Daniel Huang created AIRFLOW-883:
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Summary: Assigning operator to DAG via bitwise composition does
not pickup default args
Key: AIRFLOW-883
URL: https://issues.apache.org/jira/browse/AIRFLOW-883
Project: Apache Airflow
Issue Type: Bug
Components: models
Reporter: Daniel Huang
Priority: Minor
This is only the case when the operator does not specify {{dag=dag}} and is not
initialized within a DAG's context manager (due to
https://github.com/apache/incubator-airflow/blob/fb0c5775cda4f84c07d8d5c0e6277fc387c172e6/airflow/utils/decorators.py#L50)
Example:
{code}
default_args = {
'owner': 'airflow',
'start_date': datetime(2017, 2, 1)
}
dag = DAG('my_dag', default_args=default_args)
dummy = DummyOperator(task_id='dummy')
dag >> dummy
{code}
This will raise a {{Task is missing the start_date parameter}}. I _think_ this
should probably be allowed because I assume the purpose of supporting {{dag >>
op}} was to allow delayed assignment of an operator to a DAG.
I believe to fix this, on assignment, we would need to go back and go through
dag.default_args to see if any of those attrs weren't explicitly set on
task...not the cleanest.
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