76 lines
2.7 KiB
Python
76 lines
2.7 KiB
Python
# Copyright (c) 2011 OpenStack Foundation
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""
|
|
Metrics Weigher. Weigh hosts by their metrics.
|
|
|
|
This weigher can compute the weight based on the compute node host's various
|
|
metrics. The to-be weighed metrics and their weighing ratio are specified
|
|
in the configuration file as the followings:
|
|
|
|
[metrics]
|
|
weight_setting = name1=1.0, name2=-1.0
|
|
|
|
The final weight would be name1.value * 1.0 + name2.value * -1.0.
|
|
"""
|
|
|
|
import nova.conf
|
|
from nova import exception
|
|
from nova.scheduler import utils
|
|
from nova.scheduler import weights
|
|
|
|
|
|
CONF = nova.conf.CONF
|
|
|
|
|
|
class MetricsWeigher(weights.BaseHostWeigher):
|
|
def __init__(self):
|
|
self._parse_setting()
|
|
|
|
def _parse_setting(self):
|
|
self.setting = utils.parse_options(CONF.metrics.weight_setting,
|
|
sep='=',
|
|
converter=float,
|
|
name="metrics.weight_setting")
|
|
|
|
def weight_multiplier(self):
|
|
"""Override the weight multiplier."""
|
|
return CONF.metrics.weight_multiplier
|
|
|
|
def _weigh_object(self, host_state, weight_properties):
|
|
value = 0.0
|
|
|
|
# NOTE(sbauza): Keying a dict of Metrics per metric name given that we
|
|
# have a MonitorMetricList object
|
|
metrics_dict = {m.name: m for m in host_state.metrics or []}
|
|
for (name, ratio) in self.setting:
|
|
try:
|
|
value += metrics_dict[name].value * ratio
|
|
except KeyError:
|
|
if CONF.metrics.required:
|
|
raise exception.ComputeHostMetricNotFound(
|
|
host=host_state.host,
|
|
node=host_state.nodename,
|
|
name=name)
|
|
else:
|
|
# We treat the unavailable metric as the most negative
|
|
# factor, i.e. set the value to make this obj would be
|
|
# at the end of the ordered weighed obj list
|
|
# Do nothing if ratio or weight_multiplier is 0.
|
|
if ratio * self.weight_multiplier() != 0:
|
|
return CONF.metrics.weight_of_unavailable
|
|
|
|
return value
|