CDC with Debezium

Why CDC

Change-Data-Capture (Debezium) tails the database's transaction log (MySQL binlog, Postgres WAL, SQL Server CDC tables) and emits one Kafka record per row change. Benefits over dual-writes:

• No outbox needed for read-only consumers — the DB is the source of truth.
• Atomic with the transaction (you can't drift).
• Replay from any LSN — perfect for rebuilding caches, search indexes, vector stores.

Pair with the outbox pattern when you need to emit domain events (not raw row changes) atomically with state writes.

Publish row-level changes from the acme.orders table into Kafka. Include snapshot mode, key-converter, and Debezium's standard unwrap SMT so consumers see the latest row state, not the envelope.