We discuss the second factor of Hasura’s 3factor app, Reliable Eventing, as Allen says he still _surfs_ the Internet (but really, does he?), it’s never too late for pizza according to Joe, and Michael wants to un-hear things.
This episode’s full show notes can be found at https://www.codingblocks.net/episode116, just in case you’re using your podcast player to read this.
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The Second Factor – Reliable Eventing
- Don’t allow for mutable state. Get rid of in memory state manipulation in APIs.
- Persist everything in atomic events.
- The event system should have the following characteristics:
- Atomic – the entire operation must succeed and be isolated from other operations.
- Reliable – events should be delivered to subscribers at least once.
Comparing the 3factor app Eventing to Traditional Transactions
| Traditional application | 3factor application |
| Request is issued, data loaded from various storage areas, apply business logic, and finally commit the data to storage. | Request is issued and all events are stored individually. |
| Avoid using async features because it’s difficult to rollback when there are problems. | Due to the use of the event system, async operations are much easier to implement. |
| Have to implement custom recovery logic to rewind the business logic. | Recovery logic isn’t required since the events are atomic. |
Benefits of an Immutable Event Log
- Primary benefit is simplicity when dealing with recovery. There’s no custom business logic because all the event data is available for replayabili
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