[Bug 1384108] Re: Exception during message handling: QueuePool limit of size 10 overflow 20 reached, connection timed out, timeout 10

Kyle Mestery 1384108 at bugs.launchpad.net
Mon Jul 20 19:42:18 UTC 2015 

** Changed in: neutron
   Importance: High => Medium

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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 neutron:
  Confirmed
Status in neutron package in Ubuntu:
  Confirmed

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.

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