周末在家仔細(xì)研讀了一篇Akamai幾年前的CDN架構(gòu)綜述，做了點(diǎn)筆記，先簡單整理如下。

Akamai CDN中的幾個(gè)重要組件 mapping system 調(diào)度系統(tǒng)(映射client到edge cluster，進(jìn)而到edge server) edge server platform 邊緣服務(wù)器系統(tǒng) transport system 分層(tired)回源系統(tǒng) communications and control system 通信與控制系統(tǒng)(收集狀態(tài)信息，下發(fā)控制消息，配置更新等等) data collection and analysis system 數(shù)據(jù)收集和分析系統(tǒng)(server log，client log， network and server information),又名Query系統(tǒng) management portal 管理portal(配置更新，業(yè)務(wù)指標(biāo)展示) 輔助系統(tǒng)和服務(wù) DNS Monitoring Agents Global Traffic Manager Storage Client Slide Delivery (p2p)

下面對(duì)各分系統(tǒng)做進(jìn)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(xiàn) [1].the-akamai-network-a-platform-for-high-performance-internet-applications-technical-publication.pdf

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