64 lines
2.9 KiB
Python
64 lines
2.9 KiB
Python
#
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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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Cross-cell move weigher. Weighs hosts based on which cell they are in. "Local"
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cells are preferred when moving an instance. In other words, select a host
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from the source cell all other things being equal.
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"""
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from nova import conf
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from nova.scheduler import utils
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from nova.scheduler import weights
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CONF = conf.CONF
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class CrossCellWeigher(weights.BaseHostWeigher):
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def weight_multiplier(self, host_state):
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"""How weighted this weigher should be."""
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return utils.get_weight_multiplier(
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host_state, 'cross_cell_move_weight_multiplier',
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CONF.filter_scheduler.cross_cell_move_weight_multiplier)
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def _weigh_object(self, host_state, weight_properties):
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"""Higher weights win. Hosts within the "preferred" cell are weighed
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higher than hosts in other cells.
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:param host_state: nova.scheduler.host_manager.HostState object
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representing a ComputeNode in a cell
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:param weight_properties: nova.objects.RequestSpec - this is inspected
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to see if there is a preferred cell via the requested_destination
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field and if so, is the request spec allowing cross-cell move
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:returns: 1 if cross-cell move and host_state is within the preferred
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cell, -1 if cross-cell move and host_state is *not* within the
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preferred cell, 0 for all other cases
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"""
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# RequestSpec.requested_destination.cell should only be set for
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# move operations. The allow_cross_cell_move value will only be True if
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# policy allows.
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if ('requested_destination' in weight_properties and
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weight_properties.requested_destination and
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'cell' in weight_properties.requested_destination and
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weight_properties.requested_destination.cell and
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weight_properties.requested_destination.allow_cross_cell_move):
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# Determine if the given host is in the "preferred" cell from
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# the request spec. If it is, weigh it higher.
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if (host_state.cell_uuid ==
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weight_properties.requested_destination.cell.uuid):
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return 1
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# The host is in another cell, so weigh it lower.
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return -1
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# We don't know or don't care what cell we're going to be in, so noop.
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return 0
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