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[Sean Dague <sean@xxxxxxxxx>]

*** This bug is a duplicate of bug 1451860 ***
    https://bugs.launchpad.net/bugs/1451860

** This bug has been marked a duplicate of bug 1451860
   Attached volume migration failed, due to incorrect arguments  order passed to swap_volume

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https://bugs.launchpad.net/bugs/1536442

Title:
  swap volume is not available because the parameters are opposite

Status in OpenStack Compute (nova):
  New

Bug description:
  version: kilo

  description:

  in the file：/nova/compute/manager.py   . the functions like this:

  class _ComputeV4Proxy(object):
      
      def swap_volume(self, ctxt, instance, old_volume_id, new_volume_id):
          return self.manager.swap_volume(ctxt, instance, old_volume_id,
                                          new_volume_id)

  
  class ComputeManager(manager.Manager):
      
     @wrap_exception()
      @reverts_task_state
      @wrap_instance_fault
      def swap_volume(self, context, old_volume_id, new_volume_id, instance):

  
  you see ,the parameters of instance should be in the right place .

  
  product steps:

  1 create a volume
  2 create a vm
  3 attach the volume to the vm
  4 migrate the volume to another backend.

  
  error logs:

  2016-01-21 10:57:24.916 24271 ERROR root [req-15d4d656-06ee-4c02-8da0-af77aaaa9944 9134a1a11e5441c29e37757231f36450 32bfe3124bb2478aad3e6aa1cee09f14 - - -] Original exception being dropped: ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 392, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 5628, in swap_volume\n    instance.uuid)\n', "AttributeError: 'unicode' object has no attribute 'uuid'\n"]
  2016-01-21 10:57:24.916 24271 ERROR root [req-15d4d656-06ee-4c02-8da0-af77aaaa9944 9134a1a11e5441c29e37757231f36450 32bfe3124bb2478aad3e6aa1cee09f14 - - -] Original exception being dropped: ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 347, in decorated_function\n    return function(self, context, *args, **kwargs)\n', '  File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 404, in decorated_function\n    kwargs[\'instance\'], e, sys.exc_info())\n', '  File "/usr/lib/python2.7/site-packages/nova/compute/utils.py", line 89, in add_instance_fault_from_exc\n    fault_obj.instance_uuid = instance.uuid\n', "AttributeError: 'unicode' object has no attribute 'uuid'\n"]
  2016-01-21 10:57:24.917 24271 ERROR oslo_messaging.rpc.dispatcher [req-15d4d656-06ee-4c02-8da0-af77aaaa9944 9134a1a11e5441c29e37757231f36450 32bfe3124bb2478aad3e6aa1cee09f14 - - -] Exception during message handling: string indices must be integers
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 8262, in swap_volume
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     new_volume_id)
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/exception.py", line 88, in wrapped
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     payload)
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/exception.py", line 71, in wrapped
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 363, in decorated_function
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher     instance_uuid = keyed_args['instance']['uuid']
  2016-01-21 10:57:24.917 24271 TRACE oslo_messaging.rpc.dispatcher TypeError: string indices must be integers


  please check this bug, tks.

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