mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
synced 2025-10-31 10:18:13 +00:00
71 lines
2.9 KiB
Go
71 lines
2.9 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors 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.
|
|
*/
|
|
|
|
package replication
|
|
|
|
import (
|
|
"github.com/golang/glog"
|
|
"k8s.io/kubernetes/pkg/api"
|
|
client "k8s.io/kubernetes/pkg/client/unversioned"
|
|
)
|
|
|
|
// updateReplicaCount attempts to update the Status.Replicas of the given controller, with a single GET/PUT retry.
|
|
func updateReplicaCount(rcClient client.ReplicationControllerInterface, controller api.ReplicationController, numReplicas int) (updateErr error) {
|
|
// This is the steady state. It happens when the rc doesn't have any expectations, since
|
|
// we do a periodic relist every 30s. If the generations differ but the replicas are
|
|
// the same, a caller might've resized to the same replica count.
|
|
if controller.Status.Replicas == numReplicas &&
|
|
controller.Generation == controller.Status.ObservedGeneration {
|
|
return nil
|
|
}
|
|
// Save the generation number we acted on, otherwise we might wrongfully indicate
|
|
// that we've seen a spec update when we retry.
|
|
// TODO: This can clobber an update if we allow multiple agents to write to the
|
|
// same status.
|
|
generation := controller.Generation
|
|
|
|
var getErr error
|
|
for i, rc := 0, &controller; ; i++ {
|
|
glog.V(4).Infof("Updating replica count for rc: %v, %d->%d (need %d), sequence No: %v->%v",
|
|
controller.Name, controller.Status.Replicas, numReplicas, controller.Spec.Replicas, controller.Status.ObservedGeneration, generation)
|
|
|
|
rc.Status = api.ReplicationControllerStatus{Replicas: numReplicas, ObservedGeneration: generation}
|
|
_, updateErr = rcClient.UpdateStatus(rc)
|
|
if updateErr == nil || i >= statusUpdateRetries {
|
|
return updateErr
|
|
}
|
|
// Update the controller with the latest resource version for the next poll
|
|
if rc, getErr = rcClient.Get(controller.Name); getErr != nil {
|
|
// If the GET fails we can't trust status.Replicas anymore. This error
|
|
// is bound to be more interesting than the update failure.
|
|
return getErr
|
|
}
|
|
}
|
|
}
|
|
|
|
// OverlappingControllers sorts a list of controllers by creation timestamp, using their names as a tie breaker.
|
|
type overlappingControllers []api.ReplicationController
|
|
|
|
func (o overlappingControllers) Len() int { return len(o) }
|
|
func (o overlappingControllers) Swap(i, j int) { o[i], o[j] = o[j], o[i] }
|
|
|
|
func (o overlappingControllers) Less(i, j int) bool {
|
|
if o[i].CreationTimestamp.Equal(o[j].CreationTimestamp) {
|
|
return o[i].Name < o[j].Name
|
|
}
|
|
return o[i].CreationTimestamp.Before(o[j].CreationTimestamp)
|
|
}
|