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wait after config patch and restart on sync whenever we see pending_restart

This commit is contained in:
Felix Kunde 2021-10-21 13:07:39 +02:00
parent d3fe4264d4
commit 49668e95eb
3 changed files with 70 additions and 52 deletions
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31
e2e/tests/test_e2e.py
View File

@ -1066,8 +1066,8 @@ class EndToEndTestCase(unittest.TestCase):
k8s = self.k8s
leader = k8s.get_cluster_leader_pod()
replica = k8s.get_cluster_replica_pod()
labels = 'application=spilo,cluster-name=acid-minimal-cluster,spilo-role=master'
creationTimestamp = leader.metadata.creation_timestamp
masterCreationTimestamp = leader.metadata.creation_timestamp
replicaCreationTimestamp = replica.metadata.creation_timestamp
new_max_connections_value = "50"
# adjust Postgres config
@ -1116,8 +1116,18 @@ class EndToEndTestCase(unittest.TestCase):
"synchronous_mode not updated")
return True
# check if Patroni config has been updated
self.eventuallyTrue(compare_config, "Postgres config not applied")
# make sure that pods were not recreated
leader = k8s.get_cluster_leader_pod()
replica = k8s.get_cluster_replica_pod()
self.assertEqual(masterCreationTimestamp, leader.metadata.creation_timestamp,
"Master pod creation timestamp is updated")
self.assertEqual(replicaCreationTimestamp, replica.metadata.creation_timestamp,
"Master pod creation timestamp is updated")
# query max_connections setting
setting_query = """
SELECT setting
FROM pg_settings
@ -1128,11 +1138,16 @@ class EndToEndTestCase(unittest.TestCase):
self.eventuallyNotEqual(lambda: self.query_database(replica.metadata.name, "postgres", setting_query)[0], new_max_connections_value,
"Expected max_connections not to be updated on replica since Postgres was restarted there first", 10, 5)
# make sure that pod wasn't recreated
self.assertEqual(creationTimestamp, leader.metadata.creation_timestamp,
"Master pod creation timestamp is updated")
# the next sync should restart the replica because it has pending_restart flag set
# force next sync by deleting the operator pod
k8s.delete_operator_pod()
self.eventuallyEqual(lambda: k8s.get_operator_state(), {"0": "idle"}, "Operator does not get in sync")
self.eventuallyEqual(lambda: self.query_database(replica.metadata.name, "postgres", setting_query)[0], new_max_connections_value,
"New max_connections setting not applied on replica", 10, 5)
# decrease max_connections again
# this time restart will be correct and new value should appear on both instances
lower_max_connections_value = "30"
pg_patch_max_connections = {
"spec": {
@ -1149,12 +1164,14 @@ class EndToEndTestCase(unittest.TestCase):
self.eventuallyEqual(lambda: k8s.get_operator_state(), {"0": "idle"}, "Operator does not get in sync")
# check Patroni config again
pg_patch_config["spec"]["postgresql"]["parameters"]["max_connections"] = lower_max_connections_value
self.eventuallyTrue(compare_config, "Postgres config not applied")
self.eventuallyEqual(lambda: self.query_database(leader.metadata.name, "postgres", setting_query)[0], new_max_connections_value,
# and query max_connections setting again
self.eventuallyEqual(lambda: self.query_database(leader.metadata.name, "postgres", setting_query)[0], lower_max_connections_value,
"Previous max_connections setting not applied on master", 10, 5)
self.eventuallyEqual(lambda: self.query_database(replica.metadata.name, "postgres", setting_query)[0], new_max_connections_value,
self.eventuallyEqual(lambda: self.query_database(replica.metadata.name, "postgres", setting_query)[0], lower_max_connections_value,
"Previous max_connections setting not applied on replica", 10, 5)
except timeout_decorator.TimeoutError:

31
pkg/cluster/sync.go
View File

@ -273,7 +273,6 @@ func (c *Cluster) syncPodDisruptionBudget(isUpdate bool) error {
func (c *Cluster) syncStatefulSet() error {
var (
restartTTL uint32
instanceRestartRequired bool
restartMasterFirst bool
)
@ -414,24 +413,24 @@ func (c *Cluster) syncStatefulSet() error {
// empty config probably means cluster is not fully initialized yet, e.g. restoring from backup
// do not attempt a restart
if !reflect.DeepEqual(patroniConfig, emptyPatroniConfig) || len(pgParameters) > 0 {
instanceRestartRequired, restartMasterFirst, err = c.checkAndSetGlobalPostgreSQLConfiguration(&pod, patroniConfig, pgParameters)
restartMasterFirst, err = c.checkAndSetGlobalPostgreSQLConfiguration(&pod, patroniConfig, pgParameters)
if err != nil {
c.logger.Warningf("could not set PostgreSQL configuration options for pod %s: %v", podName, err)
continue
}
// it could take up to LoopWait to apply the config
time.Sleep(time.Duration(patroniConfig.LoopWait)*time.Second + time.Second*2)
restartTTL = patroniConfig.TTL
break
}
}
// if the config update requires a restart, call Patroni restart
if instanceRestartRequired {
// restart instances if requiredy
remainingPods := make([]*v1.Pod, 0)
skipRole := Master
if restartMasterFirst {
skipRole = Replica
}
c.logger.Debug("restarting Postgres server within pods")
for i, pod := range pods {
role := PostgresRole(pod.Labels[c.OpConfig.PodRoleLabel])
if role == skipRole {
@ -453,7 +452,6 @@ func (c *Cluster) syncStatefulSet() error {
}
}
}
}
// if we get here we also need to re-create the pods (either leftovers from the old
// statefulset or those that got their configuration from the outdated statefulset)
@ -472,16 +470,23 @@ func (c *Cluster) restartInstance(pod *v1.Pod) {
podName := util.NameFromMeta(pod.ObjectMeta)
role := PostgresRole(pod.Labels[c.OpConfig.PodRoleLabel])
c.eventRecorder.Event(c.GetReference(), v1.EventTypeNormal, "Update", fmt.Sprintf("restarting Postgres server within %s pod %s", role, pod.Name))
// if the config update requires a restart, call Patroni restart
memberData, err := c.patroni.GetMemberData(pod)
if err != nil {
c.logger.Debugf("could not get member data of %s pod %s - skipping possible restart attempt: %v", role, podName, err)
return
}
// do restart only when it is pending
if memberData.PendingRestart {
c.eventRecorder.Event(c.GetReference(), v1.EventTypeNormal, "Update", fmt.Sprintf("restarting Postgres server within %s pod %s", role, pod.Name))
if err := c.patroni.Restart(pod); err != nil {
c.logger.Warningf("could not restart Postgres server within %s pod %s: %v", role, podName, err)
return
}
c.logger.Debugf("Postgres server successfuly restarted in %s pod %s", role, podName)
c.eventRecorder.Event(c.GetReference(), v1.EventTypeNormal, "Update", fmt.Sprintf("Postgres server restart done for %s pod %s", role, pod.Name))
}
}
// AnnotationsToPropagate get the annotations to update if required
// based on the annotations in postgres CRD
@ -517,7 +522,7 @@ func (c *Cluster) AnnotationsToPropagate(annotations map[string]string) map[stri
// checkAndSetGlobalPostgreSQLConfiguration checks whether cluster-wide API parameters
// (like max_connections) have changed and if necessary sets it via the Patroni API
func (c *Cluster) checkAndSetGlobalPostgreSQLConfiguration(pod *v1.Pod, patroniConfig acidv1.Patroni, effectivePgParameters map[string]string) (bool, bool, error) {
func (c *Cluster) checkAndSetGlobalPostgreSQLConfiguration(pod *v1.Pod, patroniConfig acidv1.Patroni, effectivePgParameters map[string]string) (bool, error) {
configToSet := make(map[string]interface{})
parametersToSet := make(map[string]string)
restartMaster := make([]bool, 0)
@ -584,7 +589,7 @@ func (c *Cluster) checkAndSetGlobalPostgreSQLConfiguration(pod *v1.Pod, patroniC
}
if len(configToSet) == 0 {
return false, false, nil
return false, nil
}
configToSetJson, err := json.Marshal(configToSet)
@ -598,10 +603,10 @@ func (c *Cluster) checkAndSetGlobalPostgreSQLConfiguration(pod *v1.Pod, patroniC
c.logger.Debugf("patching Postgres config via Patroni API on pod %s with following options: %s",
podName, configToSetJson)
if err = c.patroni.SetConfig(pod, configToSet); err != nil {
return true, requiresMasterRestart, fmt.Errorf("could not patch postgres parameters with a pod %s: %v", podName, err)
return requiresMasterRestart, fmt.Errorf("could not patch postgres parameters with a pod %s: %v", podName, err)
}
return true, requiresMasterRestart, nil
return requiresMasterRestart, nil
}
func (c *Cluster) syncSecrets() error {

8
pkg/util/patroni/patroni.go
View File

@ -238,17 +238,13 @@ func (p *Patroni) Restart(server *v1.Pod) error {
if err != nil {
return err
}
memberData, err := p.GetMemberData(server)
if err != nil {
if err := p.httpPostOrPatch(http.MethodPost, apiURLString+restartPath, buf); err != nil {
return err
}
p.logger.Infof("Postgres server successfuly restarted in pod %s", server.Name)
// do restart only when it is pending
if !memberData.PendingRestart {
return nil
}
return p.httpPostOrPatch(http.MethodPost, apiURLString+restartPath, buf)
}
// GetMemberData read member data from patroni API
func (p *Patroni) GetMemberData(server *v1.Pod) (MemberData, error) {