original errors are swallowed by non-retriable error during savepoint release
See original GitHub issueUPDATE: simplified the gist to only use sanctioned cockroachdb-python code in the simplest ‘create duplicate’ scenario.
The following code returns sqlalchemy.exc.InternalError
because a nested transaction was rolled back. In such a case, I’d like to handle the actual error (eg., a sqlalchemy.IntegrityError
due to duplicate insertion) instead.
You can reproduce this with the following code: https://gist.github.com/gpaul/ead175558dddad2b0ea6479f2405bc8c
That yields the following stacktrace showing the actual reason for the failure: sqlalchemy.IntegrityError
raised the original exception:
Traceback (most recent call last):
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
psycopg2.IntegrityError: duplicate key value (key)=('some-key') violates unique constraint "configs_key_key"
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 2223, in _flush
flush_context.execute()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/unitofwork.py", line 389, in execute
rec.execute(self)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/unitofwork.py", line 548, in execute
uow
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/persistence.py", line 181, in save_obj
mapper, table, insert)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/persistence.py", line 835, in _emit_insert_statements
execute(statement, params)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 945, in execute
return meth(self, multiparams, params)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/sql/elements.py", line 263, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1053, in _execute_clauseelement
compiled_sql, distilled_params
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
context)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1402, in _handle_dbapi_exception
exc_info
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
raise value.with_traceback(tb)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.IntegrityError: (psycopg2.IntegrityError) duplicate key value (key)=('some-key') violates unique constraint "configs_key_key"
[SQL: 'INSERT INTO configs (key, value) VALUES (%(key)s, %(value)s) RETURNING configs.id'] [parameters: {'key': 'some-key', 'value': 'some-value'}]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
psycopg2.InternalError: SAVEPOINT COCKROACH_RESTART has not been used or a non-retriable error was encountered: current transaction is aborted, commands ignored until end of transaction block
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "repro4.py", line 66, in <module>
run_transaction(_session_factory, callback)
File "repro4.py", line 30, in run_transaction
return ret
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 567, in __exit__
self.rollback()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
raise value
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 564, in __exit__
self.commit()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 461, in commit
self._prepare_impl()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 441, in _prepare_impl
self.session.flush()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 2139, in flush
self._flush(objects)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 2259, in _flush
transaction.rollback(_capture_exception=True)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/langhelpers.py", line 76, in __exit__
compat.reraise(type_, value, traceback)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
raise value
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 2259, in _flush
transaction.rollback(_capture_exception=True)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 518, in rollback
util.reraise(*rollback_err)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
raise value
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 490, in rollback
transaction._rollback_impl()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 527, in _rollback_impl
t[1].rollback()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1621, in rollback
self._do_rollback()
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1683, in _do_rollback
self._savepoint, self._parent)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 750, in _rollback_to_savepoint_impl
self.engine.dialect.do_rollback_to_savepoint(self, name)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/cockroachdb/sqlalchemy/dialect.py", line 156, in do_rollback_to_savepoint
connection.execute('ROLLBACK TO SAVEPOINT cockroach_restart')
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 939, in execute
return self._execute_text(object, multiparams, params)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1097, in _execute_text
statement, parameters
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1189, in _execute_context
context)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1402, in _handle_dbapi_exception
exc_info
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
raise value.with_traceback(tb)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
context)
File "/home/gustav/.pyenv/versions/bouncer/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.InternalError: (psycopg2.InternalError) SAVEPOINT COCKROACH_RESTART has not been used or a non-retriable error was encountered: current transaction is aborted, commands ignored until end of transaction block
[SQL: 'ROLLBACK TO SAVEPOINT cockroach_restart']
Issue Analytics
- State:
- Created 6 years ago
- Comments:13 (6 by maintainers)
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Top GitHub Comments
I think cockroachdb/cockroach#16846 solves the main problem here, which is that after certain errors the
ROLLBACK TO SAVEPOINT
would reliably fail.There’s a secondary issue that if
ROLLBACK TO SAVEPOINT
fails for other reasons (e.g. network failure), its error clobbers the underlying error that caused the rollback. I don’t think we need to do anything special here - Python 3’s exception chaining already provides all the errors, so nothing is completely hidden, and there’s no special handling that is necessary when these network errors occur (unlike with the original error here, in which the ConditionFailedError might be handled specially).Thank you, this was fixed in https://github.com/cockroachdb/cockroach/pull/16846