At-Least-Once Delivery and Idempotent Consumers

At-Least-Once Delivery and Idempotent Consumers

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1Order Lifecycle Boundaries: Synchronous Requests vs Asynchronous Events 2Order Event Taxonomy and the One-Page Event Catalog

3Stateless Invocations and Externalized State Rules 4Using the Lambda Duration Limit to Split Work 5Idempotency Under Duplicates and Retries 6Minimal Order Handler Contract: Inputs, Outputs, Success 7Failure Posture: Logging, Correlation, and Error Signaling

8Designing Many-to-Many Routing With an Event Bus 9When to Use EventBridge Pipes Instead of an Event Bus 10Designing a Pipe-to-Bus Composition 11Producing the Orders Routing Diagram 12Failure and Duplication Assumptions at the Routing Layer

13SQS Message Lifecycle for Order Workers

14At-Least-Once Delivery and Idempotent Consumers

15Visibility Timeout Failure Modes and Reprocessing Control 16Standard vs FIFO Queues for Order Semantics 17Message Retention, Backlog Tolerance, and Replay Windows 18Dead-Letter Queues as Failure Isolation and Evidence

19Step Functions Concepts Mapped to the Order Lifecycle 20Choosing Standard vs Express for Order Workflows 21Applying Step Functions Integration Patterns to Order Steps 22Workflow Error-Handling Boundaries With Retry and Catch 23Debugging Duplicates in an Event-Driven Order Pipeline 24Runbook-Driven Diagnosis of Stuck Executions and Backlog Growth

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Production-Ready AWS Event-Driven Order Processing
At-Least-Once Delivery and Idempotent Consumers