Don't add a read replica until you've read this

The text discusses the implementation and benefits of using read replicas in managing database workloads, particularly for incident.io, an incident management product. As companies face growing database demands, read replicas help offload read-heavy queries, enhancing performance and reliability during high-traffic events. However, this approach introduces complexity, such as ensuring read-after-write consistency to prevent stale data reads. Techniques like using log sequence numbers (LSN) and context-aware routing strategies are described to address these challenges, ensuring that writes are accurately reflected in reads across different system components. The implementation led to a significant reduction in CPU usage on the primary database, enabling better handling of disaster situations and setting the stage for horizontal scaling. The company emphasizes transparent, opt-in database routing strategies to maintain seamless operations for engineering teams, achieving a balance between efficient data handling and system stability.

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