from each other Stateless Example (inspired from the documentation): ‣ Sum values as records arrive ‣ Records: ‣ (alice, 1) = 1 ‣ (charlie, 1) = 2 ‣ (alice, 3) = 5 ‣ → Adds to (alice, 1)
updates Stateful (requires a state store) Example (inspired from the documentation): ‣ Sum values as records arrive ‣ Records: ‣ (alice, 1) = 1 ‣ (charlie, 1) = 2 ‣ (alice, 3) = 4 ‣ → Replaces (alice, 1)