DNS Resolver Cache Sharing via Multicast Communication
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Solution Overview
Problem
Current DNS record cache management across multiple DNS servers is inefficient due to reliance on centralized caching solutions, which introduce single points of failure and increase recursive lookup times when cache misses occur.
Innovation Solution
Implementing multicast communication among DNS resolver nodes within the same data center to share cache updates, allowing each node to maintain its own cache and reduce the need for outbound queries to authoritative nameservers, thereby distributing cache updates and eliminating single points of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a centralized caching solution is used to manage DNS records across multiple DNS servers, then cache management is simplified, but single points of failure are introduced and query response times increase when cache misses occur
Solution Approach 1:
The patent divides the centralized cache into distributed caches across multiple DNS resolver nodes. Each node maintains its own cache independently, eliminating the single point of failure associated with centralized caching. The segmentation is achieved through multicast group membership where each resolver node can independently store and retrieve DNS records without relying on a central authority.
Solution Approach 2:
The patent introduces multicast communication as an intermediary mechanism to enable cache sharing among distributed resolver nodes. Instead of direct peer-to-peer communication or centralized coordination, multicast messages serve as the mediator that allows efficient propagation of DNS records across the network, maintaining simplicity while achieving distribution.
2Reliability
If each DNS resolver node maintains its own local cache, then reliability is improved by eliminating single points of failure, but cache hit ratios decrease due to lack of cache sharing
Solution Approach 1:
The patent merges the functionality of multiple independent caches into a unified distributed cache system. Through multicast communication, DNS records cached by one resolver node are automatically propagated to other nodes in the group, effectively combining the cache capacities of all nodes while maintaining individual node autonomy and reliability.
Solution Approach 2:
The patent implements a feedback mechanism where resolver nodes publish DNS records they acquire to the multicast group. Other nodes receive these publications and update their local caches accordingly, creating a continuous feedback loop that maintains cache synchronization across the distributed system without central coordination.
3Stability of the object's composition
If outbound queries are sent to authoritative nameservers for every cache miss, then cache consistency is maintained, but query response times increase and network traffic increases
Solution Approach 1:
The patent performs preliminary action by having resolver nodes proactively publish DNS records to the multicast group as soon as they are acquired from authoritative nameservers. This allows other nodes to obtain records before they would need to query authoritative nameservers themselves, reducing response times while maintaining consistency through the publish-subscribe model.
Solution Approach 2:
The patent uses copying to propagate DNS records across the distributed cache system. When one resolver node obtains a DNS record, it creates copies and distributes them to other nodes via multicast communication. This copying mechanism maintains cache consistency across all nodes without requiring each node to independently query authoritative nameservers.
4Productivity
If multicast communication is implemented among DNS resolver nodes, then cache sharing is achieved and response times are reduced, but network complexity increases
Solution Approach 1:
The patent leverages the universality of multicast communication, which is already a standard network protocol supported by most modern networks. By using this existing infrastructure, the patent achieves complex distributed cache sharing functionality without adding significant network complexity, as multicast is handled natively by network devices rather than requiring custom protocols or infrastructure.
Data Source
AI summary
A Domain Name System (DNS) resolver node receives a first DNS query from a first client device. The resolver node determines that it cannot answer the query using its local cache so it performs a recursive query to obtain the answer. The answer is sent to the first client and stored in its local cache. The resolver node further transmits the answer to multiple other resolver nodes that are part of the same cluster so they can update their respective local cache with the information. Upon receiving a message from another resolver node that includes a set of resource record(s) not in its local cache, the resolver node stores that set of resource record(s) in its local cache so that it can locally answer subsequent requests for those resource record(s) locally.