312 lines
13 KiB
Go
312 lines
13 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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 cronjob
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/*
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I did not use watch or expectations. Those add a lot of corner cases, and we aren't
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expecting a large volume of jobs or scheduledJobs. (We are favoring correctness
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over scalability. If we find a single controller thread is too slow because
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there are a lot of Jobs or CronJobs, we we can parallelize by Namespace.
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If we find the load on the API server is too high, we can use a watch and
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UndeltaStore.)
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Just periodically list jobs and SJs, and then reconcile them.
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*/
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import (
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"fmt"
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"time"
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"github.com/golang/glog"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/types"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/api/v1"
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batch "k8s.io/kubernetes/pkg/apis/batch/v2alpha1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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v1core "k8s.io/kubernetes/pkg/client/clientset_generated/clientset/typed/core/v1"
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"k8s.io/kubernetes/pkg/client/record"
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"k8s.io/kubernetes/pkg/util/metrics"
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)
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// Utilities for dealing with Jobs and CronJobs and time.
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type CronJobController struct {
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kubeClient clientset.Interface
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jobControl jobControlInterface
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sjControl sjControlInterface
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podControl podControlInterface
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recorder record.EventRecorder
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}
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func NewCronJobController(kubeClient clientset.Interface) *CronJobController {
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eventBroadcaster := record.NewBroadcaster()
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eventBroadcaster.StartLogging(glog.Infof)
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// TODO: remove the wrapper when every clients have moved to use the clientset.
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eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: kubeClient.Core().Events("")})
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if kubeClient != nil && kubeClient.Core().RESTClient().GetRateLimiter() != nil {
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metrics.RegisterMetricAndTrackRateLimiterUsage("cronjob_controller", kubeClient.Core().RESTClient().GetRateLimiter())
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}
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jm := &CronJobController{
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kubeClient: kubeClient,
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jobControl: realJobControl{KubeClient: kubeClient},
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sjControl: &realSJControl{KubeClient: kubeClient},
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podControl: &realPodControl{KubeClient: kubeClient},
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recorder: eventBroadcaster.NewRecorder(v1.EventSource{Component: "cronjob-controller"}),
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}
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return jm
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}
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func NewCronJobControllerFromClient(kubeClient clientset.Interface) *CronJobController {
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jm := NewCronJobController(kubeClient)
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return jm
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}
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// Run the main goroutine responsible for watching and syncing jobs.
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func (jm *CronJobController) Run(stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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glog.Infof("Starting CronJob Manager")
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// Check things every 10 second.
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go wait.Until(jm.SyncAll, 10*time.Second, stopCh)
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<-stopCh
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glog.Infof("Shutting down CronJob Manager")
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}
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// SyncAll lists all the CronJobs and Jobs and reconciles them.
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func (jm *CronJobController) SyncAll() {
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sjl, err := jm.kubeClient.BatchV2alpha1().CronJobs(metav1.NamespaceAll).List(metav1.ListOptions{})
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if err != nil {
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glog.Errorf("Error listing cronjobs: %v", err)
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return
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}
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sjs := sjl.Items
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glog.V(4).Infof("Found %d cronjobs", len(sjs))
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jl, err := jm.kubeClient.BatchV2alpha1().Jobs(metav1.NamespaceAll).List(metav1.ListOptions{})
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if err != nil {
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glog.Errorf("Error listing jobs")
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return
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}
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js := jl.Items
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glog.V(4).Infof("Found %d jobs", len(js))
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jobsBySj := groupJobsByParent(sjs, js)
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glog.V(4).Infof("Found %d groups", len(jobsBySj))
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for _, sj := range sjs {
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SyncOne(sj, jobsBySj[sj.UID], time.Now(), jm.jobControl, jm.sjControl, jm.podControl, jm.recorder)
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}
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}
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// SyncOne reconciles a CronJob with a list of any Jobs that it created.
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// All known jobs created by "sj" should be included in "js".
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// The current time is passed in to facilitate testing.
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// It has no receiver, to facilitate testing.
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func SyncOne(sj batch.CronJob, js []batch.Job, now time.Time, jc jobControlInterface, sjc sjControlInterface, pc podControlInterface, recorder record.EventRecorder) {
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nameForLog := fmt.Sprintf("%s/%s", sj.Namespace, sj.Name)
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childrenJobs := make(map[types.UID]bool)
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for i := range js {
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j := js[i]
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childrenJobs[j.ObjectMeta.UID] = true
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found := inActiveList(sj, j.ObjectMeta.UID)
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if !found && !IsJobFinished(&j) {
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recorder.Eventf(&sj, v1.EventTypeWarning, "UnexpectedJob", "Saw a job that the controller did not create or forgot: %v", j.Name)
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// We found an unfinished job that has us as the parent, but it is not in our Active list.
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// This could happen if we crashed right after creating the Job and before updating the status,
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// or if our jobs list is newer than our sj status after a relist, or if someone intentionally created
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// a job that they wanted us to adopt.
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// TODO: maybe handle the adoption case? Concurrency/suspend rules will not apply in that case, obviously, since we can't
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// stop users from creating jobs if they have permission. It is assumed that if a
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// user has permission to create a job within a namespace, then they have permission to make any scheduledJob
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// in the same namespace "adopt" that job. ReplicaSets and their Pods work the same way.
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// TBS: how to update sj.Status.LastScheduleTime if the adopted job is newer than any we knew about?
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} else if found && IsJobFinished(&j) {
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deleteFromActiveList(&sj, j.ObjectMeta.UID)
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// TODO: event to call out failure vs success.
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recorder.Eventf(&sj, v1.EventTypeNormal, "SawCompletedJob", "Saw completed job: %v", j.Name)
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}
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}
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// Remove any job reference from the active list if the corresponding job does not exist any more.
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// Otherwise, the cronjob may be stuck in active mode forever even though there is no matching
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// job running.
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for _, j := range sj.Status.Active {
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if found := childrenJobs[j.UID]; !found {
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recorder.Eventf(&sj, v1.EventTypeNormal, "MissingJob", "Active job went missing: %v", j.Name)
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deleteFromActiveList(&sj, j.UID)
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}
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}
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updatedSJ, err := sjc.UpdateStatus(&sj)
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if err != nil {
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glog.Errorf("Unable to update status for %s (rv = %s): %v", nameForLog, sj.ResourceVersion, err)
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}
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sj = *updatedSJ
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if sj.Spec.Suspend != nil && *sj.Spec.Suspend {
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glog.V(4).Infof("Not starting job for %s because it is suspended", nameForLog)
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return
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}
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times, err := getRecentUnmetScheduleTimes(sj, now)
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if err != nil {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedNeedsStart", "Cannot determine if job needs to be started: %v", err)
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glog.Errorf("Cannot determine if %s needs to be started: %v", nameForLog, err)
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}
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// TODO: handle multiple unmet start times, from oldest to newest, updating status as needed.
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if len(times) == 0 {
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glog.V(4).Infof("No unmet start times for %s", nameForLog)
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return
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}
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if len(times) > 1 {
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glog.V(4).Infof("Multiple unmet start times for %s so only starting last one", nameForLog)
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}
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scheduledTime := times[len(times)-1]
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tooLate := false
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if sj.Spec.StartingDeadlineSeconds != nil {
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tooLate = scheduledTime.Add(time.Second * time.Duration(*sj.Spec.StartingDeadlineSeconds)).Before(now)
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}
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if tooLate {
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glog.V(4).Infof("Missed starting window for %s", nameForLog)
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// TODO: generate an event for a miss. Use a warning level event because it indicates a
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// problem with the controller (restart or long queue), and is not expected by user either.
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// Since we don't set LastScheduleTime when not scheduling, we are going to keep noticing
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// the miss every cycle. In order to avoid sending multiple events, and to avoid processing
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// the sj again and again, we could set a Status.LastMissedTime when we notice a miss.
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// Then, when we call getRecentUnmetScheduleTimes, we can take max(creationTimestamp,
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// Status.LastScheduleTime, Status.LastMissedTime), and then so we won't generate
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// and event the next time we process it, and also so the user looking at the status
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// can see easily that there was a missed execution.
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return
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}
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if sj.Spec.ConcurrencyPolicy == batch.ForbidConcurrent && len(sj.Status.Active) > 0 {
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// Regardless which source of information we use for the set of active jobs,
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// there is some risk that we won't see an active job when there is one.
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// (because we haven't seen the status update to the SJ or the created pod).
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// So it is theoretically possible to have concurrency with Forbid.
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// As long the as the invokations are "far enough apart in time", this usually won't happen.
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//
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// TODO: for Forbid, we could use the same name for every execution, as a lock.
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// With replace, we could use a name that is deterministic per execution time.
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// But that would mean that you could not inspect prior successes or failures of Forbid jobs.
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glog.V(4).Infof("Not starting job for %s because of prior execution still running and concurrency policy is Forbid", nameForLog)
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return
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}
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if sj.Spec.ConcurrencyPolicy == batch.ReplaceConcurrent {
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for _, j := range sj.Status.Active {
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// TODO: this should be replaced with server side job deletion
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// currently this mimics JobReaper from pkg/kubectl/stop.go
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glog.V(4).Infof("Deleting job %s of %s that was still running at next scheduled start time", j.Name, nameForLog)
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job, err := jc.GetJob(j.Namespace, j.Name)
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if err != nil {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedGet", "Get job: %v", err)
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return
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}
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// scale job down to 0
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if *job.Spec.Parallelism != 0 {
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zero := int32(0)
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job.Spec.Parallelism = &zero
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job, err = jc.UpdateJob(job.Namespace, job)
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if err != nil {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedUpdate", "Update job: %v", err)
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return
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}
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}
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// remove all pods...
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selector, _ := metav1.LabelSelectorAsSelector(job.Spec.Selector)
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options := metav1.ListOptions{LabelSelector: selector.String()}
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podList, err := pc.ListPods(job.Namespace, options)
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if err != nil {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedList", "List job-pods: %v", err)
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}
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errList := []error{}
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for _, pod := range podList.Items {
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glog.V(2).Infof("CronJob controller is deleting Pod %v/%v", pod.Namespace, pod.Name)
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if err := pc.DeletePod(pod.Namespace, pod.Name); err != nil {
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// ignores the error when the pod isn't found
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if !errors.IsNotFound(err) {
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errList = append(errList, err)
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}
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}
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}
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if len(errList) != 0 {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedDelete", "Deleted job-pods: %v", utilerrors.NewAggregate(errList))
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return
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}
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// ... the job itself...
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if err := jc.DeleteJob(job.Namespace, job.Name); err != nil {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedDelete", "Deleted job: %v", err)
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glog.Errorf("Error deleting job %s from %s: %v", job.Name, nameForLog, err)
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return
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}
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// ... and its reference from active list
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deleteFromActiveList(&sj, job.ObjectMeta.UID)
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recorder.Eventf(&sj, v1.EventTypeNormal, "SuccessfulDelete", "Deleted job %v", j.Name)
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}
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}
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jobReq, err := getJobFromTemplate(&sj, scheduledTime)
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if err != nil {
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glog.Errorf("Unable to make Job from template in %s: %v", nameForLog, err)
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return
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}
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jobResp, err := jc.CreateJob(sj.Namespace, jobReq)
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if err != nil {
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recorder.Eventf(&sj, v1.EventTypeWarning, "FailedCreate", "Error creating job: %v", err)
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return
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}
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glog.V(4).Infof("Created Job %s for %s", jobResp.Name, nameForLog)
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recorder.Eventf(&sj, v1.EventTypeNormal, "SuccessfulCreate", "Created job %v", jobResp.Name)
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// ------------------------------------------------------------------ //
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// If this process restarts at this point (after posting a job, but
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// before updating the status), then we might try to start the job on
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// the next time. Actually, if we relist the SJs and Jobs on the next
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// iteration of SyncAll, we might not see our own status update, and
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// then post one again. So, we need to use the job name as a lock to
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// prevent us from making the job twice (name the job with hash of its
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// scheduled time).
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// Add the just-started job to the status list.
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ref, err := getRef(jobResp)
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if err != nil {
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glog.V(2).Infof("Unable to make object reference for job for %s", nameForLog)
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} else {
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sj.Status.Active = append(sj.Status.Active, *ref)
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}
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sj.Status.LastScheduleTime = &metav1.Time{Time: scheduledTime}
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if _, err := sjc.UpdateStatus(&sj); err != nil {
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glog.Infof("Unable to update status for %s (rv = %s): %v", nameForLog, sj.ResourceVersion, err)
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}
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return
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}
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func getRef(object runtime.Object) (*v1.ObjectReference, error) {
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return v1.GetReference(object)
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}
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