DreamyWen opened a new issue #14063:
URL: https://github.com/apache/airflow/issues/14063
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**Apache Airflow version**:
1.10.14
**Kubernetes version (if you are using kubernetes)** (use `kubectl version`):
**Environment**:
System Version: macOS 11.1 (20C69)
Version: Darwin 20.2.0
Python 3.8.5
- **Cloud provider or hardware configuration**:
- **OS** (e.g. from /etc/os-release):
- **Kernel** (e.g. `uname -a`):
- **Install tools**:
- **Others**:
**What happened**:
[2021-02-04 13:55:00,605] {base_executor.py:58} INFO - Adding to queue:
['airflow', 'run', 'example_bash_operator', 'runme_2',
'2021-02-04T05:54:56.206452+00:00', '--local', '--pool', 'default_pool', '-sd',
'/Users/saith/anaconda3/envs/airflow/lib/python3.8/site-packages/airflow/example_dags/example_bash_operator.py']
[2021-02-04 13:55:00,636] {scheduler_job.py:1384} ERROR - Exception when
executing execute_helper
Traceback (most recent call last):
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 1382, in _execute
self._execute_helper()
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 1453, in _execute_helper
if not
self._validate_and_run_task_instances(simple_dag_bag=simple_dag_bag):
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/site-packages/airflow/jobs/scheduler_job.py",
line 1515, in _validate_and_run_task_instances
self.executor.heartbeat()
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/site-packages/airflow/executors/base_executor.py",
line 130, in heartbeat
self.trigger_tasks(open_slots)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/site-packages/airflow/executors/celery_executor.py",
line 229, in trigger_tasks
send_pool = Pool(processes=num_processes, initializer=reset_signals)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/context.py",
line 119, in Pool
return Pool(processes, initializer, initargs, maxtasksperchild,
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/pool.py",
line 212, in __init__
self._repopulate_pool()
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/pool.py",
line 303, in _repopulate_pool
return self._repopulate_pool_static(self._ctx, self.Process,
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/pool.py",
line 326, in _repopulate_pool_static
w.start()
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/process.py",
line 121, in start
self._popen = self._Popen(self)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/context.py",
line 284, in _Popen
return Popen(process_obj)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/popen_spawn_posix.py",
line 32, in __init__
super().__init__(process_obj)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/popen_fork.py",
line 19, in __init__
self._launch(process_obj)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/popen_spawn_posix.py",
line 47, in _launch
reduction.dump(process_obj, fp)
File
"/Users/saith/anaconda3/envs/airflow/lib/python3.8/multiprocessing/reduction.py",
line 60, in dump
ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object
'CeleryExecutor.trigger_tasks.<locals>.reset_signals'
<!-- (please include exact error messages if you can) -->
**What you expected to happen**:
the demo dag should be triggerd with no error
<!-- What do you think went wrong? -->
I think the error is similar to this issue
https://issues.apache.org/jira/browse/AIRFLOW-6529
**How to reproduce it**:
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--->
airflow install
===
```
conda create -n airflow python=3.8
pip install 'apache-airflow==1.10.14'
pip install 'apache-airflow[redis]==1.10.14'
pip install 'apache-airflow[celery]==1.10.14'
pip install 'apache-airflow[mysql]==1.10.14'
```
change the airflow.cfg
```
sql_alchemy_conn = mysql://airflow:airflow@localhost:3306/airflow
broker_url = redis://127.0.0.1:6379/0
result_backend = db+mysql://airflow:airflow@localhost:3306/airflow
executor = CeleryExecutor
```
====
boot mysql， redis
```
mysql.server start
redis-server
```
======
```
CREATE DATABASE airflow CHARACTER SET utf8 COLLATE utf8_unicode_ci;
```
airflow initdb
```
airflow webserver
airflow worker
airflow scheduler
```
when i trigger on demo dag , the error occurs
**Anything else we need to know**:
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