108 lines
4.5 KiB
Python
108 lines
4.5 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]
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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.scheduler import utils
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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 metrics 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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cfg.BoolOpt('required',
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default=True,
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help='How to treat the unavailable metrics. When a '
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'metric is NOT available for a host, if it is set '
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'to be True, it would raise an exception, so it '
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'is recommended to use the scheduler filter '
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'MetricFilter to filter out those hosts. If it is '
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'set to be False, the unavailable metric would be '
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'treated as a negative factor in weighing '
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'process, the returned value would be set by '
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'the option weight_of_unavailable.'),
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cfg.FloatOpt('weight_of_unavailable',
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default=float(-10000.0),
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help='The final weight value to be returned if '
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'required is set to False and any one of the '
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'metrics set by weight_setting is unavailable.'),
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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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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 = utils.parse_options(CONF.metrics.weight_setting,
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sep='=',
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converter=float,
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name="metrics.weight_setting")
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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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# NOTE(sbauza): Keying a dict of Metrics per metric name given that we
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# have a MonitorMetricList object
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metrics_dict = {m.name: m for m in host_state.metrics}
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for (name, ratio) in self.setting:
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try:
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value += metrics_dict[name].value * ratio
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except KeyError:
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if CONF.metrics.required:
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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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else:
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# We treat the unavailable metric as the most negative
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# factor, i.e. set the value to make this obj would be
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# at the end of the ordered weighed obj list
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# Do nothing if ratio or weight_multiplier is 0.
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if ratio * self.weight_multiplier() != 0:
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return CONF.metrics.weight_of_unavailable
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return value
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