Checkpointing the Message Processing
8 days ago
- #message-processing
- #checkpointing
- #postgresql
- Checkpointing in message processing is analogous to game checkpoints, allowing resumption from the last processed state.
- The Outbox pattern ensures message processing consistency by storing messages in the same transaction as state updates.
- PostgreSQL is used with a specific table structure for outbox messages, including global ordering and transaction IDs.
- A processor_checkpoints table is introduced to track the last processed message positions for each processor.
- A stored procedure with conditional logic manages checkpoint updates, handling idempotency and detecting competing processors.
- Global ordering guarantees and transactional capabilities are crucial for reliable checkpointing and message processing.
- Tradeoffs include the need for global ordering, transaction support, and potential for reprocessing in failure scenarios.
- Tools like Emmett can abstract away the complexity of implementing checkpointing and message processing logic.