Hybrid Reverse Proxy Architectures: A Copula-Theoretic Perspective on System Reliability

Abstract

This study explores the reliability of hybrid reverse proxy architectures, which combine distributed and centralised load balancing. Due to complex interdependencies among subsystems, traditional reliability models fall short, especially for correlated or cascading failures. The paper introduces a Gumbel copula-based approach to model the joint failure behaviour of these subsystems, effectively capturing the risk of simultaneous extreme failures. The method enables more accurate estimation of complete failure probabilities and supports better fault recovery planning through copula repair strategies, providing a practical framework for improving reliability in complex distributed systems.