72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
# 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
|