| CDN (Content Delivery Network) is a layer of intelligent Internet virtual Network configured through the server placed throughout the Network node on the basis of the existing Internet Network. CDN system can guide the users’ requests to the closest service node in real time according to the integrated information such as Network traffic, each node connections, load condition and the distance to the user and the response time, etc. The purpose of which is that the user can obtain the content to the nearest, solve the problem of the Internet network congestion and improve the response speed of the user to access the website.The definition of CDN by Radio and Television Industry referred as from the ISA architecture to NGOD architecture, coming from North America at the earliest,and even the NGB architecture definited by S ARFT (The State Administration of Radio Film and Television), CDN just work as content distribution components. If the CDN is corresponded with the Internet or IPTV, it should include the CDN+VSS+SRM.The CDN network architecture of Radio and Television Industry generally includes:data center, pushing flow server and CDN network.The effects of Data center include:services of multimedia data storage, film slice, content management, content distribution, user behavior analysis, data report.In this paper, based on the existing CDN network data center of Radio and Television Industry, through the analysis of the actual business requirements and business processes of Radio and Television Industry, as well as the problems and defects existing in current system, and combining with the idea of information security, a data center system is designed and implemented to meet the special business requirements and needs of Radio and Television Industry.Firstly, on the basis of discussion about the background of the Radio and Television Industry CDN data center system project and the problems confronted of its development and design, the paper analyzes the system’s functional requirements and non-functional requirements and elaborate the system requirements one by one and discussed in detail.On the basis of demand analysis, we have carried on the design of the Radio and Television Industry CDN system architecture.First of all, system design target and principle is come up with according to the system requirement, and then design of the technical architecture have been conducted on.The main considerations of technical architecture contain system scalability, maintainability, and performance issues, so big data processing the most popular big data processing architecture-Hadoop is adopted, based on which, the design analysis is conducted. In the functional architecture design, it discusses the functions of the each part of the system composition, and according to the physical architecture and logical architecture outputs the overall design.Next comes the detailed design of CDN data center system.This part is to design the system according to the hierarchical and modular software design idea, and the design of each module are described. In system modeling, in order to more fully understand the design of the data center system, we simply introduced the CDN system of Radio and Television Industry and analyze the role and position of the data center in it. And then the overall structure graph of data center is given. After understanding the whole structure, according to the demand analysis of hierarchical and modular software design idea, we respectively discussed the detailed design of each module.The fourth part, on the basis of the detailed design, we first make a simple introduction to the realization of each module, put up with the overall effect map and the realization of the various parts of the system. In this section, first of all, the performances of the system specifications are discussed. And on the basis of the definition of performance specifications, mathematical model of the data in the data center is built and algorithm is analyzed and the data structure realization is proved.Secondly, on the basis of algorithm and data structure, the performance test is conducted and combined with a detailed analysis on the environment building of pressure test and testing process.Finally, the application of CDN network for data center systems are briefly introduced in this paper and the system further improvements are proposed.In summary, based on the detailed analysis of the Radio and Television Industry CDN data center system’s business requirements and the theory of large data storage and processing, we design and realize the data center systems for the broadcasting industry CDN network. |
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