hey there -

never seen that before so it is very likely to be an issue specific to 
mariadbconnector, which is a much lesser-used driver.  suggestions are to seek 
help from mariadb connector devs directly, in the interim try mysqlclient or 
pymysql to see if the issue resolves, or shows a better error message.



On Mon, Mar 28, 2022, at 6:58 AM, jens.t...@gmail.com wrote:
> Hello,
> 
> I’m utterly stomped by this problem and I hope that the wisdom of the crowd 
> (and the much more experienced users here) can point me into the right 
> direction.
> 
> I’ve got a single MariaDB <https://mariadb.org/> (Ver 15.1 Distrib 
> 10.6.5-MariaDB, for Linux (x86_64)) running natively on a Linux host, and 
> multiple containerized web servers (Pyramid <https://trypyramid.com/>) access 
> that db through a mounted volume /var/run/mysqld/mysqld.sock. Pyramid uses 
> the pyramid_tm <https://github.com/Pylons/pyramid_tm> package to manage its 
> per-request transactions, and it uses SQLAlchemy v1.4.31 with the connect URL
> 
> sqlalchemy.url = 
> mariadb+mariadbconnector://user:pwd@localhost/db?charset=utf8&binary_prefix=true&unix_socket=/var/run/mysqld/mysqld.sock
> 
> For two days now I’ve seen repeatedly the following errors for only one of 
> the servers (oddly, one user of that server) while the other servers seem to 
> operate just fine and continue talking to the db without problems.
> 
> Traceback (most recent call last):
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1802, in _execute_context
>     self.dialect.do_execute(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/default.py", 
> line 732, in do_execute
>     cursor.execute(statement, parameters)
> mariadb.InterfaceError
> 
> The above exception was the direct cause of the following exception:
> 
> Traceback (most recent call last):
>   File "/.../venv/lib/python3.9/site-packages/waitress/channel.py", line 426, 
> in service
>     task.service()
>   File "/.../venv/lib/python3.9/site-packages/waitress/task.py", line 168, in 
> service
>     self.execute()
>   ...
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/attributes.py", 
> line 481, in __get__
>     return self.impl.get(state, dict_)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/attributes.py", 
> line 941, in get
>     value = self._fire_loader_callables(state, key, passive)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/attributes.py", 
> line 977, in _fire_loader_callables
>     return self.callable_(state, passive)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/strategies.py", 
> line 911, in _load_for_state
>     return self._emit_lazyload(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/strategies.py", 
> line 1047, in _emit_lazyload
>     result = session.execute(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", 
> line 1692, in execute
>     result = conn._execute_20(statement, params or {}, execution_options)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1614, in _execute_20
>     return meth(self, args_10style, kwargs_10style, execution_options)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/sql/elements.py", 
> line 325, in _execute_on_connection
>     return connection._execute_clauseelement(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1481, in _execute_clauseelement
>     ret = self._execute_context(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1845, in _execute_context
>     self._handle_dbapi_exception(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 2026, in _handle_dbapi_exception
>     util.raise_(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/util/compat.py", 
> line 207, in raise_
>     raise exception
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1802, in _execute_context
>     self.dialect.do_execute(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/default.py", 
> line 732, in do_execute
>     cursor.execute(statement, parameters)
> sqlalchemy.exc.InterfaceError: (mariadb.InterfaceError) 
> [SQL: SELECT credits.id AS credits_id, credits.created AS credits_created, 
> credits.expires AS credits_expires, credits.deleted AS credits_deleted, 
> credits.user_id AS credits_user_id, credits.type AS credits_type, 
> credits.unit_price AS credits_unit_price, credits.quantity AS 
> credits_quantity, credits.count AS credits_count, credits.max_count AS 
> credits_max_count, credits.stripe_invoice_id AS credits_stripe_invoice_id, 
> credits.stripe_charge_id AS credits_stripe_charge_id, 
> credits.stripe_refunded_charge_id AS credits_stripe_refunded_charge_id, 
> credits.import_formats AS credits_import_formats, credits.export_formats AS 
> credits_export_formats, credits.coupon_id AS credits_coupon_id 
> FROM credits 
> WHERE ? = credits.user_id ORDER BY -credits.created]
> [parameters: ('bd87a54b6ca8404baeca03fc216f5e4e',)]
> (Background on this error at: https://sqlalche.me/e/14/rvf5)
> 
> The other error I’m seeing scattered throughout is:
> 
> Traceback (most recent call last):
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1802, in _execute_context
>     self.dialect.do_execute(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/default.py", 
> line 732, in do_execute
>     cursor.execute(statement, parameters)
> mariadb.OperationalError: Unknown MySQL error
> 
> The above exception was the direct cause of the following exception:
> 
> Traceback (most recent call last):
>   File "/.../venv/lib/python3.9/site-packages/waitress/channel.py", line 426, 
> in service
>     task.service()
>   File "/.../venv/lib/python3.9/site-packages/waitress/task.py", line 168, in 
> service
>     self.execute()
>   ...
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 
> 2810, in first
>     return self.limit(1)._iter().first()
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/query.py", line 
> 2894, in _iter
>     result = self.session.execute(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/orm/session.py", 
> line 1692, in execute
>     result = conn._execute_20(statement, params or {}, execution_options)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1614, in _execute_20
>     return meth(self, args_10style, kwargs_10style, execution_options)
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/sql/elements.py", 
> line 325, in _execute_on_connection
>     return connection._execute_clauseelement(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1481, in _execute_clauseelement
>     ret = self._execute_context(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1845, in _execute_context
>     self._handle_dbapi_exception(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 2026, in _handle_dbapi_exception
>     util.raise_(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/util/compat.py", 
> line 207, in raise_
>     raise exception
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", 
> line 1802, in _execute_context
>     self.dialect.do_execute(
>   File "/.../venv/lib/python3.9/site-packages/sqlalchemy/engine/default.py", 
> line 732, in do_execute
>     cursor.execute(statement, parameters)
> sqlalchemy.exc.OperationalError: (mariadb.OperationalError) Unknown MySQL 
> error
> [SQL: SELECT auth_tokens.id AS auth_tokens_id, auth_tokens.api_token_nonce AS 
> auth_tokens_api_token_nonce, auth_tokens.created AS auth_tokens_created, 
> auth_tokens.expires AS auth_tokens_expires, auth_tokens.deleted AS 
> auth_tokens_deleted, auth_tokens.user_id AS auth_tokens_user_id, 
> auth_tokens.auth_profile_id AS auth_tokens_auth_profile_id 
> FROM auth_tokens 
> WHERE auth_tokens.id = ? AND auth_tokens.expires > ? AND auth_tokens.deleted 
> IS NULL AND auth_tokens.api_token_nonce IS NULL 
>  LIMIT ?]
> [parameters: ('f9dfa20e141d41178c0d6c475ee21368', datetime.datetime(2022, 3, 
> 28, 9, 14, 22, 211131), 1)]
> (Background on this error at: https://sqlalche.me/e/14/e3q8)
> 
> Suffice to say (as it often is) I didn’t change anything and the containers 
> keep running and the host db hasn’t changed either. These errors started to 
> raise and weirdly for one single user only while others continue to work 
> without problems. Logging out/in and clearing auth tokens for that user 
> didn’t help.
> 
> Any suggestions or recommendations you might have are more than welcome! I’m 
> kind-of at my wits end right now… 🤔
> 
> Much thanks,
> Jens
> 
> 
> -- 
> SQLAlchemy - 
> The Python SQL Toolkit and Object Relational Mapper
>  
> http://www.sqlalchemy.org/
>  
> To post example code, please provide an MCVE: Minimal, Complete, and 
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full 
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To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
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