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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from unittest import mock
import nova.compute
from nova import exception
from nova.tests import fixtures as nova_fixtures
from nova.tests.functional import integrated_helpers
class PinnedComputeRpcTests(integrated_helpers.ProviderUsageBaseTestCase):
compute_driver = 'fake.MediumFakeDriver'
def setUp(self):
# Use a custom weigher to make sure that we have a predictable host
# selection order during scheduling
self.useFixture(nova_fixtures.HostNameWeigherFixture())
super(PinnedComputeRpcTests, self).setUp()
self.compute1 = self._start_compute(host='host1')
self.compute2 = self._start_compute(host='host2')
self.compute3 = self._start_compute(host='host3')
def _test_reschedule_migration_with_compute_rpc_pin(self, version_cap):
self.flags(compute=version_cap, group='upgrade_levels')
server_req = self._build_server(networks='none')
server = self.api.post_server({'server': server_req})
server = self._wait_for_state_change(server, 'ACTIVE')
orig_claim = nova.compute.resource_tracker.ResourceTracker.resize_claim
claim_calls = []
def fake_orig_claim(
_self, context, instance, flavor, nodename,
*args, **kwargs,
):
if not claim_calls:
claim_calls.append(nodename)
raise exception.ComputeResourcesUnavailable(
reason='Simulated claim failure')
else:
claim_calls.append(nodename)
return orig_claim(
_self, context, instance, flavor, nodename, *args,
**kwargs)
with mock.patch(
'nova.compute.resource_tracker.ResourceTracker.resize_claim',
new=fake_orig_claim):
# Now migrate the server which is going to fail on the first
# destination but then will be rescheduled.
self.api.post_server_action(server['id'], {'migrate': None})
# We expect that the instance is on host3 as the scheduler
# selected host2 due to our weigher and the cold migrate failed
# there and re-scheduled to host3 were it succeeded.
self._wait_for_server_parameter(server, {
'OS-EXT-SRV-ATTR:host': 'host3',
'OS-EXT-STS:task_state': None,
'status': 'VERIFY_RESIZE'})
# we ensure that there was a failed and then a successful claim call
self.assertEqual(['host2', 'host3'], claim_calls)
def test_reschedule_migration_5_1(self):
self._test_reschedule_migration_with_compute_rpc_pin('5.1')
def test_reschedule_migration_5_0(self):
self._test_reschedule_migration_with_compute_rpc_pin('5.0')
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