Debezium

Debezium is a Red Hat-sponsored open-source project that has become the de facto CDC primitive for teams building event-driven and streaming data architectures. It connects to database transaction logs (MySQL binlog, PostgreSQL WAL, SQL Server CDC, Oracle LogMiner, MongoDB oplog) and publishes row-level change events to Kafka topics via Kafka Connect. For teams that need real-time database replication without polling, Debezium is the most widely deployed open-source option.

The appeal is architectural: Debezium integrates cleanly with the Kafka ecosystem, enabling downstream consumers (Flink, ksqlDB, Spark Streaming, warehouse connectors) to process change events at sub-second latency. It covers all major relational databases and MongoDB, handles initial snapshots for existing data, and produces well-structured change event schemas. The Red Hat backing and large community mean active maintenance and connector quality that exceeds most commercial CDC alternatives for supported databases.

The operational complexity is significant and consistently flagged by practitioners. Running Debezium in production requires Kafka (or a Kafka-compatible broker), Kafka Connect infrastructure, schema registry, and DBA cooperation for log retention configuration. Connector restarts during peak traffic periods can trigger multi-hour backlog recovery windows. Teams without existing Kafka expertise face a steep ramp — the three-hop architecture (database log → Kafka Connect → Kafka → sink) introduces multiple failure surfaces and observability gaps that managed alternatives eliminate.