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upgrader.go
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upgrader.go
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// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package upgrader
import (
"context"
"fmt"
asappsv1 "github.com/pingcap/advanced-statefulset/client/apis/apps/v1"
"github.com/pingcap/advanced-statefulset/client/apis/apps/v1/helper"
asclientset "github.com/pingcap/advanced-statefulset/client/client/clientset/versioned"
"github.com/pingcap/tidb-operator/pkg/apis/label"
"github.com/pingcap/tidb-operator/pkg/apis/pingcap/v1alpha1"
"github.com/pingcap/tidb-operator/pkg/client/clientset/versioned"
"github.com/pingcap/tidb-operator/pkg/features"
"github.com/pingcap/tidb-operator/pkg/util"
utildiscovery "github.com/pingcap/tidb-operator/pkg/util/discovery"
appsv1 "k8s.io/api/apps/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
)
// Interface represents the interface of upgrader.
type Interface interface {
// Upgrade runs in the boot process and performs the function of upgrade
// for the current operator.
//
// Implemention of this interface must be idempotent. If it fails, the
// program can be restarted to retry again without affecting current
// Kubernetes cluster and TiDB clusters.
//
// Note that it's possible that it cann't finish its job when you're trying
// to upgrade a newer operator to an older one or enable/disable some
// irreversible features.
Upgrade() error
}
type upgrader struct {
kubeCli kubernetes.Interface
cli versioned.Interface
asCli asclientset.Interface
ns string
}
var _ Interface = &upgrader{}
func (u *upgrader) Upgrade() error {
if features.DefaultFeatureGate.Enabled(features.AdvancedStatefulSet) {
klog.Infof("Upgrader: migrating Kubernetes StatefulSets to Advanced StatefulSets")
stsList, err := u.kubeCli.AppsV1().StatefulSets(u.ns).List(context.Background(), metav1.ListOptions{})
if err != nil {
return err
}
stsToMigrate := make([]appsv1.StatefulSet, 0)
tidbClusters := make([]*v1alpha1.TidbCluster, 0)
for i := range stsList.Items {
sts := stsList.Items[i]
if ok, tcRef := util.IsOwnedByTidbCluster(&sts); ok {
stsToMigrate = append(stsToMigrate, sts)
tc, err := u.cli.PingcapV1alpha1().TidbClusters(sts.Namespace).Get(context.Background(), tcRef.Name, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return err
}
if tc != nil {
tidbClusters = append(tidbClusters, tc)
}
}
}
if len(stsToMigrate) <= 0 {
klog.Infof("Upgrader: found 0 Kubernetes StatefulSets owned by TidbCluster, nothing need to do")
return nil
}
klog.Infof("Upgrader: %d Kubernetes Statfulsets owned by TidbCluster should be migrated to Advanced Statefulsets", len(stsToMigrate))
// Check if relavant TidbClusters have delete slots annotations set.
for _, tc := range tidbClusters {
// Existing delete slots annotations must be removed first. This is
// a safety check to ensure no pods are affected in upgrading
// process.
if anns := deleteSlotAnns(tc); len(anns) > 0 {
return fmt.Errorf("Upgrader: TidbCluster %s/%s has delete slot annotations %v, please remove them before enabling AdvancedStatefulSet feature", tc.Namespace, tc.Name, anns)
}
}
klog.Infof("Upgrader: found %d Kubernetes StatefulSets owned by TidbCluster, trying to migrate one by one", len(stsToMigrate))
for i := range stsToMigrate {
sts := stsToMigrate[i]
_, err := helper.Upgrade(context.Background(), u.kubeCli, u.asCli, &sts)
if err != nil {
return err
}
klog.Infof("Upgrader: successfully migrated Kubernetes StatefulSet %s/%s", sts.Namespace, sts.Name)
}
} else {
if isSupported, err := utildiscovery.IsAPIGroupSupported(u.kubeCli.Discovery(), asappsv1.GroupName); err != nil {
return err
} else if !isSupported {
klog.Infof("Upgrader: APIGroup %s is not registered, skip checking Advanced Statfulset", asappsv1.GroupName)
return nil
}
stsList, err := u.asCli.AppsV1().StatefulSets(u.ns).List(context.Background(), metav1.ListOptions{})
if err != nil {
return err
}
stsToMigrate := make([]asappsv1.StatefulSet, 0)
for i := range stsList.Items {
sts := stsList.Items[i]
if ok, _ := util.IsOwnedByTidbCluster(&sts); ok {
stsToMigrate = append(stsToMigrate, sts)
}
}
if len(stsToMigrate) <= 0 {
klog.Infof("Upgrader: found %d Advanced StatefulSets owned by TidbCluster, nothing need to do", len(stsToMigrate))
return nil
}
// The upgrader cannot migrate Advanced StatefulSets to Kubernetes
// StatefulSets automatically right now.
// TODO try our best to allow users to revert AdvancedStatefulSet feature automaticaly
return fmt.Errorf("Upgrader: found %d Advanced StatefulSets owned by TidbCluster, the operator cann't run with AdvancedStatefulSet feature disabled", len(stsToMigrate))
}
return nil
}
func deleteSlotAnns(tc *v1alpha1.TidbCluster) map[string]string {
anns := make(map[string]string)
if tc == nil || tc.Annotations == nil {
return anns
}
for _, key := range []string{label.AnnPDDeleteSlots, label.AnnTiDBDeleteSlots, label.AnnTiKVDeleteSlots, label.AnnTiFlashDeleteSlots} {
if v, ok := tc.Annotations[key]; ok {
anns[key] = v
}
}
return anns
}
func NewUpgrader(kubeCli kubernetes.Interface, cli versioned.Interface, asCli asclientset.Interface, ns string) Interface {
return &upgrader{kubeCli, cli, asCli, ns}
}