Enhancement of YouTube CDN with Caching Hierarchy and New Replacement Policy

Varangpa Suranuntakul and Chutimet Srinilta


Caching System, CDN, Replacement Policy, YouTube


YouTube has become a highly successful video sharing website and has had an enormous impact on the Internet traffic. Content Delivery Network (CDN) is one possible solution which can provide users on a global scale faster access while reducing traffic on the backbone. Its performance gain nevertheless depends in large part on efficient caching management. The caching techniques using caching hierarchy in surrogate servers of YouTube CDN have been proposed in this paper. Moreover, a new replacement policy (equation) for use in the replacement system and our caching hierarchy are discussed. Through a detailed simulation environment, the proposed techniques can significantly improve caching performance relative to the other polices.

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