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Consider this DAG for a dbt project. You have configured your environment to use one thread. When running dbt run, you determine that model_d fails to materialize. How will changing the command from dbt run to dbt run --fail-fast impact the execution of dbt run when model_d fails to materialize? Choose 1 option. Options:
Correct Answer: D
The --fail-fast flag changes dbt's execution behavior by immediately stopping the scheduling of any further models as soon as the first failure occurs. This is true regardless of the number of threads; in this case, the environment uses one thread, meaning models run strictly in sequence based on dependency order. In the DAG provided, model_d is downstream of model_b, and model_f depends on model_d. The execution sequence when using a single thread would be something like: * model_a runs * model_c runs * model_e runs * model_b runs * model_d runs # fails Once model_d fails: * With normal dbt run, dbt would attempt to continue running any unrelated models (though in this DAG, there are no more independent nodes left anyway). * With --fail-fast, dbt immediately stops scheduling any additional work, halting the run. Therefore, no further models-including model_f or any other-will run. dbt does not drop models, retry them, or attempt related branches. It simply stops.
