Answer
Events are written to an outbox table inside the same DB transaction.
A background process publishes them to the message broker to guarantee consistency.
Quick Answer
Transactional outbox: instead of publishing directly to Kafka (two operations - DB write and message publish can't be atomic), write the event to an "outbox" table in the same DB transaction as your data change. A separate relay process reads the outbox and publishes to Kafka, then marks as published. Guarantees at-least-once event delivery.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ