[GitHub] [airflow] lidalei commented on a change in pull request #21170: Add a note about broken DAG dependency graph

[GitBox <gi...@apache.org>]

lidalei commented on a change in pull request #21170:
URL: https://github.com/apache/airflow/pull/21170#discussion_r817736495



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File path: docs/apache-airflow/concepts/dags.rst
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@@ -713,7 +713,8 @@ Additional difficulty is that one DAG could wait for or trigger several runs of
 with different data intervals. The **Dag Dependencies** view
 ``Menu -> Browse -> DAG Dependencies`` helps visualize dependencies between DAGs. The dependencies
 are calculated by the scheduler during DAG serialization and the webserver uses them to build
-the dependency graph.
+the dependency graph. Note that if a DAG depends on another DAG which does not exist (for example a deleted DAG),
+the webserver will fail to render the dependency graph.

Review comment:
       I would like to. But it will take me quite some time to understand the code and create a PR. Considering the severity of the issue, I guess that's fine.




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