GitHub user bangbangDong edited a comment on the discussion: The scheduler
stopped running due to a deadlock problem
Add the related error content: This shows that the main cause of the error was
caused when the dagrun was created.
```sh
**[2025-01-03T14:51:00.704+0800] {scheduler_job_runner.py:1387} ERROR - Failed
creating DagRun for OpsRo_data
Traceback (most recent call last):
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/base.py",
line 1910, in _execute_context
self.dialect.do_execute(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/default.py",
line 736, in do_execute
cursor.execute(statement, parameters)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/cursors.py",
line 153, in execute
result = self._query(query)
^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/cursors.py",
line 322, in _query
conn.query(q)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 563, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 825, in _read_query_result
result.read()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 1199, in read
first_packet = self.connection._read_packet()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 775, in _read_packet
packet.raise_for_error()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/protocol.py",
line 219, in raise_for_error
err.raise_mysql_exception(self._data)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/err.py",
line 150, in raise_mysql_exception
raise errorclass(errno, errval)**
**pymysql.err.OperationalError: (1213, 'Deadlock found when trying to get lock;
try restarting transaction')**
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/jobs/scheduler_job_runner.py",
line 1371, in _create_dag_runs
dag.create_dagrun(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/utils/session.py",
line 94, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/models/dag.py",
line 3188, in create_dagrun
run = _create_orm_dagrun(
^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/utils/session.py",
line 94, in wrapper
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/models/dag.py",
line 348, in _create_orm_dagrun
session.flush()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/session.py",
line 3449, in flush
self._flush(objects)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/session.py",
line 3588, in _flush
with util.safe_reraise():
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/util/langhelpers.py",
line 70, in __exit__
compat.raise_(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/util/compat.py",
line 211, in raise_
raise exception
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/session.py",
line 3549, in _flush
flush_context.execute()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/unitofwork.py",
line 456, in execute
rec.execute(self)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/unitofwork.py",
line 630, in execute
util.preloaded.orm_persistence.save_obj(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/persistence.py",
line 237, in save_obj
_emit_update_statements(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/persistence.py",
line 1001, in _emit_update_statements
c = connection._execute_20(
^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/base.py",
line 1710, in _execute_20
return meth(self, args_10style, kwargs_10style, execution_options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/sql/elements.py",
line 334, in _execute_on_connection
return connection._execute_clauseelement(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/base.py",
line 1577, in _execute_clauseelement
ret = self._execute_context(
^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/base.py",
line 1953, in _execute_context
self._handle_dbapi_exception(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/base.py",
line 2134, in _handle_dbapi_exception
util.raise_(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/util/compat.py",
line 211, in raise_
raise exception
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/base.py",
line 1910, in _execute_context
self.dialect.do_execute(
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/engine/default.py",
line 736, in do_execute
cursor.execute(statement, parameters)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/cursors.py",
line 153, in execute
result = self._query(query)
^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/cursors.py",
line 322, in _query
conn.query(q)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 563, in query
self._affected_rows = self._read_query_result(unbuffered=unbuffered)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 825, in _read_query_result
result.read()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 1199, in read
first_packet = self.connection._read_packet()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/connections.py",
line 775, in _read_packet
packet.raise_for_error()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/protocol.py",
line 219, in raise_for_error
err.raise_mysql_exception(self._data)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/pymysql/err.py",
line 150, in raise_mysql_exception
raise errorclass(errno, errval)
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (1213,
'Deadlock found when trying to get lock; try restarting transaction')
[SQL: UPDATE dag SET next_dagrun_create_after=%(next_dagrun_create_after)s
WHERE dag.dag_id = %(dag_dag_id)s]
[parameters: {'next_dagrun_create_after': None, 'dag_dag_id': 'EVCal'}]
(Background on this error at: https://sqlalche.me/e/14/e3q8)
[2025-01-03T14:51:01.556+0800] {scheduler_job_runner.py:1016} ERROR - Exception
when executing SchedulerJob._run_scheduler_loop
Traceback (most recent call last):
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/jobs/scheduler_job_runner.py",
line 999, in _execute
self._run_scheduler_loop()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/jobs/scheduler_job_runner.py",
line 1138, in _run_scheduler_loop
num_queued_tis = self._do_scheduling(session)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/jobs/scheduler_job_runner.py",
line 1244, in _do_scheduling
self._create_dagruns_for_dags(guard, session)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/utils/retries.py",
line 93, in wrapped_function
for attempt in run_with_db_retries(max_retries=retries, logger=logger,
**retry_kwargs):
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/tenacity/__init__.py",
line 443, in __iter__
do = self.iter(retry_state=retry_state)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/tenacity/__init__.py",
line 376, in iter
result = action(retry_state)
^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/tenacity/__init__.py",
line 398, in <lambda>
self._add_action_func(lambda rs: rs.outcome.result())
^^^^^^^^^^^^^^^^^^^
File "/opt/tsysmart/local/python/lib/python3.11/concurrent/futures/_base.py",
line 449, in result
return self.__get_result()
^^^^^^^^^^^^^^^^^^^
File "/opt/tsysmart/local/python/lib/python3.11/concurrent/futures/_base.py",
line 401, in __get_result
raise self._exception
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/utils/retries.py",
line 102, in wrapped_function
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/jobs/scheduler_job_runner.py",
line 1325, in _create_dagruns_for_dags
guard.commit()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/airflow/utils/sqlalchemy.py",
line 440, in commit
self.session.commit()
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/session.py",
line 1454, in commit
self._transaction.commit(_to_root=self.future)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/session.py",
line 830, in commit
self._assert_active(prepared_ok=True)
File
"/home/ttrs/tsysmart/platform/python/airflow/venv/lib/python3.11/site-packages/sqlalchemy/orm/session.py",
line 604, in _assert_active
raise sa_exc.PendingRollbackError(
sqlalchemy.exc.PendingRollbackError: This Session's transaction has been rolled
back due to a previous exception during flush. To begin a new transaction with
this Session, first issue Session.rollback(). Original exception was:
(pymysql.err.OperationalError) (1213, 'Deadlock found when trying to get lock;
try restarting transaction')
[SQL: UPDATE dag SET next_dagrun_create_after=%(next_dagrun_create_after)s
WHERE dag.dag_id = %(dag_dag_id)s]
[parameters: {'next_dagrun_create_after': None, 'dag_dag_id': 'EVCal'}]
(Background on this error at: https://sqlalche.me/e/14/e3q8) (Background on
this error at: https://sqlalche.me/e/14/7s2a)
```
GitHub link:
https://github.com/apache/airflow/discussions/45275#discussioncomment-11723425
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