77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
# Copyright (c) 2015 Ericsson AB
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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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"""
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Affinity Weighers. Weigh hosts by the number of instances from a given host.
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AffinityWeigher implements the soft-affinity policy for server groups by
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preferring the hosts that has more instances from the given group.
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AntiAffinityWeigher implements the soft-anti-affinity policy for server groups
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by preferring the hosts that has less instances from the given group.
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"""
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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.scheduler import utils
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from nova.scheduler import weights
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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class _SoftAffinityWeigherBase(weights.BaseHostWeigher):
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policy_name = None
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def _weigh_object(self, host_state, request_spec):
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"""Higher weights win."""
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if not request_spec.instance_group:
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return 0
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policy = request_spec.instance_group.policy
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if self.policy_name != policy:
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return 0
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instances = set(host_state.instances.keys())
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members = set(request_spec.instance_group.members)
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member_on_host = instances.intersection(members)
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return len(member_on_host)
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class ServerGroupSoftAffinityWeigher(_SoftAffinityWeigherBase):
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policy_name = 'soft-affinity'
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def weight_multiplier(self, host_state):
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return utils.get_weight_multiplier(
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host_state, 'soft_affinity_weight_multiplier',
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CONF.filter_scheduler.soft_affinity_weight_multiplier)
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class ServerGroupSoftAntiAffinityWeigher(_SoftAffinityWeigherBase):
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policy_name = 'soft-anti-affinity'
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def weight_multiplier(self, host_state):
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return utils.get_weight_multiplier(
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host_state, 'soft_anti_affinity_weight_multiplier',
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CONF.filter_scheduler.soft_anti_affinity_weight_multiplier)
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def _weigh_object(self, host_state, request_spec):
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weight = super(ServerGroupSoftAntiAffinityWeigher, self)._weigh_object(
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host_state, request_spec)
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return -1 * weight
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