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# Copyright (c) 2013 Rackspace Hosting
# 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.
"""
If a child cell hasn't sent capacity or capability updates in a while,
downgrade its likelihood of being chosen for scheduling requests.
"""
from oslo.config import cfg
from nova.cells import weights
from nova.openstack.common.gettextutils import _
from nova.openstack.common import log as logging
from nova.openstack.common import timeutils
LOG = logging.getLogger(__name__)
mute_weigher_opts = [
cfg.FloatOpt('mute_weight_multiplier',
default=-10.0,
help='Multiplier used to weigh mute children. (The value '
'should be negative.)'),
cfg.FloatOpt('mute_weight_value',
default=1000.0,
help='Weight value assigned to mute children. (The value '
'should be positive.)'),
]
CONF = cfg.CONF
CONF.import_opt('mute_child_interval', 'nova.cells.opts', group='cells')
CONF.register_opts(mute_weigher_opts, group='cells')
class MuteChildWeigher(weights.BaseCellWeigher):
"""If a child cell hasn't been heard from, greatly lower its selection
weight.
"""
def weight_multiplier(self):
# negative multiplier => lower weight
return CONF.cells.mute_weight_multiplier
def _weigh_object(self, cell, weight_properties):
"""Check cell against the last_seen timestamp that indicates the time
that the most recent capability or capacity update was received from
the given cell.
"""
last_seen = cell.last_seen
secs = CONF.cells.mute_child_interval
if timeutils.is_older_than(last_seen, secs):
# yep, that's a mute child; recommend highly that it be skipped!
LOG.warn(_("%(cell)s has not been seen since %(last_seen)s and is "
"being treated as mute."),
{'cell': cell, 'last_seen': last_seen})
return CONF.cells.mute_weight_value
else:
return 0
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