kubernetes源码-StatefulSet Controller 原理和源码分析

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func NewStatefulSetController(
  podInformer coreinformers.PodInformer,
  setInformer appsinformers.StatefulSetInformer,
  pvcInformer coreinformers.PersistentVolumeClaimInformer,
  revInformer appsinformers.ControllerRevisionInformer,
  kubeClient clientset.Interface,
) *StatefulSetController {
  eventBroadcaster := record.NewBroadcaster()
  eventBroadcaster.StartStructuredLogging(0)
  eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
  recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "statefulset-controller"})
  ssc := &StatefulSetController{
    kubeClient: kubeClient,
    control: NewDefaultStatefulSetControl(
      NewRealStatefulPodControl(
        kubeClient,
        setInformer.Lister(),
        podInformer.Lister(),
        pvcInformer.Lister(),
        recorder),
      NewRealStatefulSetStatusUpdater(kubeClient, setInformer.Lister()),
      history.NewHistory(kubeClient, revInformer.Lister()),
      recorder,
    ),
    pvcListerSynced: pvcInformer.Informer().HasSynced,
    queue:           workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "statefulset"),
    podControl:      controller.RealPodControl{KubeClient: kubeClient, Recorder: recorder},

    revListerSynced: revInformer.Informer().HasSynced,
  }

  podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
    // lookup the statefulset and enqueue
    AddFunc: ssc.addPod,
    // lookup current and old statefulset if labels changed
    UpdateFunc: ssc.updatePod,
    // lookup statefulset accounting for deletion tombstones
    DeleteFunc: ssc.deletePod,
  })
  ssc.podLister = podInformer.Lister()
  ssc.podListerSynced = podInformer.Informer().HasSynced

  setInformer.Informer().AddEventHandler(
    cache.ResourceEventHandlerFuncs{
      AddFunc: ssc.enqueueStatefulSet,
      UpdateFunc: func(old, cur interface{}) {
        oldPS := old.(*apps.StatefulSet)
        curPS := cur.(*apps.StatefulSet)
        if oldPS.Status.Replicas != curPS.Status.Replicas {
          klog.V(4).Infof("Observed updated replica count for StatefulSet: %v, %d->%d", curPS.Name, oldPS.Status.Replicas, curPS.Status.Replicas)
        }
        ssc.enqueueStatefulSet(cur)
      },
      DeleteFunc: ssc.enqueueStatefulSet,
    },
  )
  ssc.setLister = setInformer.Lister()
  ssc.setListerSynced = setInformer.Informer().HasSynced

  // TODO: Watch volumes
  return ssc
}

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// enqueueStatefulSet enqueues the given statefulset in the work queue.
func (ssc *StatefulSetController) enqueueStatefulSet(obj interface{}) {
  key, err := controller.KeyFunc(obj)
  if err != nil {
    utilruntime.HandleError(fmt.Errorf("couldn't get key for object %+v: %v", obj, err))
    return
  }
  ssc.queue.Add(key)
}

// enqueueStatefulSet enqueues the given statefulset in the work queue after given time
func (ssc *StatefulSetController) enqueueSSAfter(ss *apps.StatefulSet, duration time.Duration) {
  key, err := controller.KeyFunc(ss)
  if err != nil {
    utilruntime.HandleError(fmt.Errorf("couldn't get key for object %#v: %v", ss, err))
    return
  }
  ssc.queue.AddAfter(key, duration)
}

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// Run runs the statefulset controller.
func (ssc *StatefulSetController) Run(workers int, stopCh <-chan struct{}) {
  defer utilruntime.HandleCrash()
  defer ssc.queue.ShutDown()

  klog.Infof("Starting stateful set controller")
  defer klog.Infof("Shutting down statefulset controller")

  if !cache.WaitForNamedCacheSync("stateful set", stopCh, ssc.podListerSynced, ssc.setListerSynced, ssc.pvcListerSynced, ssc.revListerSynced) {
    return
  }

  for i := 0; i < workers; i++ {
    go wait.Until(ssc.worker, time.Second, stopCh)
  }

  <-stopCh
}

func (ssc *StatefulSetController) processNextWorkItem() bool {
  key, quit := ssc.queue.Get()
  if quit {
    return false
  }
  defer ssc.queue.Done(key)
  if err := ssc.sync(key.(string)); err != nil {
    utilruntime.HandleError(fmt.Errorf("error syncing StatefulSet %v, requeuing: %v", key.(string), err))
    ssc.queue.AddRateLimited(key)
  } else {
    ssc.queue.Forget(key)
  }
  return true
}

// worker runs a worker goroutine that invokes processNextWorkItem until the controller's queue is closed
func (ssc *StatefulSetController) worker() {
  for ssc.processNextWorkItem() {
  }
}

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func (ssc *StatefulSetController) sync(key string) error {
  startTime := time.Now()
  defer func() {
    klog.V(4).Infof("Finished syncing statefulset %q (%v)", key, time.Since(startTime))
  }()

  namespace, name, err := cache.SplitMetaNamespaceKey(key)
  if err != nil {
    return err
  }
  set, err := ssc.setLister.StatefulSets(namespace).Get(name)
  if errors.IsNotFound(err) {
    klog.Infof("StatefulSet has been deleted %v", key)
    return nil
  }
  if err != nil {
    utilruntime.HandleError(fmt.Errorf("unable to retrieve StatefulSet %v from store: %v", key, err))
    return err
  }

  selector, err := metav1.LabelSelectorAsSelector(set.Spec.Selector)
  if err != nil {
    utilruntime.HandleError(fmt.Errorf("error converting StatefulSet %v selector: %v", key, err))
    // This is a non-transient error, so don't retry.
    return nil
  }

  if err := ssc.adoptOrphanRevisions(set); err != nil {
    return err
  }

  pods, err := ssc.getPodsForStatefulSet(set, selector)
  if err != nil {
    return err
  }

  return ssc.syncStatefulSet(set, pods)
}

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func (ssc *StatefulSetController) syncStatefulSet(set *apps.StatefulSet, pods []*v1.Pod) error {
  klog.V(4).Infof("Syncing StatefulSet %v/%v with %d pods", set.Namespace, set.Name, len(pods))
  var status *apps.StatefulSetStatus
  var err error
  // TODO: investigate where we mutate the set during the update as it is not obvious.
  status, err = ssc.control.UpdateStatefulSet(set.DeepCopy(), pods)
  if err != nil {
    return err
  }
  klog.V(4).Infof("Successfully synced StatefulSet %s/%s successful", set.Namespace, set.Name)
  // One more sync to handle the clock skew. This is also helping in requeuing right after status update
  if utilfeature.DefaultFeatureGate.Enabled(features.StatefulSetMinReadySeconds) && set.Spec.MinReadySeconds > 0 && status != nil && status.AvailableReplicas != *set.Spec.Replicas {
    ssc.enqueueSSAfter(set, time.Duration(set.Spec.MinReadySeconds)*time.Second)
  }

  return nil
}

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func (ssc *defaultStatefulSetControl) UpdateStatefulSet(set *apps.StatefulSet, pods []*v1.Pod) (*apps.StatefulSetStatus, error) {
  // 获取所有 revisions 版本实例
  revisions, err := ssc.ListRevisions(set)
  if err != nil {
    return nil, err
  }
  // 排序
  history.SortControllerRevisions(revisions)
  // 获取 currentRevision, updateRevision ，用于清理 revision 个数。
  currentRevision, updateRevision, status, err := ssc.performUpdate(set, pods, revisions)
  if err != nil {
    return nil, utilerrors.NewAggregate([]error{err, ssc.truncateHistory(set, pods, revisions, currentRevision, updateRevision)})
  }

  // 清理历史版本个数
  return status, ssc.truncateHistory(set, pods, revisions, currentRevision, updateRevision)
}

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func (ssc *defaultStatefulSetControl) performUpdate(
  set *apps.StatefulSet, pods []*v1.Pod, revisions []*apps.ControllerRevision) (*apps.ControllerRevision, *apps.ControllerRevision, *apps.StatefulSetStatus, error) {
  var currentStatus *apps.StatefulSetStatus
  // 根据 hash 获取 currentRevision, updateRevision ，用于判断是否更新 sts 实例对象。
  currentRevision, updateRevision, collisionCount, err := ssc.getStatefulSetRevisions(set, revisions)
  if err != nil {
    return currentRevision, updateRevision, currentStatus, err
  }

  // 执行 sts 实例扩缩容，滚动更新
  currentStatus, err = ssc.updateStatefulSet(set, currentRevision, updateRevision, collisionCount, pods)
  if err != nil {
    return currentRevision, updateRevision, currentStatus, err
  }
  // 设置 sts 实例对象 status 数值
  err = ssc.updateStatefulSetStatus(set, currentStatus)
  if err != nil {
    return currentRevision, updateRevision, currentStatus, err
  }
  klog.V(4).Infof("StatefulSet %s/%s pod status replicas=%d ready=%d current=%d updated=%d",
    set.Namespace,
    set.Name,
    currentStatus.Replicas,
    currentStatus.ReadyReplicas,
    currentStatus.CurrentReplicas,
    currentStatus.UpdatedReplicas)

  klog.V(4).Infof("StatefulSet %s/%s revisions current=%s update=%s",
    set.Namespace,
    set.Name,
    currentStatus.CurrentRevision,
    currentStatus.UpdateRevision)

  return currentRevision, updateRevision, currentStatus, nil
}

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func (ssc *defaultStatefulSetControl) getStatefulSetRevisions(
  set *apps.StatefulSet,
  revisions []*apps.ControllerRevision) (*apps.ControllerRevision, *apps.ControllerRevision, int32, error) {
  var currentRevision, updateRevision *apps.ControllerRevision

  revisionCount := len(revisions)
  history.SortControllerRevisions(revisions)

  // Use a local copy of set.Status.CollisionCount to avoid modifying set.Status directly.
  // This copy is returned so the value gets carried over to set.Status in updateStatefulSet.
  var collisionCount int32
  if set.Status.CollisionCount != nil {
    collisionCount = *set.Status.CollisionCount
  }

  // create a new revision from the current set
  updateRevision, err := newRevision(set, nextRevision(revisions), &collisionCount)
  if err != nil {
    return nil, nil, collisionCount, err
  }

  // find any equivalent revisions
  equalRevisions := history.FindEqualRevisions(revisions, updateRevision)
  equalCount := len(equalRevisions)

  if equalCount > 0 && history.EqualRevision(revisions[revisionCount-1], equalRevisions[equalCount-1]) {
    // 如果 revisions 的最新版本 跟 equalRevisions 里面的最新版本 hash 一致 则无需更新和同步
    updateRevision = revisions[revisionCount-1]
  } else if equalCount > 0 {
    // 如果 hash 有一致的，但不是最新的版本，则认为需要更新 revision 为当前的 equalRevisions[equalCount-1]
    updateRevision, err = ssc.controllerHistory.UpdateControllerRevision(
      equalRevisions[equalCount-1],
      updateRevision.Revision)
    if err != nil {
      return nil, nil, collisionCount, err
    }
  } else {
    // 如果不存在则创建
    updateRevision, err = ssc.controllerHistory.CreateControllerRevision(set, updateRevision, &collisionCount)
    if err != nil {
      return nil, nil, collisionCount, err
    }
  }

  // attempt to find the revision that corresponds to the current revision
  for i := range revisions {
    if revisions[i].Name == set.Status.CurrentRevision {
      currentRevision = revisions[i]
      break
    }
  }

  // if the current revision is nil we initialize the history by setting it to the update revision
  if currentRevision == nil {
    currentRevision = updateRevision
  }

  return currentRevision, updateRevision, collisionCount, nil
}

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func (ssc *defaultStatefulSetControl) updateStatefulSet(
  set *apps.StatefulSet,
  currentRevision *apps.ControllerRevision,
  updateRevision *apps.ControllerRevision,
  collisionCount int32,
  pods []*v1.Pod) (*apps.StatefulSetStatus, error) {
  // get the current and update revisions of the set.
  currentSet, err := ApplyRevision(set, currentRevision)
  if err != nil {
    return nil, err
  }
  updateSet, err := ApplyRevision(set, updateRevision)
  if err != nil {
    return nil, err
  }

  // set the generation, and revisions in the returned status
  status := apps.StatefulSetStatus{}
  status.ObservedGeneration = set.Generation
  status.CurrentRevision = currentRevision.Name
  status.UpdateRevision = updateRevision.Name
  status.CollisionCount = new(int32)
  *status.CollisionCount = collisionCount

  replicaCount := int(*set.Spec.Replicas)
  // slice that will contain all Pods such that 0 <= getOrdinal(pod) < set.Spec.Replicas
  replicas := make([]*v1.Pod, replicaCount)
  // slice that will contain all Pods such that set.Spec.Replicas <= getOrdinal(pod)
  condemned := make([]*v1.Pod, 0, len(pods))
  unhealthy := 0
  var firstUnhealthyPod *v1.Pod

  // 过滤 pod 到2个切片
  for i := range pods {
    status.Replicas++

    // count the number of running and ready replicas
    if isRunningAndReady(pods[i]) {
      status.ReadyReplicas++
      // count the number of running and available replicas
      if utilfeature.DefaultFeatureGate.Enabled(features.StatefulSetMinReadySeconds) {
        if isRunningAndAvailable(pods[i], set.Spec.MinReadySeconds) {
          status.AvailableReplicas++
        }
      } else {
        // If the featuregate is not enabled, all the ready replicas should be considered as available replicas
        status.AvailableReplicas = status.ReadyReplicas
      }
    }

    // pod 存不存在
    if isCreated(pods[i]) && !isTerminating(pods[i]) {
      if getPodRevision(pods[i]) == currentRevision.Name {
        status.CurrentReplicas++
      }
      if getPodRevision(pods[i]) == updateRevision.Name {
        status.UpdatedReplicas++
      }
    }

    if ord := getOrdinal(pods[i]); 0 <= ord && ord < replicaCount {
      // 少了的 pod 加入待创建的切片
      replicas[ord] = pods[i]

    } else if ord >= replicaCount {
      // 超过数量的 pod 加入待删除切片
      condemned = append(condemned, pods[i])
    }
    // If the ordinal could not be parsed (ord < 0), ignore the Pod.
  }

  // 判断是否需要创建 pod
  for ord := 0; ord < replicaCount; ord++ {
    if replicas[ord] == nil {
      replicas[ord] = newVersionedStatefulSetPod(
        currentSet,
        updateSet,
        currentRevision.Name,
        updateRevision.Name, ord)
    }
  }

  // sort the condemned Pods by their ordinals
  sort.Sort(ascendingOrdinal(condemned))

  // find the first unhealthy Pod
  for i := range replicas {
    if !isHealthy(replicas[i]) {
      unhealthy++
      if firstUnhealthyPod == nil {
        firstUnhealthyPod = replicas[i]
      }
    }
  }

  for i := range condemned {
    if !isHealthy(condemned[i]) {
      unhealthy++
      if firstUnhealthyPod == nil {
        firstUnhealthyPod = condemned[i]
      }
    }
  }

  if unhealthy > 0 {
    klog.V(4).Infof("StatefulSet %s/%s has %d unhealthy Pods starting with %s",
      set.Namespace,
      set.Name,
      unhealthy,
      firstUnhealthyPod.Name)
  }

  // If the StatefulSet is being deleted, don't do anything other than updating
  // status.
  if set.DeletionTimestamp != nil {
    return &status, nil
  }

  monotonic := !allowsBurst(set)

  // Examine each replica with respect to its ordinal
  for i := range replicas {
    // 重建不健康的 pod
    if isFailed(replicas[i]) {
      ssc.recorder.Eventf(set, v1.EventTypeWarning, "RecreatingFailedPod",
        "StatefulSet %s/%s is recreating failed Pod %s",
        set.Namespace,
        set.Name,
        replicas[i].Name)
      if err := ssc.podControl.DeleteStatefulPod(set, replicas[i]); err != nil {
        return &status, err
      }
      if getPodRevision(replicas[i]) == currentRevision.Name {
        status.CurrentReplicas--
      }
      if getPodRevision(replicas[i]) == updateRevision.Name {
        status.UpdatedReplicas--
      }
      status.Replicas--
      replicas[i] = newVersionedStatefulSetPod(
        currentSet,
        updateSet,
        currentRevision.Name,
        updateRevision.Name,
        i)
    }
    // 扩容
    if !isCreated(replicas[i]) {
      if err := ssc.podControl.CreateStatefulPod(set, replicas[i]); err != nil {
        return &status, err
      }
      status.Replicas++
      if getPodRevision(replicas[i]) == currentRevision.Name {
        status.CurrentReplicas++
      }
      if getPodRevision(replicas[i]) == updateRevision.Name {
        status.UpdatedReplicas++
      }

      // if the set does not allow bursting, return immediately
      if monotonic {
        return &status, nil
      }
      // pod created, no more work possible for this round
      continue
    }
    // If we find a Pod that is currently terminating, we must wait until graceful deletion
    // completes before we continue to make progress.
    if isTerminating(replicas[i]) && monotonic {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to Terminate",
        set.Namespace,
        set.Name,
        replicas[i].Name)
      return &status, nil
    }
    // If we have a Pod that has been created but is not running and ready we can not make progress.
    // We must ensure that all for each Pod, when we create it, all of its predecessors, with respect to its
    // ordinal, are Running and Ready.
    if !isRunningAndReady(replicas[i]) && monotonic {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to be Running and Ready",
        set.Namespace,
        set.Name,
        replicas[i].Name)
      return &status, nil
    }
    // If we have a Pod that has been created but is not available we can not make progress.
    // We must ensure that all for each Pod, when we create it, all of its predecessors, with respect to its
    // ordinal, are Available.
    // TODO: Since available is superset of Ready, once we have this featuregate enabled by default, we can remove the
    // isRunningAndReady block as only Available pods should be brought down.
    if utilfeature.DefaultFeatureGate.Enabled(features.StatefulSetMinReadySeconds) && !isRunningAndAvailable(replicas[i], set.Spec.MinReadySeconds) && monotonic {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to be Available",
        set.Namespace,
        set.Name,
        replicas[i].Name)
      return &status, nil
    }
    // Enforce the StatefulSet invariants
    if identityMatches(set, replicas[i]) && storageMatches(set, replicas[i]) {
      continue
    }
    // Make a deep copy so we don't mutate the shared cache
    replica := replicas[i].DeepCopy()
    if err := ssc.podControl.UpdateStatefulPod(updateSet, replica); err != nil {
      return &status, err
    }
  }

  // 缩容
  for target := len(condemned) - 1; target >= 0; target-- {
    // wait for terminating pods to expire
    if isTerminating(condemned[target]) {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to Terminate prior to scale down",
        set.Namespace,
        set.Name,
        condemned[target].Name)
      // block if we are in monotonic mode
      if monotonic {
        return &status, nil
      }
      continue
    }
    // if we are in monotonic mode and the condemned target is not the first unhealthy Pod block
    if !isRunningAndReady(condemned[target]) && monotonic && condemned[target] != firstUnhealthyPod {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to be Running and Ready prior to scale down",
        set.Namespace,
        set.Name,
        firstUnhealthyPod.Name)
      return &status, nil
    }
    // if we are in monotonic mode and the condemned target is not the first unhealthy Pod, block.
    // TODO: Since available is superset of Ready, once we have this featuregate enabled by default, we can remove the
    // isRunningAndReady block as only Available pods should be brought down.
    if utilfeature.DefaultFeatureGate.Enabled(features.StatefulSetMinReadySeconds) && !isRunningAndAvailable(condemned[target], set.Spec.MinReadySeconds) && monotonic && condemned[target] != firstUnhealthyPod {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to be Available prior to scale down",
        set.Namespace,
        set.Name,
        firstUnhealthyPod.Name)
      return &status, nil
    }
    klog.V(2).Infof("StatefulSet %s/%s terminating Pod %s for scale down",
      set.Namespace,
      set.Name,
      condemned[target].Name)

    if err := ssc.podControl.DeleteStatefulPod(set, condemned[target]); err != nil {
      return &status, err
    }
    if getPodRevision(condemned[target]) == currentRevision.Name {
      status.CurrentReplicas--
    }
    if getPodRevision(condemned[target]) == updateRevision.Name {
      status.UpdatedReplicas--
    }
    if monotonic {
      return &status, nil
    }
  }

  // for the OnDelete strategy we short circuit. Pods will be updated when they are manually deleted.
  if set.Spec.UpdateStrategy.Type == apps.OnDeleteStatefulSetStrategyType {
    return &status, nil
  }

  // 滚动更新
  updateMin := 0
  if set.Spec.UpdateStrategy.RollingUpdate != nil {
    updateMin = int(*set.Spec.UpdateStrategy.RollingUpdate.Partition)
  }
  // we terminate the Pod with the largest ordinal that does not match the update revision.
  for target := len(replicas) - 1; target >= updateMin; target-- {

    // delete the Pod if it is not already terminating and does not match the update revision.
    if getPodRevision(replicas[target]) != updateRevision.Name && !isTerminating(replicas[target]) {
      klog.V(2).Infof("StatefulSet %s/%s terminating Pod %s for update",
        set.Namespace,
        set.Name,
        replicas[target].Name)
      err := ssc.podControl.DeleteStatefulPod(set, replicas[target])
      status.CurrentReplicas--
      return &status, err
    }

    // wait for unhealthy Pods on update
    if !isHealthy(replicas[target]) {
      klog.V(4).Infof(
        "StatefulSet %s/%s is waiting for Pod %s to update",
        set.Namespace,
        set.Name,
        replicas[target].Name)
      return &status, nil
    }

  }
  return &status, nil
}

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func (ssc *defaultStatefulSetControl) updateStatefulSetStatus(
  set *apps.StatefulSet,
  status *apps.StatefulSetStatus) error {
  // complete any in progress rolling update if necessary
  completeRollingUpdate(set, status)

  // if the status is not inconsistent do not perform an update
  if !inconsistentStatus(set, status) {
    return nil
  }

  // copy set and update its status
  set = set.DeepCopy()
  if err := ssc.statusUpdater.UpdateStatefulSetStatus(set, status); err != nil {
    return err
  }

  return nil
}