nicolasdonoso opened a new issue #14586:
URL: https://github.com/apache/airflow/issues/14586
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**Apache Airflow version**: 2.0.1
**Kubernetes version (if you are using kubernetes)** (use `kubectl
version`): 1.18.15
**Environment**:
- **Cloud provider or hardware configuration**: AWS
- **OS** (e.g. from /etc/os-release): ubuntu 18.04
- **Kernel** (e.g. `uname -a`): Linux
mlb-airflow-infra-workers-75f589bcd9-wtls8 4.9.0-9-amd64 #1 SMP Debian
4.9.168-1 (2019-04-12) x86_64 x86_64 x86_64 GNU/Linux
- **Install tools**:
- **Others**:
**What happened**:
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Scheduler is constantly restarting due to this error:
```
[2021-03-03 17:31:19,393] {scheduler_job.py:1298} ERROR - Exception when
executing SchedulerJob._run_scheduler_loop
Traceback (most recent call last):
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1280, in _execute
self._run_scheduler_loop()
File
"/usr/local/lib/python3.6/dist-packages/airflow/jobs/scheduler_job.py", line
1384, in _run_scheduler_loop
self.executor.heartbeat()
File
"/usr/local/lib/python3.6/dist-packages/airflow/executors/base_executor.py",
line 162, in heartbeat
self.sync()
File
"/usr/local/lib/python3.6/dist-packages/airflow/executors/celery_executor.py",
line 340, in sync
self.update_all_task_states()
File
"/usr/local/lib/python3.6/dist-packages/airflow/executors/celery_executor.py",
line 399, in update_all_task_states
state_and_info_by_celery_task_id =
self.bulk_state_fetcher.get_many(self.tasks.values())
File
"/usr/local/lib/python3.6/dist-packages/airflow/executors/celery_executor.py",
line 552, in get_many
result = self._get_many_from_db_backend(async_results)
File
"/usr/local/lib/python3.6/dist-packages/airflow/executors/celery_executor.py",
line 570, in _get_many_from_db_backend
task_cls = app.backend.task_cls
AttributeError: 'DatabaseBackend' object has no attribute 'task_cls'
[2021-03-03 17:31:20,396] {process_utils.py:100} INFO - Sending
Signals.SIGTERM to GPID 3852
[2021-03-03 17:31:20,529] {process_utils.py:66} INFO - Process
psutil.Process(pid=3996, status='terminated', started='17:31:19') (3996)
terminated with exit code None
[2021-03-03 17:31:20,533] {process_utils.py:66} INFO - Process
psutil.Process(pid=3997, status='terminated', started='17:31:19') (3997)
terminated with exit code None
[2021-03-03 17:31:20,533] {process_utils.py:206} INFO - Waiting up to 5
seconds for processes to exit...
[2021-03-03 17:31:20,540] {process_utils.py:66} INFO - Process
psutil.Process(pid=3852, status='terminated', exitcode=0, started='17:31:13')
(3852) terminated with exit code 0
[2021-03-03 17:31:20,540] {scheduler_job.py:1301} INFO - Exited execute loop
```
**What you expected to happen**: Scheduler running
<!-- What do you think went wrong? -->
**How to reproduce it**:
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**Anything else we need to know**:
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