Redis Cluster distributes data across multiple nodes using consistent hashing with 16,384 hash slots, each shard managing a portion of the keyspace. Each master node supports replica nodes for automatic failover. Redis Cluster should be deployed when a single instance cannot handle the required throughput, when the dataset exceeds the memory capacity of a single node, or when high availability with automatic failover is needed. Most applications do not require Redis Cluster until reaching 100,000 operations per second.
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