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https://issues.apache.org/jira/browse/AIRFLOW-5796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17001980#comment-17001980
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ASF GitHub Bot commented on AIRFLOW-5796:
-----------------------------------------
stale[bot] commented on pull request #6451: [AIRFLOW-5796] Fix case when
slot_pool relation is missing
URL: https://github.com/apache/airflow/pull/6451
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> Error in SubdagOperator when resetting DB
> -----------------------------------------
>
> Key: AIRFLOW-5796
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5796
> Project: Apache Airflow
> Issue Type: Improvement
> Components: operators
> Affects Versions: 2.0.0, 1.10.6
> Reporter: Jarek Potiuk
> Priority: Major
>
> There is an error when resetting DB. The migration here:
> *cc1e65623dc7_add_max_tries_column_to_task_instance.py*.
> Which reads DagBag and when reading the DagBag "cannot import
> tests/dags/test_clear_subdag.py" with the root cause:
> *psycopg2.ProgrammingError: relation "slot_pool" does not exist*
> *LINE 2: FROM slot_pool*
> The problem is that SubDagOperator relies on slot_pool relation being present
> but it's not yet ready (because it is added in one of the later migrations).
> It does not cause big problems (the error is caught and ignored and migration
> continue), however it's not really nice to see such error.
>
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