Event versioning strategies
Now that you understand how events can evolve over time, let’s explore how to manage this evolution effectively. There are several strategies to handle event versioning, each with its own advantages and drawbacks. Before diving into specific solutions, let’s review some fundamental principles that are crucial when working with events:
- Immutability: Events are immutable records of occurrences in the past. Once an event is published, it cannot be altered or removed without compromising the integrity of your system’s history. Instead of modifying an event, you should publish a compensating or corrective event to address any required changes.
- Event handlers: After an event is in production, any changes to its structure or meaning must be managed with caution. If you modify an event or its corresponding handlers, you must consider the impact on historical data. During an event replay, old events will retain their original...
