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Handling flash crowds poses a difficult task for web services. Content Distribution Networks (CDNs), hierarchical web caches, and peer-to-peer networks have all been proposed as mechanisms for mitigating the effects of these sudden spikes in traffic to under-provisioned origin sites. Other than a few anecdotal examples of isolated events to a single server, however, no large-scale analysis of flash-crowd behavior has been published to date. In this paper, the authors characterize and quantify the behavior of thousands of flash crowds on CoralCDN, an open content distribution network running at several hundred POPs.
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