Fail-fast
Fail-fast is a design principle that detects and reports errors or invalid conditions immediately instead of continuing with potentially meaningless or unsafe processing.
Unit Testing Principles, Practices, and Patterns
A software design principle that detects and reports invalid conditions as early as possible during execution.
- How it is used
- Uses early failure to shorten debugging feedback and protect application state from corruption.
- How deep it goes
- Explains operation interruption, exceptions, preconditions, configuration validation, and the trade-off with integration tests.
- Examples
- Uses email-change preconditions, controller behavior, and startup configuration validation as concrete examples.
- What you can do after
- Diagnose invalid assumptions earlier and prevent faulty operations from continuing into persistent state.
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Architecting an Apache Iceberg Lakehouse
Fail-fast ingestion rejects records or halts processing when incoming data does not conform to the expected schema.
- How it is used
- Protects ingestion quality by stopping schema-invalid records before they reach Iceberg tables.
- How deep it goes
- Defines rejection and halting behavior, explains tradeoffs, and stops short of prescribing pipeline-specific implementation.
- Examples
- Uses data type mismatches, missing fields, malformed records, and schema inconsistencies as validation cases.
- What you can do after
- Diagnose schema problems earlier and selectively prevent invalid records from entering Iceberg tables.
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Related concepts
- integration testalternative to · An integration test evaluates whether multiple software components, or a component and an external dependency, interact and behave correctly together.
- exceptionuses · An exception is a runtime signal or object representing an abnormal condition that interrupts ordinary program flow and may be handled or propagated.
- preconditionaddresses · A precondition is a condition or requirement that must be satisfied before an operation, process, or action can proceed correctly.
- let it crashcontrasts with · Let it crash is a fault-handling technique in which a failed component terminates rather than attempting local recovery, allowing supervision to restart or replace it.
- blockchainuses · A blockchain is a distributed ledger that records data in an ordered sequence of cryptographically linked, tamper-evident blocks.
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