CDN Invalidation Sequencing via Layered Virtual Machine
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Solution Overview
Problem
Content delivery networks (CDNs) face challenges in efficiently managing resource invalidation across distributed systems, leading to inconsistencies and increased latency in content delivery.
Innovation Solution
Implementing a system that utilizes a layered virtual machine (LVM) and request collection lattice (RCL) to manage resource invalidation through a distributed request processing system, enabling efficient computation and peering policy refinements across clusters and super-clusters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional resource invalidation methods are used in CDNs, then resource updates can be propagated, but latency increases and delivery efficiency decreases
Solution Approach 1:
The system performs preliminary actions by pre-computing invalidation sequences and maintaining peering policies before invalidation is needed. The layered virtual machine architecture pre-establishes the hierarchical structure and relationships between clusters, enabling faster response when invalidation events occur without requiring real-time computation
Solution Approach 2:
The CDN is segmented into a hierarchical structure with super-clusters containing multiple clusters, which are further divided into leaf clusters. This segmentation allows invalidation to be propagated in a structured manner through the hierarchy rather than requiring global synchronization across the entire distributed system, reducing overall latency
2Quantity of substance
If distributed request processing is implemented across multiple clusters, then system capacity increases, but coordination complexity and inconsistency risks increase
Solution Approach 1:
The layered virtual machine acts as an intermediary layer between the origin server and the distributed cluster network. It receives invalidation requests, computes the appropriate propagation sequence, and coordinates delivery to specific clusters in the hierarchical structure, simplifying the coordination complexity while maintaining high system capacity
Solution Approach 2:
The system introduces a hierarchical dimension to the distributed architecture, organizing clusters into super-clusters and leaf clusters. This dimensional organization allows for more efficient coordination by enabling invalidation to be targeted at specific hierarchical levels rather than requiring coordination across all nodes simultaneously
3Reliability
If real-time computation is performed for invalidation sequencing, then delivery freshness improves, but processing overhead increases
Solution Approach 1:
The system performs preliminary computation by pre-establishing the hierarchical cluster relationships and peering policies in the layered virtual machine. When invalidation occurs, the system leverages these pre-computed structures to determine propagation sequences without requiring intensive real-time computation, reducing processing overhead while maintaining content freshness
Data Source
AI summary
A computer-implemented method includes providing, at a first time and to a first group of CD services in a CDN, invalidation information relating to at least one resource; and providing the invalidation information, at a second time distinct from the first time and to a second group of CD services in the CDN, the second group of CD services being substantially distinct from the first group of CD services.