Migration at Scale: Moving Marketing Cloud Caching from Memcached to Redis at 1.5M RPS Without Downtime

Summary

The article discusses a complex migration of the Marketing Cloud Caching infrastructure from Memcached to Redis, achieving a zero-downtime transition while handling approximately 1.5 million cache events per second. It details the challenges faced, including the need for high availability, security, and performance, alongside the implementation of a Dynamic Cache Router to manage traffic between the two caching systems. The migration involved meticulous planning to ensure behavioral parity and operational control, with a focus on maintaining low latency and stable performance metrics throughout the process. The article also highlights the proactive measures taken to identify and mitigate hot-key issues, ensuring the reliability of the Redis Cluster under production conditions.

Key Learnings

• 1Achieving zero-downtime migration requires careful planning and the implementation of a Dynamic Cache Router to manage traffic between legacy and new systems.
• 2Maintaining behavioral parity during migration is critical to avoid application disruptions, necessitating a compatibility layer for TTL and key handling.
• 3Proactive hot-key detection and mitigation strategies are essential for maintaining performance and stability in high-throughput caching scenarios.
• 4The use of real production traffic for validation is crucial to accurately assess performance metrics and ensure that the new system meets operational expectations.
• 5Segregating read and write traffic can significantly enhance overall cluster stability and performance, especially under high load conditions.

Who Should Read This

Senior Data Engineers managing high-throughput caching solutions in production environments

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