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[Lance Bragstad <lbragstad@xxxxxxxxx>]

It sounds like the client is having a hard time dealing with that
specific data set. I'm not sure if the keystone service itself can do
anything about that.

Adding python-keystoneclient to this bug report until we figure out
exactly what's going on.

** Also affects: python-keystoneclient
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1724686

Title:
  authentication code hangs when there are three or more admin keystone
  endpoints

Status in OpenStack Identity (keystone):
  New
Status in python-keystoneclient:
  New

Bug description:
  I'm running stable/pike devstack, and I was playing around with what
  happens when there are many endpoints in multiple regions, and I
  stumbled over a scenario where the keystone authentication code hangs.

  My original endpoint list looked like this:

  ubuntu@devstack:/opt/stack/devstack$ openstack endpoint list
  +----------------------------------+-----------+--------------+-----------------+---------+-----------+--------------------------------------------------+
  | ID                               | Region    | Service Name | Service Type    | Enabled | Interface | URL                                              |
  +----------------------------------+-----------+--------------+-----------------+---------+-----------+--------------------------------------------------+
  | 0a9979ebfdbf48ce91ccf4e2dd952c1a | RegionOne | kingbird     | synchronization | True    | internal  | http://127.0.0.1:8118/v1.0                       |
  | 11d5507afe2a4eddb4f030695699114f | RegionOne | placement    | placement       | True    | public    | http://128.224.186.226/placement                 |
  | 1e42cf139398405188755b7e00aecb4d | RegionOne | keystone     | identity        | True    | admin     | http://128.224.186.226/identity                  |
  | 2daf99edecae4afba88bb58233595481 | RegionOne | glance       | image           | True    | public    | http://128.224.186.226/image                     |
  | 2ece52e8bbb34d47b9bd5611f5959385 | RegionOne | kingbird     | synchronization | True    | admin     | http://127.0.0.1:8118/v1.0                       |
  | 4835a089666a4b03bd2f499457ade6c2 | RegionOne | kingbird     | synchronization | True    | public    | http://127.0.0.1:8118/v1.0                       |
  | 78e9fbc0a47642268eda3e3576920f37 | RegionOne | nova         | compute         | True    | public    | http://128.224.186.226/compute/v2.1              |
  | 96a1e503dc0e4520a190b01f6a0cf79c | RegionOne | keystone     | identity        | True    | public    | http://128.224.186.226/identity                  |
  | a1887dbc8c5e4af5b4a6dc5ce224b8ff | RegionOne | cinderv2     | volumev2        | True    | public    | http://128.224.186.226/volume/v2/$(project_id)s  |
  | b7d5938141694a4c87adaed5105ea3ab | RegionOne | cinder       | volume          | True    | public    | http://128.224.186.226/volume/v1/$(project_id)s  |
  | bb169382cbea4715964e4652acd48070 | RegionOne | nova_legacy  | compute_legacy  | True    | public    | http://128.224.186.226/compute/v2/$(project_id)s |
  | e01c8d8e08874d61b9411045a99d4860 | RegionOne | neutron      | network         | True    | public    | http://128.224.186.226:9696/                     |
  | f94c96ed474249a29a6c0a1bb2b2e500 | RegionOne | cinderv3     | volumev3        | True    | public    | http://128.224.186.226/volume/v3/$(project_id)s  |
  +----------------------------------+-----------+--------------+-----------------+---------+-----------+--------------------------------------------------+

  I was able to successfully run the following python code:

  from keystoneauth1 import loading
  from keystoneauth1 import loading
  from keystoneauth1 import session
  from keystoneclient.v3 import client
  loader = loading.get_plugin_loader("password")
  auth = loader.load_from_options(username='admin',password='secret',project_name='admin',auth_url='http://128.224.186.226/identity')
  sess = session.Session(auth=auth)
  keystone = client.Client(session=sess)
  keystone.services.list()

  I then duplicated all of the endpoints in a new region "region2", and
  was able to run the python code.  When I duplicated all the endpoints
  again in a new region "region3" (for a total of 39 endpoints) the
  python code hung at the final line.

  Removing all the "region3" endpoints allowed the python code to work
  again.

  During all of this the command "openstack endpoint list" worked fine.

  Further testing seems to indicate that it is the third "admin"
  keystone endpoint that is causing the problem.  I can add multiple
  "public" keystone endpoints, but three or more "admin" keystone
  endpoints cause the python code to hang.

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