KSQL: Open Source Streaming SQL for Apache Kafka
I've had the question for a while so I'll ask it here, maybe someone can help me.<p>Suppose you modeled your domain with events and your stack is build on top of it. As stuff happens in your application, events are generated and appended to the stream. The stream is consumed by any number of consumers and awesome stuff is produced with it. The stream is persisted and you have all events starting from day 1.<p>Over time, things have changed and you have evolved your events to include some fields and deprecate others. You could do this without any downtime whatsoever by changing your events in a way that is backward compatible way.<p>What is the good approach to what I'd call a `replay`?<p>When you want to replay all events, the version of your apps that will consume the events may not know about the fields that were in the event for day one.