TRANSFORMING ACTIVE-ACTIVE ARCHITECTURES: LEVERAGING MVCC FOR SAAS SCALABILITY AND CONSISTENCY

Abstract

With the state at which modern highly complex distributed systems and global SaaS platforms are, maintaining strong consistency and scalability when running the applications in active-active architectural patterns comes with significant challenges. Active-active systems, which distribute traffic among various nodes across multiple regions, while help with maintaining high availability, face difficulties to ensure data consistency, handle high levels of concurrency, and stay within real-time Service Level Agreements (SLAs). For systems dealing with data persistence use cases, which is the case with majority of the large-scale SaaS platforms, traditional database methods like two-phase commit (2PC) and optimistic locking mechanisms often fail to meet the expected performance at scale, resulting in bottlenecks and delays when dealing with large volumes of incoming traffic, especially in real-time systems. To improve these scenarios, this paper explores how Multi-Version Concurrency Control (MVCC) databases present an efficient solution to these issues by allowing non-blocking, concurrent writes while preserving transactional consistency among geographically distributed nodes of the database. MVCC ensures that records undergoing constant state changes, such as those found in financial transactions and e-commerce platforms, can be managed without conflicts, even when numerous users or processes are interacting with the same data simultaneously. Additionally, the article aims to discuss the unique benefits that MVCC databases can offer towards active-active architectures, such as enhanced throughput, dynamic scaling, and improved conflict resolution in real-time scenarios. It also discusses how MVCC can enhance complex workflows found in multi-tenancy systems such as ticketing platforms, while maintaining strong consistency and high availability.