How Upstash Keeps Your Redis Up When an Availability Zone Isn't
Blog post from Upstash
In May 2026, a cooling failure at an AWS availability zone in Northern Virginia caused significant service disruptions for companies like Coinbase and FanDuel, highlighting the vulnerabilities of relying on a single availability zone for database operations. To prevent such outages, Upstash employs a multi-availability zone (multi-AZ) strategy that spreads database replicas across different zones, ensuring high availability and minimizing downtime. When a zone failure occurs, the system's failover mechanism promotes the most up-to-date replica, avoiding data loss by ensuring only the closest to the primary's current state is promoted. The system also implements strategies to keep replicas synchronized, applies backpressure to prevent backups from lagging, and routes reads intelligently to avoid stale data. This design minimizes cross-zone traffic costs by compressing only necessary data and optimizes read performance by using proxies that route requests to the nearest available replicas. The multi-AZ setup is implemented effortlessly with Upstash's Prod Pack, making high availability seamless and invisible to the end user, ensuring continuity even during zone failures without requiring any additional configuration from developers.
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