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# Copyright (c) 2012 OpenStack, LLC.
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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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# http://www.apache.org/licenses/LICENSE-2.0
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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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from nova.openstack.common import log as logging
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from nova.scheduler import filters
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LOG = logging.getLogger(__name__)
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class RetryFilter(filters.BaseHostFilter):
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"""Filter out hosts that have already been attempted for scheduling
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def host_passes(self, host_state, filter_properties):
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"""Skip hosts that have already been attempted"""
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retry = filter_properties.get('retry', None)
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# Re-scheduling is disabled
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LOG.debug("Re-scheduling is disabled")
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hosts = retry.get('hosts', [])
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host = host_state.host
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LOG.debug(_("Previously tried hosts: %(hosts)s. (host=%(host)s)") %
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# Host passes if it's not in the list of previously attempted hosts:
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return host not in hosts
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nova/scheduler/filters/retry_filter.py
