretical and a practical perspective. In this paper, we establish several new complexity results, and provide several efficient polynomial heuristics for NP-complete instances of the problem. These heuristics are compared to an absolute lower bound provided by the formulation of the problem in terms of the solution of an integer linear program.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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