基于分层的P2P存储系统冗余策略研究

发布时间：2018-02-02 14:13

本文关键词： P2P存储分层策略冗余策略 JXTA　出处：《华中科技大学》2012年硕士论文　论文类型：学位论文

【摘要】：P2P存储系统以P2P网络为底层架构基础，充分利用P2P网络的优势对节点进行组织，从而可以较好的利用节点的空闲计算能力和网络带宽资源，使得P2P存储系统具有高可用性、高数据吞吐率、高扩展性等优势。相比以往P2P存储系统，提出考虑节点间性能的差异以及这种差异对P2P存储系统的影响，不再从整体上对节点进行统一的组织；同时，研究不同节点层次上最适合的冗余策略以提供最优的节点可用性。在节点组织方面，提出层次化组织的概念，通过在线向量粒度的刻画P2P网络节点的动态性，在此基础上提出节点相似度的概念来衡量节点在线相似情况，以此来选取最适合某一节点数据存储请求的最佳的存储节点集合。在层次化组织节点的基础上，动态的考虑不同节点层次上最佳的冗余策略，即不再为P2P存储系统提供统一的冗余策略，，转而根据此节点层次的可用性特征来动态的选取冗余策略。同时，提出了副本纠删码相融合和二次纠删码的冗余策略，并进行了其所能提供的数据可用性的初步分析。设计实现了一个基于JXTA的P2P存储系统，以其为实验平台验证了P2P存储系统中分层策略的优势，对比了副本与纠删码模式在不同节点层次上所能提供的系统可用性从而验证了根据节点层次的不同动态的选取冗余策略的有效性。
[Abstract]:P2P storage system is based on P2P network, which makes full use of the advantages of P2P network to organize nodes, so as to make good use of the idle computing power of nodes and network bandwidth resources. P2P storage system has high availability, high data throughput, high scalability and other advantages. Compared with the previous P2P storage system. Considering the difference of performance between nodes and the influence of the difference on P2P storage system, the organization of nodes is not unified on the whole. At the same time, the optimal redundancy strategy at different node levels is studied to provide optimal node availability. In the aspect of node organization, the concept of hierarchical organization is put forward, and the dynamic characteristics of P2P network nodes are described by on-line vector granularity. On this basis, the concept of node similarity is proposed to measure the online similarity of nodes. In order to select the best set of storage nodes which is most suitable for a node data storage request. On the basis of hierarchical organization of nodes, dynamically consider the best redundancy strategy at different node levels. That is not to provide a unified redundancy policy for P2P storage system, but to dynamically select redundant strategy according to the usability characteristics of this node level. At the same time. A redundancy strategy of duplicate erasure code fusion and quadratic erasure code is proposed and the availability of data provided by it is analyzed preliminarily. A P2P storage system based on JXTA is designed and implemented, which is used as an experimental platform to verify the advantage of layered strategy in P2P storage system. The system availability of replica and erasure code at different node levels is compared to verify the effectiveness of selecting redundancy policies according to different dynamic nodes.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TP333;TP393.02

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