Atomic slot migration with Redis 8.4

Redis 8.4 introduces Atomic Slot Migration (ASM), a major enhancement for Redis Cluster operations, offering significant improvements over the previous slot migration methods by allowing entire slot ranges to be atomically transferred, thus eliminating the inefficiencies of key-by-key migration. This new feature facilitates high availability, scalability, and fault tolerance in Redis Clusters by enabling seamless slot migration when scaling clusters or balancing overloaded nodes. Prior to Redis 8.4, slot migration was a complex and resource-intensive process, often leading to increased latency, client disruptions, and data inconsistencies due to its non-atomic nature. ASM, however, resolves these issues by replicating the entire slot to the destination node with a live delta and performing a single atomic handoff, ensuring minimal client disruption and maintaining high performance during the migration. Benchmark tests show that ASM achieves migration speeds up to 30 times faster than legacy methods, with significantly reduced latency spikes and network overhead. The implementation of ASM leverages a new migration command, CLUSTER MIGRATION, which initiates the process from the destination node, sets up replication connections, and efficiently manages data transfer and ownership handoff with minimal performance impact.

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