vendor files

vendor/k8s.io/kubernetes/pkg/controller/deployment/recreate.go

@@ -0,0 +1,118 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+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.
+*/
+
+package deployment
+
+import (
+	"k8s.io/api/core/v1"
+	extensions "k8s.io/api/extensions/v1beta1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/kubernetes/pkg/controller"
+	"k8s.io/kubernetes/pkg/controller/deployment/util"
+)
+
+// rolloutRecreate implements the logic for recreating a replica set.
+func (dc *DeploymentController) rolloutRecreate(d *extensions.Deployment, rsList []*extensions.ReplicaSet, podMap map[types.UID]*v1.PodList) error {
+	// Don't create a new RS if not already existed, so that we avoid scaling up before scaling down.
+	newRS, oldRSs, err := dc.getAllReplicaSetsAndSyncRevision(d, rsList, podMap, false)
+	if err != nil {
+		return err
+	}
+	allRSs := append(oldRSs, newRS)
+	activeOldRSs := controller.FilterActiveReplicaSets(oldRSs)
+
+	// scale down old replica sets.
+	scaledDown, err := dc.scaleDownOldReplicaSetsForRecreate(activeOldRSs, d)
+	if err != nil {
+		return err
+	}
+	if scaledDown {
+		// Update DeploymentStatus.
+		return dc.syncRolloutStatus(allRSs, newRS, d)
+	}
+
+	// Do not process a deployment when it has old pods running.
+	if oldPodsRunning(newRS, oldRSs, podMap) {
+		return dc.syncRolloutStatus(allRSs, newRS, d)
+	}
+
+	// If we need to create a new RS, create it now.
+	if newRS == nil {
+		newRS, oldRSs, err = dc.getAllReplicaSetsAndSyncRevision(d, rsList, podMap, true)
+		if err != nil {
+			return err
+		}
+		allRSs = append(oldRSs, newRS)
+	}
+
+	// scale up new replica set.
+	if _, err := dc.scaleUpNewReplicaSetForRecreate(newRS, d); err != nil {
+		return err
+	}
+
+	if util.DeploymentComplete(d, &d.Status) {
+		if err := dc.cleanupDeployment(oldRSs, d); err != nil {
+			return err
+		}
+	}
+
+	// Sync deployment status.
+	return dc.syncRolloutStatus(allRSs, newRS, d)
+}
+
+// scaleDownOldReplicaSetsForRecreate scales down old replica sets when deployment strategy is "Recreate".
+func (dc *DeploymentController) scaleDownOldReplicaSetsForRecreate(oldRSs []*extensions.ReplicaSet, deployment *extensions.Deployment) (bool, error) {
+	scaled := false
+	for i := range oldRSs {
+		rs := oldRSs[i]
+		// Scaling not required.
+		if *(rs.Spec.Replicas) == 0 {
+			continue
+		}
+		scaledRS, updatedRS, err := dc.scaleReplicaSetAndRecordEvent(rs, 0, deployment)
+		if err != nil {
+			return false, err
+		}
+		if scaledRS {
+			oldRSs[i] = updatedRS
+			scaled = true
+		}
+	}
+	return scaled, nil
+}
+
+// oldPodsRunning returns whether there are old pods running or any of the old ReplicaSets thinks that it runs pods.
+func oldPodsRunning(newRS *extensions.ReplicaSet, oldRSs []*extensions.ReplicaSet, podMap map[types.UID]*v1.PodList) bool {
+	if oldPods := util.GetActualReplicaCountForReplicaSets(oldRSs); oldPods > 0 {
+		return true
+	}
+	for rsUID, podList := range podMap {
+		// If the pods belong to the new ReplicaSet, ignore.
+		if newRS != nil && newRS.UID == rsUID {
+			continue
+		}
+		if len(podList.Items) > 0 {
+			return true
+		}
+	}
+	return false
+}
+
+// scaleUpNewReplicaSetForRecreate scales up new replica set when deployment strategy is "Recreate".
+func (dc *DeploymentController) scaleUpNewReplicaSetForRecreate(newRS *extensions.ReplicaSet, deployment *extensions.Deployment) (bool, error) {
+	scaled, _, err := dc.scaleReplicaSetAndRecordEvent(newRS, *(deployment.Spec.Replicas), deployment)
+	return scaled, err
+}