Definition:Event Sourcing
Event Sourcing captures all changes to application state as a sequence of immutable event objects stored in an append-only log.
Detailed Technical Explanation
Business Perspective
Provides 100% complete audit trails, retroactive state calculation, and compliance ledger integrity for financial and legal systems.
Technical Perspective
Pairs with CQRS pattern, using event streams (Kafka/EventStore) to project read models for fast query execution.
Real-World Example
A banking system tracking every individual credit and debit event to calculate account balance histories deterministically.
Common Architectural Mistakes
- ✗Lacking Event Schema Versioning: Modifying event payload structures without implementing event upcasters for historical logs.
Ecosystem Integration
Engineering Services & Solutions
Technology Hub
Frequently Asked Questions
Event Sourcing vs Traditional CRUD?
CRUD overwrites row state; Event Sourcing appends immutable historical events, maintaining audit history.
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