hard20 pts · first answer countskafkaflinkdelivery-semantics

Customers get two SMS messages

A Flink job with exactly-once checkpointing calls an SMS gateway inside a map function for each order. After a task failure and restore, some customers get the same SMS twice. Why?

A.The Kafka source lost its offsets in the restoreB.Checkpointing was set to at-least-once by mistakeC.Replayed records repeat calls made to outside systemsD.The SMS gateway sends each message twice by default

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Customers get two SMS messages

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