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[Bug 1545101] Re: "TypeError: __init__() takes exactly 3 arguments (2 given)" in n-api logs for nova metadata api request

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Results from run [1] still didn't yield any result. So that's my analysis: the api-paste file is not upgraded and that still contains an ec2 middleware (ec2faultwrap). This is the one that responds with 404, inline with what patch [3] does. That's the reason why we don't see the trace from Sean's patch [4]. I think the bug lies in grenade: if we get rid of ec2faultwrap we should get past the 404 error.
 
[1] http://logs.openstack.org/00/281600/4/experimental/gate-grenade-dsvm-neutron-multinode/28b0630//logs/new/
[2] http://logs.openstack.org/00/281600/4/experimental/gate-grenade-dsvm-neutron-multinode/28b0630//logs/etc/nova/api-paste.ini.txt.gz
[3] https://review.openstack.org/#/c/279721/3/nova/api/ec2/__init__.py
[4] https://review.openstack.org/#/c/282025/ 

** Also affects: grenade
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1545101

Title:
  "TypeError: __init__() takes exactly 3 arguments (2 given)" in n-api
  logs for nova metadata api request

Status in grenade:
  New
Status in neutron:
  In Progress
Status in OpenStack Compute (nova):
  In Progress

Bug description:
  http://logs.openstack.org/59/265759/24/experimental/gate-grenade-dsvm-
  neutron-
  multinode/8f1deec/logs/new/screen-n-api.txt.gz?level=INFO#_2016-02-12_16_28_16_860

  2016-02-12 16:28:16.860 20168 INFO nova.metadata.wsgi.server [-] Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/eventlet/wsgi.py", line 470, in handle_one_response
      result = self.application(self.environ, start_response)
    File "/usr/local/lib/python2.7/dist-packages/paste/urlmap.py", line 216, in __call__
      return app(environ, start_response)
    File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
      resp = self.call_func(req, *args, **self.kwargs)
    File "/usr/local/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
      return self.func(req, *args, **kwargs)
    File "/opt/stack/new/nova/nova/api/ec2/__init__.py", line 32, in __call__
      return webob.exc.HTTPException(message=_DEPRECATION_MESSAGE)
  TypeError: __init__() takes exactly 3 arguments (2 given)

  This only shows up in the gate-grenade-dsvm-neutron-multinode job
  which is not running the n-api-meta service but is running the neutron
  metadata service, which has a bunch of warnings because it's not
  getting valid responses back from the nova metadata API (b/c it's not
  running):

  http://logs.openstack.org/59/265759/24/experimental/gate-grenade-dsvm-
  neutron-multinode/8f1deec/logs/new/screen-q-meta.txt.gz?level=TRACE

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References

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