gedOHub opened a new issue #13925:
URL: https://github.com/apache/airflow/issues/13925
**Apache Airflow version**: 2.0.0
**Kubernetes version**: -
**Environment**:
- Two servers running docker
- Docker image:` apache/airflow:2.0.0-python3.7`
- Each server contains:
- webserver
- scheduler
- celeny worker 1
- celeny worker 2
- celeny flower
- Broker- redis version `6.0.5`
- DB backend - MySQL version `8.0.20`
**What happened**:
Error message:
```bash
[...] {taskinstance.py:1038} INFO - Executing <Task(BashOperator): xxx.yyy>
on ...
[...] {standard_task_runner.py:51} INFO - Started process 4245 to run task
[...] {standard_task_runner.py:75} INFO - Running: ['airflow', 'tasks',
'run', 'zzz', 'xxx.yyy', '...', '--job-id', '8039', '--pool', 'default_pool',
'--raw', '--subdir', 'DAGS_FOLDER/ccc/ccc.zip', '--cfg-path',
'/tmp/tmpq2aaznri']
[...] {standard_task_runner.py:76} INFO - Job 8039: Subtask xxx.yyy
[...] {logging_mixin.py:103} INFO - Running <TaskInstance: zzz.xxx.yyy ...
[running]> on host HOST
[...] {taskinstance.py:1396} ERROR - (_mysql_exceptions.IntegrityError)
(1062, "Duplicate entry 'zzz-xxx.can_run_tasks_loca' for key
'rendered_task_instance_fields.PRIMARY'")
[SQL: INSERT INTO rendered_task_instance_fields (dag_id, task_id,
execution_date, rendered_fields, k8s_pod_yaml) VALUES (%s, %s, %s, %s, %s)]
[parameters: ('zzz', 'xxx.yyy', datetime.datetime(..., ..., ..., ..., ...),
'{"bash_command": "mkdir -p ~/eee && rm -rf ~/eee", "env": null}', 'null')]
(Background on this error at: http://sqlalche.me/e/13/gkpj)
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/base.py",
line 1277, in _execute_context
cursor, statement, parameters, context
File
"/home/airflow/.local/lib/python3.7/site-packages/sqlalchemy/engine/default.py",
line 593, in do_execute
cursor.execute(statement, parameters)
File
"/home/airflow/.local/lib/python3.7/site-packages/MySQLdb/cursors.py", line
255, in execute
self.errorhandler(self, exc, value)
File
"/home/airflow/.local/lib/python3.7/site-packages/MySQLdb/connections.py", line
50, in defaulterrorhandler
raise errorvalue
File
"/home/airflow/.local/lib/python3.7/site-packages/MySQLdb/cursors.py", line
252, in execute
res = self._query(query)
File
"/home/airflow/.local/lib/python3.7/site-packages/MySQLdb/cursors.py", line
378, in _query
db.query(q)
File
"/home/airflow/.local/lib/python3.7/site-packages/MySQLdb/connections.py", line
280, in query
_mysql.connection.query(self, query)
_mysql_exceptions.IntegrityError: (1062, "Duplicate entry 'zzz-xxx.yyy' for
key 'rendered_task_instance_fields.PRIMARY'")
```
**What you expected to happen**:
Run DAG without failing
**How to reproduce it**:
Use MySQL backend?
**Anything else we need to know**:
This problem occurs once in a while. I haven't found any pattern.
Maybe this related to https://github.com/apache/airflow/issues/9148 issue
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