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smart.go
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smart.go
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package perconaservermongodb
import (
"context"
"fmt"
"sort"
"strings"
"time"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
k8sErrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/util/retry"
k8sclient "sigs.k8s.io/controller-runtime/pkg/client"
logf "sigs.k8s.io/controller-runtime/pkg/log"
api "github.com/percona/percona-server-mongodb-operator/pkg/apis/psmdb/v1"
"github.com/percona/percona-server-mongodb-operator/pkg/psmdb"
"github.com/percona/percona-server-mongodb-operator/pkg/psmdb/backup"
)
func (r *ReconcilePerconaServerMongoDB) smartUpdate(ctx context.Context, cr *api.PerconaServerMongoDB, sfs *appsv1.StatefulSet,
replset *api.ReplsetSpec,
) error {
log := logf.FromContext(ctx)
if replset.Size == 0 {
return nil
}
if cr.Spec.UpdateStrategy != api.SmartUpdateStatefulSetStrategyType {
return nil
}
matchLabels := map[string]string{
"app.kubernetes.io/name": "percona-server-mongodb",
"app.kubernetes.io/instance": cr.Name,
"app.kubernetes.io/replset": replset.Name,
"app.kubernetes.io/managed-by": "percona-server-mongodb-operator",
"app.kubernetes.io/part-of": "percona-server-mongodb",
}
label, ok := sfs.Labels["app.kubernetes.io/component"]
if ok {
matchLabels["app.kubernetes.io/component"] = label
}
list := corev1.PodList{}
if err := r.client.List(ctx,
&list,
&k8sclient.ListOptions{
Namespace: cr.Namespace,
LabelSelector: labels.SelectorFromSet(matchLabels),
},
); err != nil {
return fmt.Errorf("get pod list: %v", err)
}
if !isSfsChanged(sfs, &list) {
return nil
}
if cr.CompareVersion("1.4.0") < 0 {
return nil
}
mongosFirst, err := r.shouldUpdateMongosFirst(ctx, cr)
if err != nil {
return errors.Wrap(err, "should update mongos first")
}
if mongosFirst {
return nil
}
if cr.Spec.Sharding.Enabled && sfs.Name != cr.Name+"-"+api.ConfigReplSetName {
cfgSfs := appsv1.StatefulSet{}
err := r.client.Get(ctx, types.NamespacedName{Name: cr.Name + "-" + api.ConfigReplSetName, Namespace: cr.Namespace}, &cfgSfs)
if err != nil {
return errors.Wrapf(err, "get config statefulset %s/%s", cr.Namespace, cr.Name+"-"+api.ConfigReplSetName)
}
cfgList, err := psmdb.GetRSPods(ctx, r.client, cr, api.ConfigReplSetName)
if err != nil {
return errors.Wrap(err, "get cfg pod list")
}
if isSfsChanged(&cfgSfs, &cfgList) {
log.Info("waiting for config RS update")
return nil
}
}
log.Info("StatefulSet is changed, starting smart update", "name", sfs.Name)
if sfs.Status.ReadyReplicas < sfs.Status.Replicas {
log.Info("can't start/continue 'SmartUpdate': waiting for all replicas are ready")
return nil
}
isBackupRunning, err := r.isBackupRunning(ctx, cr)
if err != nil {
return errors.Wrap(err, "failed to check active backups")
}
if isBackupRunning {
log.Info("can't start 'SmartUpdate': waiting for running backups to be finished")
return nil
}
hasActiveJobs, err := backup.HasActiveJobs(ctx, r.newPBM, r.client, cr, backup.Job{}, backup.NotPITRLock)
if err != nil {
return errors.Wrap(err, "failed to check active jobs")
}
_, ok = sfs.Annotations[api.AnnotationRestoreInProgress]
if !ok && hasActiveJobs {
log.Info("can't start 'SmartUpdate': waiting for active jobs to be finished")
return nil
}
if sfs.Name == cr.Name+"-"+api.ConfigReplSetName {
err = r.disableBalancer(ctx, cr)
if err != nil {
return errors.Wrap(err, "failed to stop balancer")
}
}
waitLimit := int(replset.LivenessProbe.InitialDelaySeconds)
sort.Slice(list.Items, func(i, j int) bool {
return list.Items[i].Name > list.Items[j].Name
})
var primaryPod corev1.Pod
for _, pod := range list.Items {
isPrimary, err := r.isPodPrimary(ctx, cr, pod, replset)
if err != nil {
return errors.Wrap(err, "is pod primary")
}
if isPrimary {
primaryPod = pod
continue
}
log.Info("apply changes to secondary pod", "pod", pod.Name)
updateRevision := sfs.Status.UpdateRevision
if pod.Labels["app.kubernetes.io/component"] == "arbiter" {
arbiterSfs, err := r.getArbiterStatefulset(ctx, cr, pod.Labels["app.kubernetes.io/replset"])
if err != nil {
return errors.Wrap(err, "failed to get arbiter statefulset")
}
updateRevision = arbiterSfs.Status.UpdateRevision
}
if err := r.applyNWait(ctx, cr, updateRevision, &pod, waitLimit); err != nil {
return errors.Wrap(err, "failed to apply changes")
}
}
// If the primary is external, we can't match it with a running pod and
// it'll have an empty name
if sfs.Labels["app.kubernetes.io/component"] != "nonVoting" && len(primaryPod.Name) > 0 {
forceStepDown := replset.Size == 1
log.Info("doing step down...", "force", forceStepDown)
client, err := r.mongoClientWithRole(ctx, cr, *replset, api.RoleClusterAdmin)
if err != nil {
return fmt.Errorf("failed to get mongo client: %v", err)
}
defer func() {
err := client.Disconnect(ctx)
if err != nil {
log.Error(err, "failed to close connection")
}
}()
err = client.StepDown(ctx, 60, forceStepDown)
if err != nil {
if strings.Contains(err.Error(), "No electable secondaries caught up") {
err = client.StepDown(ctx, 60, true)
if err != nil {
return errors.Wrap(err, "failed to do forced step down")
}
} else {
return errors.Wrap(err, "failed to do step down")
}
}
log.Info("apply changes to primary pod", "pod", primaryPod.Name)
if err := r.applyNWait(ctx, cr, sfs.Status.UpdateRevision, &primaryPod, waitLimit); err != nil {
return fmt.Errorf("failed to apply changes: %v", err)
}
}
log.Info("smart update finished for statefulset", "statefulset", sfs.Name)
return nil
}
func (r *ReconcilePerconaServerMongoDB) shouldUpdateMongosFirst(ctx context.Context, cr *api.PerconaServerMongoDB) (bool, error) {
if !cr.Spec.Sharding.Enabled {
return false, nil
}
c := new(api.PerconaServerMongoDB)
if err := r.client.Get(ctx, types.NamespacedName{Name: cr.Name, Namespace: cr.Namespace}, c); err != nil {
return false, errors.Wrap(err, "failed to get cr")
}
_, ok := c.Annotations[api.AnnotationUpdateMongosFirst]
return ok, nil
}
func (r *ReconcilePerconaServerMongoDB) setUpdateMongosFirst(ctx context.Context, cr *api.PerconaServerMongoDB) error {
if !cr.Spec.Sharding.Enabled {
return nil
}
return retry.RetryOnConflict(retry.DefaultBackoff, func() error {
c := new(api.PerconaServerMongoDB)
if err := r.client.Get(ctx, types.NamespacedName{Name: cr.Name, Namespace: cr.Namespace}, c); err != nil {
return err
}
c.Annotations[api.AnnotationUpdateMongosFirst] = "true"
return r.client.Update(ctx, c)
})
}
func (r *ReconcilePerconaServerMongoDB) unsetUpdateMongosFirst(ctx context.Context, cr *api.PerconaServerMongoDB) error {
if !cr.Spec.Sharding.Enabled {
return nil
}
return retry.RetryOnConflict(retry.DefaultBackoff, func() error {
c := new(api.PerconaServerMongoDB)
if err := r.client.Get(ctx, types.NamespacedName{Name: cr.Name, Namespace: cr.Namespace}, c); err != nil {
return err
}
if _, ok := c.Annotations[api.AnnotationUpdateMongosFirst]; !ok {
return nil
}
delete(c.Annotations, api.AnnotationUpdateMongosFirst)
return r.client.Update(ctx, c)
})
}
func (r *ReconcilePerconaServerMongoDB) setPrimary(ctx context.Context, cr *api.PerconaServerMongoDB, rs *api.ReplsetSpec, expectedPrimary corev1.Pod) error {
primary, err := r.isPodPrimary(ctx, cr, expectedPrimary, rs)
if err != nil {
return errors.Wrap(err, "is pod primary")
}
if primary {
return nil
}
sts, err := r.getRsStatefulset(ctx, cr, rs.Name)
if err != nil {
return errors.Wrap(err, "get rs statefulset")
}
pods := &corev1.PodList{}
err = r.client.List(ctx,
pods,
&k8sclient.ListOptions{
Namespace: cr.Namespace,
LabelSelector: labels.SelectorFromSet(sts.Spec.Template.Labels),
},
)
if err != nil {
return errors.Wrap(err, "get rs statefulset")
}
sleepSeconds := int(*rs.TerminationGracePeriodSeconds) * len(pods.Items)
var primaryPod corev1.Pod
for _, pod := range pods.Items {
if expectedPrimary.Name == pod.Name {
continue
}
primary, err := r.isPodPrimary(ctx, cr, pod, rs)
if err != nil {
return errors.Wrap(err, "is pod primary")
}
// If we found a primary, we need to call `replSetStepDown` on it after calling `replSetFreeze` on all other pods
if primary {
primaryPod = pod
continue
}
err = r.freezePod(ctx, cr, rs, pod, sleepSeconds)
if err != nil {
return errors.Wrapf(err, "failed to freeze %s pod", pod.Name)
}
}
if err := r.stepDownPod(ctx, cr, rs, primaryPod, sleepSeconds); err != nil {
return errors.Wrap(err, "failed to step down primary pod")
}
return nil
}
func (r *ReconcilePerconaServerMongoDB) stepDownPod(ctx context.Context, cr *api.PerconaServerMongoDB, rs *api.ReplsetSpec, pod corev1.Pod, seconds int) error {
log := logf.FromContext(ctx)
mgoClient, err := r.standaloneClientWithRole(ctx, cr, rs, api.RoleClusterAdmin, pod)
if err != nil {
return errors.Wrap(err, "failed to create standalone client")
}
defer func() {
err := mgoClient.Disconnect(ctx)
if err != nil {
log.Error(err, "failed to close connection")
}
}()
if err := mgoClient.StepDown(ctx, seconds, false); err != nil {
return errors.Wrap(err, "failed to step down")
}
return nil
}
func (r *ReconcilePerconaServerMongoDB) freezePod(ctx context.Context, cr *api.PerconaServerMongoDB, rs *api.ReplsetSpec, pod corev1.Pod, seconds int) error {
log := logf.FromContext(ctx)
mgoClient, err := r.standaloneClientWithRole(ctx, cr, rs, api.RoleClusterAdmin, pod)
if err != nil {
return errors.Wrap(err, "failed to create standalone client")
}
defer func() {
err := mgoClient.Disconnect(ctx)
if err != nil {
log.Error(err, "failed to close connection")
}
}()
if err := mgoClient.Freeze(ctx, seconds); err != nil {
return errors.Wrap(err, "failed to freeze")
}
return nil
}
func (r *ReconcilePerconaServerMongoDB) isPodPrimary(ctx context.Context, cr *api.PerconaServerMongoDB, pod corev1.Pod, rs *api.ReplsetSpec) (bool, error) {
log := logf.FromContext(ctx)
mgoClient, err := r.standaloneClientWithRole(ctx, cr, rs, api.RoleClusterAdmin, pod)
if err != nil {
return false, errors.Wrap(err, "failed to create standalone client")
}
defer func() {
err := mgoClient.Disconnect(ctx)
if err != nil {
log.Error(err, "failed to close connection")
}
}()
isMaster, err := mgoClient.IsMaster(ctx)
if err != nil {
return false, errors.Wrap(err, "is master")
}
return isMaster.IsMaster, nil
}
func (r *ReconcilePerconaServerMongoDB) smartMongosUpdate(ctx context.Context, cr *api.PerconaServerMongoDB, sts *appsv1.StatefulSet) error {
log := logf.FromContext(ctx)
if cr.Spec.Sharding.Mongos.Size == 0 || cr.Spec.UpdateStrategy != api.SmartUpdateStatefulSetStrategyType {
return nil
}
list, err := r.getMongosPods(ctx, cr)
if err != nil {
return errors.Wrap(err, "get mongos pods")
}
if !isSfsChanged(sts, &list) {
return nil
}
log.Info("StatefulSet is changed, starting smart update", "name", sts.Name)
if sts.Status.ReadyReplicas < sts.Status.Replicas {
log.Info("can't start/continue 'SmartUpdate': waiting for all replicas are ready")
return nil
}
isBackupRunning, err := r.isBackupRunning(ctx, cr)
if err != nil {
return errors.Wrap(err, "failed to check active backups")
}
if isBackupRunning {
log.Info("can't start 'SmartUpdate': waiting for running backups to be finished")
return nil
}
hasActiveJobs, err := backup.HasActiveJobs(ctx, r.newPBM, r.client, cr, backup.Job{}, backup.NotPITRLock)
if err != nil {
return errors.Wrap(err, "failed to check active jobs")
}
if hasActiveJobs {
log.Info("can't start 'SmartUpdate': waiting for active jobs to be finished")
return nil
}
waitLimit := int(cr.Spec.Sharding.Mongos.LivenessProbe.InitialDelaySeconds)
sort.Slice(list.Items, func(i, j int) bool {
return list.Items[i].Name > list.Items[j].Name
})
for _, pod := range list.Items {
if err := r.applyNWait(ctx, cr, sts.Status.UpdateRevision, &pod, waitLimit); err != nil {
return errors.Wrap(err, "failed to apply changes")
}
}
if err := r.unsetUpdateMongosFirst(ctx, cr); err != nil {
return errors.Wrap(err, "unset update mongos first")
}
log.Info("smart update finished for mongos statefulset")
return nil
}
func (r *ReconcilePerconaServerMongoDB) isStsListUpToDate(ctx context.Context, cr *api.PerconaServerMongoDB, stsList *appsv1.StatefulSetList) (bool, error) {
for _, s := range stsList.Items {
podList := new(corev1.PodList)
if err := r.client.List(ctx, podList,
&k8sclient.ListOptions{
Namespace: cr.Namespace,
LabelSelector: labels.SelectorFromSet(s.Labels),
}); err != nil {
return false, errors.Errorf("failed to get statefulset %s pods: %v", s.Name, err)
}
if s.Status.UpdatedReplicas < s.Status.Replicas || isSfsChanged(&s, podList) {
logf.FromContext(ctx).Info("StatefulSet is not up to date", "sts", s.Name)
return false, nil
}
}
return true, nil
}
func (r *ReconcilePerconaServerMongoDB) isAllSfsUpToDate(ctx context.Context, cr *api.PerconaServerMongoDB) (bool, error) {
sfsList := appsv1.StatefulSetList{}
if err := r.client.List(ctx, &sfsList,
&k8sclient.ListOptions{
Namespace: cr.Namespace,
LabelSelector: labels.SelectorFromSet(map[string]string{
"app.kubernetes.io/instance": cr.Name,
}),
},
); err != nil {
return false, errors.Wrap(err, "failed to get statefulset list")
}
return r.isStsListUpToDate(ctx, cr, &sfsList)
}
func (r *ReconcilePerconaServerMongoDB) applyNWait(ctx context.Context, cr *api.PerconaServerMongoDB, updateRevision string, pod *corev1.Pod, waitLimit int) error {
if pod.ObjectMeta.Labels["controller-revision-hash"] == updateRevision {
logf.FromContext(ctx).Info("Pod already updated", "pod", pod.Name)
} else {
if err := r.client.Delete(ctx, pod); err != nil {
return errors.Wrap(err, "delete pod")
}
}
if err := r.waitPodRestart(ctx, cr, updateRevision, pod, waitLimit); err != nil {
return errors.Wrap(err, "wait pod restart")
}
return nil
}
func (r *ReconcilePerconaServerMongoDB) waitPodRestart(ctx context.Context, cr *api.PerconaServerMongoDB, updateRevision string, pod *corev1.Pod, waitLimit int) error {
for i := 0; i < waitLimit; i++ {
time.Sleep(time.Second * 1)
err := r.client.Get(ctx, types.NamespacedName{Name: pod.Name, Namespace: pod.Namespace}, pod)
if err != nil && !k8sErrors.IsNotFound(err) {
return errors.Wrap(err, "get pod")
}
// We update status in every loop to not wait until the end of smart update
if err := r.updateStatus(ctx, cr, nil, api.AppStateInit); err != nil {
return errors.Wrap(err, "update status")
}
ready := false
for _, container := range pod.Status.ContainerStatuses {
switch container.Name {
case "mongod", "mongod-arbiter", "mongod-nv", "mongos":
ready = container.Ready
}
}
if pod.Status.Phase == corev1.PodRunning && pod.ObjectMeta.Labels["controller-revision-hash"] == updateRevision && ready {
logf.FromContext(ctx).Info("Pod started", "pod", pod.Name)
return nil
}
}
return errors.New("reach pod wait limit")
}
func isSfsChanged(sfs *appsv1.StatefulSet, podList *corev1.PodList) bool {
if sfs.Status.UpdateRevision == "" {
return false
}
for _, pod := range podList.Items {
if pod.Labels["app.kubernetes.io/component"] != sfs.Labels["app.kubernetes.io/component"] {
continue
}
if pod.ObjectMeta.Labels["controller-revision-hash"] != sfs.Status.UpdateRevision {
return true
}
}
return false
}