jedcunningham commented on a change in pull request #17719:
URL: https://github.com/apache/airflow/pull/17719#discussion_r701396620
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File path: UPDATING.md
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@@ -228,6 +228,14 @@ Now that the DAG parser syncs DAG permissions there is no
longer a need for manu
In addition, the `/refresh` and `/refresh_all` webserver endpoints have also
been removed.
+### TaskInstances now *require* a DagRun
+
+Under normal operation every TaskInstance row in the database would have
DagRun row too, but it was possible to manually delete the DagRun and Airflow
would still execute the TaskInstances.
+
+In Airflow 2.2 we have changed this and now there is a database-level foreign
key constraint ensuring that every TaskInstance has a DagRun row.
+
+Before updating to this 2.2 release you will have to manually resolve any
inconsistencies (add back DagRun rows, or delete TaskInstances) if you have any
"dangling" TaskInstance" rows.
+
Review comment:
Should we also mention that `clean_tis_without_dagrun_interval` has been
removed?
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