What are common failure modes of Kafka Exactly-Once Semantics?

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Quick interview answer

Common failures around Kafka Exactly-Once Semantics: blocking the hot path, ignoring backpressure, and weak timeout/retry design. Assuming EOS covers DB update without idempotency key.

Detailed answer

Failure modes for Kafka Exactly-Once Semantics: Known pitfalls: Assuming EOS covers DB update without idempotency key. • Missing timeouts / unbounded retries • No backpressure when downstream slows • Assuming ordering/guarantees the runtime does not provide How seniors prevent them: Outbox table + relay; idempotency keys on consumers. Parent context: Baseline: Idempotent producer + transactional writes (read-process-write in one transaction) give EOS within Kafka. End-to-end EOS needs idempotent sinks or outbox pattern.

Full explanation

Name concrete failure modes and the mitigation for each — that scores higher than a vague “it can fail.” Idempotent producer + transactional writes (read-process-write in one transaction) give EOS within Kafka. End-to-end EOS needs idempotent sinks or outbox pattern.

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Parent context — Kafka Exactly-Once Semantics

Baseline: Idempotent producer + transactional writes (read-process-write in one transaction) give EOS within Kafka. End-to-end EOS needs idempotent sinks or outbox pattern.

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