System Design

Zero-Data-Loss Outbox Pattern with Debezium CDC

System Design diagram · made in Skemio

Transactional Outbox Pattern architecture showing app committing to Orders and Outbox table, Debezium reading Postgres WAL, and streaming to Kafka.
Transactional Outbox Pattern architecture showing app committing to Orders and Outbox table, Debezium reading Postgres WAL, and streaming to Kafka.
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What it shows

  • Business state and outbox events commit together in a single DB txn.
  • Debezium reads the database WAL without adding overhead to app logic.
  • Message broker guarantees at-least-once delivery downstream reliably.

The takeaway

Write events directly to your local database transaction log to avoid dual-write bugs.

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