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Posted to commits@airflow.apache.org by "Igor Khrol (Jira)" <ji...@apache.org> on 2019/11/22 13:44:00 UTC

[jira] [Created] (AIRFLOW-6043) `Dag.sub_dag` method keeps references to origin dag

Igor Khrol created AIRFLOW-6043:
-----------------------------------

             Summary: `Dag.sub_dag` method keeps references to origin dag
                 Key: AIRFLOW-6043
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-6043
             Project: Apache Airflow
          Issue Type: Bug
          Components: core, DAG
    Affects Versions: 1.10.6
            Reporter: Igor Khrol
            Assignee: Igor Khrol


```

t1 = DummyOperator(task_id="t1", dag=DAG)
t2 = DummyOperator(task_id="t2", dag=DAG)
t3 = DummyOperator(task_id="t3", dag=DAG)
t1 >> t2
t2 >> t3

```

Graph view is broken for such DAG if `root=t2`.

The root cause of the problem is with `sub_dag` method. `t2` task of subdag when taken from `t1` still has a reference to `t3`.



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