Edge-Native Request Routing with Causal Dependencies

Field of the Invention

The present disclosure relates generally to distributed computing systems, and more specifically to methods and systems for routing requests across geographically distributed edge nodes in a manner that preserves causal consistency.

Background

Modern content delivery networks and edge computing platforms route user requests to the nearest available point of presence. However, when requests carry causal dependencies — for example, a write that must occur after a related read — naive geographic routing can violate those dependencies, leading to inconsistent state across regions.

Summary

The described embodiments encode causal dependencies into a compact metadata header appended to each request. Edge nodes inspect this header to make routing decisions locally, without consulting a centralized coordinator, preserving causality while maintaining the latency benefits of geographic distribution.

Claims

1. A method for routing requests across geographically distributed edge nodes, comprising: receiving a request at a first edge node; identifying a causal dependency associated with the request; and forwarding the request to a second edge node selected based on the causal dependency.
2. The method of claim 1, wherein the causal dependency is encoded in a compact metadata header appended to the request.
3. The method of claim 2, wherein the metadata header is compressed using a run-length encoding scheme.