48 lines
1.8 KiB
Python
48 lines
1.8 KiB
Python
# Copyright 2016 Red Hat, Inc.
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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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from nova.scheduler import filters
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from oslo_log import log as logging
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LOG = logging.getLogger(__name__)
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class TripleOCapabilitiesFilter(filters.BaseHostFilter):
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"""Filter hosts based on capabilities in boot request
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The standard Nova ComputeCapabilitiesFilter does not respect capabilities
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requested in the scheduler_hints field, so we need a custom one in order
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to be able to do predictable placement of nodes.
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"""
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# list of hosts doesn't change within a request
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run_filter_once_per_request = True
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def host_passes(self, host_state, spec_obj):
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host_node = host_state.stats.get('node')
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instance_node = spec_obj.scheduler_hints.get('capabilities:node')
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# The instance didn't request a specific node
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if not instance_node:
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LOG.debug('No specific node requested')
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return True
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if host_node == instance_node[0]:
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LOG.debug('Node tagged %s matches requested node %s', host_node,
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instance_node[0])
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return True
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else:
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LOG.debug('Node tagged %s does not match requested node %s',
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host_node, instance_node[0])
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return False
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