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https://issues.apache.org/jira/browse/AIRFLOW-1011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15932116#comment-15932116
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Ruslan Dautkhanov commented on AIRFLOW-1011:
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AIRFLOW-1014 might be related or caused by the same root cause.
> Task Instance Results not stored for SubDAG Tasks
> -------------------------------------------------
>
> Key: AIRFLOW-1011
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1011
> Project: Apache Airflow
> Issue Type: Bug
> Components: backfill, subdag
> Affects Versions: Airflow 1.8
> Reporter: Joe Schmid
> Priority: Critical
> Attachments: 1-TopLevelDAGTaskInstancesShownCorrectly.png,
> 2-ZoomedSubDAG-NoTaskInstances-v1.8.png,
> 3-ZoomedSubDAG-TaskInstances-v1.7.1.3.png, test_subdag.py
>
>
> In previous Airflow versions, results for tasks executed as a subdag were
> written as rows to task_instances. In Airflow 1.8 only rows for tasks inside
> the top-level DAG (non-subdag tasks) seem to get written to the database.
> This results in being unable to check the status of task instances inside the
> subdag from the UI, check the logs for those task instances from the UI, etc.
> Attached is a simple test DAG that exhibits the issue along with screenshots
> showing the UI differences between v1.8 and v1.7.1.3.
> Note that if the DAG is run via backfill from command line (e.g. "airflow
> backfill Test_SubDAG -s 2017-03-18 -e 2017-03-18") the task instances show up
> successfully.
> Also, we're using CeleryExecutor and not specifying a different executor for
> our subdags.
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