This issue was fixed in the openstack/nova 27.2.0 release.
** Changed in: nova/antelope
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2027755
Title:
"sqlalchemy.exc.TimeoutError: QueuePool limit of size 5 overflow 50
reached, connection timed out, timeout 30.00" error raised after
repeated calls of Flavor.get_* methods
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) antelope series:
Fix Released
Status in OpenStack Compute (nova) wallaby series:
In Progress
Status in OpenStack Compute (nova) xena series:
In Progress
Status in OpenStack Compute (nova) yoga series:
In Progress
Status in OpenStack Compute (nova) zed series:
Fix Committed
Bug description:
This bug was reported downstream by a user who is using some
automation to query nova API for periodically for flavor information
and occasionally they receive a HTTP 500 error from nova API with a
message related to database connection pools.
The error:
sqlalchemy.exc.TimeoutError: QueuePool limit of size 5 overflow 50
reached, connection timed out, timeout 30.00 (Background on this error
at: https://sqlalche.me/e/14/3o7r)
is being raised in nova-api, causing a 500 error to be returned.
I think this is happening because of the placement of the
@api_db_api.context_manager.reader decorator (which manages the
database session) on a helper method instead of on the methods that
actually execute the database queries. I think it's resulting in
connections not being closed and eventually reaching the database
connection pool size limits.
The database context manager decorator needs to be on the methods that
execute the queries because part of what it does is close connections
after the method is run.
Full traceback:
Jul 13 22:06:48 ubuntu-jammy [email protected][270259]: DEBUG
nova.api.openstack.wsgi [None req-b47b7ad6-eecd-44a9-8264-706742dd8539 demo
demo] Calling method '<bound method FlavorExtraSpecsController.index of
<nova.api.openstack.compute.flavors_extraspecs.FlavorExtraSpecsController
object at 0x7ff2813d6ce0>>' {{(pid=270259) _process_stack
/opt/stack/nova/nova/api/openstack/wsgi.py:513}}
Jul 13 22:06:58 ubuntu-jammy [email protected][270259]: DEBUG dbcounter
[-] [270259] Writing DB stats nova_api:SELECT=2 {{(pid=270259) stat_writer
/usr/local/lib/python3.10/dist-packages/dbcounter.py:117}}
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi [None req-b47b7ad6-eecd-44a9-8264-706742dd8539 demo
demo] Unexpected exception in API method: sqlalchemy.exc.TimeoutError:
QueuePool limit of size 5 overflow 50 reached, connection timed out, timeout
30.00 (Background on this error at: https://sqlalche.me/e/14/3o7r)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi Traceback (most recent call last):
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File "/opt/stack/nova/nova/api/openstack/wsgi.py",
line 658, in wrapped
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return f(*args, **kwargs)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/opt/stack/nova/nova/api/openstack/compute/flavors_extraspecs.py", line 64, in
index
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return self._get_extra_specs(context, flavor_id)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/opt/stack/nova/nova/api/openstack/compute/flavors_extraspecs.py", line 34, in
_get_extra_specs
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi flavor = common.get_flavor(context, flavor_id)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File "/opt/stack/nova/nova/api/openstack/common.py",
line 494, in get_flavor
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return objects.Flavor.get_by_flavor_id(context,
flavor_id)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/oslo_versionedobjects/base.py", line
184, in wrapper
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi result = fn(cls, context, *args, **kwargs)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File "/opt/stack/nova/nova/objects/flavor.py", line
395, in get_by_flavor_id
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi db_flavor =
cls._flavor_get_by_flavor_id_from_db(context,
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File "/opt/stack/nova/nova/db/utils.py", line 35, in
wrapper
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return f(*args, **kwargs)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File "/opt/stack/nova/nova/objects/flavor.py", line
320, in _flavor_get_by_flavor_id_from_db
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi first()
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/orm/query.py", line 2823,
in first
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return self.limit(1)._iter().first()
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/orm/query.py", line 2907,
in _iter
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi result = self.session.execute(
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/orm/session.py", line 1711,
in execute
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi conn = self._connection_for_bind(bind)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/orm/session.py", line 1552,
in _connection_for_bind
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return self._transaction._connection_for_bind(
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/orm/session.py", line 747,
in _connection_for_bind
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi conn = bind.connect()
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/engine/base.py", line 3315,
in connect
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return self._connection_cls(self,
close_with_result=close_with_result)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/engine/base.py", line 96,
in __init__
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi else engine.raw_connection()
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/engine/base.py", line 3394,
in raw_connection
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return self._wrap_pool_connect(self.pool.connect,
_connection)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/engine/base.py", line 3361,
in _wrap_pool_connect
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return fn()
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/pool/base.py", line 320, in
connect
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi return _ConnectionFairy._checkout(self)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/pool/base.py", line 884, in
_checkout
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi fairy = _ConnectionRecord.checkout(pool)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/pool/base.py", line 486, in
checkout
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi rec = pool._do_get()
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi File
"/usr/local/lib/python3.10/dist-packages/sqlalchemy/pool/impl.py", line 134, in
_do_get
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi raise exc.TimeoutError(
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi sqlalchemy.exc.TimeoutError: QueuePool limit of size 5
overflow 50 reached, connection timed out, timeout 30.00 (Background on this
error at: https://sqlalche.me/e/14/3o7r)
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: ERROR
nova.api.openstack.wsgi
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: INFO
nova.api.openstack.wsgi [None req-b47b7ad6-eecd-44a9-8264-706742dd8539 demo
demo] HTTP exception thrown: Unexpected API Error. Please report this at
http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: <class
'sqlalchemy.exc.TimeoutError'>
Jul 13 22:07:18 ubuntu-jammy [email protected][270259]: DEBUG
nova.api.openstack.wsgi [None req-b47b7ad6-eecd-44a9-8264-706742dd8539 demo
demo] Returning 500 to user: Unexpected API Error. Please report this at
http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
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