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https://issues.apache.org/jira/browse/AIRFLOW-6043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986033#comment-16986033
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ASF subversion and git services commented on AIRFLOW-6043:
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Commit 6fbe6831251dea1294db31a9d0694491f5f57399 in airflow's branch
refs/heads/master from Igor Khrol
[ https://gitbox.apache.org/repos/asf?p=airflow.git;h=6fbe683 ]
[AIRFLOW-6043] Fix bug in UI when "filtering by root" to display section of dag
(#6638)
Graph UI is broken when tasks are filtered by root if
root is in the middle of chain of tasks.
The initial of the problem is in `sub_dag` method that keeps references
to the original DAG. `deepcopy` call is optimized and the optimization is
not 100% correct.
> `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
> Priority: Major
> Fix For: 1.10.7
>
>
> ```
> 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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