KIP-889 — Versioned State Stores

Accepted Kafka 3.5 Streams

KIP-889 introduces versioned (multi-version) state stores in Kafka Streams that retain multiple timestamped values per key, enabling the store to answer point-in-time lookups. Existing state stores keep only the latest value per key, making stream-table joins produce incorrect results for out-of-order records because the correct historical table value is no longer available.

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