A Review of the Saga Pattern for Distributed Transactions in Microservices Architecture

Microservices architecture has revolutionized software development by decomposing applications into small, independent services that can be developed, deployed, and scaled independently. However, managing transactions that span multiple microservices remains a significant challenge due to decentralized data ownership and autonomous service deployment. Traditional approaches, such as Two-Phase Commit (2PC), often introduce performance bottlenecks and reduce reliability in distributed environments. The Saga pattern addresses these issues by coordinating a sequence of local transactions with compensating actions to achieve eventual consistency. This paper presents a comprehensive review of the Saga pattern, outlining its core principles and two primary implementation styles: orchestration-based and choreography-based. It compares the Saga pattern with other distributed transaction models, including 2PC and the Outbox pattern, highlighting trade-offs in performance, consistency, and complexity. Real-world use cases and available tooling are examined to demonstrate practical adoption. Key challenges, such as compensation logic, idempotency, observability, and fault tolerance, are explored in depth. Finally, emerging research areas are discussed, including advanced orchestration strategies, formal verification methods, and integration with novel computing paradigms. By evaluating the strengths and limitations of the Saga pattern, this review offers practical insights for developers and system architects, while also identifying opportunities for future research aimed at improving the resilience and scalability of microservices-based applications.