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https://issues.apache.org/jira/browse/AIRFLOW-2839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569533#comment-16569533
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ASF subversion and git services commented on AIRFLOW-2839:
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Commit c0c63ae2a495b8f808c36acc35d752e916393954 in incubator-airflow's branch
refs/heads/master from Xiaodong
[ https://gitbox.apache.org/repos/asf?p=incubator-airflow.git;h=c0c63ae ]
[AIRFLOW-2839] Refine Doc Concepts->Connections (#3678)
> 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
> Priority: Critical
> Fix For: 2.0.0
>
>
> 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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