Debezium

Debezium is an open source project that provides a low latency data streaming platform for change data capture (CDC). Debezium monitors databases, and then applications consume events for each row-level change made to the database. Only committed changes are visible, so connected applications don't have to worry about transactions or changes that are rolled back. Debezium provides a single model of all change events, so a connected application does not have to worry about the intricacies of each kind of database management system. Additionally, since Debezium records the history of data changes in durable, replicated logs, and the application can be stopped and restarted at any time, and it will be able to consume all of the events it missed while it was not running, ensuring that all events are processed correctly and completely.

Monitoring databases and being notified when data changes has always been complicated. Relational database triggers can be useful, but are specific to each database and often limited to updating state within the same database (not communicating with external processes). Some databases offer APIs or frameworks for monitoring changes, but there is no standard so each database's approach is different and requires a lot of knowledged and specialized code. It still is very challenging to ensure that all changes are seen and processed in the same order while minimally impacting the database.

Debezium provides modules that do this. Some modules are generic and work with multiple database management systems, but are also a bit more limited in functionality and performance. Other modules are tailored for specific database management systems, so they are often far more capable and they leverage the specific features of the system.

Debezium is free and open source under the Apache 2.0 license.