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How S3 keeps 500 trillion+ objects at 11 nines of durability and 200M+ requests a second: a partitioned index kept apart from 10 + 6 erasure-coded bytes spread across three AZs, fast repair, a witness check that makes every read see the latest write, prefix partitions that split on load, and versioning and Object Lock for the deletes durability can't stop.
Picture a developer at the end of a long night.