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https://issues.apache.org/jira/browse/AIRFLOW-920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Davydov resolved AIRFLOW-920.
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Resolution: Cannot Reproduce
> Can't mark non-existent tasks as successful from graph view
> -----------------------------------------------------------
>
> Key: AIRFLOW-920
> URL: https://issues.apache.org/jira/browse/AIRFLOW-920
> Project: Apache Airflow
> Issue Type: Sub-task
> Affects Versions: 1.8.0rc4
> Reporter: Dan Davydov
> Assignee: Bolke de Bruin
> Attachments: airflow_code_test_subdag.png,
> airflow_dialog_test_subdag.png, airflow_treeview_test_subdag.png,
> airfow_confirm_test_subdag.png
>
>
> If you want to add a subdag operator with depends on past set to an existing
> dag you need to mark the subdag as successful in the UI in order for it to
> start running. Previously this was possible by mark-successing the
> non-existent task instance/dagrun in the UI via the graph view. Now when you
> try to mark the task successful Airflow gives an empty list of tasks that it
> is going to try to mark successful, probably because the task instance/dagrun
> do not exist.
> Repro steps:
> - Create a DAG with a dummy task
> - Let this DAG run for one dagrun
> - Add a new subdag operator that contains a dummy operator to this DAG that
> has depends_on_past set to true
> - click on the white square for the new subdag operator in the DAGs first
> dagrun
> - Click "Zoom into subdag" (takes you to the graph view for the subdag)
> - Click the dummy task in the graph view and click "Mark Success"
> - Observe that the list of tasks to mark as success is empty (it should
> contain the dummy task)
> [~bolke]
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