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We have a python script that called servers.list() on an instance of
novaclient.v2.client.Client . Sometimes that raises a "BadRequest marker
not found" exception:

Our call:

  client = nova_client.Client("2", session=some_session)
  client.servers.list()

Observed Stacktrace:

  File "/usr/lib/python2.7/site-packages/XXXX/XXXX.py", line 630, in XXXX:
    all_servers = self.nova.servers.list()
  File "/usr/lib/python2.7/site-packages/novaclient/v2/servers.py", line 854, in list
    "servers")
  File "/usr/lib/python2.7/site-packages/novaclient/base.py", line 257, in _list
    resp, body = self.api.client.get(url)
  File "/usr/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 304, in get
    return self.request(url, 'GET', **kwargs)
  File "/usr/lib/python2.7/site-packages/novaclient/client.py", line 83, in request
    raise exceptions.from_response(resp, body, url, method)
BadRequest: marker [6a91d602-ab6e-42e0-929e-5ec33df2ddef] not found (HTTP 400) (Request-ID: req-78827725-801d-4514-8cc8-e4b94f15c191)

Discussion:

We have a lot of stacks and we sometimes create multiple stacks at the same time. We've noticed that that the stacks with the mentioned UUIDs were created just before these errors occur. It seems that when a newly-created stack appears at a certain location in the server list, its UUID is used as a marker, but the code that validates the marker does
not recognize such stacks.

Relevant versions:

- python-novaclient (9.1.0)
- nova (16.0.0)

** Affects: nova
     Importance: Undecided
     Assignee: Surya Seetharaman (tssurya)
         Status: New


** Tags: cells
-- 
nova client servers.list crashes with bad marker
https://bugs.launchpad.net/bugs/1773945
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