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Posted to commits@airflow.apache.org by GitBox <gi...@apache.org> on 2021/02/10 01:12:47 UTC
[GitHub] [airflow] gschwim opened a new issue #14162: Example tutorial_taskflow_api_etl crashes w/ AttributeError: Can't pickle local object
gschwim opened a new issue #14162:
URL: https://github.com/apache/airflow/issues/14162
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**Apache Airflow version**: from the docker-compose file in the tutorial, image apache/airflow:master-python3.8 and apache/airflow:master-python3.7
**Kubernetes version (if you are using kubernetes)** (use `kubectl version`): n/a
**Environment**:
- **Cloud provider or hardware configuration**: Bare metal server in lab, AMD threadripper, 64GB ram
- **OS** (e.g. from /etc/os-release): Ubuntu 18.04.5 LTS BIONIC VM running atop KVM
- **Kernel** (e.g. `uname -a`): Linux zxdev01 4.15.0-135-generic #139-Ubuntu SMP Mon Jan 18 17:38:24 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
- **Install tools**: docker-compose as provided in airflow tutorial w/ mods as above
- **Others**: set up per the tutorial [here](https://airflow.apache.org/docs/apache-airflow/stable/start/docker.html)
**What happened**:
Running a version of the included example tutorial dag _taskflow_api_etl_ that is set to be on a schedule causes a crash
`
docker exec -ti airflow_airflow-webserver_1 airflow dags backfill test_tutorial_taskflow_api_etl --start-date <any date> --end-date <any date>
`
The following error is received:
`
AttributeError: Can't pickle local object 'test_tutorial_taskflow_api_etl.<locals>.transform'
`
Modifications to this dag, including removing the return values from each function and the parameters in each, yield identical results. Running a single day backfill does *not* cause this crash. Deleting the dag and letting it re-import does not help.
<!-- (please include exact error messages if you can) -->
**What you expected to happen**:
The dag should complete the backfill for all days. I removed the return statement in all functions, and removed the parameters in each of the function definitions thinking this had to do with the passing along of return results but this did not help.
I tested with multiple workers and a single worker as well as with python 3.7. The same result was achieved in all cases.
<!-- What do you think went wrong? -->
**How to reproduce it**:
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1. Install an ubuntu VM, versions as specified, 8GB ram, 4 cores
2. Install Docker CE from the docker repositories per their installation directions
3. Download the Airflow docker-compose image, perform the tutorial set up tasks, modify only the airflow image as noted in the versions above (this is a different bug maybe, default causes a crash).
4. `docker-compose up -d`
5. Copy the code in tutorial_taskflow_api_etl, modify to set the schedule_interval to daily, save into ./dags/test.py and let airflow discover it.
6. execute `docker exec -ti airflow_airflow-webserver_1 airflow dags backfill test_tutorial_taskflow_api_etl --start-date <any date> --end-date <any date>`
**Anything else we need to know**:
At least two other dag examples appear to work just fine when executed this way. Neither are using the Taskflow API. Maybe that is a contributing factor.
This crash occurs consistently at every run as described.
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<details><summary>crash output</summary>/home/airflow/.local/lib/python3.8/site-packages/airflow/cli/commands/dag_command.py:60 PendingDeprecationWarning: --ignore-first-depends-on-past is deprecated as the value is always set to True
[2021-02-10 00:48:57,661] {dagbag.py:448} INFO - Filling up the DagBag from /opt/airflow/dags
[2021-02-10 00:48:57,972] {base_executor.py:82} INFO - Adding to queue: ['airflow', 'tasks', 'run', 'test_tutorial_taskflow_api_etl', 'extract', '2021-01-04T08:00:00+00:00', '--local', '--pool', 'default_pool', '--subdir', 'DAGS_FOLDER/etl1.py']
[2021-02-10 00:48:57,984] {base_executor.py:82} INFO - Adding to queue: ['airflow', 'tasks', 'run', 'test_tutorial_taskflow_api_etl', 'transform', '2021-01-04T08:00:00+00:00', '--local', '--pool', 'default_pool', '--subdir', 'DAGS_FOLDER/etl1.py']
[2021-02-10 00:48:57,996] {base_executor.py:82} INFO - Adding to queue: ['airflow', 'tasks', 'run', 'test_tutorial_taskflow_api_etl', 'load', '2021-01-04T08:00:00+00:00', '--local', '--pool', 'default_pool', '--subdir', 'DAGS_FOLDER/etl1.py']
Traceback (most recent call last):
File "/home/airflow/.local/bin/airflow", line 8, in <module>
sys.exit(main())
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/__main__.py", line 40, in main
args.func(args)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/cli/cli_parser.py", line 48, in command
return func(*args, **kwargs)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/cli.py", line 92, in wrapper
return f(*args, **kwargs)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/cli/commands/dag_command.py", line 103, in dag_backfill
dag.run(
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/models/dag.py", line 1706, in run
job.run()
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/base_job.py", line 237, in run
self._execute()
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/session.py", line 65, in wrapper
return func(*args, session=session, **kwargs)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/backfill_job.py", line 799, in _execute
self._execute_for_run_dates(
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/session.py", line 62, in wrapper
return func(*args, **kwargs)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/backfill_job.py", line 722, in _execute_for_run_dates
processed_dag_run_dates = self._process_backfill_task_instances(
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/session.py", line 62, in wrapper
return func(*args, **kwargs)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/jobs/backfill_job.py", line 602, in _process_backfill_task_instances
executor.heartbeat()
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/executors/base_executor.py", line 158, in heartbeat
self.trigger_tasks(open_slots)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/executors/celery_executor.py", line 263, in trigger_tasks
self._process_tasks(task_tuples_to_send)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/executors/celery_executor.py", line 272, in _process_tasks
key_and_async_results = self._send_tasks_to_celery(task_tuples_to_send)
File "/home/airflow/.local/lib/python3.8/site-packages/airflow/executors/celery_executor.py", line 331, in _send_tasks_to_celery
key_and_async_results = send_pool.map(
File "/usr/local/lib/python3.8/multiprocessing/pool.py", line 364, in map
return self._map_async(func, iterable, mapstar, chunksize).get()
File "/usr/local/lib/python3.8/multiprocessing/pool.py", line 771, in get
raise self._value
File "/usr/local/lib/python3.8/multiprocessing/pool.py", line 537, in _handle_tasks
put(task)
File "/usr/local/lib/python3.8/multiprocessing/connection.py", line 206, in send
self._send_bytes(_ForkingPickler.dumps(obj))
File "/usr/local/lib/python3.8/multiprocessing/reduction.py", line 51, in dumps
cls(buf, protocol).dump(obj)
AttributeError: Can't pickle local object 'test_tutorial_taskflow_api_etl.<locals>.transform'
</details>
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[GitHub] [airflow] Dr-Denzy commented on issue #14162: Example tutorial_taskflow_api_etl crashes w/ AttributeError: Can't pickle local object
Posted by GitBox <gi...@apache.org>.
Dr-Denzy commented on issue #14162:
URL: https://github.com/apache/airflow/issues/14162#issuecomment-776680175
I am already on it.
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[GitHub] [airflow] kaxil commented on issue #14162: Example tutorial_taskflow_api_etl crashes w/ AttributeError: Can't pickle local object
Posted by GitBox <gi...@apache.org>.
kaxil commented on issue #14162:
URL: https://github.com/apache/airflow/issues/14162#issuecomment-776679570
Can you take a look at this please @Dr-Denzy
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[GitHub] [airflow] kaxil commented on issue #14162: Example tutorial_taskflow_api_etl crashes w/ AttributeError: Can't pickle local object
Posted by GitBox <gi...@apache.org>.
kaxil commented on issue #14162:
URL: https://github.com/apache/airflow/issues/14162#issuecomment-782126602
Where are you running the backfill commands, try running it on Scheduler container instead of the webserver
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[GitHub] [airflow] boring-cyborg[bot] commented on issue #14162: Example tutorial_taskflow_api_etl crashes w/ AttributeError: Can't pickle local object
Posted by GitBox <gi...@apache.org>.
boring-cyborg[bot] commented on issue #14162:
URL: https://github.com/apache/airflow/issues/14162#issuecomment-776358083
Thanks for opening your first issue here! Be sure to follow the issue template!
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[GitHub] [airflow] Dr-Denzy commented on issue #14162: Example tutorial_taskflow_api_etl crashes w/ AttributeError: Can't pickle local object
Posted by GitBox <gi...@apache.org>.
Dr-Denzy commented on issue #14162:
URL: https://github.com/apache/airflow/issues/14162#issuecomment-779925340
@gschwim I have been able to reproduce the issue. Classically implemented dags backfill work as expected. @kaxil and I are further investigating why the Taskflow API dags backfill are failing.
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