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[Bug 1456871] Re: objects.InstanceList.get_all(context, ['metadata', 'system_metadata']) return error can't locate strategy for %s %s" % (cls, key)

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: zhaoyim <yyyiming@xxxxxxx>
Date: Wed, 20 May 2015 05:13:04 -0000
Reply-to: Bug 1456871 <1456871@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Project changed: nova-solver-scheduler => nova

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https://bugs.launchpad.net/bugs/1456871

Title:
  objects.InstanceList.get_all(context, ['metadata','system_metadata'])
  return error can't locate strategy for %s %s" % (cls, key)

Status in OpenStack Compute (Nova):
  New

Bug description:
  In our code we invoke the code as following:

  objects.InstanceList.get_all(context, ['metadata','system_metadata'])

  It throw the error said:
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager     strat = self._get_strategy(loader.strategy)
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/interfaces.py", line 452, in _get_strategy
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager     cls = self._strategy_lookup(*key)
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager   File "/usr/lib64/python2.7/site-packages/sqlalchemy/orm/interfaces.py", line 507, in _strategy_lookup
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager     raise Exception("can't locate strategy for %s %s" % (cls, key))
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager Exception: can't locate strategy for <class 'sqlalchemy.orm.properties.ColumnProperty'> (('lazy', 'joined'),)
  2015-05-19 21:52:31.222 22676 TRACE nova.scheduler.ibm.ego.ego_manager

  The original used: db.instance_get_all(context,
  ['metadata','system_metadata'])  can worked well.

  Did some investigation and found the nova/objects/instance.py
  function  _expected_cols(expected_attrs):

  will return list ['metadata','system_metadata', 'extra',
  'extra.flavor'], then in the db query it throw the error: can't locate
  strategy for <class 'sqlalchemy.orm.properties.ColumnProperty'>
  (('lazy', 'joined'),)

  Could anyone can help have a look? Thanks!

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