Redis Sentinel
Redis Sentinel is a high-availability solution for Redis, designed to monitor Redis master and replica instances, automatically handle failover in case of master failure, and notify system administrators of issues. It provides automatic failover, configuration provider, and notification capabilities to ensure Redis deployments remain available and resilient to failures. Sentinel operates as a distributed system with multiple Sentinel processes collaborating to achieve consensus on the state of the monitored Redis instances.
Developers should use Redis Sentinel when building production-grade Redis deployments that require high availability and automatic failover without manual intervention, such as in e-commerce platforms, real-time analytics, or session management systems where downtime is unacceptable. It is particularly valuable in distributed environments where Redis serves as a critical data store, ensuring continuous operation even if the primary Redis instance fails, by promoting a replica to master and updating client configurations automatically.