turbaszek commented on issue #12783:
URL: https://github.com/apache/airflow/issues/12783#issuecomment-738076275
On of the problems is that scheduler schedule a task two times:
```
[2020-12-03 15:23:03,332] {scheduler_job.py:1066} INFO - Setting the
following tasks to queued state:
<TaskInstance: other_dag.wait-task 2020-12-03 15:22:00+00:00
[scheduled]>
[2020-12-03 15:23:03,336] {scheduler_job.py:1108} INFO - Sending
TaskInstanceKey(dag_id='other_dag', task_id='wait-task',
execution_date=datetime.datetime(2020, 12, 3, 15, 22, tzinfo=Timezone('UTC')),
try_number=1) to executor with priority 1 and queue default
[2020-12-03 15:23:03,337] {base_executor.py:78} DEBUG - TI:
TaskInstanceKey(dag_id='other_dag', task_id='wait-task',
execution_date=datetime.datetime(2020, 12, 3, 15, 22, tzinfo=Timezone('UTC')),
try_number=1) QUEUED: OrderedDict(), RUNNING:
{TaskInstanceKey(dag_id='other_dag', task_id='wait-task',
execution_date=datetime.datetime(2020, 12, 3, 15, 22, tzinfo=Timezone('UTC')),
try_number=1)}
[2020-12-03 15:23:03,338] {base_executor.py:83} ERROR - Could not queue task
TaskInstanceKey(dag_id='other_dag', task_id='wait-task',
execution_date=datetime.datetime(2020, 12, 3, 15, 22, tzinfo=Timezone('UTC')),
try_number=1)
```
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