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Posted to commits@airflow.apache.org by "Newton Le (JIRA)" <ji...@apache.org> on 2019/03/11 17:34:00 UTC

[jira] [Created] (AIRFLOW-4070) AirflowException on repeated dependencies prevents automated dependencies

Newton Le created AIRFLOW-4070:
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             Summary: 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


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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