SILC: Lookahead Caching for Short-form Video Delivery Systems
Maleeha Masood, Shreya Kannan, Om Chabra, Deepak Vasisht, Indranil Gupta

TL;DR
This paper introduces SILC, a lookahead caching system for short video platforms that leverages push-based recommendations and popularity skew to reduce CDN cache misses and bandwidth costs.
Contribution
SILC is a novel lookahead-aware caching system that exploits the unique features of short video platforms to improve caching efficiency and reduce bandwidth usage.
Findings
SILC reduces CDN midgress costs by 11.1% to 111% compared to existing policies.
Evaluation used real user traces from an in-person study and a global TikTok user donation program.
Simulations involved traffic from 10,000 simultaneous users.
Abstract
Short video platforms like TikTok, Instagram Reels, and YouTube Shorts have gained immense popularity in the last few years and are responsible for a large and growing fraction of Internet traffic. We identify two unique opportunities for improving short video delivery using their existing interactions with content delivery networks (CDNs). First, short videos use a push-based recommendation system, where the user is presented a sequence of videos recommended by the algorithm rather than user explicitly picking content to watch (e.g., in YouTube). Such push-based short video systems offer a unique opportunity for system design by providing visibility into upcoming requests. Second, the popularity of these videos follows a highly skewed Pareto distribution, leading to geographical and temporal overlap amongst videos being served. We leverage these opportunities to build SILC - a…
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