61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
# Copyright (c) 2013 Rackspace Hosting
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# All Rights Reserved.
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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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"""
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If a child cell hasn't sent capacity or capability updates in a while,
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downgrade its likelihood of being chosen for scheduling requests.
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"""
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from oslo_log import log as logging
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from oslo_utils import timeutils
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from nova.cells import weights
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import nova.conf
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from nova.i18n import _LW
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LOG = logging.getLogger(__name__)
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CONF = nova.conf.CONF
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class MuteChildWeigher(weights.BaseCellWeigher):
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"""If a child cell hasn't been heard from, greatly lower its selection
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weight.
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"""
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MUTE_WEIGH_VALUE = 1.0
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def weight_multiplier(self):
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# negative multiplier => lower weight
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return CONF.cells.mute_weight_multiplier
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def _weigh_object(self, cell, weight_properties):
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"""Check cell against the last_seen timestamp that indicates the time
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that the most recent capability or capacity update was received from
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the given cell.
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"""
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last_seen = cell.last_seen
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secs = CONF.cells.mute_child_interval
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if timeutils.is_older_than(last_seen, secs):
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# yep, that's a mute child; recommend highly that it be skipped!
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LOG.warning(_LW("%(cell)s has not been seen since %(last_seen)s "
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"and is being treated as mute."),
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{'cell': cell, 'last_seen': last_seen})
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return self.MUTE_WEIGH_VALUE
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else:
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return 0
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