77 lines
2.8 KiB
Python
77 lines
2.8 KiB
Python
# Copyright (c) 2012 OpenStack Foundation
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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_log import log as logging
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import nova.conf
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from nova.i18n import _LW
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from nova.scheduler import filters
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from nova.scheduler.filters import utils
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LOG = logging.getLogger(__name__)
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CONF = nova.conf.CONF
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class NumInstancesFilter(filters.BaseHostFilter):
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"""Filter out hosts with too many instances."""
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def _get_max_instances_per_host(self, host_state, spec_obj):
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return CONF.filter_scheduler.max_instances_per_host
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def host_passes(self, host_state, spec_obj):
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num_instances = host_state.num_instances
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max_instances = self._get_max_instances_per_host(
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host_state, spec_obj)
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passes = num_instances < max_instances
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if not passes:
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LOG.debug("%(host_state)s fails num_instances check: Max "
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"instances per host is set to %(max_instances)s",
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{'host_state': host_state,
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'max_instances': max_instances})
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return passes
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class AggregateNumInstancesFilter(NumInstancesFilter):
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"""AggregateNumInstancesFilter with per-aggregate the max num instances.
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Fall back to global max_num_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, spec_obj):
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max_instances_per_host = CONF.filter_scheduler.max_instances_per_host
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# TODO(sfinucan): Remove this warning when the named config options
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# gains a 'min' parameter.
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if max_instances_per_host < 1:
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LOG.warning(_LW('Future versions of nova will restrict the '
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'"filter_scheduler.max_instances_per_host" config option to '
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'values >=0. Update your configuration file to mitigate '
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'future upgrade issues.'))
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aggregate_vals = utils.aggregate_values_from_key(
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host_state,
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'max_instances_per_host')
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try:
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value = utils.validate_num_values(
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aggregate_vals, 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 = max_instances_per_host
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return value
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