Cross-Cluster Direct Server Return in CDN Routing
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Solution Overview
Problem
Content delivery networks (CDNs) face inefficiencies in routing client requests across clusters, leading to suboptimal content delivery due to incomplete or inaccurate information about client locations and server loads, resulting in potential delays and reduced performance.
Innovation Solution
Implementing cross-cluster Direct Server Return (DSR) mechanisms that allow initial contact servers to migrate requests to better-suited servers within different clusters based on real-time information about client locations, server loads, and content properties, using direct server return protocols to optimize content delivery paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If requests are routed to initial contact servers based on available information, then requests can be processed, but delivery efficiency deteriorates when servers are overloaded or geographically distant
Solution Approach 1:
The patent implements dynamic request routing by enabling initial contact servers to migrate requests to better-suited servers in different clusters based on real-time conditions. The system continuously monitors server load, geographic location, and content properties to dynamically adjust request paths, allowing the network to adapt to changing conditions and always route requests through optimal servers.
Solution Approach 2:
The patent employs feedback mechanisms where servers provide information about their current load status, geographic location, and content availability. This feedback enables the routing system to make informed decisions about request migration, allowing the network to respond to actual system conditions rather than relying on static routing tables or incomplete information.
2Productivity
If cross-cluster request migration is implemented, then content delivery performance improves, but system complexity increases
Solution Approach 1:
The patent makes the initial contact server multi-functional by enabling it to perform both its original role of handling requests and the additional role of evaluating and migrating requests to other clusters. This universal approach eliminates the need for separate dedicated routing infrastructure, as existing servers gain enhanced capabilities through software-based decision-making and request migration mechanisms.
3Measurement precision
If complete real-time information about all servers is collected, then optimal routing decisions can be made, but information collection overhead increases
Solution Approach 1:
The patent implements local quality by having each initial contact server evaluate and collect information primarily about servers within its own cluster and nearby clusters. Rather than requiring complete global information about all servers in the network, the system makes routing decisions based on locally available information about server load, geographic proximity, and content properties, reducing the overhead of information collection while maintaining routing accuracy.
Data Source
AI summary
A computer-implemented method, operable on a device in a content delivery network (CDN), wherein the CDN delivers content on behalf of at least one content provider, the device implementing a content delivery (CD) service, the method includes receiving a request from a client for particular content; determining a second device in the CDN, the first device being in a first cluster and the second device being in a second cluster distinct from the first cluster; migrating the request to the second device; and then providing the second device with network traffic from the client.