53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
# 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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from oslo_config import cfg
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from oslo_log import log as logging
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from nova.i18n import _LW
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from nova_solverscheduler.scheduler.solvers.constraints \
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import num_instances_constraint
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from nova_solverscheduler.scheduler.solvers import utils
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CONF = cfg.CONF
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CONF.import_opt('max_instances_per_host',
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'nova.scheduler.filters.num_instances_filter')
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LOG = logging.getLogger(__name__)
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class AggregateNumInstancesConstraint(
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num_instances_constraint.NumInstancesConstraint):
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"""AggregateNumInstancesConstraint with per-aggregate max num instances
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per host.
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Fall back to global max_instances_per_host if no per-aggregate setting
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found.
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"""
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def _get_max_instances_per_host(self, host_state, filter_properties):
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aggregate_vals = utils.aggregate_values_from_key(
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host_state, 'max_instances_per_host')
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try:
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value = utils.validate_num_values(
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aggregate_vals, CONF.max_instances_per_host, cast_to=int)
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except ValueError as e:
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LOG.warning(_LW("Could not decode max_instances_per_host: '%s'"),
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e)
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value = CONF.max_instances_per_host
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return value
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