Event Sourcing

Synchronizing data using event sourcing

Event sourcing is another approach for data synchronization. It writes any update operations to an append-only event log. The interested applications consume events from this log and store the associated data in their preferred datastore. The current state of the system can be derived simply by consuming all the events from the beginning of the log.

However, applications typically save periodical snapshots (also known as checkpoints) of the state to avoid having to re-consume the whole log in case of failures. In this case, an application that recovers from a failure only needs to replay the events of the log after the latest snapshot.