🗓️ 15012025 1021
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stream_processing_semantics
- Refer to the guarantees a stream processing system provides regarding the processing of events in a data stream
- Define how the system behaves during:
- Normal conditions
- During failures, ensuring data is processed correctly
Types
| Semantics | Description | Use Case |
|---|---|---|
| At-Most-Once | Events are processed at most once. If a failure occurs, some events may be lost. | Low-latency systems where occasional data loss is acceptable (e.g., real-time monitoring dashboards). |
| At-Least-Once | Events are processed at least once. Duplicates may occur if a failure happens. | Applications where occasional duplication is acceptable (e.g., logging systems). |
| Exactly-Once | Events are processed exactly once, ensuring no data is lost or duplicated, even in case of failures. | Critical systems like payment processing, billing, or fraud detection. |