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Why doesn Java System Web Proxy Server support full replication?

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Why doesn Java System Web Proxy Server support full replication?

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Sun believes caching on-demand is a much more appropriate model for either the World Wide Web or an intranet. Common indexes should be distributed, but data can (and should) be stored wherever is most appropriate on the network. If Proxy Servers are deployed, there will be a 50 percent to 75 percent chance that the document will be cached locally and no chance of getting stale data. Java System Web Proxy Server uses sophisticated statistical analysis to store the documents most likely to be needed. It also manages document expiry and version control, and by default checks the home server every time a document is requested. Full replication like that performed by other softwares presumes that each document needs to be fully replicated on every server(imagine doing that on the Web!). This model limits the scalability of the infrastructure, and requires many more servers, more hardware, and more management complexity. More importantly, it increases the likelihood of getting stale data. A

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