Networking @Scale Summer 2022
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Quick Cache DSR | Matt Joras and Yair Gottdenker

In a typical CDN architecture the caching tier is fronted by a load-balancing tier; response content flows from the cache to the requester through the load-balancer. With this architecture extra I/O, CPU cycles and intra-cluster network bandwidth are spent to stream the content through multiple hops. We present a solution utilizing QUIC’s properties to implement a form of Direct Server Return (DSR) from the caching layer, directly to the client. This form of DSR obviates the need for most intra-cluster communication when serving cached content. In this talk we go over the technical challenges in implementing QUIC cache DSR, its security properties, the expected performance improvements, and future applications.

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