In nova and cinder datasource driver, self.stat is set as {} at the begin of update_from_datasource(), then driver fetch data, translate it and update self.stat, but if the running thread switch before self.stat is updated completely, self.state is empty dict, datasource-row-list API will raise 400 exception because the table can't be found in self.state.
reproduce steps:
1. add pdb break point at the begin of 'get_items' funcation in row_model.py.
2. run command 'congress datasource row list cinder volumes'
3. debug the code step by step slowly, if the datasource polling occur before we execute the code line "if tablename not in service_obj.state:" , error is raised.
error output:
(openstack) congress datasource row list cinder volumes
...
DEBUG: keystoneclient.session REQ: curl -g -i -X GET http://10.250.10.29:1789/v1/data-sources/2e62a13d-ebcf-4362-b121-86c22543704d/tables/volumes/rows -H "User-Agent: python-congressclient" -H "Accept: application/json" -H "X-Auth-Token: {SHA1}fc31193cd2dc0518a01e8349c48a2424a0e2a36e"
DEBUG: requests.packages.urllib3.connectionpool "GET /v1/data-sources/2e62a13d-ebcf-4362-b121-86c22543704d/tables/volumes/rows HTTP/1.1" 400 116
DEBUG: keystoneclient.session RESP: [400] date: Mon, 13 Jul 2015 09:38:37 GMT connection: keep-alive content-type: application/json; charset=UTF-8 content-length: 116 x-openstack-request-id: req-02db330e-c79d-4d7f-8b3b-3df0d3d502b9
RESP BODY: {"error": {"message": "Unknown tablename 'volumes' for datasource 'cinder'", "error_data": 404, "error_code": 404}}
DEBUG: keystoneclient.session Request returned failure status: 400
ERROR: openstack Unknown tablename 'volumes' for datasource 'cinder' (HTTP 400) (Request-ID: req-02db330e-c79d-4d7f-8b3b-3df0d3d502b9)
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/cliff/app.py", line 314, in run_subcommand
result = cmd.run(parsed_args)
File "/usr/local/lib/python2.7/dist-packages/cliff/display.py", line 92, in run
column_names, data = self.take_action(parsed_args)
File "/opt/stack/python-congressclient/congressclient/osc/v1/datasource.py", line 189, in take_action
parsed_args.table)['results']
File "/opt/stack/python-congressclient/congressclient/v1/client.py", line 137, in list_datasource_rows
(datasource_name, table_name))
File "/usr/local/lib/python2.7/dist-packages/keystoneclient/adapter.py", line 170, in get
return self.request(url, 'GET', **kwargs)
File "/usr/local/lib/python2.7/dist-packages/keystoneclient/adapter.py", line 206, in request
resp = super(LegacyJsonAdapter, self).request(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/keystoneclient/adapter.py", line 95, in request
return self.session.request(url, method, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/openstackclient/common/session.py", line 40, in request
resp = super(TimingSession, self).request(url, method, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/keystoneclient/utils.py", line 336, in inner
return func(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/keystoneclient/session.py", line 397, in request
raise exceptions.from_response(resp, method, url)
BadRequest: Unknown tablename 'volumes' for datasource 'cinder' (HTTP 400) (Request-ID: req-02db330e-c79d-4d7f-8b3b-3df0d3d502b9)
DEBUG: openstackclient.shell clean_up ListDatasourceRows: Unknown tablename 'volumes' for datasource 'cinder' (HTTP 400) (Request-ID: req-02db330e-c79d-4d7f-8b3b-3df0d3d502b9)
Unknown tablename 'volumes' for datasource 'cinder' (HTTP 400) (Request-ID: req-02db330e-c79d-4d7f-8b3b-3df0d3d502b9)
Fix proposed to branch: master
Review: https:/