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Adding service affinity predicate

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This commit is contained in:
Abhishek Gupta
2014-12-22 15:55:31 -08:00
parent 9dd7d2a0a1
commit 3f722a3d8e
4 changed files with 251 additions and 4 deletions
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46
plugin/pkg/scheduler/algorithmprovider/affinity/affinity.go Normal file
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@@ -0,0 +1,46 @@
/*
Copyright 2014 Google Inc. 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.
*/
// This algorithm provider has predicates and priorities related to affinity/anti-affinity for the scheduler.
package affinity
import (
algorithm "github.com/GoogleCloudPlatform/kubernetes/pkg/scheduler"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
"github.com/GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/factory"
)
const Provider string = "AffinityProvider"
func init() {
factory.RegisterAlgorithmProvider(Provider, defaultPredicates(), defaultPriorities())
}
func defaultPredicates() util.StringSet {
return util.NewStringSet(
// Fit is defined based on whether the minion has the specified label values as the pod being scheduled
// Alternately, if the pod does not specify any/all labels, the other pods in the service are looked at
factory.RegisterFitPredicate("ServiceAffinity", algorithm.NewServiceAffinityPredicate(factory.PodLister, factory.ServiceLister, factory.MinionLister, []string{"region"})),
)
}
func defaultPriorities() util.StringSet {
return util.NewStringSet(
// spreads pods belonging to the same service across minions in different zones
// region and zone can be nested infrastructure topology levels and defined by labels on minions
factory.RegisterPriorityFunction("ZoneSpreadingPriority", algorithm.NewServiceAntiAffinityPriority(factory.ServiceLister, "zone"), 1),
)
}

3
plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go
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@@ -48,9 +48,6 @@ func defaultPriorities() util.StringSet {
factory.RegisterPriorityFunction("LeastRequestedPriority", algorithm.LeastRequestedPriority, 1),
// spreads pods by minimizing the number of pods (belonging to the same service) on the same minion.
factory.RegisterPriorityFunction("ServiceSpreadingPriority", algorithm.NewServiceSpreadPriority(factory.ServiceLister), 1),
// spreads pods belonging to the same service across minions in different zones
// TODO: remove the hardcoding of the "zone" label and move it to a constant
factory.RegisterPriorityFunction("ZoneSpreadingPriority", algorithm.NewServiceAntiAffinityPriority(factory.ServiceLister, "zone"), 1),
// EqualPriority is a prioritizer function that gives an equal weight of one to all minions
factory.RegisterPriorityFunction("EqualPriority", algorithm.EqualPriority, 0),
)