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[zhaoyim <yyyiming@xxxxxxx>]

@Sylvain Bauza Sorry! please ignore the trace. I updated the issue
description and the problem should belong to nova component. Please have
a look. Thanks a lot!

** Changed in: nova
       Status: Invalid => New

** Description changed:

- In our code we invoke the code as following:
+ When invoke
  
  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):
+ Then 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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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:
  When invoke

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

  
  Then 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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