Affiniy/anti-affinity costs for soft affinity placement in solver scheduler
This enables solver scheduler to do soft affinity placement by adding two cost classes: affinity cost and anti-affinity cost. User can specify scheduler hint soft_same_host/soft_different_host=<a_list_of_instance_uuids>. The scheduler will tend to put instances in same/different hosts as those existing instances specified by user. If no instance uuid is provided, then scheduler should tend to schedule all requested instances in same/different hosts. The affinity and anti-affinity costs are not treated as hard restrictions which means if there is no host that can meet the same/different host requirements then other hosts may be chosen. Change-Id: Ie12af12d6e11c1dd815a2b1a81ef5376a02be057
This commit is contained in:
Xinyuan Huang
parent
b23f88bae4
commit
d7dfdb18db
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# Copyright (c) 2015 Cisco Systems, Inc.
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# All Rights Reserved.
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#
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# 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 six
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from oslo_config import cfg
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from oslo_log import log as logging
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from nova.i18n import _
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from nova_solverscheduler.scheduler.solvers import costs as solver_costs
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from nova_solverscheduler.scheduler.solvers import utils as solver_utils
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affinity_cost_opts = [
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cfg.FloatOpt('affinity_cost_multiplier',
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default=1.0,
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help='Multiplier used for affinity cost. Must be a '
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'positive number.'),
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cfg.FloatOpt('anti_affinity_cost_multiplier',
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default=1.0,
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help='Multiplier used for anti-affinity cost. Must be '
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'a positive number.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(affinity_cost_opts, group='solver_scheduler')
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LOG = logging.getLogger(__name__)
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class AffinityCost(solver_costs.BaseLinearCost):
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def __init__(self):
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super(AffinityCost, self).__init__()
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def cost_multiplier(self):
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return CONF.solver_scheduler.affinity_cost_multiplier
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def get_extended_cost_matrix(self, hosts, filter_properties):
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num_hosts = len(hosts)
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num_instances = filter_properties.get('num_instances')
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multiplier = self.cost_multiplier()
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if multiplier == 0:
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extended_cost_matrix = [[0 for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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return extended_cost_matrix
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scheduler_hints = filter_properties.get('scheduler_hints') or {}
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affinity_uuids = scheduler_hints.get('soft_same_host', [])
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if affinity_uuids == '':
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extended_cost_matrix = [[float(-j) / multiplier
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for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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LOG.debug(_('No instance specified for AffinityCost.'))
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return extended_cost_matrix
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if isinstance(affinity_uuids, six.string_types):
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affinity_uuids = [affinity_uuids]
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if affinity_uuids:
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extended_cost_matrix = [[1 - (float(j) / multiplier)
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for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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for i in xrange(num_hosts):
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if solver_utils.instance_uuids_overlap(hosts[i],
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affinity_uuids):
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extended_cost_matrix[i] = [float(-j) / multiplier for j in
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xrange(num_instances + 1)]
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else:
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extended_cost_matrix = [[0 for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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return extended_cost_matrix
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class AntiAffinityCost(solver_costs.BaseLinearCost):
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def __init__(self):
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super(AntiAffinityCost, self).__init__()
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def cost_multiplier(self):
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return CONF.solver_scheduler.anti_affinity_cost_multiplier
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def get_extended_cost_matrix(self, hosts, filter_properties):
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num_hosts = len(hosts)
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num_instances = filter_properties.get('num_instances')
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multiplier = self.cost_multiplier()
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if multiplier == 0:
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extended_cost_matrix = [[0 for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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return extended_cost_matrix
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scheduler_hints = filter_properties.get('scheduler_hints') or {}
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affinity_uuids = scheduler_hints.get('soft_different_host', [])
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if affinity_uuids == '':
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extended_cost_matrix = [[float(j) / multiplier
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for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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LOG.debug(_('No instance specified for AntiAffinityCost.'))
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return extended_cost_matrix
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if isinstance(affinity_uuids, six.string_types):
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affinity_uuids = [affinity_uuids]
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if affinity_uuids:
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extended_cost_matrix = [[float(j) / multiplier
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for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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for i in xrange(num_hosts):
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if solver_utils.instance_uuids_overlap(hosts[i],
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affinity_uuids):
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extended_cost_matrix[i] = [1 + (float(j) / multiplier)
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for j in xrange(num_instances + 1)]
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else:
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extended_cost_matrix = [[0 for j in xrange(num_instances + 1)]
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for i in xrange(num_hosts)]
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return extended_cost_matrix
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@ -0,0 +1,400 @@
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# Copyright (c) 2014 Cisco Systems, Inc.
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# All Rights Reserved.
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#
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# 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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"""Test case for solver scheduler affinity-cost."""
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from nova import context
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from nova import objects
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from nova import test
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from nova_solverscheduler.scheduler.solvers import costs
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from nova_solverscheduler.scheduler.solvers.costs import affinity_cost
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from nova_solverscheduler.tests.scheduler import solver_scheduler_fakes \
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as fakes
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class TestAffinityCost(test.NoDBTestCase):
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USES_DB = True
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def setUp(self):
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super(TestAffinityCost, self).setUp()
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self.context = context.RequestContext('fake_usr', 'fake_proj')
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self.cost_handler = costs.CostHandler()
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self.cost_classes = self.cost_handler.get_matching_classes(
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['nova_solverscheduler.scheduler.solvers.costs.'
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'affinity_cost.AffinityCost'])
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def _get_fake_hosts(self):
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host1 = fakes.FakeSolverSchedulerHostState('host1', 'node1', {})
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host2 = fakes.FakeSolverSchedulerHostState('host2', 'node2', {})
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host3 = fakes.FakeSolverSchedulerHostState('host3', 'node3', {})
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host4 = fakes.FakeSolverSchedulerHostState('host4', 'node4', {})
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return [host1, host2, host3, host4]
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def test_affinity_cost_multiplier(self):
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self.flags(affinity_cost_multiplier=0.5, group='solver_scheduler')
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self.assertEqual(0.5, affinity_cost.AffinityCost().cost_multiplier())
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def test_get_extended_cost_matrix_one_inst(self):
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fake_hosts = self._get_fake_hosts()
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instance = objects.Instance(uuid='inst1')
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instance_uuid = instance.uuid
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# let this instance be in host2
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fake_hosts[1].instances = {instance_uuid: instance}
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_same_host': instance_uuid}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[1, 0, -1, -2],
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[0, -1, -2, -3],
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[1, 0, -1, -2],
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[1, 0, -1, -2]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_multi_inst(self):
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fake_hosts = self._get_fake_hosts()
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instance1 = objects.Instance(uuid='inst1')
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instance2 = objects.Instance(uuid='inst2')
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instance1_uuid = instance1.uuid
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instance2_uuid = instance2.uuid
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# let these instances be in host1 and host3
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fake_hosts[0].instances = {instance1_uuid: instance1}
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fake_hosts[2].instances = {instance2_uuid: instance2}
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_same_host':
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[instance1_uuid, instance2_uuid]}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[0, -1, -2, -3],
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[1, 0, -1, -2],
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[0, -1, -2, -3],
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[1, 0, -1, -2]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_change_multiplier(self):
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self.flags(affinity_cost_multiplier=0.5, group='solver_scheduler')
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fake_hosts = self._get_fake_hosts()
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instance1 = objects.Instance(uuid='inst1')
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instance2 = objects.Instance(uuid='inst2')
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instance1_uuid = instance1.uuid
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instance2_uuid = instance2.uuid
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# let these instances be in host1 and host3
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fake_hosts[0].instances = {instance1_uuid: instance1}
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fake_hosts[2].instances = {instance2_uuid: instance2}
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_same_host':
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[instance1_uuid, instance2_uuid]}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[0, -2, -4, -6],
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[1, -1, -3, -5],
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[0, -2, -4, -6],
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[1, -1, -3, -5]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_zero_multiplier(self):
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self.flags(affinity_cost_multiplier=0, group='solver_scheduler')
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fake_hosts = self._get_fake_hosts()
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instance = objects.Instance(uuid='inst1')
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instance_uuid = instance.uuid
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# let this instance be in host2
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fake_hosts[1].instances = {instance_uuid: instance}
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_same_host': instance_uuid}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_no_instance_list(self):
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fake_hosts = self._get_fake_hosts()
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_same_host': ''}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[-0, -1, -2, -3],
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[-0, -1, -2, -3],
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[-0, -1, -2, -3],
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[-0, -1, -2, -3]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_no_hint(self):
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fake_hosts = self._get_fake_hosts()
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0],
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[0, 0, 0, 0]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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class TestAntiAffinityCost(test.NoDBTestCase):
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USES_DB = True
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def setUp(self):
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super(TestAntiAffinityCost, self).setUp()
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self.context = context.RequestContext('fake_usr', 'fake_proj')
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self.cost_handler = costs.CostHandler()
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self.cost_classes = self.cost_handler.get_matching_classes(
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['nova_solverscheduler.scheduler.solvers.costs.'
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'affinity_cost.AntiAffinityCost'])
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def _get_fake_hosts(self):
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host1 = fakes.FakeSolverSchedulerHostState('host1', 'node1', {})
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host2 = fakes.FakeSolverSchedulerHostState('host2', 'node2', {})
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host3 = fakes.FakeSolverSchedulerHostState('host3', 'node3', {})
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host4 = fakes.FakeSolverSchedulerHostState('host4', 'node4', {})
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return [host1, host2, host3, host4]
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def test_anti_affinity_cost_multiplier(self):
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self.flags(anti_affinity_cost_multiplier=2, group='solver_scheduler')
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self.assertEqual(2,
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affinity_cost.AntiAffinityCost().cost_multiplier())
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def test_get_extended_cost_matrix_one_inst(self):
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fake_hosts = self._get_fake_hosts()
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instance = objects.Instance(uuid='inst1')
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instance_uuid = instance.uuid
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# let this instance be in host2
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fake_hosts[1].instances = {instance_uuid: instance}
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_different_host': instance_uuid}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[0, 1, 2, 3],
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[1, 2, 3, 4],
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[0, 1, 2, 3],
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[0, 1, 2, 3]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_multi_inst(self):
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fake_hosts = self._get_fake_hosts()
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instance1 = objects.Instance(uuid='inst1')
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instance2 = objects.Instance(uuid='inst2')
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instance1_uuid = instance1.uuid
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instance2_uuid = instance2.uuid
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# let these instances be in host1 and host3
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fake_hosts[0].instances = {instance1_uuid: instance1}
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fake_hosts[2].instances = {instance2_uuid: instance2}
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fake_filter_properties = {
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'context': self.context.elevated(),
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'num_instances': 3,
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'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
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'scheduler_hints': {'soft_different_host':
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[instance1_uuid, instance2_uuid]}
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}
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fake_cost = self.cost_classes[0]()
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expected_x_cost_mat = [
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[1, 2, 3, 4],
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[0, 1, 2, 3],
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[1, 2, 3, 4],
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[0, 1, 2, 3]]
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x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
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fake_filter_properties)
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self.assertEqual(expected_x_cost_mat, x_cost_mat)
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def test_get_extended_cost_matrix_change_multiplier(self):
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self.flags(anti_affinity_cost_multiplier=0.5,
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group='solver_scheduler')
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fake_hosts = self._get_fake_hosts()
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instance1 = objects.Instance(uuid='inst1')
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instance2 = objects.Instance(uuid='inst2')
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||||
instance1_uuid = instance1.uuid
|
||||
instance2_uuid = instance2.uuid
|
||||
# let these instances be in host1 and host3
|
||||
fake_hosts[0].instances = {instance1_uuid: instance1}
|
||||
fake_hosts[2].instances = {instance2_uuid: instance2}
|
||||
|
||||
fake_filter_properties = {
|
||||
'context': self.context.elevated(),
|
||||
'num_instances': 3,
|
||||
'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
|
||||
'scheduler_hints': {'soft_different_host':
|
||||
[instance1_uuid, instance2_uuid]}
|
||||
}
|
||||
|
||||
fake_cost = self.cost_classes[0]()
|
||||
|
||||
expected_x_cost_mat = [
|
||||
[1, 3, 5, 7],
|
||||
[0, 2, 4, 6],
|
||||
[1, 3, 5, 7],
|
||||
[0, 2, 4, 6]]
|
||||
|
||||
x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
|
||||
fake_filter_properties)
|
||||
self.assertEqual(expected_x_cost_mat, x_cost_mat)
|
||||
|
||||
def test_get_extended_cost_matrix_zero_multiplier(self):
|
||||
self.flags(anti_affinity_cost_multiplier=0, group='solver_scheduler')
|
||||
|
||||
fake_hosts = self._get_fake_hosts()
|
||||
|
||||
instance = objects.Instance(uuid='inst1')
|
||||
instance_uuid = instance.uuid
|
||||
# let this instance be in host2
|
||||
fake_hosts[1].instances = {instance_uuid: instance}
|
||||
|
||||
fake_filter_properties = {
|
||||
'context': self.context.elevated(),
|
||||
'num_instances': 3,
|
||||
'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
|
||||
'scheduler_hints': {'soft_different_host': instance_uuid}
|
||||
}
|
||||
|
||||
fake_cost = self.cost_classes[0]()
|
||||
|
||||
expected_x_cost_mat = [
|
||||
[0, 0, 0, 0],
|
||||
[0, 0, 0, 0],
|
||||
[0, 0, 0, 0],
|
||||
[0, 0, 0, 0]]
|
||||
|
||||
x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
|
||||
fake_filter_properties)
|
||||
self.assertEqual(expected_x_cost_mat, x_cost_mat)
|
||||
|
||||
def test_get_extended_cost_matrix_no_instance_list(self):
|
||||
fake_hosts = self._get_fake_hosts()
|
||||
|
||||
fake_filter_properties = {
|
||||
'context': self.context.elevated(),
|
||||
'num_instances': 3,
|
||||
'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
|
||||
'scheduler_hints': {'soft_different_host': ''}
|
||||
}
|
||||
|
||||
fake_cost = self.cost_classes[0]()
|
||||
|
||||
expected_x_cost_mat = [
|
||||
[0, 1, 2, 3],
|
||||
[0, 1, 2, 3],
|
||||
[0, 1, 2, 3],
|
||||
[0, 1, 2, 3]]
|
||||
|
||||
x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
|
||||
fake_filter_properties)
|
||||
self.assertEqual(expected_x_cost_mat, x_cost_mat)
|
||||
|
||||
def test_get_extended_cost_matrix_no_hint(self):
|
||||
fake_hosts = self._get_fake_hosts()
|
||||
|
||||
fake_filter_properties = {
|
||||
'context': self.context.elevated(),
|
||||
'num_instances': 3,
|
||||
'instance_uuids': ['fake_uuid_%s' % x for x in range(3)],
|
||||
'scheduler_hints': {}
|
||||
}
|
||||
|
||||
fake_cost = self.cost_classes[0]()
|
||||
|
||||
expected_x_cost_mat = [
|
||||
[0, 0, 0, 0],
|
||||
[0, 0, 0, 0],
|
||||
[0, 0, 0, 0],
|
||||
[0, 0, 0, 0]]
|
||||
|
||||
x_cost_mat = fake_cost.get_extended_cost_matrix(fake_hosts,
|
||||
fake_filter_properties)
|
||||
self.assertEqual(expected_x_cost_mat, x_cost_mat)
|
||||
Loading…
Reference in New Issue