mongakshay removed a comment on issue #13542:
URL: https://github.com/apache/airflow/issues/13542#issuecomment-892630614
I am also noticing this issue with my Airflow v2.1.2 instance, where the
task is forever in queued state, and in the scheduler log I see
```
airflow-scheduler1_1 | [2021-08-04 12:45:23,286] {base_executor.py:85}
ERROR - could not queue task TaskInstanceKey(dag_id='example_complex',
task_id='create_tag_template_result2', execution_date=datetime.datetime(2021,
8, 3, 22, 39, 34, 577031, tzinfo=Timezone('UTC')), try_number=1)
```
When I sent the SIGUSR2 signal to scheduler I received:
```
airflow-scheduler1_1 | SIGUSR2 received, printing debug
airflow-scheduler1_1 |
--------------------------------------------------------------------------------
airflow-scheduler1_1 | [2021-08-04 13:07:37,230] {base_executor.py:305}
INFO - executor.queued (0)
airflow-scheduler1_1 |
airflow-scheduler1_1 | [2021-08-04 13:07:37,231] {base_executor.py:307}
INFO - executor.running (1)
airflow-scheduler1_1 | TaskInstanceKey(dag_id='example_complex',
task_id='create_tag_template_result2', execution_date=datetime.datetime(2021,
8, 3, 22, 39, 34, 577031, tzinfo=Timezone('UTC')), try_number=1)
airflow-scheduler1_1 | [2021-08-04 13:07:37,233] {base_executor.py:311}
INFO - executor.event_buffer (0)
airflow-scheduler1_1 |
airflow-scheduler1_1 | [2021-08-04 13:07:37,234] {celery_executor.py:372}
INFO - executor.tasks (1)
airflow-scheduler1_1 | (TaskInstanceKey(dag_id='example_complex',
task_id='create_tag_template_result2', execution_date=datetime.datetime(2021,
8, 3, 22, 39, 34, 577031, tzinfo=Timezone('UTC')), try_number=1), <AsyncResult:
1ed20983-dbd3-47c6-8404-345fa0fb75ff>)
airflow-scheduler1_1 | [2021-08-04 13:07:37,235] {celery_executor.py:377}
INFO - executor.adopted_task_timeouts (0)
```
So basically it is trying to queue a running task ? and failing the `if`
check
```
if task_instance.key not in self.queued_tasks and task_instance.key
not in self.running:
self.log.info("Adding to queue: %s", command)
self.queued_tasks[task_instance.key] = (command, priority,
queue, task_instance)
else:
self.log.error("could not queue task %s", task_instance.key)
```
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