Enhancing Resource Management of the World's Largest PCDN System for On-Demand...
summary
ByteDance documents a deployed system called PCDN with 1M nodes in 200+ cities where 80% of nodes deliver <5 Mbps, 23% sit behind nonpublic IPs and failures exceed 60%. After years of imbalance—22% of nodes overloaded and 30% underutilized—PCDN+ adds a centralized profiling + optimization that outputs target contributions per node-class and a client-side transport control that limits per-connection congestion window to enforce those targets. Large-scale A/B tests show PCDN+ corrects imbalance, raises low-cost resource utilization, cuts bandwidth cost pressure, and matches or improves streaming speed.
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chapters (10)
- 0:00PCDN resource management intro
- 1:29AG nodes replace traditional CDN
- 3:37PCDN delivery core idea
- 4:40Unbalanced resource problems
- 6:46Static decisions limitations
- 8:12PCDN Plus design
- 10:16Profiling and optimization in PCDN Plus
- 11:41Decentralized resource allocation
- 15:15AB tests and performance
- 17:47Summary and future
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