potiuk edited a comment on pull request #20894:
URL: https://github.com/apache/airflow/pull/20894#issuecomment-1019538985
Yeah. I can confirm that this change has not changed anything, as I
suspected @ephraimbuddy . You can test it yourself. This is what I did (latest
breeze + postgres)
```
export AIRFLOW__CORE__SQL_ALCHEMY_ENGINE_ARGS='{"echo": true}'
```
^^ This enables echo of the queries generated by SQLAlchemy.
```
pytest
tests/jobs/test_scheduler_job.py::TestSchedulerJob::test_dagrun_callbacks_are_called
-s
```
^^ This is one of the tests that reaches this query.
```
UPDATE task_instance SET start_date=%(start_date)s, end_date=%(end_date)s,
duration=%(duration)s, state=%(state)s
WHERE task_instance.dag_id = %(dag_id_1)s AND task_instance.run_id =
%(run_id_1)s AND task_instance.task_id
IN (%(task_id_1)s)
"{'start_date': datetime.datetime(2022, 1, 23, 18, 1, 14, 880695,
tzinfo=Timezone('UTC')),
'end_date': datetime.datetime(2022, 1, 23, 18, 1, 14, 880701,
tzinfo=Timezone('UTC')),
'duration': 0, 'state': <TaskInstanceState.SUCCESS: 'success'>,
'dag_id_1': 'test_task_start_date_scheduling',
'run_id_1': 'scheduled__2016-01-01T00:00:00+00:00', 'task_id_1': 'dummy2'}"
```
^^ This was the query generated (as you can see there is no extra lock
here). To make it easy to find I just added 'raise Exception` right after the
query - this one was the last query printed.
I reverted the commit "Obtain lock for update when scheduling tis" and
re-run it:
```
UPDATE task_instance SET start_date=%(start_date)s, end_date=%(end_date)s,
duration=%(duration)s, state=%(state)s
WHERE task_instance.dag_id = %(dag_id_1)s AND task_instance.run_id =
%(run_id_1)s AND task_instance.task_id
IN (%(task_id_1)s)
{'start_date': datetime.datetime(2022, 1, 23, 18, 11, 22, 12081,
tzinfo=Timezone('UTC')),
'end_date': datetime.datetime(2022, 1, 23, 18, 11, 22, 12087,
tzinfo=Timezone('UTC')),
'duration': 0, 'state': <TaskInstanceState.SUCCESS: 'success'>,
'dag_id_1': 'test_task_start_date_scheduling',
'run_id_1': 'scheduled__2016-01-01T00:00:00+00:00', 'task_id_1': 'dummy2'}
```
^^ As you can see, we have the very same query generated by SQLAlchemy, no
matter if we do the query with/without row lock. Exactly as I suspected. I will
re-open the original error, because IMHO, this change has no chance of fixing
it, because it does not change anything :(.
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