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OpenStack Study: weight_offset.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012-2013 Rackspace Hosting # 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. """ Weigh cells by their weight_offset in the DB. Cells with higher weight_offsets in the DB will be preferred. """ from oslo.config import cfg from nova.cells import weights weigher_opts = [ cfg.FloatOpt('offset_weight_multiplier', default=1.0, help='Multiplier used to weigh offset weigher.'), ] CONF = cfg.CONF CONF.register_opts(weigher_opts, group='cells')
**** CubicPower OpenStack Study **** class WeightOffsetWeigher(weights.BaseCellWeigher): """Weight cell by weight_offset db field. Originally designed so you can set a
**** CubicPower OpenStack Study **** def weight_multiplier(self): return CONF.cells.offset_weight_multiplier
**** CubicPower OpenStack Study **** def _weigh_object(self, cell, weight_properties): """Returns whatever was in the DB for weight_offset.""" return cell.db_info.get('weight_offset', 0)
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