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OpenStack Study: capacity_filter.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012 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. import math from cinder.openstack.common import log as logging from cinder.openstack.common.scheduler import filters LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** class CapacityFilter(filters.BaseHostFilter): """CapacityFilter filters based on volume host's capacity utilization."""
**** CubicPower OpenStack Study **** def host_passes(self, host_state, filter_properties): """Return True if host has sufficient capacity.""" # If the volume already exists on this host, don't fail it for # insufficient capacity (e.g., if we are retyping) if host_state.host == filter_properties.get('vol_exists_on'): return True volume_size = filter_properties.get('size') if host_state.free_capacity_gb is None: # Fail Safe LOG.error(_("Free capacity not set: " "volume node info collection broken.")) return False free_space = host_state.free_capacity_gb if free_space == 'infinite' or free_space == 'unknown': # NOTE(zhiteng) for those back-ends cannot report actual # available capacity, we assume it is able to serve the # request. Even if it was not, the retry mechanism is # able to handle the failure by rescheduling return True reserved = float(host_state.reserved_percentage) / 100 free = math.floor(free_space * (1 - reserved)) if free < volume_size: LOG.warning(_("Insufficient free space for volume creation " "(requested / avail): " "%(requested)s/%(available)s") % {'requested': volume_size, 'available': free}) return free >= volume_size
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