[Bug 1384108] [NEW] Exception during message handling: QueuePool limit of size 10 overflow 20 reached, connection timed out, timeout 10
Kevin Benton
1384108 at bugs.launchpad.net
Wed Oct 22 08:51:32 UTC 2014
Can you try setting the max connections for SQL to the number of API
workers?
http://docs.openstack.org/trunk/config-reference/content/networking-options-db.html
On Oct 22, 2014 4:31 AM, "James Page" <james.page at ubuntu.com> wrote:
> Public bug reported:
>
> OpenStack Juno release, Ubuntu 14.04 using Cloud Archive; under
> relatively high instance creation concurrency (150), neutron starts to
> throw some errors:
>
> 2014-10-21 16:40:44.124 16312 ERROR oslo.messaging._drivers.common
> [req-8e3ebbdb-bc01-439d-af86-655176f206a6 ] ['Traceback (most recent call
> last):\n', ' File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 134, in _dispatch_and_reply\n incoming.message))\n', ' File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 177, in _dispatch\n return self._do_dispatch(endpoint, method, ctxt,
> args)\n', ' File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 123, in _do_dispatch\n result = getattr(endpoint, method)(ctxt,
> **new_args)\n', ' File
> "/usr/lib/python2.7/dist-packages/neutron/api/rpc/handlers/securitygroups_rpc.py",
> line 74, in security_group_info_for_devices\n ports =
> self._get_devices_info(devices_info)\n', ' File
> "/usr/lib/python2.7/dist-packages/neutron/api/rpc/handlers/securitygroups_rpc.py",
> line 41, in _get_devices_info\n port =
> self.plugin.get_port_from_device(device)\n', ' File
> "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/plugin.py", line
> 1161, in get_port_from_device\n port = db.get_port_and_sgs(port_id)\n',
> ' File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/db.py", line
> 222, in get_port_and_sgs\n port_and_sgs = query.all()\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2300, in
> all\n return list(self)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2412, in
> __iter__\n return self._execute_and_instances(context)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2425, in
> _execute_and_instances\n close_with_result=True)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2416, in
> _connection_from_session\n **kw)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 854, in
> connection\n close_with_result=close_with_result)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 858, in
> _connection_for_bind\n return
> self.transaction._connection_for_bind(engine)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 322, in
> _connection_for_bind\n conn = bind.contextual_connect()\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1799, in
> contextual_connect\n self.pool.connect(),\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 338, in
> connect\n return _ConnectionFairy._checkout(self)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 641, in
> _checkout\n fairy = _ConnectionRecord.checkout(pool)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 440, in
> checkout\n rec = pool._do_get()\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 957, in
> _do_get\n (self.size(), self.overflow(), self._timeout))\n',
> 'TimeoutError: QueuePool limit of size 10 overflow 20 reached, connection
> timed out, timeout 10\n']
> 2014-10-21 16:40:44.126 16312 ERROR oslo.messaging.rpc.dispatcher
> [req-ea96dc85-dc0f-4ddc-a827-dbc25ab32a03 ] Exception during message
> handling: QueuePool limit of size 10 overflow 20 reached, connection timed
> out, timeout 10
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> Traceback (most recent call last):
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 134, in _dispatch_and_reply
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> incoming.message))
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 177, in _dispatch
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self._do_dispatch(endpoint, method, ctxt, args)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 123, in _do_dispatch
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> result = getattr(endpoint, method)(ctxt, **new_args)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 237, in
> report_state
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> self.plugin.create_or_update_agent(context, agent_state)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 197, in
> create_or_update_agent
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self._create_or_update_agent(context, agent)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 176, in
> _create_or_update_agent
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> context, agent['agent_type'], agent['host'])
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 153, in
> _get_agent_by_type_and_host
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> Agent.host == host).one()
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2369, in
> one
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher ret
> = list(self)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2412, in
> __iter__
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self._execute_and_instances(context)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2425, in
> _execute_and_instances
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> close_with_result=True)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2416, in
> _connection_from_session
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher **kw)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 854, in
> connection
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> close_with_result=close_with_result)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 858, in
> _connection_for_bind
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self.transaction._connection_for_bind(engine)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 322, in
> _connection_for_bind
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher conn
> = bind.contextual_connect()
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1799, in
> contextual_connect
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> self.pool.connect(),
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 338, in connect
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return _ConnectionFairy._checkout(self)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 641, in
> _checkout
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> fairy = _ConnectionRecord.checkout(pool)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 440, in checkout
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher rec
> = pool._do_get()
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 957, in _do_get
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> (self.size(), self.overflow(), self._timeout))
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> TimeoutError: QueuePool limit of size 10 overflow 20 reached, connection
> timed out, timeout 10
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
>
> The cloud has three neutron-server instances, each configured with 32
> API workers.
>
> ** Affects: neutron
> Importance: Undecided
> Status: New
>
> ** Affects: neutron (Ubuntu)
> Importance: Undecided
> Status: New
>
>
> ** Tags: juno scale-testing
>
> ** Tags added: juno scale-testing
>
> ** Also affects: neutron
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are subscribed to
> neutron.
> Matching subscriptions: NeutronBugs
> https://bugs.launchpad.net/bugs/1384108
>
> Title:
> Exception during message handling: QueuePool limit of size 10 overflow
> 20 reached, connection timed out, timeout 10
>
> Status in OpenStack Neutron (virtual network service):
> New
> Status in “neutron” package in Ubuntu:
> New
>
> Bug description:
> OpenStack Juno release, Ubuntu 14.04 using Cloud Archive; under
> relatively high instance creation concurrency (150), neutron starts to
> throw some errors:
>
> 2014-10-21 16:40:44.124 16312 ERROR oslo.messaging._drivers.common
> [req-8e3ebbdb-bc01-439d-af86-655176f206a6 ] ['Traceback (most recent call
> last):\n', ' File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 134, in _dispatch_and_reply\n incoming.message))\n', ' File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 177, in _dispatch\n return self._do_dispatch(endpoint, method, ctxt,
> args)\n', ' File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 123, in _do_dispatch\n result = getattr(endpoint, method)(ctxt,
> **new_args)\n', ' File
> "/usr/lib/python2.7/dist-packages/neutron/api/rpc/handlers/securitygroups_rpc.py",
> line 74, in security_group_info_for_devices\n ports =
> self._get_devices_info(devices_info)\n', ' File
> "/usr/lib/python2.7/dist-packages/neutron/api/rpc/handlers/securitygroups_rpc.py",
> line 41, in _get_devices_info\n port =
> self.plugin.get_port_from_device(device)\n', ' File
> "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/plugin.py", line
> 1161, in get_port_from_device\n port = db.get_port_and_sgs(port_id)\n',
> ' File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/db.py", line
> 222, in get_port_and_sgs\n port_and_sgs = query.all()\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2300, in
> all\n return list(self)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2412, in
> __iter__\n return self._execute_and_instances(context)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2425, in
> _execute_and_instances\n close_with_result=True)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2416, in
> _connection_from_session\n **kw)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 854, in
> connection\n close_with_result=close_with_result)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 858, in
> _connection_for_bind\n return
> self.transaction._connection_for_bind(engine)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 322, in
> _connection_for_bind\n conn = bind.contextual_connect()\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1799, in
> contextual_connect\n self.pool.connect(),\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 338, in
> connect\n return _ConnectionFairy._checkout(self)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 641, in
> _checkout\n fairy = _ConnectionRecord.checkout(pool)\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 440, in
> checkout\n rec = pool._do_get()\n', ' File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 957, in
> _do_get\n (self.size(), self.overflow(), self._timeout))\n',
> 'TimeoutError: QueuePool limit of size 10 overflow 20 reached, connection
> timed out, timeout 10\n']
> 2014-10-21 16:40:44.126 16312 ERROR oslo.messaging.rpc.dispatcher
> [req-ea96dc85-dc0f-4ddc-a827-dbc25ab32a03 ] Exception during message
> handling: QueuePool limit of size 10 overflow 20 reached, connection timed
> out, timeout 10
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> Traceback (most recent call last):
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 134, in _dispatch_and_reply
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> incoming.message))
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 177, in _dispatch
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self._do_dispatch(endpoint, method, ctxt, args)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line
> 123, in _do_dispatch
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> result = getattr(endpoint, method)(ctxt, **new_args)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 237, in
> report_state
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> self.plugin.create_or_update_agent(context, agent_state)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 197, in
> create_or_update_agent
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self._create_or_update_agent(context, agent)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 176, in
> _create_or_update_agent
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> context, agent['agent_type'], agent['host'])
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/neutron/db/agents_db.py", line 153, in
> _get_agent_by_type_and_host
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> Agent.host == host).one()
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2369, in
> one
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> ret = list(self)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2412, in
> __iter__
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self._execute_and_instances(context)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2425, in
> _execute_and_instances
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> close_with_result=True)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2416, in
> _connection_from_session
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> **kw)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 854, in
> connection
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> close_with_result=close_with_result)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 858, in
> _connection_for_bind
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return self.transaction._connection_for_bind(engine)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 322, in
> _connection_for_bind
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> conn = bind.contextual_connect()
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line 1799, in
> contextual_connect
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> self.pool.connect(),
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 338, in connect
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> return _ConnectionFairy._checkout(self)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 641, in
> _checkout
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> fairy = _ConnectionRecord.checkout(pool)
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 440, in checkout
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> rec = pool._do_get()
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher File
> "/usr/lib/python2.7/dist-packages/sqlalchemy/pool.py", line 957, in _do_get
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> (self.size(), self.overflow(), self._timeout))
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
> TimeoutError: QueuePool limit of size 10 overflow 20 reached, connection
> timed out, timeout 10
> 2014-10-21 16:40:44.126 16312 TRACE oslo.messaging.rpc.dispatcher
>
> The cloud has three neutron-server instances, each configured with 32
> API workers.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/neutron/+bug/1384108/+subscriptions
>
--
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Server Team, which is subscribed to neutron in Ubuntu.
https://bugs.launchpad.net/bugs/1384108
Title:
Exception during message handling: QueuePool limit of size 10 overflow
20 reached, connection timed out, timeout 10
To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1384108/+subscriptions
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