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Answer by Chris Halcrow for Effective strategy to avoid duplicate messages in apache kafka consumer

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There's a relatively new 'Transactional API' now in Kafka that can allow you to achieve exactly once processing when processing a stream. With the transactional API, idempotency can be built in, as long as the remainder of your system is designed for idempotency. See https://www.baeldung.com/kafka-exactly-once


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