86 lines
3.3 KiB
Go
86 lines
3.3 KiB
Go
/*
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Copyright 2022 The Karmada Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package spreadconstraint
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import (
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"fmt"
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"k8s.io/klog/v2"
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clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
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policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
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)
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// SelectBestClusters selects the cluster set based the GroupClustersInfo and placement
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func SelectBestClusters(placement *policyv1alpha1.Placement, groupClustersInfo *GroupClustersInfo, needReplicas int32) ([]*clusterv1alpha1.Cluster, error) {
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if len(placement.SpreadConstraints) == 0 || shouldIgnoreSpreadConstraint(placement) {
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var clusters []*clusterv1alpha1.Cluster
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for _, cluster := range groupClustersInfo.Clusters {
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clusters = append(clusters, cluster.Cluster)
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}
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klog.V(4).Infof("Select all clusters")
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return clusters, nil
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}
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if shouldIgnoreAvailableResource(placement) {
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needReplicas = InvalidReplicas
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}
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return selectBestClustersBySpreadConstraints(placement.SpreadConstraints, groupClustersInfo, needReplicas)
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}
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func selectBestClustersBySpreadConstraints(spreadConstraints []policyv1alpha1.SpreadConstraint,
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groupClustersInfo *GroupClustersInfo, needReplicas int32) ([]*clusterv1alpha1.Cluster, error) {
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spreadConstraintMap := make(map[policyv1alpha1.SpreadFieldValue]policyv1alpha1.SpreadConstraint)
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for i := range spreadConstraints {
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spreadConstraintMap[spreadConstraints[i].SpreadByField] = spreadConstraints[i]
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}
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if _, exist := spreadConstraintMap[policyv1alpha1.SpreadByFieldRegion]; exist {
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return selectBestClustersByRegion(spreadConstraintMap, groupClustersInfo)
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} else if _, exist := spreadConstraintMap[policyv1alpha1.SpreadByFieldCluster]; exist {
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return selectBestClustersByCluster(spreadConstraintMap[policyv1alpha1.SpreadByFieldCluster], groupClustersInfo, needReplicas)
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}
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return nil, fmt.Errorf("just support cluster and region spread constraint")
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}
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func shouldIgnoreSpreadConstraint(placement *policyv1alpha1.Placement) bool {
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strategy := placement.ReplicaScheduling
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// If the replica division preference is 'static weighted', ignore the declaration specified by spread constraints.
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if strategy != nil && strategy.ReplicaSchedulingType == policyv1alpha1.ReplicaSchedulingTypeDivided &&
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strategy.ReplicaDivisionPreference == policyv1alpha1.ReplicaDivisionPreferenceWeighted &&
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(strategy.WeightPreference == nil ||
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len(strategy.WeightPreference.StaticWeightList) != 0 && strategy.WeightPreference.DynamicWeight == "") {
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return true
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}
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return false
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}
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func shouldIgnoreAvailableResource(placement *policyv1alpha1.Placement) bool {
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strategy := placement.ReplicaScheduling
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// If the replica division preference is 'Duplicated', ignore the information about cluster available resource.
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if strategy == nil || strategy.ReplicaSchedulingType == policyv1alpha1.ReplicaSchedulingTypeDuplicated {
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return true
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}
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return false
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}
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