You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2021/03/03 17:51:58 UTC
[GitHub] [airflow] nicolasdonoso opened a new issue #14586: AttributeError: 'DatabaseBackend' object has no attribute 'task_cls'
nicolasdonoso opened a new issue #14586:
URL: https://github.com/apache/airflow/issues/14586
<!--
Welcome to Apache Airflow! For a smooth issue process, try to answer the following questions.
Don't worry if they're not all applicable; just try to include what you can :-)
If you need to include code snippets or logs, please put them in fenced code
blocks. If they're super-long, please use the details tag like
<details><summary>super-long log</summary> lots of stuff </details>
Please delete these comment blocks before submitting the issue.
-->
<!--
IMPORTANT!!!
PLEASE CHECK "SIMILAR TO X EXISTING ISSUES" OPTION IF VISIBLE
NEXT TO "SUBMIT NEW ISSUE" BUTTON!!!
PLEASE CHECK IF THIS ISSUE HAS BEEN REPORTED PREVIOUSLY USING SEARCH!!!
Please complete the next sections or the issue will be closed.
These questions are the first thing we need to know to understand the context.
-->
**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**:
<!-- (please include exact error messages if you can) -->
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**:
<!---
As minimally and precisely as possible. Keep in mind we do not have access to your cluster or dags.
If you are using kubernetes, please attempt to recreate the issue using minikube or kind.
## Install minikube/kind
- Minikube https://minikube.sigs.k8s.io/docs/start/
- Kind https://kind.sigs.k8s.io/docs/user/quick-start/
If this is a UI bug, please provide a screenshot of the bug or a link to a youtube video of the bug in action
You can include images using the .md style of
To record a screencast, mac users can use QuickTime and then create an unlisted youtube video with the resulting .mov file.
--->
**Anything else we need to know**:
<!--
How often does this problem occur? Once? Every time etc?
Any relevant logs to include? Put them here in side a detail tag:
<details><summary>x.log</summary> lots of stuff </details>
-->
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
[GitHub] [airflow] boring-cyborg[bot] commented on issue #14586: AttributeError: 'DatabaseBackend' object has no attribute 'task_cls'
Posted by GitBox <gi...@apache.org>.
boring-cyborg[bot] commented on issue #14586:
URL: https://github.com/apache/airflow/issues/14586#issuecomment-789933104
Thanks for opening your first issue here! Be sure to follow the issue template!
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
[GitHub] [airflow] mik-laj commented on issue #14586: AttributeError: 'DatabaseBackend' object has no attribute 'task_cls'
Posted by GitBox <gi...@apache.org>.
mik-laj commented on issue #14586:
URL: https://github.com/apache/airflow/issues/14586#issuecomment-791036601
Can you provide the output of the commands below?
```
python -c "from airflow.executors.celery_executor import app; print(type(app.backend))"
<class 'celery.backends.database.DatabaseBackend'>
```
```
pip freeze
```
I suspect you are using an unsupported version of Celery. See: https://github.com/apache/airflow/issues/11301
I recommend that you use constraints during installation. See: http://airflow.apache.org/docs/apache-airflow/stable/installation.html#constraints-files
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
[GitHub] [airflow] kaxil closed issue #14586: AttributeError: 'DatabaseBackend' object has no attribute 'task_cls'
Posted by GitBox <gi...@apache.org>.
kaxil closed issue #14586:
URL: https://github.com/apache/airflow/issues/14586
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org