What is the Transactional Outbox Pattern? | Designing Event-Driven Microservices

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The transactional outbox pattern leverages database transactions to update a microservice's state and an outbox table. Events in the outbox will be sent to an external messaging platform such as Apache Kafka.

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This technique is used to overcome the dual-write problem which occurs when you have to write data to two separate systems such as a database and Apache Kafka. The database transactions can be used to ensure atomic writes between the two tables. From there, a separate process can consume the outbox and update the external system as required.

RELATED RESOURCES
► Eliminating the Double Write Problem in Apache Kafka Using the Outbox Pattern: https://cnfl.io/3UhVbVC
► Incorporating Event Storage: https://cnfl.io/492wmS0
► Microservices: An Introduction https://cnfl.io/3ZMt3up
► Event-Driven Microservices Architecture: https://cnfl.io/48FSYbj
► Migrate from Monoliths to Event-Driven Microservices: https://cnfl.io/3tsqlhu
► Microservices course playlist: https://bit.ly/designing-event-driven...
► Get Started on Confluent Developer: https://cnfl.io/48FnKRB

CHAPTERS
00:00 - Intro
00:23 - What is the dual-write problem?
00:51 - What is the transactional outbox pattern?
01:33 - How can we emit events to Apache Kafka?
01:53 - What tools can be used to process an outbox?
02:49 - What delivery guarantees does the outbox pattern provide?
03:34 - What are the problems with the outbox pattern?
04:40 - Closing

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