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Initial implementation for the statefulset annotations indicating rolling updates.

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This commit is contained in:
Oleksii Kliukin
2018-05-07 08:07:37 +02:00
committed by Oleksii Kliukin
parent 43a1db2128
commit ce0d4af91c
5 changed files with 95 additions and 94 deletions
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pkg/cluster/util.go
-57
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@@ -39,10 +39,6 @@ func NewSecretOauthTokenGetter(kubeClient *k8sutil.KubernetesClient,
return &SecretOauthTokenGetter{kubeClient, OAuthTokenSecretName}
}
const (
podControllerRevisionHashLabel = "controller-revision-hash"
)
func (g *SecretOauthTokenGetter) getOAuthToken() (string, error) {
//TODO: we can move this function to the Controller in case it will be needed there. As for now we use it only in the Cluster
// Temporary getting postgresql-operator secret from the NamespaceDefault
@@ -462,56 +458,3 @@ func (c *Cluster) GetSpec() (*spec.Postgresql, error) {
func (c *Cluster) patroniUsesKubernetes() bool {
return c.OpConfig.EtcdHost == ""
}
func (c *Cluster) setPendingRollingUpgrade(val bool) {
if c.pendingRollingUpdate == nil {
c.pendingRollingUpdate = new(bool)
}
*c.pendingRollingUpdate = val
c.logger.Debugf("pending rolling upgrade was set to %b", val)
}
// resolvePendingRollingUpdate figures out if rolling upgrade is necessary
// based on the states of the cluster statefulset and pods
func (c *Cluster) resolvePendingRollingUpdate(sset *v1beta1.StatefulSet) error {
// XXX: it looks like we will always trigger a rolling update if the
// pods are on a different revision from a statefulset, even if the
// statefulset change that caused it didn't require a rolling update
// originally.
if c.pendingRollingUpdate != nil {
return nil
}
c.logger.Debugf("evaluating rolling upgrade requirement")
effectiveRevision := sset.Status.UpdateRevision
if effectiveRevision == "" {
if sset.Status.CurrentRevision == "" {
c.logger.Debugf("statefulset doesn't have a current revision, no rolling upgrade")
// the statefulset does not have a currentRevision, it must be new; hence, no rollingUpdate
c.setPendingRollingUpgrade(false)
return nil
}
effectiveRevision = sset.Status.CurrentRevision
}
// fetch all pods related to this cluster
pods, err := c.listPods()
if err != nil {
return err
}
// check their revisions
for _, pod := range pods {
podRevision, present := pod.Labels[podControllerRevisionHashLabel]
// empty or missing revision indicates a new pod - doesn't need a rolling upgrade
if !present || podRevision == "" {
continue
}
c.logger.Debugf("observing pod revision %q vs statefulset revision %q", podRevision, effectiveRevision)
if podRevision != effectiveRevision {
// pod is on a different revision - trigger the rolling upgrade
c.setPendingRollingUpgrade(true)
return nil
}
}
c.setPendingRollingUpgrade(false)
return nil
}