Solvedairflow Migrate from 2.1.4 to 2.2.0

Apache Airflow version


Operating System


Versions of Apache Airflow Providers




Deployment details

Using airflow-2.2.0python3.7

What happened

Upgrading image from apache/airflow:2.1.4-python3.7
to apache/airflow:2.2.0-python3.7
Cause this inside scheduler, which is not starting:

Python version: 3.7.12
Airflow version: 2.2.0
Node: 6dd55b0a5dd7
Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 1277, in _execute_context
    cursor, statement, parameters, context
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 608, in do_execute
    cursor.execute(statement, parameters)
psycopg2.errors.UndefinedColumn: column dag.max_active_tasks does not exist
LINE 1: ..., dag.schedule_interval AS dag_schedule_interval, dag.max_ac...

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.7/site-packages/flask/", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/airflow/.local/lib/python3.7/site-packages/flask/", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/airflow/.local/lib/python3.7/site-packages/flask/", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/airflow/.local/lib/python3.7/site-packages/flask/", line 39, in reraise
    raise value
  File "/home/airflow/.local/lib/python3.7/site-packages/flask/", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/airflow/.local/lib/python3.7/site-packages/flask/", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/airflow/.local/lib/python3.7/site-packages/airflow/www/", line 51, in decorated
    return func(*args, **kwargs)
  File "/home/airflow/.local/lib/python3.7/site-packages/airflow/www/", line 588, in index
    filter_dag_ids =
  File "/home/airflow/.local/lib/python3.7/site-packages/airflow/www/", line 377, in get_accessible_dag_ids
    return {dag.dag_id for dag in accessible_dags}
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/orm/", line 3535, in __iter__
    return self._execute_and_instances(context)
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/orm/", line 3560, in _execute_and_instances
    result = conn.execute(querycontext.statement, self._params)
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 1011, in execute
    return meth(self, multiparams, params)
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/sql/", line 298, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 1130, in _execute_clauseelement
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 1317, in _execute_context
    e, statement, parameters, cursor, context
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 1511, in _handle_dbapi_exception
    sqlalchemy_exception, with_traceback=exc_info[2], from_=e
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/util/", line 182, in raise_
    raise exception
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 1277, in _execute_context
    cursor, statement, parameters, context
  File "/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/", line 608, in do_execute
    cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.errors.UndefinedColumn) column dag.max_active_tasks does not exist
LINE 1: ..., dag.schedule_interval AS dag_schedule_interval, dag.max_ac...

[SQL: SELECT dag.dag_id AS dag_dag_id, dag.root_dag_id AS dag_root_dag_id, dag.is_paused AS dag_is_paused, dag.is_subdag AS dag_is_subdag, dag.is_active AS dag_is_active, dag.last_parsed_time AS dag_last_parsed_time, dag.last_pickled AS dag_last_pickled, dag.last_expired AS dag_last_expired, dag.scheduler_lock AS dag_scheduler_lock, dag.pickle_id AS dag_pickle_id, dag.fileloc AS dag_fileloc, dag.owners AS dag_owners, dag.description AS dag_description, dag.default_view AS dag_default_view, dag.schedule_interval AS dag_schedule_interval, dag.max_active_tasks AS dag_max_active_tasks, dag.max_active_runs AS dag_max_active_runs, dag.has_task_concurrency_limits AS dag_has_task_concurrency_limits, dag.next_dagrun AS dag_next_dagrun, dag.next_dagrun_data_interval_start AS dag_next_dagrun_data_interval_start, dag.next_dagrun_data_interval_end AS dag_next_dagrun_data_interval_end, dag.next_dagrun_create_after AS dag_next_dagrun_create_after 
FROM dag]
(Background on this error at:

What you expected to happen

Automatic database migration and properly working scheduler.

How to reproduce

Ugrade from 2.1.4 to 2.2.0 with some dags history.

Anything else

No response

Are you willing to submit PR?

  • Yes I am willing to submit a PR!

Code of Conduct

33 Answers

✔️Accepted Answer

SQL we used from our deployment playbook to clean up these tables

Obviously a disclaimer on running this blindly. Validate its rows you can safely remove first by just executing the CTEs


-- Remove dag runs without a valid run_id
DELETE FROM dag_run WHERE run_id is NULL;

-- Remove task fails without a run_id
WITH task_fails_to_remove AS (
    dag_run ON 
    dag_run.dag_id = task_fail.dag_id 
    AND dag_run.execution_date = task_fail.execution_date
    dag_run.run_id IS NULL
    task_fail.dag_id = task_fails_to_remove.dag_id
    AND task_fail.task_id = task_fails_to_remove.task_id
    AND task_fail.execution_date = task_fails_to_remove.execution_date

-- Remove task instances without a run_id
WITH task_instances_to_remove AS (
    ON dag_run.dag_id = task_instance.dag_id
    AND dag_run.execution_date = task_instance.execution_date
    dag_run.run_id is NULL
    task_instance.dag_id = task_instances_to_remove.dag_id
    AND task_instance.task_id = task_instances_to_remove.task_id
    AND task_instance.execution_date = task_instances_to_remove.execution_date


Other Answers:

Seems other people have similar issue #18912 so for me it looks highly unlikely this was manually added.

I think the number of reports we have in such short time (I saw 3 reports already) indicate that those rows can appear frequently as result of normal operations by Airflow, and many users might hve similar issues soon.

If this is realy result of "regular" airflow behaviour, for me it calls for a very quick 2.2.1 with improved migration to handle that case (cc: @kaxil @jedcunningham)

Problem is that there is no clue, which rows need to be deleted. Also there is no straight logic behind "corresponding rows" for me.

This part of code for me is the only source of some guidelines.

If there is better way to deal with this kind of problem in future, I will appreciate to hear it :)

If some references are lost, this kind of error should be repaired automatically IHMO.

What's the reason for those rows to appear in the DB ? How did they get there? Do we know it?

I think there are two possible scenarios:

  1. If it is result of normal operation of Airflow ( even some some special circumstances, manually triggered dags using CLI or UI)

If that's the case, I agree it should be handled better - Airflow cleanig them or adding "fake" run_ids for those during migration is what I would expect as we should handle this as "regular" migration scenario.

  1. They are result of user adding manually entries to the database.

If this is the case then the BEST we could do is to spit-out the exact SQL query to run to delete those rows. We should not delete them automaticaly.

Case 1. Yes, I'm triggering dags manually from UI or by RestApi.
Case 2. That was very first time I had to work with Airflow Database. I have never add or modified it manually.
I'm only reading connection from db.

Case 2. That was very first time I had to work with Airflow Database. I have never add or modified it manually.
I'm only reading connection from db.

Thanks for confirming @sbialkowski-pixel! @kaxil @jedcunningham I think we need to seriously consider 2.2.1

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