Answer
Write outgoing events inside the same DB transaction, then a background worker reads and publishes them reliably to avoid lost messages.
Quick Answer
Transactional outbox: within a database transaction, write both the business data and an outbox message record atomically. A separate relay process polls the outbox table and publishes messages to Kafka/RabbitMQ, then marks them as sent. This guarantees exactly-once message delivery aligned with database writes — no lost messages even on crash.
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