hard20 pts · first answer countskafkaflinkdelivery-semantics

Exactly-once writes from Flink to Kafka

A Flink job writes to a Kafka topic with DeliveryGuarantee.EXACTLY_ONCE. How does the sink avoid duplicates after a failure?

A.It uses Kafka transactions committed when a checkpoint completesB.It removes duplicates by scanning the output topicC.It waits for downstream consumers to confirm each recordD.It writes every record twice and keeps the second

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Exactly-once writes from Flink to Kafka

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