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> calling it "Exactly-once delivery with kafka" is slightly misleading

Indeed. Idempotent operations is the mainstay of managing "at least once" message delivery. If you had a true "exactly once" system, idempotency would be unnecessary.

> Regardless of the title this is an amazing feature.

I feel it's a good iterative step forward, but nothing near the "revolutionary" that's being boasted.




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