14.2. Content-Blind Request Distribution with Partial Replication
When a request redirection mechanism is oblivious to the objects being requested, a request for any object may be sent to any available server that replicates the Web site. This implies that any server must be able to fulfill any request. To have this ability, it may seem that every server must have a full replica of the entire Web site. While full replication is indeed often used, it is rather wasteful, considering that typically only a small fraction of content is responsible for most of the requests; it may become prohibitively wasteful for hosting service providers, due to their scale. This section describes two techniques that allow partial replication while still performing ...
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