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88 lines
3.9 KiB
Go
88 lines
3.9 KiB
Go
/*
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Copyright 2015 The Kubernetes 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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// If you make changes to this file, you should also make the corresponding change in ReplicaSet.
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package replication
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import (
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"fmt"
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"github.com/golang/glog"
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"k8s.io/kubernetes/pkg/api"
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unversionedcore "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/unversioned"
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)
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// updateReplicaCount attempts to update the Status.Replicas of the given controller, with a single GET/PUT retry.
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func updateReplicaCount(rcClient unversionedcore.ReplicationControllerInterface, controller api.ReplicationController, numReplicas, numFullyLabeledReplicas, numReadyReplicas, numAvailableReplicas int) (updateErr error) {
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// This is the steady state. It happens when the rc doesn't have any expectations, since
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// we do a periodic relist every 30s. If the generations differ but the replicas are
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// the same, a caller might've resized to the same replica count.
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if int(controller.Status.Replicas) == numReplicas &&
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int(controller.Status.FullyLabeledReplicas) == numFullyLabeledReplicas &&
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int(controller.Status.ReadyReplicas) == numReadyReplicas &&
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int(controller.Status.AvailableReplicas) == numAvailableReplicas &&
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controller.Generation == controller.Status.ObservedGeneration {
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return nil
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}
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// Save the generation number we acted on, otherwise we might wrongfully indicate
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// that we've seen a spec update when we retry.
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// TODO: This can clobber an update if we allow multiple agents to write to the
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// same status.
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generation := controller.Generation
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var getErr error
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for i, rc := 0, &controller; ; i++ {
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glog.V(4).Infof(fmt.Sprintf("Updating replica count for rc: %s/%s, ", controller.Namespace, controller.Name) +
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fmt.Sprintf("replicas %d->%d (need %d), ", controller.Status.Replicas, numReplicas, controller.Spec.Replicas) +
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fmt.Sprintf("fullyLabeledReplicas %d->%d, ", controller.Status.FullyLabeledReplicas, numFullyLabeledReplicas) +
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fmt.Sprintf("readyReplicas %d->%d, ", controller.Status.ReadyReplicas, numReadyReplicas) +
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fmt.Sprintf("availableReplicas %d->%d, ", controller.Status.AvailableReplicas, numAvailableReplicas) +
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fmt.Sprintf("sequence No: %v->%v", controller.Status.ObservedGeneration, generation))
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rc.Status = api.ReplicationControllerStatus{
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Replicas: int32(numReplicas),
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FullyLabeledReplicas: int32(numFullyLabeledReplicas),
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ReadyReplicas: int32(numReadyReplicas),
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AvailableReplicas: int32(numAvailableReplicas),
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ObservedGeneration: generation,
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}
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_, updateErr = rcClient.UpdateStatus(rc)
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if updateErr == nil || i >= statusUpdateRetries {
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return updateErr
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}
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// Update the controller with the latest resource version for the next poll
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if rc, getErr = rcClient.Get(controller.Name); getErr != nil {
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// If the GET fails we can't trust status.Replicas anymore. This error
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// is bound to be more interesting than the update failure.
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return getErr
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}
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}
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}
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// OverlappingControllers sorts a list of controllers by creation timestamp, using their names as a tie breaker.
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type OverlappingControllers []*api.ReplicationController
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func (o OverlappingControllers) Len() int { return len(o) }
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func (o OverlappingControllers) Swap(i, j int) { o[i], o[j] = o[j], o[i] }
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func (o OverlappingControllers) Less(i, j int) bool {
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if o[i].CreationTimestamp.Equal(o[j].CreationTimestamp) {
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return o[i].Name < o[j].Name
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}
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return o[i].CreationTimestamp.Before(o[j].CreationTimestamp)
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}
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