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Improve rolling upgrades and rolling upgrade continue (#1341) 

* add TODOs for moving rooling update label on pods
* steer rolling update via pod annotation
* rename patch method and fix reading flag on sync
* pass only pods to recreatePods function
* do not take address of iterator if you use it later
* add e2e test and pass switchover targets to recreatePods
* add wait_for_pod_failover for e2e test
* add one more e2e test case
* helm chart remove 1.6.0 archive from 1.6.0 archive
* reflect code review feedback
This commit is contained in:
Felix Kunde 2021-02-26 15:38:58 +01:00 committed by GitHub
parent e837751ae0
commit ff8143770c
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 330 additions and 169 deletions
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2
e2e/scripts/watch_objects.sh
View File

@ -4,7 +4,7 @@ watch -c "
kubectl get postgresql --all-namespaces
echo
echo -n 'Rolling upgrade pending: '
kubectl get statefulset -o jsonpath='{.items..metadata.annotations.zalando-postgres-operator-rolling-update-required}'
kubectl get pods -o jsonpath='{.items[].metadata.annotations.zalando-postgres-operator-rolling-update-required}'
echo
echo
echo 'Pods'

22
e2e/tests/k8s_api.py
View File

@ -211,7 +211,7 @@ class K8s:
self.wait_for_logical_backup_job(expected_num_of_jobs=1)
def delete_operator_pod(self, step="Delete operator pod"):
# patching the pod template in the deployment restarts the operator pod
# patching the pod template in the deployment restarts the operator pod
self.api.apps_v1.patch_namespaced_deployment("postgres-operator", "default", {"spec": {"template": {"metadata": {"annotations": {"step": "{}-{}".format(step, time.time())}}}}})
self.wait_for_operator_pod_start()
@ -219,8 +219,8 @@ class K8s:
self.api.core_v1.patch_namespaced_config_map("postgres-operator", "default", config_map_patch)
self.delete_operator_pod(step=step)
def patch_statefulset(self, data, name="acid-minimal-cluster", namespace="default"):
self.api.apps_v1.patch_namespaced_stateful_set(name, namespace, data)
def patch_pod(self, data, pod_name, namespace="default"):
self.api.core_v1.patch_namespaced_pod(pod_name, namespace, data)
def create_with_kubectl(self, path):
return subprocess.run(
@ -280,19 +280,21 @@ class K8s:
return None
return pod.items[0].spec.containers[0].image
def get_cluster_leader_pod(self, pg_cluster_name, namespace='default'):
labels = {
'application': 'spilo',
'cluster-name': pg_cluster_name,
'spilo-role': 'master',
}
def get_cluster_pod(self, role, labels='application=spilo,cluster-name=acid-minimal-cluster', namespace='default'):
labels = labels + ',spilo-role=' + role
pods = self.api.core_v1.list_namespaced_pod(
namespace, label_selector=to_selector(labels)).items
namespace, label_selector=labels).items
if pods:
return pods[0]
def get_cluster_leader_pod(self, labels='application=spilo,cluster-name=acid-minimal-cluster', namespace='default'):
return self.get_cluster_pod('master', labels, namespace)
def get_cluster_replica_pod(self, labels='application=spilo,cluster-name=acid-minimal-cluster', namespace='default'):
return self.get_cluster_pod('replica', labels, namespace)
class K8sBase:
'''

170
e2e/tests/test_e2e.py
View File

@ -168,12 +168,25 @@ class EndToEndTestCase(unittest.TestCase):
"additional_pod_capabilities": ','.join(capabilities),
},
}
self.k8s.update_config(patch_capabilities)
self.eventuallyEqual(lambda: self.k8s.get_operator_state(), {"0": "idle"},
"Operator does not get in sync")
self.eventuallyEqual(lambda: self.k8s.count_pods_with_container_capabilities(capabilities, cluster_label),
2, "Container capabilities not updated")
# get node and replica (expected target of new master)
_, replica_nodes = self.k8s.get_pg_nodes(cluster_label)
try:
self.k8s.update_config(patch_capabilities)
self.eventuallyEqual(lambda: self.k8s.get_operator_state(), {"0": "idle"},
"Operator does not get in sync")
# changed security context of postrges container should trigger a rolling update
self.k8s.wait_for_pod_failover(replica_nodes, 'spilo-role=master,' + cluster_label)
self.k8s.wait_for_pod_start('spilo-role=replica,' + cluster_label)
self.eventuallyEqual(lambda: self.k8s.count_pods_with_container_capabilities(capabilities, cluster_label),
2, "Container capabilities not updated")
except timeout_decorator.TimeoutError:
print('Operator log: {}'.format(k8s.get_operator_log()))
raise
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_additional_teams_and_members(self):
@ -212,7 +225,7 @@ class EndToEndTestCase(unittest.TestCase):
# make sure we let one sync pass and the new user being added
time.sleep(15)
leader = self.k8s.get_cluster_leader_pod('acid-minimal-cluster')
leader = self.k8s.get_cluster_leader_pod()
user_query = """
SELECT usename
FROM pg_catalog.pg_user
@ -392,7 +405,7 @@ class EndToEndTestCase(unittest.TestCase):
# credentials.
db_list = []
leader = k8s.get_cluster_leader_pod('acid-minimal-cluster')
leader = k8s.get_cluster_leader_pod()
schemas_query = """
select schema_name
from information_schema.schemata
@ -611,7 +624,7 @@ class EndToEndTestCase(unittest.TestCase):
k8s.update_config(unpatch_lazy_spilo_upgrade, step="patch lazy upgrade")
# at this point operator will complete the normal rolling upgrade
# so we additonally test if disabling the lazy upgrade - forcing the normal rolling upgrade - works
# so we additionally test if disabling the lazy upgrade - forcing the normal rolling upgrade - works
self.eventuallyEqual(lambda: k8s.get_effective_pod_image(pod0),
conf_image, "Rolling upgrade was not executed",
50, 3)
@ -750,12 +763,6 @@ class EndToEndTestCase(unittest.TestCase):
self.eventuallyTrue(verify_pod_limits, "Pod limits where not adjusted")
@classmethod
def setUp(cls):
# cls.k8s.update_config({}, step="Setup")
cls.k8s.patch_statefulset({"meta": {"annotations": {"zalando-postgres-operator-rolling-update-required": False}}})
pass
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_multi_namespace_support(self):
'''
@ -784,6 +791,139 @@ class EndToEndTestCase(unittest.TestCase):
"acid.zalan.do", "v1", self.test_namespace, "postgresqls", "acid-test-cluster")
time.sleep(5)
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_rolling_update_flag(self):
'''
Add rolling update flag to only the master and see it failing over
'''
k8s = self.k8s
cluster_label = 'application=spilo,cluster-name=acid-minimal-cluster'
# verify we are in good state from potential previous tests
self.eventuallyEqual(lambda: k8s.count_running_pods(), 2, "No 2 pods running")
# get node and replica (expected target of new master)
_, replica_nodes = k8s.get_pg_nodes(cluster_label)
# rolling update annotation
flag = {
"metadata": {
"annotations": {
"zalando-postgres-operator-rolling-update-required": "true",
}
}
}
try:
podsList = k8s.api.core_v1.list_namespaced_pod('default', label_selector=cluster_label)
for pod in podsList.items:
# add flag only to the master to make it appear to the operator as a leftover from a rolling update
if pod.metadata.labels.get('spilo-role') == 'master':
old_creation_timestamp = pod.metadata.creation_timestamp
k8s.patch_pod(flag, pod.metadata.name, pod.metadata.namespace)
else:
# remember replica name to check if operator does a switchover
switchover_target = pod.metadata.name
# do not wait until the next sync
k8s.delete_operator_pod()
# operator should now recreate the master pod and do a switchover before
k8s.wait_for_pod_failover(replica_nodes, 'spilo-role=master,' + cluster_label)
# check if the former replica is now the new master
leader = k8s.get_cluster_leader_pod()
self.eventuallyEqual(lambda: leader.metadata.name, switchover_target, "Rolling update flag did not trigger switchover")
# check that the old master has been recreated
k8s.wait_for_pod_start('spilo-role=replica,' + cluster_label)
replica = k8s.get_cluster_replica_pod()
self.assertTrue(replica.metadata.creation_timestamp > old_creation_timestamp, "Old master pod was not recreated")
except timeout_decorator.TimeoutError:
print('Operator log: {}'.format(k8s.get_operator_log()))
raise
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_rolling_update_label_timeout(self):
'''
Simulate case when replica does not receive label in time and rolling update does not finish
'''
k8s = self.k8s
cluster_label = 'application=spilo,cluster-name=acid-minimal-cluster'
flag = "zalando-postgres-operator-rolling-update-required"
# verify we are in good state from potential previous tests
self.eventuallyEqual(lambda: k8s.count_running_pods(), 2, "No 2 pods running")
# get node and replica (expected target of new master)
_, replica_nodes = k8s.get_pg_nodes(cluster_label)
# rolling update annotation
rolling_update_patch = {
"metadata": {
"annotations": {
flag: "true",
}
}
}
# make pod_label_wait_timeout so short that rolling update fails on first try
# temporarily lower resync interval to reduce waiting for further tests
# pods should get healthy in the meantime
patch_resync_config = {
"data": {
"pod_label_wait_timeout": "2s",
"resync_period": "20s",
}
}
try:
# patch both pods for rolling update
podList = k8s.api.core_v1.list_namespaced_pod('default', label_selector=cluster_label)
for pod in podList.items:
k8s.patch_pod(rolling_update_patch, pod.metadata.name, pod.metadata.namespace)
if pod.metadata.labels.get('spilo-role') == 'replica':
switchover_target = pod.metadata.name
# update config and restart operator
k8s.update_config(patch_resync_config, "update resync interval and pod_label_wait_timeout")
# operator should now recreate the replica pod first and do a switchover after
k8s.wait_for_pod_start('spilo-role=replica,' + cluster_label)
# pod_label_wait_timeout should have been exceeded hence the rolling update is continued on next sync
# check if the cluster state is "SyncFailed"
self.eventuallyEqual(lambda: k8s.pg_get_status(), "SyncFailed", "Expected SYNC event to fail")
# wait for next sync, replica should be running normally by now and be ready for switchover
k8s.wait_for_pod_failover(replica_nodes, 'spilo-role=master,' + cluster_label)
# check if the former replica is now the new master
leader = k8s.get_cluster_leader_pod()
self.eventuallyEqual(lambda: leader.metadata.name, switchover_target, "Rolling update flag did not trigger switchover")
# wait for the old master to get restarted
k8s.wait_for_pod_start('spilo-role=replica,' + cluster_label)
# status should again be "SyncFailed" but turn into "Running" on the next sync
time.sleep(10)
self.eventuallyEqual(lambda: k8s.pg_get_status(), "Running", "Expected running cluster after two syncs")
# revert config changes
patch_resync_config = {
"data": {
"pod_label_wait_timeout": "10m",
"resync_period": "30m",
}
}
k8s.update_config(patch_resync_config, "revert resync interval and pod_label_wait_timeout")
except timeout_decorator.TimeoutError:
print('Operator log: {}'.format(k8s.get_operator_log()))
raise
@timeout_decorator.timeout(TEST_TIMEOUT_SEC)
def test_zz_node_readiness_label(self):

2
pkg/cluster/cluster.go
View File

@ -1309,7 +1309,7 @@ func (c *Cluster) Switchover(curMaster *v1.Pod, candidate spec.NamespacedName) e
err = fmt.Errorf("could not get master pod label: %v", err)
}
} else {
err = fmt.Errorf("could not switch over: %v", err)
err = fmt.Errorf("could not switch over from %q to %q: %v", curMaster.Name, candidate, err)
}
// signal the role label waiting goroutine to close the shop and go home

2
pkg/cluster/k8sres.go
View File

@ -6,7 +6,6 @@ import (
"fmt"
"path"
"sort"
"strconv"
"strings"
"github.com/sirupsen/logrus"
@ -1279,7 +1278,6 @@ func (c *Cluster) generateStatefulSet(spec *acidv1.PostgresSpec) (*appsv1.Statef
}
stsAnnotations := make(map[string]string)
stsAnnotations[rollingUpdateStatefulsetAnnotationKey] = strconv.FormatBool(false)
stsAnnotations = c.AnnotationsToPropagate(c.annotationsSet(nil))
statefulSet := &appsv1.StatefulSet{

120
pkg/cluster/pod.go
View File

@ -4,11 +4,13 @@ import (
"context"
"fmt"
"math/rand"
"strconv"
"time"
appsv1 "k8s.io/api/apps/v1"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"github.com/zalando/postgres-operator/pkg/spec"
"github.com/zalando/postgres-operator/pkg/util"
@ -46,6 +48,64 @@ func (c *Cluster) getRolePods(role PostgresRole) ([]v1.Pod, error) {
return pods.Items, nil
}
// markRollingUpdateFlagForPod sets the indicator for the rolling update requirement
// in the Pod annotation.
func (c *Cluster) markRollingUpdateFlagForPod(pod *v1.Pod, msg string) error {
// no need to patch pod if annotation is already there
if c.getRollingUpdateFlagFromPod(pod) {
return nil
}
c.logger.Debugf("mark rolling update annotation for %s: reason %s", pod.Name, msg)
flag := make(map[string]string)
flag[rollingUpdatePodAnnotationKey] = strconv.FormatBool(true)
patchData, err := metaAnnotationsPatch(flag)
if err != nil {
return fmt.Errorf("could not form patch for pod's rolling update flag: %v", err)
}
err = retryutil.Retry(1*time.Second, 5*time.Second,
func() (bool, error) {
_, err2 := c.KubeClient.Pods(pod.Namespace).Patch(
context.TODO(),
pod.Name,
types.MergePatchType,
[]byte(patchData),
metav1.PatchOptions{},
"")
if err2 != nil {
return false, err2
}
return true, nil
})
if err != nil {
return fmt.Errorf("could not patch pod rolling update flag %q: %v", patchData, err)
}
return nil
}
// getRollingUpdateFlagFromPod returns the value of the rollingUpdate flag from the given pod
func (c *Cluster) getRollingUpdateFlagFromPod(pod *v1.Pod) (flag bool) {
anno := pod.GetAnnotations()
flag = false
stringFlag, exists := anno[rollingUpdatePodAnnotationKey]
if exists {
var err error
c.logger.Debugf("found rolling update flag on pod %q", pod.Name)
if flag, err = strconv.ParseBool(stringFlag); err != nil {
c.logger.Warnf("error when parsing %q annotation for the pod %q: expected boolean value, got %q\n",
rollingUpdatePodAnnotationKey,
types.NamespacedName{Namespace: pod.Namespace, Name: pod.Name},
stringFlag)
}
}
return flag
}
func (c *Cluster) deletePods() error {
c.logger.Debugln("deleting pods")
pods, err := c.listPods()
@ -282,7 +342,18 @@ func (c *Cluster) recreatePod(podName spec.NamespacedName) (*v1.Pod, error) {
defer c.unregisterPodSubscriber(podName)
stopChan := make(chan struct{})
if err := c.KubeClient.Pods(podName.Namespace).Delete(context.TODO(), podName.Name, c.deleteOptions); err != nil {
err := retryutil.Retry(1*time.Second, 5*time.Second,
func() (bool, error) {
err2 := c.KubeClient.Pods(podName.Namespace).Delete(
context.TODO(),
podName.Name,
c.deleteOptions)
if err2 != nil {
return false, err2
}
return true, nil
})
if err != nil {
return nil, fmt.Errorf("could not delete pod: %v", err)
}
@ -297,7 +368,7 @@ func (c *Cluster) recreatePod(podName spec.NamespacedName) (*v1.Pod, error) {
return pod, nil
}
func (c *Cluster) isSafeToRecreatePods(pods *v1.PodList) bool {
func (c *Cluster) isSafeToRecreatePods(pods []v1.Pod) bool {
/*
Operator should not re-create pods if there is at least one replica being bootstrapped
@ -306,20 +377,17 @@ func (c *Cluster) isSafeToRecreatePods(pods *v1.PodList) bool {
XXX operator cannot forbid replica re-init, so we might still fail if re-init is started
after this check succeeds but before a pod is re-created
*/
for _, pod := range pods.Items {
for _, pod := range pods {
c.logger.Debugf("name=%s phase=%s ip=%s", pod.Name, pod.Status.Phase, pod.Status.PodIP)
}
for _, pod := range pods.Items {
for _, pod := range pods {
var data patroni.MemberData
err := retryutil.Retry(1*time.Second, 5*time.Second,
func() (bool, error) {
var err error
data, err = c.patroni.GetMemberData(&pod)
if err != nil {
@ -336,47 +404,39 @@ func (c *Cluster) isSafeToRecreatePods(pods *v1.PodList) bool {
c.logger.Warningf("cannot re-create replica %s: it is currently being initialized", pod.Name)
return false
}
}
return true
}
func (c *Cluster) recreatePods() error {
func (c *Cluster) recreatePods(pods []v1.Pod, switchoverCandidates []spec.NamespacedName) error {
c.setProcessName("starting to recreate pods")
ls := c.labelsSet(false)
namespace := c.Namespace
listOptions := metav1.ListOptions{
LabelSelector: ls.String(),
}
pods, err := c.KubeClient.Pods(namespace).List(context.TODO(), listOptions)
if err != nil {
return fmt.Errorf("could not get the list of pods: %v", err)
}
c.logger.Infof("there are %d pods in the cluster to recreate", len(pods.Items))
c.logger.Infof("there are %d pods in the cluster to recreate", len(pods))
if !c.isSafeToRecreatePods(pods) {
return fmt.Errorf("postpone pod recreation until next Sync: recreation is unsafe because pods are being initialized")
}
var (
masterPod, newMasterPod, newPod *v1.Pod
masterPod, newMasterPod *v1.Pod
)
replicas := make([]spec.NamespacedName, 0)
for i, pod := range pods.Items {
replicas := switchoverCandidates
for i, pod := range pods {
role := PostgresRole(pod.Labels[c.OpConfig.PodRoleLabel])
if role == Master {
masterPod = &pods.Items[i]
masterPod = &pods[i]
continue
}
podName := util.NameFromMeta(pods.Items[i].ObjectMeta)
if newPod, err = c.recreatePod(podName); err != nil {
podName := util.NameFromMeta(pod.ObjectMeta)
newPod, err := c.recreatePod(podName)
if err != nil {
return fmt.Errorf("could not recreate replica pod %q: %v", util.NameFromMeta(pod.ObjectMeta), err)
}
if newRole := PostgresRole(newPod.Labels[c.OpConfig.PodRoleLabel]); newRole == Replica {
newRole := PostgresRole(newPod.Labels[c.OpConfig.PodRoleLabel])
if newRole == Replica {
replicas = append(replicas, util.NameFromMeta(pod.ObjectMeta))
} else if newRole == Master {
newMasterPod = newPod
@ -384,7 +444,9 @@ func (c *Cluster) recreatePods() error {
}
if masterPod != nil {
// failover if we have not observed a master pod when re-creating former replicas.
// switchover if
// 1. we have not observed a new master pod when re-creating former replicas
// 2. we know possible switchover targets even when no replicas were recreated
if newMasterPod == nil && len(replicas) > 0 {
if err := c.Switchover(masterPod, masterCandidate(replicas)); err != nil {
c.logger.Warningf("could not perform switch over: %v", err)

77
pkg/cluster/resources.go
View File

@ -19,7 +19,7 @@ import (
)
const (
rollingUpdateStatefulsetAnnotationKey = "zalando-postgres-operator-rolling-update-required"
rollingUpdatePodAnnotationKey = "zalando-postgres-operator-rolling-update-required"
)
func (c *Cluster) listResources() error {
@ -147,79 +147,6 @@ func (c *Cluster) preScaleDown(newStatefulSet *appsv1.StatefulSet) error {
return nil
}
// setRollingUpdateFlagForStatefulSet sets the indicator or the rolling update requirement
// in the StatefulSet annotation.
func (c *Cluster) setRollingUpdateFlagForStatefulSet(sset *appsv1.StatefulSet, val bool, msg string) {
anno := sset.GetAnnotations()
if anno == nil {
anno = make(map[string]string)
}
anno[rollingUpdateStatefulsetAnnotationKey] = strconv.FormatBool(val)
sset.SetAnnotations(anno)
c.logger.Debugf("set statefulset's rolling update annotation to %t: caller/reason %s", val, msg)
}
// applyRollingUpdateFlagforStatefulSet sets the rolling update flag for the cluster's StatefulSet
// and applies that setting to the actual running cluster.
func (c *Cluster) applyRollingUpdateFlagforStatefulSet(val bool) error {
c.setRollingUpdateFlagForStatefulSet(c.Statefulset, val, "applyRollingUpdateFlag")
sset, err := c.updateStatefulSetAnnotations(c.Statefulset.GetAnnotations())
if err != nil {
return err
}
c.Statefulset = sset
return nil
}
// getRollingUpdateFlagFromStatefulSet returns the value of the rollingUpdate flag from the passed
// StatefulSet, reverting to the default value in case of errors
func (c *Cluster) getRollingUpdateFlagFromStatefulSet(sset *appsv1.StatefulSet, defaultValue bool) (flag bool) {
anno := sset.GetAnnotations()
flag = defaultValue
stringFlag, exists := anno[rollingUpdateStatefulsetAnnotationKey]
if exists {
var err error
if flag, err = strconv.ParseBool(stringFlag); err != nil {
c.logger.Warnf("error when parsing %q annotation for the statefulset %q: expected boolean value, got %q\n",
rollingUpdateStatefulsetAnnotationKey,
types.NamespacedName{Namespace: sset.Namespace, Name: sset.Name},
stringFlag)
flag = defaultValue
}
}
return flag
}
// mergeRollingUpdateFlagUsingCache returns the value of the rollingUpdate flag from the passed
// statefulset, however, the value can be cleared if there is a cached flag in the cluster that
// is set to false (the discrepancy could be a result of a failed StatefulSet update)
func (c *Cluster) mergeRollingUpdateFlagUsingCache(runningStatefulSet *appsv1.StatefulSet) bool {
var (
cachedStatefulsetExists, clearRollingUpdateFromCache, podsRollingUpdateRequired bool
)
if c.Statefulset != nil {
// if we reset the rolling update flag in the statefulset structure in memory but didn't manage to update
// the actual object in Kubernetes for some reason we want to avoid doing an unnecessary update by relying
// on the 'cached' in-memory flag.
cachedStatefulsetExists = true
clearRollingUpdateFromCache = !c.getRollingUpdateFlagFromStatefulSet(c.Statefulset, true)
c.logger.Debugf("cached StatefulSet value exists, rollingUpdate flag is %t", clearRollingUpdateFromCache)
}
if podsRollingUpdateRequired = c.getRollingUpdateFlagFromStatefulSet(runningStatefulSet, false); podsRollingUpdateRequired {
if cachedStatefulsetExists && clearRollingUpdateFromCache {
c.logger.Infof("clearing the rolling update flag based on the cached information")
podsRollingUpdateRequired = false
} else {
c.logger.Infof("found a statefulset with an unfinished rolling update of the pods")
}
}
return podsRollingUpdateRequired
}
func (c *Cluster) updateStatefulSetAnnotations(annotations map[string]string) (*appsv1.StatefulSet, error) {
c.logger.Debugf("patching statefulset annotations")
patchData, err := metaAnnotationsPatch(annotations)
@ -237,8 +164,8 @@ func (c *Cluster) updateStatefulSetAnnotations(annotations map[string]string) (*
return nil, fmt.Errorf("could not patch statefulset annotations %q: %v", patchData, err)
}
return result, nil
}
func (c *Cluster) updateStatefulSet(newStatefulSet *appsv1.StatefulSet) error {
c.setProcessName("updating statefulset")
if c.Statefulset == nil {

104
pkg/cluster/sync.go
View File

@ -283,22 +283,24 @@ func (c *Cluster) mustUpdatePodsAfterLazyUpdate(desiredSset *appsv1.StatefulSet)
}
func (c *Cluster) syncStatefulSet() error {
var (
podsRollingUpdateRequired bool
)
podsToRecreate := make([]v1.Pod, 0)
switchoverCandidates := make([]spec.NamespacedName, 0)
pods, err := c.listPods()
if err != nil {
c.logger.Infof("could not list pods of the statefulset: %v", err)
}
// NB: Be careful to consider the codepath that acts on podsRollingUpdateRequired before returning early.
sset, err := c.KubeClient.StatefulSets(c.Namespace).Get(context.TODO(), c.statefulSetName(), metav1.GetOptions{})
if err != nil {
if !k8sutil.ResourceNotFound(err) {
return fmt.Errorf("could not get statefulset: %v", err)
return fmt.Errorf("error during reading of statefulset: %v", err)
}
// statefulset does not exist, try to re-create it
c.Statefulset = nil
c.logger.Infof("could not find the cluster's statefulset")
pods, err := c.listPods()
if err != nil {
return fmt.Errorf("could not list pods of the statefulset: %v", err)
}
c.logger.Infof("cluster's statefulset does not exist")
sset, err = c.createStatefulSet()
if err != nil {
@ -309,41 +311,63 @@ func (c *Cluster) syncStatefulSet() error {
return fmt.Errorf("cluster is not ready: %v", err)
}
podsRollingUpdateRequired = (len(pods) > 0)
if podsRollingUpdateRequired {
c.logger.Warningf("found pods from the previous statefulset: trigger rolling update")
if err := c.applyRollingUpdateFlagforStatefulSet(podsRollingUpdateRequired); err != nil {
return fmt.Errorf("could not set rolling update flag for the statefulset: %v", err)
if len(pods) > 0 {
for _, pod := range pods {
if err = c.markRollingUpdateFlagForPod(&pod, "pod from previous statefulset"); err != nil {
c.logger.Warnf("marking old pod for rolling update failed: %v", err)
}
podsToRecreate = append(podsToRecreate, pod)
}
}
c.logger.Infof("created missing statefulset %q", util.NameFromMeta(sset.ObjectMeta))
} else {
podsRollingUpdateRequired = c.mergeRollingUpdateFlagUsingCache(sset)
// check if there are still pods with a rolling update flag
for _, pod := range pods {
if c.getRollingUpdateFlagFromPod(&pod) {
podsToRecreate = append(podsToRecreate, pod)
} else {
role := PostgresRole(pod.Labels[c.OpConfig.PodRoleLabel])
if role == Master {
continue
}
switchoverCandidates = append(switchoverCandidates, util.NameFromMeta(pod.ObjectMeta))
}
}
if len(podsToRecreate) > 0 {
c.logger.Debugf("%d / %d pod(s) still need to be rotated", len(podsToRecreate), len(pods))
}
// statefulset is already there, make sure we use its definition in order to compare with the spec.
c.Statefulset = sset
desiredSS, err := c.generateStatefulSet(&c.Spec)
desiredSts, err := c.generateStatefulSet(&c.Spec)
if err != nil {
return fmt.Errorf("could not generate statefulset: %v", err)
}
c.setRollingUpdateFlagForStatefulSet(desiredSS, podsRollingUpdateRequired, "from cache")
cmp := c.compareStatefulSetWith(desiredSS)
cmp := c.compareStatefulSetWith(desiredSts)
if !cmp.match {
if cmp.rollingUpdate && !podsRollingUpdateRequired {
podsRollingUpdateRequired = true
c.setRollingUpdateFlagForStatefulSet(desiredSS, podsRollingUpdateRequired, "statefulset changes")
if cmp.rollingUpdate {
podsToRecreate = make([]v1.Pod, 0)
switchoverCandidates = make([]spec.NamespacedName, 0)
for _, pod := range pods {
if err = c.markRollingUpdateFlagForPod(&pod, "pod changes"); err != nil {
return fmt.Errorf("updating rolling update flag for pod failed: %v", err)
}
podsToRecreate = append(podsToRecreate, pod)
}
}
c.logStatefulSetChanges(c.Statefulset, desiredSS, false, cmp.reasons)
c.logStatefulSetChanges(c.Statefulset, desiredSts, false, cmp.reasons)
if !cmp.replace {
if err := c.updateStatefulSet(desiredSS); err != nil {
if err := c.updateStatefulSet(desiredSts); err != nil {
return fmt.Errorf("could not update statefulset: %v", err)
}
} else {
if err := c.replaceStatefulSet(desiredSS); err != nil {
if err := c.replaceStatefulSet(desiredSts); err != nil {
return fmt.Errorf("could not replace statefulset: %v", err)
}
}
@ -351,18 +375,30 @@ func (c *Cluster) syncStatefulSet() error {
c.updateStatefulSetAnnotations(c.AnnotationsToPropagate(c.annotationsSet(c.Statefulset.Annotations)))
if !podsRollingUpdateRequired && !c.OpConfig.EnableLazySpiloUpgrade {
// even if desired and actual statefulsets match
if len(podsToRecreate) == 0 && !c.OpConfig.EnableLazySpiloUpgrade {
// even if the desired and the running statefulsets match
// there still may be not up-to-date pods on condition
// (a) the lazy update was just disabled
// and
// (b) some of the pods were not restarted when the lazy update was still in place
podsRollingUpdateRequired, err = c.mustUpdatePodsAfterLazyUpdate(desiredSS)
if err != nil {
return fmt.Errorf("could not list pods of the statefulset: %v", err)
for _, pod := range pods {
effectivePodImage := pod.Spec.Containers[0].Image
stsImage := desiredSts.Spec.Template.Spec.Containers[0].Image
if stsImage != effectivePodImage {
if err = c.markRollingUpdateFlagForPod(&pod, "pod not yet restarted due to lazy update"); err != nil {
c.logger.Warnf("updating rolling update flag failed for pod %q: %v", pod.Name, err)
}
podsToRecreate = append(podsToRecreate, pod)
} else {
role := PostgresRole(pod.Labels[c.OpConfig.PodRoleLabel])
if role == Master {
continue
}
switchoverCandidates = append(switchoverCandidates, util.NameFromMeta(pod.ObjectMeta))
}
}
}
}
// Apply special PostgreSQL parameters that can only be set via the Patroni API.
@ -374,17 +410,13 @@ 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)
if podsRollingUpdateRequired {
if len(podsToRecreate) > 0 {
c.logger.Debugln("performing rolling update")
c.eventRecorder.Event(c.GetReference(), v1.EventTypeNormal, "Update", "Performing rolling update")
if err := c.recreatePods(); err != nil {
if err := c.recreatePods(podsToRecreate, switchoverCandidates); err != nil {
return fmt.Errorf("could not recreate pods: %v", err)
}
c.logger.Infof("pods have been recreated")
c.eventRecorder.Event(c.GetReference(), v1.EventTypeNormal, "Update", "Rolling update done - pods have been recreated")
if err := c.applyRollingUpdateFlagforStatefulSet(false); err != nil {
c.logger.Warningf("could not clear rolling update for the statefulset: %v", err)
}
}
return nil
}