Reliability Guarantees

What is Guaranteed

• At-least-once delivery: Records will be processed at least once
• Ordering per key: Records with the same key are processed in order
• Failure recovery: System failures don't result in lost records
• Horizontal scalability: Multiple instances process different partitions
• Consistency: Database transactions ensure data integrity
• Automatic retry: Failed records are automatically retried
• Automatic rebalancing: Partitions redistribute on topology changes
• Linear scaling: Performance scales with instance count

What is NOT Guaranteed

• Exactly-once delivery: Records may be processed multiple times (handlers should be idempotent)
• Global ordering: No ordering guarantee across different keys
• Real-time processing: Records are processed asynchronously with configurable delays

Next Steps

Ready to get started? Check out the Quick Start Guide to integrate Namastack Outbox for Spring Boot into your application.