Segment Routing Cache Management for CDN Content Delivery
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Solution Overview
Problem
Conventional content distribution systems face limitations such as reliance on DNS and TCP/IP infrastructure, leading to static distribution models, inability to exploit multi-destination delivery, coarse fetch operations, and complex caching optimization, which hinder efficient streaming content delivery.
Innovation Solution
The use of Segment Routing (SR) protocol architectures with IPv6 properties and an interception process for managing distributed CDN content caches, enabling atomic operations and autonomous cache management, allowing for a data-centric object fetch approach that optimizes content delivery and caching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional content distribution systems use DNS and TCP/IP infrastructure, then the system can operate with standard network protocols, but the distribution model becomes static and cannot exploit multi-destination delivery
Solution Approach 1:
The patent introduces Segment Routing (SR) as an intermediary mechanism between standard TCP/IP and content distribution. SR headers are inserted into packets to enable multi-destination delivery and dynamic path selection without replacing the underlying TCP/IP infrastructure. This mediator approach allows advanced distribution patterns while maintaining compatibility with standard protocols.
Solution Approach 2:
The patent segments the routing information into separate SR headers that can be independently processed. Each packet carries segment lists that define specific paths and destinations, allowing the system to divide and direct traffic to multiple destinations simultaneously. This segmentation enables dynamic distribution patterns without requiring complete protocol replacement.
2Productivity
If HTTP protocol is used for content fetch operations, then the system can operate with standard web protocols, but the fetch operations become coarse-grained and inefficient for streaming content
Solution Approach 1:
The patent segments content into smaller chunks that can be fetched independently using SR-based direct routing. Instead of coarse-grained HTTP transactions, the system uses fine-grained chunk-level operations with SR headers that enable efficient, targeted retrieval. This segmentation dramatically improves fetch efficiency for streaming content while reducing protocol overhead through direct routing.
Solution Approach 2:
The patent substitutes the HTTP application-layer mechanism with a network-layer SR-based direct routing mechanism. This replacement eliminates the overhead of HTTP transaction processing for content fetching, using instead efficient SR header-based routing that operates at the network layer, significantly improving fetch operation efficiency.
3Productivity
If sophisticated caching strategies are implemented to optimize bandwidth and server load, then caching efficiency improves, but the system complexity and management difficulty increase
Solution Approach 1:
The patent implements autonomous cache management where cache servers automatically make decisions about content storage and retrieval using SR-based routing information. Each cache server independently determines optimal caching strategies based on local conditions and SR packet information, eliminating the need for complex centralized cache management systems. This self-service approach maintains high caching efficiency while reducing management complexity.
Solution Approach 2:
The patent incorporates feedback mechanisms where cache servers monitor their local conditions and adjust caching behavior accordingly. SR headers carry information about content priority and destination requirements, which cache servers use to make real-time caching decisions. This feedback-driven approach optimizes caching efficiency without requiring complex external management, as each cache server adapts autonomously based on observed conditions.
4Adaptability or versatility
If point-to-point transport like TCP is used, then the system can ensure reliable delivery, but the ability to exploit multi-destination delivery is lost
Solution Approach 1:
The patent segments the routing function by inserting SR headers that contain segment lists defining multiple destinations. Each packet can carry routing information for multiple destinations, enabling single packets to serve multiple recipients reliably. This segmentation approach maintains TCP's reliability guarantees while extending capability to multi-destination delivery through network-layer routing information.
Solution Approach 2:
The patent adds a network-layer dimension to TCP's application-layer point-to-point model. SR headers operate at the network layer to define multi-destination paths, while TCP continues to provide reliable transport. This dimensional addition allows packets to be routed to multiple destinations simultaneously without compromising the reliability guarantees provided by TCP's acknowledgment and retransmission mechanisms.
Data Source
AI summary
Content distribution system cache management may be provided. First, a sync packet may be received by a cache server from a first server. The sync packet may include a list indicating a cache server where a chunk is to be stored and the address for the chunk. Next, an address for the chunk may be obtained by the cache server by parsing the sync packet. The cache server may then determine that the chunk is not stored on the cache server by using the address for the chunk. Next, in response to determining that the chunk is not stored on the cache server, a connection may be opened between the first server and the cache server. The cache server may then receive the chunk over the connection and cache the chunk on the cache server.