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What does exactly-once processing require in a streaming system?

A Coordinated offset management and idempotent or transactional writes to the sink
B A single consumer
C Disabling retries
D Synchronous processing

Answer

Coordinated offset management and idempotent or transactional writes to the sink

At-least-once delivery plus idempotent writes achieves the same practical outcome and is often simpler to implement.

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