Xiaodong DENG created AIRFLOW-2839:
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Summary: Answer a question in doc: what if I have connections with
the same conn_id in both metadata and environment variables?
Key: AIRFLOW-2839
URL: https://issues.apache.org/jira/browse/AIRFLOW-2839
Project: Apache Airflow
Issue Type: Improvement
Components: configuration, Documentation
Reporter: Xiaodong DENG
Assignee: Xiaodong DENG
We can define connections either in metadata database or environment variables.
However, how about there are connections with the same conn_id in both metadata
database and environment variables? Will one of them be picked? Which one? Or a
random one will be picked?
The answer is: Airflow will check environment variables
first.[https://github.com/apache/incubator-airflow/blob/master/airflow/hooks/base_hook.py#L70]
The "random picking" mechanism will only be applicable for multiple
connections with the same conn_id in metadata database (if there is no
connection with the same conn_id defined in environment variables).
This should be made clear in the documentation.
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