Cache Selection
A single cache, of course, won't do. There must be multiple caches of the same original content, possibly located around the world for popular Web and video streaming sites. An interesting technical problem is how to determine the optimum cache from which content should be retrieved.
Consider the case of a master Web site located in Silicon Valley. Caches are installed on the East Coast, Europe, and Japan. Now consider the case of a user in Australia. Which cache should provide the information?
Intuitively, the nearest cache as measured in geographical terms is preferred. In this case, the nearest cache geographically would be Japan. But there may be instances when that cache is down, or when the link between Australia and ...
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