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Long-form notes from the maintainers — the design decisions, migration playbooks, and engineering lessons behind running stateful actors on Apache Flink 2.x.

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• We forked Apache Stateful Functions for Flink 2.x — here's why Why the project exists, what we changed under the hood, what stayed the same for upstream users, and where this fits versus Kafka Streams, ksqlDB, and Akka. 2026-05-03