【摘要】：目前，我國(guó)傳統(tǒng)農(nóng)業(yè)正在向現(xiàn)代化農(nóng)業(yè)、數(shù)字化農(nóng)業(yè)和信息化農(nóng)業(yè)轉(zhuǎn)變。《2006—2020國(guó)家信息化發(fā)展戰(zhàn)略》指出：“重點(diǎn)建設(shè)農(nóng)村重要信息系統(tǒng)，增強(qiáng)信息資源共享服務(wù)能力�！彪S著我國(guó)農(nóng)業(yè)信息化建設(shè)的不斷深入，全國(guó)各個(gè)地區(qū)紛紛建立起自己網(wǎng)站和農(nóng)業(yè)信息服務(wù)站。各類(lèi)農(nóng)業(yè)數(shù)據(jù)資源呈現(xiàn)爆炸式增長(zhǎng)，并且具有多元化、異構(gòu)化的特點(diǎn)。目前，我們可以通過(guò)購(gòu)置高端的昂貴的存儲(chǔ)器和服務(wù)器來(lái)管理這些數(shù)據(jù)；然而，將來(lái)會(huì)出現(xiàn)沒(méi)有一臺(tái)單獨(dú)的設(shè)備能夠存儲(chǔ)這么多數(shù)據(jù)的局面。另外，由于農(nóng)業(yè)數(shù)據(jù)涉及領(lǐng)域較多，區(qū)域性強(qiáng)、季節(jié)性強(qiáng)，我國(guó)農(nóng)業(yè)信息資源分布在不同區(qū)域的PC機(jī)、服務(wù)器和數(shù)據(jù)存儲(chǔ)設(shè)備上，各個(gè)地區(qū)之間缺少聯(lián)系，使得各種農(nóng)業(yè)信息資源獨(dú)立存在，形成一個(gè)個(gè)的“信息孤島”，共享性較差。如何解決農(nóng)業(yè)信息化過(guò)程中農(nóng)業(yè)數(shù)據(jù)存儲(chǔ)的瓶頸問(wèn)題，是當(dāng)前農(nóng)業(yè)信息化過(guò)程中要研究的主要內(nèi)容。 論文闡述了研究農(nóng)業(yè)數(shù)據(jù)云存儲(chǔ)的目的和意義，，并對(duì)國(guó)內(nèi)外云存儲(chǔ)在農(nóng)業(yè)方面的應(yīng)用做了總結(jié)。然后比較了幾種文件系統(tǒng)的特點(diǎn)，最終確定借鑒HDFS文件系統(tǒng)設(shè)計(jì)了分布式文件系統(tǒng)。分布式文件系統(tǒng)主要采用了文件備份、負(fù)載均衡和并發(fā)控制這三種技術(shù)。通過(guò)研究如何對(duì)文件復(fù)制形成多個(gè)副本，并存儲(chǔ)在不同的設(shè)備上，實(shí)現(xiàn)了數(shù)據(jù)的冗余，使得系統(tǒng)更加安全可靠，避免了因?yàn)槟撑_(tái)機(jī)器的故障造成文件無(wú)法訪問(wèn)的現(xiàn)象，并為負(fù)載均衡提供實(shí)現(xiàn)基礎(chǔ)；通過(guò)研究對(duì)用戶上傳下載文件有效均衡的管理，使文件在各個(gè)節(jié)點(diǎn)上的存儲(chǔ)較為均衡，實(shí)現(xiàn)用戶對(duì)文件的訪問(wèn)有效地分流到不同的節(jié)點(diǎn)上，從而提高了系統(tǒng)性能；通過(guò)研究文件傳輸?shù)牟l(fā)性和遠(yuǎn)程調(diào)用的并發(fā)性，實(shí)現(xiàn)了云存儲(chǔ)系統(tǒng)的并發(fā)控制。在此基礎(chǔ)上，基于分布式文件系統(tǒng)，設(shè)計(jì)并研發(fā)了農(nóng)業(yè)數(shù)據(jù)的云存儲(chǔ)系統(tǒng)。系統(tǒng)用Java來(lái)開(kāi)發(fā)，用Oracle數(shù)據(jù)庫(kù)來(lái)存儲(chǔ)數(shù)據(jù)，通過(guò)調(diào)用分布式文件系統(tǒng)提供的接口，實(shí)現(xiàn)了農(nóng)業(yè)文件數(shù)據(jù)操作的各個(gè)功能和對(duì)系統(tǒng)的管理功能，實(shí)現(xiàn)了農(nóng)業(yè)文件數(shù)據(jù)資源按照統(tǒng)一標(biāo)準(zhǔn)的存儲(chǔ)和檢索，解決了大量農(nóng)業(yè)文件數(shù)據(jù)資源分散和共享性差的問(wèn)題。在技術(shù)上，本文將云存儲(chǔ)技術(shù)用到農(nóng)業(yè)數(shù)據(jù)管理上，是較為新穎的。
[Abstract]:At present, the traditional agriculture of our country is changing to modern agriculture, digital agriculture and information agriculture. The National Informatization Development Strategy 2006-2020 points out: "it is important to construct the important information system in rural areas and to enhance the ability of information resources sharing and service." With the development of agricultural information construction in China, all regions have established their own websites and agricultural information service stations. All kinds of agricultural data resources show explosive growth, and have the characteristics of diversification and isomerization. At present, we can manage this data by purchasing high-end and expensive storage and servers; however, no single device will be able to store so much data in the future. In addition, agricultural information resources are distributed on PC machines, servers and data storage devices in different regions because of the large number of agricultural data, strong regional and seasonal, and lack of connection between different regions. All kinds of agricultural information resources exist independently, forming one by one "information isolated islands", the sharing is poor. How to solve the bottleneck problem of agricultural data storage in the process of agricultural informatization is the main content to be studied in the process of agricultural informatization. The purpose and significance of research on cloud storage of agricultural data are expounded, and the application of cloud storage in agriculture at home and abroad is summarized. Then the characteristics of several file systems are compared and the distributed file system is designed based on the HDFS file system. The distributed file system mainly adopts three technologies: file backup, load balance and concurrency control. By studying how to make multiple copies of files and store them on different devices, the redundancy of data is realized, which makes the system more secure and reliable, and avoids the phenomenon that the files cannot be accessed because of the failure of a machine. And provides the realization foundation for the load balancing; By studying the effective and balanced management of users uploading and downloading files, the storage of files on each node is more balanced, and users' access to files is effectively diverted to different nodes, thus improving the performance of the system. By studying the concurrency of file transfer and remote call, the concurrency control of cloud storage system is realized. Based on the distributed file system, a cloud storage system for agricultural data is designed and developed. The system is developed by Java and stored by Oracle database. By calling the interface provided by the distributed file system, the functions of agricultural file data operation and the management function of the system are realized. The storage and retrieval of agricultural file data resources according to unified standards are realized, and the problems of dispersion and poor sharing of a large number of agricultural file data resources are solved. Technically, this paper applies cloud storage technology to agricultural data management, which is relatively novel.
【學(xué)位授予單位】：山東農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TP333

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