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Diffstat (limited to 'nova/scheduler/weights/hypervisor_version.py')
| -rw-r--r-- | nova/scheduler/weights/hypervisor_version.py | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/nova/scheduler/weights/hypervisor_version.py b/nova/scheduler/weights/hypervisor_version.py new file mode 100644 index 0000000000..0cd7b0a824 --- /dev/null +++ b/nova/scheduler/weights/hypervisor_version.py @@ -0,0 +1,39 @@ +# 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. + +""" +Hypervisor Version Weigher. Weigh hosts by their relative hypervior version. + +The default is to select newer hosts. If you prefer +to invert the behavior set the 'hypervisor_version_weight_multiplier' option +to a negative number and the weighing has the opposite effect of the default. +""" + +import nova.conf +from nova.scheduler import utils +from nova.scheduler import weights + +CONF = nova.conf.CONF + + +class HypervisorVersionWeigher(weights.BaseHostWeigher): + + def weight_multiplier(self, host_state): + """Override the weight multiplier.""" + return utils.get_weight_multiplier( + host_state, 'hypervisor_version_weight_multiplier', + CONF.filter_scheduler.hypervisor_version_weight_multiplier) + + def _weigh_object(self, host_state, weight_properties): + """Higher weights win. We want newer hosts by default.""" + # convert None to 0 + return host_state.hypervisor_version or 0 |