potiuk opened a new issue #11787:
URL: https://github.com/apache/airflow/issues/11787
**Environment**:
Breeze Sqlite version
**What happened**:
With the current master version of Airflow there is a problem with locking
the database when running default Airflow configuration in Sqlite in Breeze.
## How to reproduce
```./breeze start-airflow --load-example-dags```
Start running/clicking on DAGS, You will soon start getting errors:
```
he above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2447, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1952, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1821, in
handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39,
in reraise
raise value
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1950, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1936, in
dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/opt/airflow/airflow/www/decorators.py", line 117, in wrapper
return f(self, *args, **kwargs)
File
"/usr/local/lib/python3.6/site-packages/flask_appbuilder/security/decorators.py",
line 109, in wraps
return f(self, *args, **kwargs)
File "/opt/airflow/airflow/www/decorators.py", line 98, in view_func
return f(*args, **kwargs)
File "/opt/airflow/airflow/www/decorators.py", line 59, in wrapper
session.add(log)
File "/usr/local/lib/python3.6/contextlib.py", line 88, in __exit__
next(self.gen)
File "/opt/airflow/airflow/utils/session.py", line 31, in create_session
session.commit()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py",
line 1042, in commit
self.transaction.commit()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py",
line 504, in commit
self._prepare_impl()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py",
line 483, in _prepare_impl
self.session.flush()
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py",
line 2523, in flush
self._flush(objects)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py",
line 2664, in _flush
transaction.rollback(_capture_exception=True)
File
"/usr/local/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line
69, in __exit__
exc_value, with_traceback=exc_tb,
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py",
line 182, in raise_
raise exception
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/session.py",
line 2624, in _flush
flush_context.execute()
File
"/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line
422, in execute
rec.execute(self)
File
"/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line
589, in execute
uow,
File
"/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line
245, in save_obj
insert,
File
"/usr/local/lib/python3.6/site-packages/sqlalchemy/orm/persistence.py", line
1136, in _emit_insert_statements
statement, params
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py",
line 1011, in execute
return meth(self, multiparams, params)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/elements.py",
line 298, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py",
line 1130, in _execute_clauseelement
distilled_params,
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py",
line 1317, in _execute_context
e, statement, parameters, cursor, context
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py",
line 1511, in _handle_dbapi_exception
sqlalchemy_exception, with_traceback=exc_info[2], from_=e
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py",
line 182, in raise_
raise exception
File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py",
line 1277, in _execute_context
cursor, statement, parameters, context
File
"/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line
593, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) database is
locked
[SQL: INSERT INTO log (dttm, dag_id, task_id, event, execution_date, owner,
extra) VALUES (?, ?, ?, ?, ?, ?, ?)]
[parameters: ('2020-10-23 16:35:08.015990', 'example_branch_operator', None,
'tree', None, 'admin', "[('dag_id', 'example_branch_operator')]")]
(Background on this error at: http://sqlalche.me/e/13/e3q8)
```
**Anything else we need to know**:
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