What is Redis cluster hash slot mechanism and why is it important?

Redis Cluster divides data into 16384 hash slots distributed across nodes.

Each key in Redis Cluster is mapped to one of 16384 hash slots using CRC16 hashing. These slots are distributed across nodes, enabling horizontal scaling. When a request is made, Redis determines the slot and routes it to the correct node. This mechanism ensures efficient data distribution and avoids the need for centralized routing.