[2020-04-22 19:19:49,018] {taskinstance.py:1145} ERROR - (_mysql_exceptions.OperationalError) (1205, 'Lock wait timeout exceeded; try restarting transaction')
[SQL: INSERT INTO rendered_task_instance_fields (dag_id, task_id, execution_date, rendered_fields) VALUES (%s, %s, %s, %s)]
[parameters: ('some_dag_v.0.0.1', 'some_task_id', datetime.datetime(2019, 12, 2, 0, 0), 'Some rendered fields (837 characters truncated)')]

(Background on this error at: http://sqlalche.me/e/e3q8)
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1248, in _execute_context
cursor, statement, parameters, context
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 590, in do_execute
cursor.execute(statement, parameters)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line 255, in execute
self.errorhandler(self, exc, value)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line 252, in execute
res = self._query(query)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line 378, in _query
db.query(q)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/connections.py", line 280, in query
_mysql.connection.query(self, query)
_mysql_exceptions.OperationalError: (1205, 'Lock wait timeout exceeded; try restarting transaction')

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/airflow/models/taskinstance.py", line 1002, in _run_raw_task
self.refresh_from_db(lock_for_update=True)
File "/usr/local/lib/python3.7/site-packages/airflow/utils/db.py", line 74, in wrapper
return func(*args, **kwargs)
File "/usr/local/lib/python3.7/contextlib.py", line 119, in exit
next(self.gen)
File "/usr/local/lib/python3.7/site-packages/airflow/utils/db.py", line 45, in create_session
session.commit()
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 1036, in commit
self.transaction.commit()
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 503, in commit
self._prepare_impl()
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 482, in _prepare_impl
self.session.flush()
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 2496, in flush
self._flush(objects)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 2637, in _flush
transaction.rollback(capture_exception=True)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/langhelpers.py", line 69, in exit
exc_value, with_traceback=exc_tb,
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise
raise exception
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/session.py", line 2597, in _flush
flush_context.execute()
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/unitofwork.py", line 422, in execute
rec.execute(self)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/unitofwork.py", line 589, in execute
uow,
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/persistence.py", line 245, in save_obj
insert,
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/persistence.py", line 1083, in _emit_insert_statements
c = cached_connections[connection].execute(statement, multiparams)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 984, in execute
return meth(self, multiparams, params)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/sql/elements.py", line 293, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1103, in _execute_clauseelement
distilled_params,
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1288, in execute_context
e, statement, parameters, cursor, context
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1482, in handle_dbapi_exception
sqlalchemy_exception, with_traceback=exc_info[2], from=e
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 178, in raise
raise exception
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1248, in _execute_context
cursor, statement, parameters, context
File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 590, in do_execute
cursor.execute(statement, parameters)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line 255, in execute
self.errorhandler(self, exc, value)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line 252, in execute
res = self._query(query)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/cursors.py", line 378, in _query
db.query(q)
File "/usr/local/lib/python3.7/site-packages/MySQLdb/connections.py", line 280, in query
_mysql.connection.query(self, query)