Research On Resource Scheduling In Agricultural Data-Grid System

Agriculture data resource sharing is most important to Chinese agricultural informationization. With the continuous progress of the Chinese agricultural informationization, agricultural information network system has been constructed, all kinds of agricultural data and information growing exponentially. But for the lack of effective and necessary linkages of the servers, many agricultural information islands bring out, in which a large number of agricultural information was locked. And this has brought a great inconvenience to the agricultural users. Therefore, how to integrate the heterogeneous, autonomous agricultural information distributed on the Internet with advanced technologies and methods to achieve efficient agricultural information sharing, has become the central issue of agricultural informationization.Grid is a kind of important information technology in recent years. It provides the new thought and method for the distributed resource networked-sharing management and real-time application in dynamic environment. Especially the Data Grid technology happens to be the best way to solve the agricultural information resource sharing problem. Because Data Grid technology places an extra emphasis on data resource collaborating, which can realize the sharing and access of massive, distributed and heterogeneous data resources. In the field of agriculture, the use of grid technology to achieve the sharing of agriculture information resource is of great significance to provide convenient One-stop resource sharing service, and promote the collaboration of agricultural information organization, impel the progress of Chinese agricultural informationization. However, resources are large-scale, distributed, dynamic, and heterogeneous in the environment of Agricultural Data Grid. So, the resource scheduling mechanism and method must not rely on a centralized control, and have the characteristics of distribution-style, expansible, adaptable to dynamic changes of resource, in order to improve the stability, robustness, scalability and load balancing of Agricultural Data Grid system. Concerned on the characteristics of Agricultural Data Grid system, this paper conducts in-depth study and discussion on the Agricultural Data Grid resource scheduling technology.The paper firstly investigates the status quo of the grid both at home and abroad, and discusses the practical significance and application prospect of Agriculture Data Grid System, and introduces the key techniques of grid resource scheduling, and the current famous grid project scheduling solution. Secondly, the paper constructs the agricultural data grid resources scheduling system model, which is based on the study of Globus project, and analyses the factors affecting resource scheduling and the scheduling objectives, the scheduling mechanism based on Service Instance Pool, and proposes the dynamic resource scheduling strategy and scheduling algorithm. And then, the agricultural data grid resource scheduling simulation environment is constructed to verify the scheduling model, scheduling strategies and algorithms through the conclusion. Finally, the thesis summarizes the deficiency in the work, and points out the perspective of further work.