周末在家仔細研讀了一篇Akamai幾年前的CDN架構綜述，做了點筆記，先簡單整理如下。

Akamai CDN中的幾個重要組件 mapping system 調度系統(映射client到edge cluster，進而到edge server) edge server platform 邊緣服務器系統 transport system 分層(tired)回源系統 communications and control system 通信與控制系統(收集狀態信息，下發控制消息，配置更新等等) data collection and analysis system 數據收集和分析系統(server log，client log， network and server information),又名Query系統 management portal 管理portal(配置更新，業務指標展示) 輔助系統和服務 DNS Monitoring Agents Global Traffic Manager Storage Client Slide Delivery (p2p)

下面對各分系統做進一步說明： mapping system: scoring part, collecting and processing historic and real-time data---including real-time mapping part, two main steps: map to cluster map to server
Edge Server Platform(metadata configuration) origin server location cache control cache indexing Access control Response to origin server failure Header alteration EdgeComputing Performance optimization
Communications and Control System包括: real-time distribution of status and control information point-to-point RPC and Web Services Dynamic configuration updates key management infrastructure software and machine configuration management
Data Collection and Analysis System包括： Log collection Real-time data collection and monitering Analytics and Reporting
參考文獻 [1].the-akamai-network-a-platform-for-high-performance-internet-applications-technical-publication.pdf

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