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RedisYoav Peled3 min readintro

Introducing Smooth Scaling: faster, more intelligent scaling

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Summary

Redis Cloud Pro introduces Smooth Scaling, which leverages atomic slot migration (ASM) from Redis 8.4 to move only the necessary hash slots during scaling. This shortens scaling windows and reduces impact on live traffic without any code changes.

  • Smooth Scaling uses atomic slot migration to move individual hash slots directly, avoiding intermediate states.
  • Scaling operations complete faster, especially for small capacity changes, leading to smaller throughput dips and latency spikes.
  • The feature is transparent to applications—no code changes or new APIs are required.
  • Automatically enabled for RAM‑based Redis Cloud Pro databases version 8.4+ with the default hashing policy; not supported for Active‑Active or Flex.

Engineers running Redis Cloud Pro should care because faster, less disruptive scaling improves reliability and performance during traffic spikes.

5/10
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