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cluster.go
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cluster.go
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package cluster
// Postgres ThirdPartyResource object i.e. Spilo
import (
"database/sql"
"encoding/json"
"fmt"
"reflect"
"regexp"
"sync"
"github.com/Sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/pkg/api/v1"
"k8s.io/client-go/pkg/apis/apps/v1beta1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"github.com/zalando-incubator/postgres-operator/pkg/spec"
"github.com/zalando-incubator/postgres-operator/pkg/util"
"github.com/zalando-incubator/postgres-operator/pkg/util/config"
"github.com/zalando-incubator/postgres-operator/pkg/util/constants"
"github.com/zalando-incubator/postgres-operator/pkg/util/k8sutil"
"github.com/zalando-incubator/postgres-operator/pkg/util/patroni"
"github.com/zalando-incubator/postgres-operator/pkg/util/teams"
"github.com/zalando-incubator/postgres-operator/pkg/util/users"
"github.com/zalando-incubator/postgres-operator/pkg/util/volumes"
)
var (
alphaNumericRegexp = regexp.MustCompile("^[a-zA-Z][a-zA-Z0-9]*$")
databaseNameRegexp = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$")
userRegexp = regexp.MustCompile(`^[a-z0-9]([-_a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-_a-z0-9]*[a-z0-9])?)*$`)
)
// Config contains operator-wide clients and configuration used from a cluster. TODO: remove struct duplication.
type Config struct {
OpConfig config.Config
RestConfig *rest.Config
InfrastructureRoles map[string]spec.PgUser // inherited from the controller
}
type kubeResources struct {
Services map[PostgresRole]*v1.Service
Endpoint *v1.Endpoints
Secrets map[types.UID]*v1.Secret
Statefulset *v1beta1.StatefulSet
//Pods are treated separately
//PVCs are treated separately
}
// Cluster describes postgresql cluster
type Cluster struct {
kubeResources
spec.Postgresql
Config
logger *logrus.Entry
patroni patroni.Interface
pgUsers map[string]spec.PgUser
systemUsers map[string]spec.PgUser
podSubscribers map[spec.NamespacedName]chan spec.PodEvent
podSubscribersMu sync.RWMutex
pgDb *sql.DB
mu sync.Mutex
masterLess bool
userSyncStrategy spec.UserSyncer
deleteOptions *metav1.DeleteOptions
podEventsQueue *cache.FIFO
teamsAPIClient *teams.API
KubeClient k8sutil.KubernetesClient //TODO: move clients to the better place?
}
type compareStatefulsetResult struct {
match bool
replace bool
rollingUpdate bool
reasons []string
}
// New creates a new cluster. This function should be called from a controller.
func New(cfg Config, kubeClient k8sutil.KubernetesClient, pgSpec spec.Postgresql, logger *logrus.Entry) *Cluster {
orphanDependents := true
podEventsQueue := cache.NewFIFO(func(obj interface{}) (string, error) {
e, ok := obj.(spec.PodEvent)
if !ok {
return "", fmt.Errorf("could not cast to PodEvent")
}
return fmt.Sprintf("%s-%s", e.PodName, e.ResourceVersion), nil
})
cluster := &Cluster{
Config: cfg,
Postgresql: pgSpec,
pgUsers: make(map[string]spec.PgUser),
systemUsers: make(map[string]spec.PgUser),
podSubscribers: make(map[spec.NamespacedName]chan spec.PodEvent),
kubeResources: kubeResources{Secrets: make(map[types.UID]*v1.Secret), Services: make(map[PostgresRole]*v1.Service)},
masterLess: false,
userSyncStrategy: users.DefaultUserSyncStrategy{},
deleteOptions: &metav1.DeleteOptions{OrphanDependents: &orphanDependents},
podEventsQueue: podEventsQueue,
KubeClient: kubeClient,
teamsAPIClient: teams.NewTeamsAPI(cfg.OpConfig.TeamsAPIUrl, logger),
}
cluster.logger = logger.WithField("pkg", "cluster").WithField("cluster-name", cluster.clusterName())
cluster.patroni = patroni.New(cluster.logger)
return cluster
}
func (c *Cluster) clusterName() spec.NamespacedName {
return util.NameFromMeta(c.ObjectMeta)
}
func (c *Cluster) teamName() string {
// TODO: check Teams API for the actual name (in case the user passes an integer Id).
return c.Spec.TeamID
}
func (c *Cluster) setStatus(status spec.PostgresStatus) {
c.Status = status
b, err := json.Marshal(status)
if err != nil {
c.logger.Fatalf("could not marshal status: %v", err)
}
request := []byte(fmt.Sprintf(`{"status": %s}`, string(b))) //TODO: Look into/wait for k8s go client methods
_, err = c.KubeClient.RESTClient.Patch(types.MergePatchType).
RequestURI(c.GetSelfLink()).
Body(request).
DoRaw()
if k8sutil.ResourceNotFound(err) {
c.logger.Warningf("could not set %q status for the non-existing cluster", status)
return
}
if err != nil {
c.logger.Warningf("could not set %q status for the cluster: %v", status, err)
}
}
// initUsers populates c.systemUsers and c.pgUsers maps.
func (c *Cluster) initUsers() error {
c.initSystemUsers()
if err := c.initInfrastructureRoles(); err != nil {
return fmt.Errorf("could not init infrastructure roles: %v", err)
}
if err := c.initRobotUsers(); err != nil {
return fmt.Errorf("could not init robot users: %v", err)
}
if err := c.initHumanUsers(); err != nil {
return fmt.Errorf("could not init human users: %v", err)
}
return nil
}
// Create creates the new kubernetes objects associated with the cluster.
func (c *Cluster) Create() error {
c.mu.Lock()
defer c.mu.Unlock()
var (
err error
service *v1.Service
ep *v1.Endpoints
ss *v1beta1.StatefulSet
)
defer func() {
if err == nil {
c.setStatus(spec.ClusterStatusRunning) //TODO: are you sure it's running?
} else {
c.setStatus(spec.ClusterStatusAddFailed)
}
}()
c.setStatus(spec.ClusterStatusCreating)
//TODO: service will create endpoint implicitly
ep, err = c.createEndpoint()
if err != nil {
return fmt.Errorf("could not create endpoint: %v", err)
}
c.logger.Infof("endpoint %q has been successfully created", util.NameFromMeta(ep.ObjectMeta))
for _, role := range []PostgresRole{Master, Replica} {
if role == Replica && !c.Spec.ReplicaLoadBalancer {
continue
}
service, err = c.createService(role)
if err != nil {
return fmt.Errorf("could not create %s service: %v", role, err)
}
c.logger.Infof("%s service %q has been successfully created", role, util.NameFromMeta(service.ObjectMeta))
}
if err = c.initUsers(); err != nil {
return err
}
c.logger.Infof("users have been initialized")
if err = c.applySecrets(); err != nil {
return fmt.Errorf("could not create secrets: %v", err)
}
c.logger.Infof("secrets have been successfully created")
ss, err = c.createStatefulSet()
if err != nil {
return fmt.Errorf("could not create statefulset: %v", err)
}
c.logger.Infof("statefulset %q has been successfully created", util.NameFromMeta(ss.ObjectMeta))
c.logger.Info("waiting for the cluster being ready")
if err = c.waitStatefulsetPodsReady(); err != nil {
c.logger.Errorf("failed to create cluster: %v", err)
return err
}
c.logger.Infof("pods are ready")
if !(c.masterLess || c.databaseAccessDisabled()) {
if err := c.createRoles(); err != nil {
return fmt.Errorf("could not create users: %v", err)
}
if err := c.createDatabases(); err != nil {
return fmt.Errorf("could not create databases: %v", err)
}
c.logger.Infof("users have been successfully created")
} else {
if c.masterLess {
c.logger.Warnln("cluster is masterless")
}
}
err = c.listResources()
if err != nil {
c.logger.Errorf("could not list resources: %v", err)
}
return nil
}
func (c *Cluster) sameServiceWith(role PostgresRole, service *v1.Service) (match bool, reason string) {
//TODO: improve comparison
if c.Services[role].Spec.Type != service.Spec.Type {
return false, fmt.Sprintf("new %s service's type %q doesn't match the current one %q",
role, service.Spec.Type, c.Services[role].Spec.Type)
}
oldSourceRanges := c.Services[role].Spec.LoadBalancerSourceRanges
newSourceRanges := service.Spec.LoadBalancerSourceRanges
/* work around Kubernetes 1.6 serializing [] as nil. See https://github.com/kubernetes/kubernetes/issues/43203 */
if (len(oldSourceRanges) == 0) && (len(newSourceRanges) == 0) {
return true, ""
}
if !reflect.DeepEqual(oldSourceRanges, newSourceRanges) {
return false, fmt.Sprintf("new %s service's LoadBalancerSourceRange doesn't match the current one", role)
}
oldDNSAnnotation := c.Services[role].Annotations[constants.ZalandoDNSNameAnnotation]
newDNSAnnotation := service.Annotations[constants.ZalandoDNSNameAnnotation]
if oldDNSAnnotation != newDNSAnnotation {
return false, fmt.Sprintf("new %s service's %q annotation doesn't match the current one", role, constants.ZalandoDNSNameAnnotation)
}
return true, ""
}
func (c *Cluster) sameVolumeWith(volume spec.Volume) (match bool, reason string) {
if !reflect.DeepEqual(c.Spec.Volume, volume) {
reason = "new volume's specification doesn't match the current one"
} else {
match = true
}
return
}
func (c *Cluster) compareStatefulSetWith(statefulSet *v1beta1.StatefulSet) *compareStatefulsetResult {
reasons := make([]string, 0)
var match, needsRollUpdate, needsReplace bool
match = true
//TODO: improve me
if *c.Statefulset.Spec.Replicas != *statefulSet.Spec.Replicas {
match = false
reasons = append(reasons, "new statefulset's number of replicas doesn't match the current one")
}
if len(c.Statefulset.Spec.Template.Spec.Containers) != len(statefulSet.Spec.Template.Spec.Containers) {
needsRollUpdate = true
reasons = append(reasons, "new statefulset's container specification doesn't match the current one")
}
if len(c.Statefulset.Spec.Template.Spec.Containers) == 0 {
c.logger.Warningf("statefulset %q has no container", util.NameFromMeta(c.Statefulset.ObjectMeta))
return &compareStatefulsetResult{}
}
// In the comparisons below, the needsReplace and needsRollUpdate flags are never reset, since checks fall through
// and the combined effect of all the changes should be applied.
// TODO: log all reasons for changing the statefulset, not just the last one.
// TODO: make sure this is in sync with generatePodTemplate, ideally by using the same list of fields to generate
// the template and the diff
if c.Statefulset.Spec.Template.Spec.ServiceAccountName != statefulSet.Spec.Template.Spec.ServiceAccountName {
needsReplace = true
needsRollUpdate = true
reasons = append(reasons, "new statefulset's serviceAccountName service asccount name doesn't match the current one")
}
if *c.Statefulset.Spec.Template.Spec.TerminationGracePeriodSeconds != *statefulSet.Spec.Template.Spec.TerminationGracePeriodSeconds {
needsReplace = true
needsRollUpdate = true
reasons = append(reasons, "new statefulset's terminationGracePeriodSeconds doesn't match the current one")
}
// Some generated fields like creationTimestamp make it not possible to use DeepCompare on Spec.Template.ObjectMeta
if !reflect.DeepEqual(c.Statefulset.Spec.Template.Labels, statefulSet.Spec.Template.Labels) {
needsReplace = true
needsRollUpdate = true
reasons = append(reasons, "new statefulset's metadata labels doesn't match the current one")
}
if !reflect.DeepEqual(c.Statefulset.Spec.Template.Annotations, statefulSet.Spec.Template.Annotations) {
needsRollUpdate = true
needsReplace = true
reasons = append(reasons, "new statefulset's metadata annotations doesn't match the current one")
}
if len(c.Statefulset.Spec.VolumeClaimTemplates) != len(statefulSet.Spec.VolumeClaimTemplates) {
needsReplace = true
reasons = append(reasons, "new statefulset's volumeClaimTemplates contains different number of volumes to the old one")
}
for i := 0; i < len(c.Statefulset.Spec.VolumeClaimTemplates); i++ {
name := c.Statefulset.Spec.VolumeClaimTemplates[i].Name
// Some generated fields like creationTimestamp make it not possible to use DeepCompare on ObjectMeta
if name != statefulSet.Spec.VolumeClaimTemplates[i].Name {
needsReplace = true
reasons = append(reasons, fmt.Sprintf("new statefulset's name for volume %d doesn't match the current one", i))
continue
}
if !reflect.DeepEqual(c.Statefulset.Spec.VolumeClaimTemplates[i].Annotations, statefulSet.Spec.VolumeClaimTemplates[i].Annotations) {
needsReplace = true
reasons = append(reasons, fmt.Sprintf("new statefulset's annotations for volume %q doesn't match the current one", name))
}
if !reflect.DeepEqual(c.Statefulset.Spec.VolumeClaimTemplates[i].Spec, statefulSet.Spec.VolumeClaimTemplates[i].Spec) {
name := c.Statefulset.Spec.VolumeClaimTemplates[i].Name
needsReplace = true
reasons = append(reasons, fmt.Sprintf("new statefulset's volumeClaimTemplates specification for volume %q doesn't match the current one", name))
}
}
container1 := c.Statefulset.Spec.Template.Spec.Containers[0]
container2 := statefulSet.Spec.Template.Spec.Containers[0]
if container1.Image != container2.Image {
needsRollUpdate = true
reasons = append(reasons, "new statefulset's container image doesn't match the current one")
}
if !reflect.DeepEqual(container1.Ports, container2.Ports) {
needsRollUpdate = true
reasons = append(reasons, "new statefulset's container ports don't match the current one")
}
if !compareResources(&container1.Resources, &container2.Resources) {
needsRollUpdate = true
reasons = append(reasons, "new statefulset's container resources don't match the current ones")
}
if !reflect.DeepEqual(container1.Env, container2.Env) {
needsRollUpdate = true
reasons = append(reasons, "new statefulset's container environment doesn't match the current one")
}
if needsRollUpdate || needsReplace {
match = false
}
return &compareStatefulsetResult{match: match, reasons: reasons, rollingUpdate: needsRollUpdate, replace: needsReplace}
}
func compareResources(a *v1.ResourceRequirements, b *v1.ResourceRequirements) (equal bool) {
equal = true
if a != nil {
equal = compareResoucesAssumeFirstNotNil(a, b)
}
if equal && (b != nil) {
equal = compareResoucesAssumeFirstNotNil(b, a)
}
return
}
func compareResoucesAssumeFirstNotNil(a *v1.ResourceRequirements, b *v1.ResourceRequirements) bool {
if b == nil || (len(b.Requests) == 0) {
return (len(a.Requests) == 0)
}
for k, v := range a.Requests {
if (&v).Cmp(b.Requests[k]) != 0 {
return false
}
}
for k, v := range a.Limits {
if (&v).Cmp(b.Limits[k]) != 0 {
return false
}
}
return true
}
// Update changes Kubernetes objects according to the new specification. Unlike the sync case, the missing object.
// (i.e. service) is treated as an error.
func (c *Cluster) Update(newSpec *spec.Postgresql) error {
c.mu.Lock()
defer c.mu.Unlock()
c.setStatus(spec.ClusterStatusUpdating)
c.logger.Debugf("cluster update from version %q to %q",
c.ResourceVersion, newSpec.ResourceVersion)
/* Make sure we update when this function exists */
defer func() {
c.Postgresql = *newSpec
}()
for _, role := range []PostgresRole{Master, Replica} {
if role == Replica {
if !newSpec.Spec.ReplicaLoadBalancer {
// old spec had a load balancer, but the new one doesn't
if c.Spec.ReplicaLoadBalancer {
err := c.deleteService(role)
if err != nil {
return fmt.Errorf("could not delete obsolete %s service: %v", role, err)
}
c.logger.Infof("deleted obsolete %s service", role)
}
} else {
if !c.Spec.ReplicaLoadBalancer {
// old spec didn't have a load balancer, but the one does
service, err := c.createService(role)
if err != nil {
return fmt.Errorf("could not create new %s service: %v", role, err)
}
c.logger.Infof("%s service %q has been created", role, util.NameFromMeta(service.ObjectMeta))
}
}
// only proceed further if both old and new load balancer were present
if !(newSpec.Spec.ReplicaLoadBalancer && c.Spec.ReplicaLoadBalancer) {
continue
}
}
newService := c.generateService(role, &newSpec.Spec)
if match, reason := c.sameServiceWith(role, newService); !match {
c.logServiceChanges(role, c.Services[role], newService, true, reason)
if err := c.updateService(role, newService); err != nil {
c.setStatus(spec.ClusterStatusUpdateFailed)
return fmt.Errorf("could not update %s service: %v", role, err)
}
c.logger.Infof("%s service %q has been updated", role, util.NameFromMeta(c.Services[role].ObjectMeta))
}
}
newStatefulSet, err := c.generateStatefulSet(newSpec.Spec)
if err != nil {
return fmt.Errorf("could not generate statefulset: %v", err)
}
cmp := c.compareStatefulSetWith(newStatefulSet)
if !cmp.match {
c.logStatefulSetChanges(c.Statefulset, newStatefulSet, true, cmp.reasons)
//TODO: mind the case of updating allowedSourceRanges
if !cmp.replace {
if err := c.updateStatefulSet(newStatefulSet); err != nil {
c.setStatus(spec.ClusterStatusUpdateFailed)
return fmt.Errorf("could not upate statefulset: %v", err)
}
} else {
if err := c.replaceStatefulSet(newStatefulSet); err != nil {
c.setStatus(spec.ClusterStatusUpdateFailed)
return fmt.Errorf("could not replace statefulset: %v", err)
}
}
//TODO: if there is a change in numberOfInstances, make sure Pods have been created/deleted
c.logger.Infof("statefulset %q has been updated", util.NameFromMeta(c.Statefulset.ObjectMeta))
}
if c.Spec.PgVersion != newSpec.Spec.PgVersion { // PG versions comparison
c.logger.Warningf("postgresql version change(%q -> %q) is not allowed",
c.Spec.PgVersion, newSpec.Spec.PgVersion)
//TODO: rewrite pg version in tpr spec
}
if cmp.rollingUpdate {
c.logger.Infof("rolling update is needed")
// TODO: wait for actual streaming to the replica
if err := c.recreatePods(); err != nil {
c.setStatus(spec.ClusterStatusUpdateFailed)
return fmt.Errorf("could not recreate pods: %v", err)
}
c.logger.Infof("rolling update has been finished")
}
if match, reason := c.sameVolumeWith(newSpec.Spec.Volume); !match {
c.logVolumeChanges(c.Spec.Volume, newSpec.Spec.Volume, reason)
if err := c.resizeVolumes(newSpec.Spec.Volume, []volumes.VolumeResizer{&volumes.EBSVolumeResizer{}}); err != nil {
return fmt.Errorf("could not update volumes: %v", err)
}
c.logger.Infof("volumes have been updated successfully")
}
c.setStatus(spec.ClusterStatusRunning)
return nil
}
// Delete deletes the cluster and cleans up all objects associated with it (including statefulsets).
func (c *Cluster) Delete() error {
c.mu.Lock()
defer c.mu.Unlock()
if err := c.deleteEndpoint(); err != nil {
return fmt.Errorf("could not delete endpoint: %v", err)
}
for _, role := range []PostgresRole{Master, Replica} {
if role == Replica && !c.Spec.ReplicaLoadBalancer {
continue
}
if err := c.deleteService(role); err != nil {
return fmt.Errorf("could not delete %s service: %v", role, err)
}
}
if err := c.deleteStatefulSet(); err != nil {
return fmt.Errorf("could not delete statefulset: %v", err)
}
for _, obj := range c.Secrets {
if err := c.deleteSecret(obj); err != nil {
return fmt.Errorf("could not delete secret: %v", err)
}
}
return nil
}
// ReceivePodEvent is called back by the controller in order to add the cluster's pod event to the queue.
func (c *Cluster) ReceivePodEvent(event spec.PodEvent) {
if err := c.podEventsQueue.Add(event); err != nil {
c.logger.Errorf("error when receiving pod events: %v", err)
}
}
func (c *Cluster) processPodEvent(obj interface{}) error {
event, ok := obj.(spec.PodEvent)
if !ok {
return fmt.Errorf("could not cast to PodEvent")
}
c.podSubscribersMu.RLock()
subscriber, ok := c.podSubscribers[event.PodName]
c.podSubscribersMu.RUnlock()
if ok {
subscriber <- event
}
return nil
}
// Run starts the pod event dispatching for the given cluster.
func (c *Cluster) Run(stopCh <-chan struct{}) {
go c.processPodEventQueue(stopCh)
}
func (c *Cluster) processPodEventQueue(stopCh <-chan struct{}) {
for {
select {
case <-stopCh:
return
default:
if _, err := c.podEventsQueue.Pop(cache.PopProcessFunc(c.processPodEvent)); err != nil {
c.logger.Errorf("error when processing pod event queue %v", err)
}
}
}
}
func (c *Cluster) initSystemUsers() {
// We don't actually use that to create users, delegating this
// task to Patroni. Those definitions are only used to create
// secrets, therefore, setting flags like SUPERUSER or REPLICATION
// is not necessary here
c.systemUsers[constants.SuperuserKeyName] = spec.PgUser{
Name: c.OpConfig.SuperUsername,
Password: util.RandomPassword(constants.PasswordLength),
}
c.systemUsers[constants.ReplicationUserKeyName] = spec.PgUser{
Name: c.OpConfig.ReplicationUsername,
Password: util.RandomPassword(constants.PasswordLength),
}
}
func (c *Cluster) initRobotUsers() error {
for username, userFlags := range c.Spec.Users {
if !isValidUsername(username) {
return fmt.Errorf("invalid username: '%v'", username)
}
flags, err := normalizeUserFlags(userFlags)
if err != nil {
return fmt.Errorf("invalid flags for user '%v': %v", username, err)
}
c.pgUsers[username] = spec.PgUser{
Name: username,
Password: util.RandomPassword(constants.PasswordLength),
Flags: flags,
}
}
return nil
}
func (c *Cluster) initHumanUsers() error {
teamMembers, err := c.getTeamMembers()
if err != nil {
return fmt.Errorf("could not get list of team members: %v", err)
}
for _, username := range teamMembers {
flags := []string{constants.RoleFlagLogin, constants.RoleFlagSuperuser}
memberOf := []string{c.OpConfig.PamRoleName}
c.pgUsers[username] = spec.PgUser{Name: username, Flags: flags, MemberOf: memberOf}
}
return nil
}
func (c *Cluster) initInfrastructureRoles() error {
// add infrastucture roles from the operator's definition
for username, data := range c.InfrastructureRoles {
if !isValidUsername(username) {
return fmt.Errorf("invalid username: '%v'", username)
}
flags, err := normalizeUserFlags(data.Flags)
if err != nil {
return fmt.Errorf("invalid flags for user '%v': %v", username, err)
}
data.Flags = flags
c.pgUsers[username] = data
}
return nil
}
// GetStatus provides status of the cluster
func (c *Cluster) GetStatus() *spec.ClusterStatus {
return &spec.ClusterStatus{
Cluster: c.Spec.ClusterName,
Team: c.Spec.TeamID,
Status: c.Status,
Spec: c.Spec,
MasterService: c.GetServiceMaster(),
ReplicaService: c.GetServiceReplica(),
Endpoint: c.GetEndpoint(),
StatefulSet: c.GetStatefulSet(),
Error: c.Error,
}
}
// ManualFailover does manual failover to a candidate pod
func (c *Cluster) ManualFailover(curMaster *v1.Pod, candidate spec.NamespacedName) error {
c.logger.Debugf("failing over from %q to %q", curMaster.Name, candidate)
podLabelErr := make(chan error)
stopCh := make(chan struct{})
defer close(podLabelErr)
go func() {
ch := c.registerPodSubscriber(candidate)
defer c.unregisterPodSubscriber(candidate)
role := Master
select {
case <-stopCh:
case podLabelErr <- c.waitForPodLabel(ch, &role):
}
}()
if err := c.patroni.Failover(curMaster, candidate.Name); err != nil {
close(stopCh)
return fmt.Errorf("could not failover: %v", err)
}
c.logger.Debugf("successfully failed over from %q to %q", curMaster.Name, candidate)
defer close(stopCh)
if err := <-podLabelErr; err != nil {
return fmt.Errorf("could not get master pod label: %v", err)
}
return nil
}