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https://issues.apache.org/jira/browse/AIRFLOW-3543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16779404#comment-16779404
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ASF subversion and git services commented on AIRFLOW-3543:
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Commit 078ff765dbde1a47a0f9bcbd605c711e96201f79 in airflow's branch
refs/heads/master from Stefan Seelmann
[ https://gitbox.apache.org/repos/asf?p=airflow.git;h=078ff76 ]
AIRFLOW-3543: Fix deletion of DAG with rescheduled tasks (#4646)
> rescheduled tasks block DAG deletion
> ------------------------------------
>
> Key: AIRFLOW-3543
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3543
> Project: Apache Airflow
> Issue Type: Bug
> Components: cli, database
> Environment: postgres 10 database
> Reporter: Christopher
> Assignee: Stefan Seelmann
> Priority: Critical
>
> This applies to current master branch after
> [AIRFLOW-2747|https://github.com/apache/incubator-airflow/commit/dc59d7e2750aa90e099afad8689f2646f18f92a6]
> was merged.
> Once a sensor task is rescheduled, the task cannot be deleted from the DB due
> to a foreign key constraint. This prevents deletion of tasks and DAGS. This
> occurs regardless of whether the DAG is still running or whether the sensor
> is actually rescheduled to run in the future or not (ie the task may complete
> successfully but its entry still resides as a row in the task_reschedule
> table.
>
> I am running a postgres-backed airflow instance.
>
> {{Traceback (most recent call last):}}
> {{ File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py",
> line 1193, in _execute_context}}
> {{context)}}}}
> {{File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py",
> line 509, in do_execute}}}}
> {{cursor.execute(statement, parameters)}}
> {{psycopg2.IntegrityError: update or delete on table "task_instance" violates
> foreign key constraint "task_reschedule_dag_task_date_fkey" on table
> "task_reschedule"}}
> {{DETAIL: Key (task_id, dag_id, execution_date)=(check_images_ready_11504,
> flight5105_v0.0.1, 2018-12-13 00:00:00+00) is still referenced from table
> "task_reschedule".}}
> {{sqlalchemy.exc.IntegrityError: (psycopg2.IntegrityError) update or delete
> on table "task_instance" violates foreign key constraint
> "task_reschedule_dag_task_date_fkey" on table "task_reschedule"}}
>
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