Open Stack

I configured Nova (both controller-nodes and compute-nodes) with
*ZooKeeper*(on Ubuntu 12.04).
I can create instance and other operations seem OK.
But when i delete instance:
# nova delete 92d154dd-6f4d-483c-84d4-ad1b8a691156
The server has either erred or is incapable of performing the requested
operation. (HTTP 500) (Request-ID: req-48afc072-1e7d-473a-b99f-53c22051f260)

And check nova-api.log and saw errors (quite long):

2013-09-17 17:39:19.617 ERROR nova.exception
[req-48afc072-1e7d-473a-b99f-53c22051f260 3f75c75d09ce4d01887c7415ef7c5ae9
55634eee777042
b69cdb478230e88d52] Exception in string format operation
2013-09-17 17:39:19.617 20071 TRACE nova.exception Traceback (most recent
call last):
2013-09-17 17:39:19.617 20071 TRACE nova.exception   File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 147, in __init__
2013-09-17 17:39:19.617 20071 TRACE nova.exception     message =
self.message % kwargs
2013-09-17 17:39:19.617 20071 TRACE nova.exception TypeError: %d format: a
number is required, not str
2013-09-17 17:39:19.617 20071 TRACE nova.exception
2013-09-17 17:39:19.618 ERROR nova.exception
[req-48afc072-1e7d-473a-b99f-53c22051f260 3f75c75d09ce4d01887c7415ef7c5ae9
55634eee777042
b69cdb478230e88d52] code: 500
2013-09-17 17:39:19.618 ERROR nova.exception
[req-48afc072-1e7d-473a-b99f-53c22051f260 3f75c75d09ce4d01887c7415ef7c5ae9
55634eee777042
b69cdb478230e88d52] driver: ZooKeeperDriver
2013-09-17 17:39:19.642 ERROR nova.api.openstack
[req-48afc072-1e7d-473a-b99f-53c22051f260 3f75c75d09ce4d01887c7415ef7c5ae9
55634eee77
7042b69cdb478230e88d52] Caught error: The service from servicegroup driver
%(driver) is temporarily unavailable.
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack Traceback (most
recent call last):
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/api/openstack/__init__.py", line
81, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
req.get_response(self.application)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/request.py", line 1296, in send
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     application,
catch_exc_info=False)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/request.py", line 1260, in call_
application
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     app_iter =
application(self.environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
resp(environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/keystoneclient/middleware/auth_token.p
y", line 450, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
self.app(env, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
resp(environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
resp(environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
resp(environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/routes/middleware.py", line 131, in __
call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     response =
self.app(environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 144, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
resp(environ, start_response)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 130, in __call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     resp =
self.call_func(req, *args, **self.kwargs)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/webob/dec.py", line 195, in call_func
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
self.func(req, *args, **kwargs)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 890, in
__call__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     content_type,
body, accept)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 942, in
_process_stack
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     action_result =
self.dispatch(meth, request, action_args)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/api/openstack/wsgi.py", line 1022,
in dispatch
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
method(req=request, **action_args)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/servers.py",
line 1117, in delete
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
self._delete(req.environ['nova.context'], req, id)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/api/openstack/compute/servers.py",
line 961, in _delete
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
self.compute_api.delete(context, instance)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 163, in wrapped
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
func(self, context, target, *args, **kwargs)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 153, in inner
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
function(self, context, instance, *args, **kwargs)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 134, in inner
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return f(self,
context, instance, *args, **kw)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 1233, in delete
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
self._delete_instance(context, instance)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 1225, in
_delete_instance
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
task_state=task_states.DELETING)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 1122, in
_delete
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
project_id=project_id)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     self.gen.next()
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/compute/api.py", line 1093, in
_delete
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     if
self.servicegroup_api.service_is_up(service):
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/servicegroup/api.py", line 93, in
service_is_up
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     return
self._driver.is_up(member)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/servicegroup/drivers/zk.py", line
115, in is_up
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     all_members =
self.get_all(group_id)
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack   File
"/usr/lib/python2.7/dist-packages/nova/servicegroup/drivers/zk.py", line
138, in get_all
*2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack     raise
exception.ServiceGroupUnavailable(driver="ZooKeeperDriver")
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
ServiceGroupUnavailable: The service from servicegroup driver %(driver) is
temporarily unavailable.*
2013-09-17 17:39:19.642 20071 TRACE nova.api.openstack
2013-09-17 17:39:19.646 INFO nova.api.openstack
[req-48afc072-1e7d-473a-b99f-53c22051f260 3f75c75d09ce4d01887c7415ef7c5ae9
55634eee777042b69cdb478230e88d52]
http://123.30.234.14:8774/v2/55634eee777042b69cdb478230e88d52/servers/92d154dd-6f4d-483c-84d4-ad1b8a691156returned
with HTTP 500


Do you have an idea why this bug happen?

Thank you very much!
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