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[Adam Gandelman <1217479@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron/grizzly
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1217479

Title:
  make nvp plugin future version friendly

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron grizzly series:
  Fix Released

Bug description:
  If we run the NVP plugin with a shiny new version of NVP we might get
  stacktraces like the following:

  Traceback (most recent call last):
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 84, in resource
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 405, in create
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource     obj = obj_creator(request.context, **kwargs)
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/plugins/nicira/NeutronPlugin.py", line 1577, in create_router
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource     nexthop)
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/plugins/nicira/nvplib.py", line 90, in dispatch_version_dependent_function
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource     func = (NVPLIB_FUNC_DICT[func_name][v.major].get(v.minor) or
  2013-08-27 10:39:58.131 8604 TRACE neutron.api.v2.resource KeyError: NN

  Where NN is the version major that's missing from NVPLIB_FUNC_DICT.
  Currently we support 2.x and 3.x. But what happens when 4 or 5 come
  along? We can decide to assume the plugin is not supported on newer
  versions of the NVP platform, and fail gracefully, or we can fall back
  on a known version in the hope that backward compatibility is
  preserved. Either way, it'd be good not to leave this stacktrace as it
  is.

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