16.6. Summary
Whichever point on the request processing path implements request redirection must select the server for a given request. Server selection is based on performance metrics of individual servers. The main types of metrics are proximity metrics measuring the geographical or network distance between the client and a server, load metrics that measure the load of individual servers, and aggregate metrics that reflect the overall performance of client fetches from various servers.
Aggregate metrics are the best predictors of the relative performance of replica servers because these metrics directly reflect the download performance. Clients are well equipped to use aggregate metrics; however, performing server selection at a client requires ...
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