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controller.go
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controller.go
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/*
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 controller
import (
"time"
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
log "github.com/golang/glog"
"k8s.io/kubernetes/contrib/mesos/pkg/runtime"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/algorithm"
"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/binder"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/record"
)
const (
recoveryDelay = 100 * time.Millisecond // delay after scheduler plugin crashes, before we resume scheduling
FailedScheduling = "FailedScheduling"
Scheduled = "Scheduled"
)
type Controller interface {
Run(<-chan struct{})
}
type controller struct {
algorithm algorithm.SchedulerAlgorithm
binder binder.Binder
nextPod func() *api.Pod
error func(*api.Pod, error)
recorder record.EventRecorder
client *clientset.Clientset
started chan<- struct{} // startup latch
}
func New(client *clientset.Clientset, algorithm algorithm.SchedulerAlgorithm,
recorder record.EventRecorder, nextPod func() *api.Pod, error func(pod *api.Pod, schedulingErr error),
binder binder.Binder, started chan<- struct{}) Controller {
return &controller{
algorithm: algorithm,
binder: binder,
nextPod: nextPod,
error: error,
recorder: recorder,
client: client,
started: started,
}
}
func (s *controller) Run(done <-chan struct{}) {
defer close(s.started)
go runtime.Until(s.scheduleOne, recoveryDelay, done)
}
// hacked from GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/scheduler.go,
// with the Modeler stuff removed since we don't use it because we have mesos.
func (s *controller) scheduleOne() {
pod := s.nextPod()
// pods which are pre-scheduled (i.e. NodeName is set) are deleted by the kubelet
// in upstream. Not so in Mesos because the kubelet hasn't see that pod yet. Hence,
// the scheduler has to take care of this:
if pod.Spec.NodeName != "" && pod.DeletionTimestamp != nil {
log.V(3).Infof("deleting pre-scheduled, not yet running pod: %s/%s", pod.Namespace, pod.Name)
s.client.Core().Pods(pod.Namespace).Delete(pod.Name, api.NewDeleteOptions(0))
return
}
log.V(3).Infof("Attempting to schedule: %+v", pod)
dest, err := s.algorithm.Schedule(pod)
if err != nil {
log.V(1).Infof("Failed to schedule: %+v", pod)
s.recorder.Eventf(pod, api.EventTypeWarning, FailedScheduling, "Error scheduling: %v", err)
s.error(pod, err)
return
}
b := &api.Binding{
ObjectMeta: api.ObjectMeta{Namespace: pod.Namespace, Name: pod.Name},
Target: api.ObjectReference{
Kind: "Node",
Name: dest,
},
}
if err := s.binder.Bind(b); err != nil {
log.V(1).Infof("Failed to bind pod: %+v", err)
s.recorder.Eventf(pod, api.EventTypeWarning, FailedScheduling, "Binding rejected: %v", err)
s.error(pod, err)
return
}
s.recorder.Eventf(pod, api.EventTypeNormal, Scheduled, "Successfully assigned %v to %v", pod.Name, dest)
}