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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
from nova import exception
from nova.tests.functional import integrated_helpers
class ForcedHostMissingReScheduleTestCase(
integrated_helpers.ProviderUsageBaseTestCase):
compute_driver = 'fake.SmallFakeDriver'
def setUp(self):
super(ForcedHostMissingReScheduleTestCase, self).setUp()
self._start_compute(host="host1")
self._start_compute(host="host2")
self._start_compute(host="host3")
flavors = self.api.get_flavors()
self.flavor1 = flavors[0]
def test_boot_with_az_and_host_then_migrate_re_schedules(self):
"""Ensure that re-schedule is possible on migration even if the server
is originally booted with forced host.
The _boot_and_check_allocations() will start a server forced to host1.
Then a migration is triggered. Both host2 and host3 are valid targets.
But the test mocks resize_claim to make the first dest host fail and
expects that nova will try the alternative host.
"""
server = self._boot_and_check_allocations(
self.flavor1, 'host1')
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 expect to be rescheduled.
self.api.post_server_action(server['id'], {'migrate': None})
# We expect that the instance re-scheduled but successfully ended
# up on the second destination host.
self._wait_for_server_parameter(server, {
'OS-EXT-STS:task_state': None,
'status': 'VERIFY_RESIZE'})
# we ensure that there was a failed and then a successful claim call
self.assertEqual(2, len(claim_calls))
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