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	The new architecture of realcourse
	Zhang Jinyu ; Li Xiaoming
	2006
英文摘要	Realcourse([1]) is a distributed digital content (including Video) publishing and delivering platform deployed on Internet, with over 20 servers across cities in China. It is supported by the ChinaGrid([2]). For the past two years, realcourse has proven itself a great success for having accumulated over 3000 hours of university lecture videos and servicing about ten thousand video streams a day. Nevertheless, we realize two design limitations that will impair the scalability while the system grows to its next level. In this paper, after a brief introduction of the limitations, a new architecture and operational mechanism are described in details together with an elaboration of the design philosophy behind it. One key point is emphasized that the straightforward application positioning at noncritical video publishing and delivering greatly reduces the strictness of consistency requirement of realcourse, which leads to a different architecture from some traditional distributed file systems such as Sprite([3]), NFS[4] and AFS([5]). In this architecture, the "proximity rule" is the fundamental design goal which requires that in most cases the video is delivered to the user from the "closest" sever and of better performance.; Computer Science, Theory & Methods; CPCI-S(ISTP); 0
语种	英语
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/293537]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Zhang Jinyu,Li Xiaoming. The new architecture of realcourse. 2006-01-01.

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