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Redis's AOF persistence executes each command in memory first and appends it to an on-disk log afterward, which keeps writes non-blocking while still allowing the full dataset to be rebuilt by replaying the log after a crash.

Redis's Append-Only File mechanism logs commands after executing them in memory, enabling non-blocking writes and full dataset recovery via replay. ✦ AI generated

ByteByteGo · ByteByteGo Newsletter · 2026-07-18 · original ↗

When a client sends a command, Redis first executes it in memory (RAM). After that, Redis logs the command by appending it to an AOF file on disk. This ensures every operation can be replayed later to rebuild the dataset. Since the command is executed first and logged afterward, writes are non-blocking.

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