With Kafka Streams you get those and atomicity via Exactly-once-Semantics.
Michał
On 21/07/17 14:51, Chris Richardson wrote:
Hi,
I like Kafka but I don't understand the claim that it can be used for Event
Sourcing (here <http://microservices.io/patterns/data/event-sourcing.html>
and here <https://martinfowler.com/eaaDev/EventSourcing.html>)
One part of the event sourcing is the ability to subscribe to events
published by aggregates and clearly Kafka works well there.
But the other part of Event Sourcing is "database" like functionality,
which includes
- findEventsByPrimaryKey() - needed to be able to reconstruct an
aggregate from its events - the essence of event sourcing
- Atomic updates - for updating aggregates - findEventsByPrimaryKey()
- business logic - insertNewEvents()) in order to handle this kind of
scenario.
The approach we have taken is to implement event sourcing using a database
and Kafka.
For instance: see
https://blog.eventuate.io/2016/10/06/eventuate-local-event-sourcing-and-cqrs-with-spring-boot-apache-kafka-and-mysql/
Chris
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