Task failures resume from checkpoint instead of restarting entire workflow

When individual tasks fail due to external system failures, incorrect data inputs, or code bugs, Luigi's checkpointing system allows the workflow to resume from the point of interruption rather than restarting the entire pipeline.

Design tasks to be idempotent to support safe retries. Leverage checkpointing for expensive computational tasks to minimize wasted resources. Configure automatic retry policies for transient failures. Verify task outputs are properly defined to enable checkpoint detection.