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https://github.com/optim-enterprises-bv/kubernetes.git
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108 lines
3.4 KiB
Go
108 lines
3.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 controller
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import (
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"time"
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log "github.com/golang/glog"
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"k8s.io/kubernetes/contrib/mesos/pkg/runtime"
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"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/algorithm"
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"k8s.io/kubernetes/contrib/mesos/pkg/scheduler/components/binder"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/client/record"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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)
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const (
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recoveryDelay = 100 * time.Millisecond // delay after scheduler plugin crashes, before we resume scheduling
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FailedScheduling = "FailedScheduling"
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Scheduled = "Scheduled"
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)
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type Controller interface {
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Run(<-chan struct{})
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}
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type controller struct {
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algorithm algorithm.SchedulerAlgorithm
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binder binder.Binder
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nextPod func() *api.Pod
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error func(*api.Pod, error)
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recorder record.EventRecorder
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client *client.Client
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started chan<- struct{} // startup latch
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}
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func New(client *client.Client, algorithm algorithm.SchedulerAlgorithm,
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recorder record.EventRecorder, nextPod func() *api.Pod, error func(pod *api.Pod, schedulingErr error),
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binder binder.Binder, started chan<- struct{}) Controller {
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return &controller{
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algorithm: algorithm,
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binder: binder,
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nextPod: nextPod,
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error: error,
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recorder: recorder,
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client: client,
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started: started,
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}
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}
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func (s *controller) Run(done <-chan struct{}) {
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defer close(s.started)
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go runtime.Until(s.scheduleOne, recoveryDelay, done)
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}
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// hacked from GoogleCloudPlatform/kubernetes/plugin/pkg/scheduler/scheduler.go,
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// with the Modeler stuff removed since we don't use it because we have mesos.
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func (s *controller) scheduleOne() {
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pod := s.nextPod()
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// pods which are pre-scheduled (i.e. NodeName is set) are deleted by the kubelet
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// in upstream. Not so in Mesos because the kubelet hasn't see that pod yet. Hence,
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// the scheduler has to take care of this:
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if pod.Spec.NodeName != "" && pod.DeletionTimestamp != nil {
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log.V(3).Infof("deleting pre-scheduled, not yet running pod: %s/%s", pod.Namespace, pod.Name)
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s.client.Pods(pod.Namespace).Delete(pod.Name, api.NewDeleteOptions(0))
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return
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}
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log.V(3).Infof("Attempting to schedule: %+v", pod)
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dest, err := s.algorithm.Schedule(pod)
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if err != nil {
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log.V(1).Infof("Failed to schedule: %+v", pod)
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s.recorder.Eventf(pod, api.EventTypeWarning, FailedScheduling, "Error scheduling: %v", err)
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s.error(pod, err)
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return
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}
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b := &api.Binding{
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ObjectMeta: api.ObjectMeta{Namespace: pod.Namespace, Name: pod.Name},
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Target: api.ObjectReference{
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Kind: "Node",
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Name: dest,
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},
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}
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if err := s.binder.Bind(b); err != nil {
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log.V(1).Infof("Failed to bind pod: %+v", err)
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s.recorder.Eventf(pod, api.EventTypeWarning, FailedScheduling, "Binding rejected: %v", err)
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s.error(pod, err)
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return
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}
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s.recorder.Eventf(pod, api.EventTypeNormal, Scheduled, "Successfully assigned %v to %v", pod.Name, dest)
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}
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