SCHEDULED TASKS ARE STUCK IN THE STATE OF "RUNNING"

[iremonur]

Hi,

I am trying to schedule 4 tasks to be 10 minutes between each other, I want the first task to start at 19:20.
In the dag code (located in ~/airflow/dags/example_v6.py), I set:
-> start_date=datetime.datetime(2021, 4, 4, 19, 20)
-> schedule_interval= '*/10 * * * *'
The first task is succeeded but the other three of them are stuck in the state of "running".
Some of the parameters I set in the dag code :
default_args = {
'owner': 'airflow',
'depends_on_past': False,
'wait_for_downstream' : False,
'email': ['airflow@example.com'],
'email_on_failure': False,
'email_on_retry': False,
'retries': 1,
'retry_delay': timedelta(minutes=5),
}

I run these commands to schedule the dag:
$ python ~/airflow/dags/example_v6.py
$ airflow db init
$ airflow dags backfill dag_v6 -s 2021-04-04-19:20 -e 2021-04-04-19:50

I got these messages from the terminal:

Apache Airflow version: v2.0.1
Kubernetes is not used.
I use the SequentialExecutor.

Environment:

• GPU : NVIDIA Quadro K3100M
• OS: Ubuntu 18.04
• Python 3.7.3

At the UI, the tasks are listed as:

I would be very glad if you help me with this.

[boring-cyborg]

Thanks for opening your first issue here! Be sure to follow the issue template!

[parkyo]

I found this issue on ovio.org and would love to contribute!

[iremonur]

Thank you, it would be great ! Could you share the link related to the issue ?

[iremonur]

Actually, I tried to schedule another task to be 10 minutes between each other, I want the first task to start at 20.00.
In the dag code (located in ~/airflow/dags/tutorial_v2.py), I set:
-> start_date=datetime.datetime(2021, 4, 4, 19, 50)
-> schedule_interval= '*/10 * * * *'
Some of the parameters I set in the dag code :
default_args = {
'owner': 'airflow',
'depends_on_past': False,
'wait_for_downstream' : False,
'email': ['airflow@example.com'],
'email_on_failure': False,
'email_on_retry': False,
'retries': 1,
'retry_delay': timedelta(minutes=5),
}

I run these commands to schedule the dag:
$ python ~/airflow/dags/tutorial_v2.py
$ airflow db init
$ airflow dags backfill tutorial_v2 -s 2021-04-04-19:50 -e 2021-04-06
NOTE: When I run these commands, the date of the database was: 4 April 2021 / 19:57.
Some of the tasks at the beginning are stuck in the state of "running" :

I don't understand why the scheduler skip some of the tasks, I would be very glad if you help me with this.

Apache Airflow version: v2.0.1
Kubernetes is not used.
I use the SequentialExecutor.

Environment:

GPU : NVIDIA Quadro K3100M
OS: Ubuntu 18.04
Python 3.7.3

[hafid-d]

Any update on this ? Facing the same issue!

[eladkal]

If someone is experiencing similar issue with latest airflow version please comment and share reproduce steps

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