// manageJob is the core method responsible for managing the number of running
// pods according to what is specified in the job.Spec.
func (jm *JobController) manageJob(activePods []*api.Pod, succeeded int32, job *batch.Job) int32 {
var activeLock sync.Mutex
active := int32(len(activePods))
parallelism := *job.Spec.Parallelism
jobKey, err := controller.KeyFunc(job)
if err != nil {
glog.Errorf("Couldn't get key for job %#v: %v", job, err)
return 0
}
if active > parallelism {
diff := active - parallelism
jm.expectations.ExpectDeletions(jobKey, int(diff))
glog.V(4).Infof("Too many pods running job %q, need %d, deleting %d", jobKey, parallelism, diff)
// Sort the pods in the order such that not-ready < ready, unscheduled
// < scheduled, and pending < running. This ensures that we delete pods
// in the earlier stages whenever possible.
sort.Sort(controller.ActivePods(activePods))
active -= diff
wait := sync.WaitGroup{}
wait.Add(int(diff))
for i := int32(0); i < diff; i++ {
go func(ix int32) {
defer wait.Done()
if err := jm.podControl.DeletePod(job.Namespace, activePods[ix].Name, job); err != nil {
defer utilruntime.HandleError(err)
// Decrement the expected number of deletes because the informer won't observe this deletion
jm.expectations.DeletionObserved(jobKey)
activeLock.Lock()
active++
activeLock.Unlock()
}
}(i)
}
wait.Wait()
} else if active < parallelism {
wantActive := int32(0)
if job.Spec.Completions == nil {
// Job does not specify a number of completions. Therefore, number active
// should be equal to parallelism, unless the job has seen at least
// once success, in which leave whatever is running, running.
if succeeded > 0 {
wantActive = active
} else {
wantActive = parallelism
}
} else {
// Job specifies a specific number of completions. Therefore, number
// active should not ever exceed number of remaining completions.
wantActive = *job.Spec.Completions - succeeded
if wantActive > parallelism {
wantActive = parallelism
}
}
diff := wantActive - active
if diff < 0 {
glog.Errorf("More active than wanted: job %q, want %d, have %d", jobKey, wantActive, active)
diff = 0
}
jm.expectations.ExpectCreations(jobKey, int(diff))
glog.V(4).Infof("Too few pods running job %q, need %d, creating %d", jobKey, wantActive, diff)
active += diff
wait := sync.WaitGroup{}
wait.Add(int(diff))
for i := int32(0); i < diff; i++ {
go func() {
defer wait.Done()
if err := jm.podControl.CreatePods(job.Namespace, &job.Spec.Template, job); err != nil {
defer utilruntime.HandleError(err)
// Decrement the expected number of creates because the informer won't observe this pod
jm.expectations.CreationObserved(jobKey)
activeLock.Lock()
active--
activeLock.Unlock()
}
}()
}
wait.Wait()
}
return active
}
// manageReplicas checks and updates replicas for the given ReplicaSet.
func (rsc *ReplicaSetController) manageReplicas(filteredPods []*api.Pod, rs *extensions.ReplicaSet) {
diff := len(filteredPods) - int(rs.Spec.Replicas)
rsKey, err := controller.KeyFunc(rs)
if err != nil {
glog.Errorf("Couldn't get key for ReplicaSet %#v: %v", rs, err)
return
}
if diff < 0 {
diff *= -1
if diff > rsc.burstReplicas {
diff = rsc.burstReplicas
}
// TODO: Track UIDs of creates just like deletes. The problem currently
// is we'd need to wait on the result of a create to record the pod's
// UID, which would require locking *across* the create, which will turn
// into a performance bottleneck. We should generate a UID for the pod
// beforehand and store it via ExpectCreations.
rsc.expectations.ExpectCreations(rsKey, diff)
wait := sync.WaitGroup{}
wait.Add(diff)
glog.V(2).Infof("Too few %q/%q replicas, need %d, creating %d", rs.Namespace, rs.Name, rs.Spec.Replicas, diff)
for i := 0; i < diff; i++ {
go func() {
defer wait.Done()
if err := rsc.podControl.CreatePods(rs.Namespace, &rs.Spec.Template, rs); err != nil {
// Decrement the expected number of creates because the informer won't observe this pod
glog.V(2).Infof("Failed creation, decrementing expectations for replica set %q/%q", rs.Namespace, rs.Name)
rsc.expectations.CreationObserved(rsKey)
utilruntime.HandleError(err)
}
}()
}
wait.Wait()
} else if diff > 0 {
if diff > rsc.burstReplicas {
diff = rsc.burstReplicas
}
glog.V(2).Infof("Too many %q/%q replicas, need %d, deleting %d", rs.Namespace, rs.Name, rs.Spec.Replicas, diff)
// No need to sort pods if we are about to delete all of them
if rs.Spec.Replicas != 0 {
// Sort the pods in the order such that not-ready < ready, unscheduled
// < scheduled, and pending < running. This ensures that we delete pods
// in the earlier stages whenever possible.
sort.Sort(controller.ActivePods(filteredPods))
}
// Snapshot the UIDs (ns/name) of the pods we're expecting to see
// deleted, so we know to record their expectations exactly once either
// when we see it as an update of the deletion timestamp, or as a delete.
// Note that if the labels on a pod/rs change in a way that the pod gets
// orphaned, the rs will only wake up after the expectations have
// expired even if other pods are deleted.
deletedPodKeys := []string{}
for i := 0; i < diff; i++ {
deletedPodKeys = append(deletedPodKeys, controller.PodKey(filteredPods[i]))
}
rsc.expectations.ExpectDeletions(rsKey, deletedPodKeys)
wait := sync.WaitGroup{}
wait.Add(diff)
for i := 0; i < diff; i++ {
go func(ix int) {
defer wait.Done()
if err := rsc.podControl.DeletePod(rs.Namespace, filteredPods[ix].Name, rs); err != nil {
// Decrement the expected number of deletes because the informer won't observe this deletion
podKey := controller.PodKey(filteredPods[ix])
glog.V(2).Infof("Failed to delete %v, decrementing expectations for controller %q/%q", podKey, rs.Namespace, rs.Name)
rsc.expectations.DeletionObserved(rsKey, podKey)
utilruntime.HandleError(err)
}
}(i)
}
wait.Wait()
}
}