The best of both worlds: high availability CDN routing without compromising control
The best of both worlds: high availability CDN routing without compromising control
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两全其美:高可用性 CDN 路由而不影响控制
DOI:
10.1145/3517745.3561421
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Calder, Matt
中科院分区:
文献类型:
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作者:
Zhu, Jiangchen;Vermeulen, Kevin;Cunha, Italo;Katz-Bassett, Ethan;Calder, Matt
Content delivery networks (CDNs) provide fast service to clients by replicating content at geographically distributed sites. Most CDNs route clients to a particular site using anycast or unicast with DNS-based redirection. We analyze anycast and unicast and explain why neither of them provides both precise control of user-to-site mapping and high availability in the face of failures, two fundamental goals of CDNs. Anycast compromises control (and hence performance), and unicast compromises availability. We then present new hybrid techniques and demonstrate via experiments on the real Internet that these techniques provide both a high level of traffic control and fast failover following site failures.