78 lines
3.0 KiB
Python
78 lines
3.0 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import mock
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import nova
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from nova import exception
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from nova.tests.functional import integrated_helpers
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class ForcedHostMissingReScheduleTestCase(
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integrated_helpers.ProviderUsageBaseTestCase):
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compute_driver = 'fake.SmallFakeDriver'
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def setUp(self):
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super(ForcedHostMissingReScheduleTestCase, self).setUp()
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self._start_compute(host="host1")
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self._start_compute(host="host2")
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self._start_compute(host="host3")
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flavors = self.api.get_flavors()
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self.flavor1 = flavors[0]
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def test_boot_with_az_and_host_then_migrate_re_schedules(self):
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"""Ensure that re-schedule is possible on migration even if the server
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is originally booted with forced host.
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The _boot_and_check_allocations() will start a server forced to host1.
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Then a migration is triggered. Both host2 and host3 are valid targets.
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But the test mocks resize_claim to make the first dest host fail and
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expects that nova will try the alternative host.
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"""
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server = self._boot_and_check_allocations(
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self.flavor1, 'host1')
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orig_claim = nova.compute.resource_tracker.ResourceTracker.resize_claim
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claim_calls = []
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def fake_orig_claim(
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_self, context, instance, flavor, nodename,
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*args, **kwargs,
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):
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if not claim_calls:
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claim_calls.append(nodename)
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raise exception.ComputeResourcesUnavailable(
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reason='Simulated claim failure')
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else:
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claim_calls.append(nodename)
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return orig_claim(
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_self, context, instance, flavor, nodename, *args,
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**kwargs)
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with mock.patch(
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'nova.compute.resource_tracker.ResourceTracker.resize_claim',
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new=fake_orig_claim):
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# Now migrate the server which is going to fail on the first
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# destination but then will expect to be rescheduled.
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self.api.post_server_action(server['id'], {'migrate': None})
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# We expect that the instance re-scheduled but successfully ended
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# up on the second destination host.
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self._wait_for_server_parameter(server, {
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'OS-EXT-STS:task_state': None,
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'status': 'VERIFY_RESIZE'})
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# we ensure that there was a failed and then a successful claim call
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self.assertEqual(2, len(claim_calls))
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