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Content Delivery Networks (CDNs) have gained immense popularity over theyears. Replica server placement is a key design issue in CDNs. It entailsplacing replica servers at meticulous locations, such that cost is minimizedand Quality of Service (QoS) of end-users is satisfied. Many replica serverplacement models have been proposed in the literature of traditional CDN. Asthe CDN architecture is evolving through the adoption of emerging paradigms,such as, cloud computing and Network Functions Virtualization (NFV), newalgorithms are being proposed. In this paper, we present a comprehensive surveyof replica server placement algorithms in traditional and emerging paradigmbased CDNs. We categorize the algorithms and provide a summary of theircharacteristics. Besides, we identify requirements for an efficient replicaserver placement algorithm and perform a comparison in the light of therequirements. Finally, we discuss potential avenues for further research inreplica server placement in CDNs.

A Survey on Replica Server Placement Algorithms for Content Delivery Networks