【摘要】：云存儲旨在將企業(yè)和個人從繁重的數(shù)據(jù)存儲工作中分離出來，以“按需付費”的形式向用戶提供簡單而可靠的存儲服務，目前正在受到越來越多的關注。副本技術是保證云存儲中數(shù)據(jù)安全和可靠的關鍵技術之一。云存儲副本技術的研究，對云存儲的發(fā)展和推廣具有重要意義。 本文以開源的HDFS為平臺，分析了云存儲中副本管理的特點和目前存在的問題。針對云存儲中用戶的多變性，，本文給出一種基于文件熱度的動態(tài)副本冗余度策略。該策略綜合文件的歷史訪問信息，通過對不同周期的訪問頻率賦予不同的權(quán)重來計算得到文件的當前熱度值。文件的副本冗余數(shù)以文件的熱度值為依據(jù)，根據(jù)文件熱度值的變化而動態(tài)變化。隨后對副本數(shù)量的最大值和最小值進行了理論分析，提出了依據(jù)用戶的可靠性要求來確定副本數(shù)量的最小值，依據(jù)系統(tǒng)允許的一致性維護開銷確定副本數(shù)量最大值的方法。 針對云存儲中節(jié)點的差異性，本文設計了基于TOPSIS的副本布局策略，將其運用在副本布局策略中以充分利用其在多目標決策上的優(yōu)勢�；赥OPSIS的副本布局策略使用HDFS機架感知的功能，對多個節(jié)點的多個屬性進行綜合評價，通過計算各個節(jié)點到最優(yōu)解和最劣解的“距離”來選擇部署副本的節(jié)點，從而達到副本布局的高效性。
[Abstract]:Cloud storage, which aims to separate enterprises and individuals from heavy data storage work and provide users with simple and reliable storage services in the form of "on-demand payment", is attracting more and more attention. Replica technology is one of the key technologies to ensure data security and reliability in cloud storage. The research of cloud storage replica technology is of great significance to the development and popularization of cloud storage. Based on open source HDFS, this paper analyzes the characteristics and problems of replica management in cloud storage. In view of the variability of users in cloud storage, this paper presents a dynamic replica redundancy strategy based on file heat. The strategy synthesizes the historical access information of the file and gives different weights to the access frequency of different periods to calculate the current heat value of the file. The redundant number of copies is based on the calorific value of the file and changes dynamically according to the change of the calorific value of the document. Then the maximum and minimum replicas are theoretically analyzed and a method is proposed to determine the minimum replica number according to the reliability requirements of the user and the maximum replica number according to the allowable consistency maintenance overhead of the system. Aiming at the differences of nodes in cloud storage, this paper designs a replica layout strategy based on TOPSIS, and applies it to the replica layout strategy to make full use of its advantages in multi-objective decision making. Based on the replica layout strategy of TOPSIS, using the function of HDFS rack awareness, the multiple attributes of multiple nodes are comprehensively evaluated, and the nodes that deploy replica are selected by calculating the "distance" from each node to the optimal solution and the worst solution. In order to achieve the high efficiency of the copy layout.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TP333

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本文編號：2337571