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[Bug 1117232] Re: lazy load operation of attribute 'system_metadata' cannot proceed

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Thu, 21 Feb 2013 08:54:56 -0000
Reply-to: Bug 1117232 <1117232@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => grizzly-3

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https://bugs.launchpad.net/bugs/1117232

Title:
  lazy load operation of attribute 'system_metadata' cannot proceed

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  branch: master
  commit: ee955d272ab4eef2e8371f2e460454058ce7e46c

  This happens sometimes when I restart nova-conductor and nova-compute services. The notification via rabbitmq is enabled in nova. 
  Is this the same cause of bug https://bugs.launchpad.net/nova/+bug/785816?

  
  nova-conductor trace is here:

  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp
  2013-02-06 19:21:20,250.250 ERROR nova.openstack.common.rpc.amqp [req-6c4474a3-ea95-4b40-9edb-a131c9a32aee None None] Exception during message handling
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp Traceback (most recent call last):
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/openstack/common/rpc/amqp.py", line 276, in _process_data
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     rval = self.proxy.dispatch(ctxt, version, method, **args)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/openstack/common/rpc/dispatcher.py", line 133, in dispatch
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     return getattr(proxyobj, method)(ctxt, **kwargs)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/conductor/manager.py", line 93, in instance_get_all_by_host
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     return jsonutils.to_primitive(result)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/openstack/common/jsonutils.py", line 97, in to_primitive
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     level=level))
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/openstack/common/jsonutils.py", line 108, in to_primitive
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     return to_primitive(dict(value.iteritems()),
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/db/sqlalchemy/models.py", line 102, in iteritems
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     local = dict(self)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/home/wenhao/workspace/openstack/nova/nova/db/sqlalchemy/models.py", line 91, in next
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     return n, getattr(self, n)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 168, in __get__
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     return self.impl.get(instance_state(instance),dict_)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 453, in get
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     value = self.callable_(state, passive)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/strategies.py", line 481, in _load_for_state
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp     (mapperutil.state_str(state), self.key)
  2013-02-06 19:21:20,250.250 31860 TRACE nova.openstack.common.rpc.amqp DetachedInstanceError: Parent instance <Instance at 0x443ba10> is not bound to a Session; lazy load operation of attribute 'system_metadata' cannot proceed

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