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https://issues.apache.org/jira/browse/AIRFLOW-4070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795750#comment-16795750
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ASF GitHub Bot commented on AIRFLOW-4070:
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XD-DENG commented on pull request #4904: [AIRFLOW-4070] AirflowException ->
log.warning for duplicate task dependencies
URL: https://github.com/apache/airflow/pull/4904
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> AirflowException on repeated dependencies prevents automated dependencies
> -------------------------------------------------------------------------
>
> Key: AIRFLOW-4070
> URL: https://issues.apache.org/jira/browse/AIRFLOW-4070
> Project: Apache Airflow
> Issue Type: Bug
> Reporter: Newton Le
> Assignee: Newton Le
> Priority: Major
>
> We are trying to build automated dependencies based on data. For example, if
> Task A requires data from Task B, then a task dependency will be
> automatically generated. At the same time, we still want to allow users to
> specify explicit dependencies, e.g. `task_a >> task_b`.
> Airflow's current way of raising an exception on duplicate dependencies
> currently blocks this implementation. Also, I can't think of a good
> justification for it. For the purposes I can imagine, logging a warning seems
> more than sufficient.
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