95 lines
3.3 KiB
Python
95 lines
3.3 KiB
Python
# Copyright (c) 2011 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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"""
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Metrics Weigher. Weigh hosts by their metrics.
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This weigher can compute the weight based on the compute node host's various
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metrics. The to-be weighed metrics and their weighing ratio are specified
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in the configuration file as the followings:
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metrics_weight_setting = name1=1.0, name2=-1.0
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The final weight would be name1.value * 1.0 + name2.value * -1.0.
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"""
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from oslo.config import cfg
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from nova import exception
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import log as logging
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from nova.scheduler import weights
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metrics_weight_opts = [
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cfg.FloatOpt('weight_multiplier',
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default=1.0,
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help='Multiplier used for weighing metrics.'),
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cfg.ListOpt('weight_setting',
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default=[],
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help='How the metrics are going to be weighed. This '
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'should be in the form of "<name1>=<ratio1>, '
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'<name2>=<ratio2>, ...", where <nameX> is one '
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'of the metric to be weighed, and <ratioX> is '
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'the corresponding ratio. So for "name1=1.0, '
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'name2=-1.0" The final weight would be '
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'name1.value * 1.0 + name2.value * -1.0.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(metrics_weight_opts, group='metrics')
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LOG = logging.getLogger(__name__)
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class MetricsWeigher(weights.BaseHostWeigher):
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def __init__(self):
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self._parse_setting()
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def _parse_setting(self):
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self.setting = []
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bad = []
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for item in CONF.metrics.weight_setting:
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try:
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(name, ratio) = item.split('=')
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ratio = float(ratio)
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except ValueError:
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name = None
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ratio = None
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if name and ratio is not None:
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self.setting.append((name, ratio))
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else:
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bad.append(item)
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if bad:
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LOG.error(_("Ignoring the invalid elements of"
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" metrics_weight_setting: %s"),
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",".join(bad))
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def _weight_multiplier(self):
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"""Override the weight multiplier."""
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return CONF.metrics.weight_multiplier
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def _weigh_object(self, host_state, weight_properties):
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value = 0.0
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for (name, ratio) in self.setting:
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try:
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value += host_state.metrics[name].value * ratio
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except KeyError:
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raise exception.ComputeHostMetricNotFound(
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host=host_state.host,
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node=host_state.nodename,
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name=name)
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return value
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