Guru Devanla created AIRFLOW-5539:
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Summary: default_args dictionary is mutated when passed as
arugment to Airflow
Key: AIRFLOW-5539
URL: https://issues.apache.org/jira/browse/AIRFLOW-5539
Project: Apache Airflow
Issue Type: Bug
Components: DAG
Affects Versions: 1.10.3
Environment: Python 3.7.4, Linux
Reporter: Guru Devanla
The `default_args` argument is a dictionary that can be passed into the DAG
constructor while constructing a dag. But, using the same variable to
construct multiple DAGS breaks, since the `default_args` argument is mutated.
Here is a minimal example:
{code:java}
// code placeholder
In [19]: from functools import partial
In [20]:
default_args=dict(start_date=datetime.datetime(2019, 8, 1))
In [21]: default_dag=partial(DAG, dag_id='test',
default_args=default_args)
In [23]: default_args['start_date'].tzinfo is None
Out[23]: True
In [24]: d1=default_dag() # construct the DAG.
# Now check the value in default_args.
In [25]: default_args['start_date'].tzinfo
is None
Out[25]: False
In [26]:
{code}
My guess is that the deepcopy call to copy default_args is not working properly.
I am using Python 3.7.4.
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