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Upgrade to Advanced StatefulSet automatically
Signed-off-by: Yecheng Fu <fuyecheng@pingcap.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| // 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 ( | ||
| "fmt" | ||
|
|
||
| "github.com/pingcap/advanced-statefulset/pkg/apis/apps/v1/helper" | ||
| asclientset "github.com/pingcap/advanced-statefulset/pkg/client/clientset/versioned" | ||
| "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/label" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/klog" | ||
| ) | ||
|
|
||
| // 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") | ||
| tcList, err := u.cli.PingcapV1alpha1().TidbClusters(u.ns).List(metav1.ListOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| for _, tc := range tcList.Items { | ||
| // 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) | ||
| } | ||
| } | ||
| stsList, err := u.kubeCli.AppsV1().StatefulSets(u.ns).List(metav1.ListOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if len(stsList.Items) <= 0 { | ||
| klog.Infof("Upgrader: found 0 Kubernetes StatefulSets, nothing need to do") | ||
| return nil | ||
| } | ||
| klog.Infof("Upgrader: found %d Kubernetes StatefulSets, trying to migrate one by one", len(stsList.Items)) | ||
| for _, sts := range stsList.Items { | ||
| _, err := helper.Upgrade(u.kubeCli, u.asCli, &sts) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| klog.Infof("Upgrader: successfully migrated Kubernetes StatefulSet %s/%s", sts.Namespace, sts.Name) | ||
| } | ||
| } else { | ||
| stsList, err := u.asCli.AppsV1().StatefulSets(u.ns).List(metav1.ListOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if len(stsList.Items) <= 0 { | ||
| klog.Infof("Upgrader: found %d Advanced StatefulSets, nothing need to do", len(stsList.Items)) | ||
| 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 in the cluster, the opertor cann't run with AdvancedStatefulSet feature disabled", len(stsList.Items)) | ||
| } | ||
| 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} { | ||
| 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} | ||
| } |
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