Hot keys create single-node bottlenecks in Redis clusters

Frequently accessed data that isn't distributed across multiple shards becomes a bottleneck, concentrating load on a single node. This defeats horizontal scaling benefits and creates performance ceiling for the application.

Sources

• https://www.groundcover.com/blog/monitor-redis
• https://redis.io/tutorials/redis-anti-patterns-every-developer-should-avoid/?hmsr=joyk.com

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