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tikv_upgrader.go
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tikv_upgrader.go
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// Copyright 2018 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 member
import (
"fmt"
"strconv"
"time"
"github.com/golang/glog"
"github.com/pingcap/tidb-operator/pkg/apis/pingcap.com/v1alpha1"
"github.com/pingcap/tidb-operator/pkg/controller"
"github.com/pingcap/tidb-operator/pkg/pdapi"
apps "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
corelisters "k8s.io/client-go/listers/core/v1"
)
const (
// EvictLeaderBeginTime is the key of evict Leader begin time
EvictLeaderBeginTime = "evictLeaderBeginTime"
// EvictLeaderTimeout is the timeout limit of evict leader
EvictLeaderTimeout = 3 * time.Minute
)
type tikvUpgrader struct {
pdControl pdapi.PDControlInterface
podControl controller.PodControlInterface
podLister corelisters.PodLister
}
// NewTiKVUpgrader returns a tikv Upgrader
func NewTiKVUpgrader(pdControl pdapi.PDControlInterface,
podControl controller.PodControlInterface,
podLister corelisters.PodLister) Upgrader {
return &tikvUpgrader{
pdControl: pdControl,
podControl: podControl,
podLister: podLister,
}
}
func (tku *tikvUpgrader) Upgrade(tc *v1alpha1.TidbCluster, oldSet *apps.StatefulSet, newSet *apps.StatefulSet) error {
ns := tc.GetNamespace()
tcName := tc.GetName()
if tc.Status.PD.Phase == v1alpha1.UpgradePhase {
_, podSpec, err := GetLastAppliedConfig(oldSet)
if err != nil {
return err
}
newSet.Spec.Template.Spec = *podSpec
return nil
}
if !tc.Status.TiKV.Synced {
return fmt.Errorf("Tidbcluster: [%s/%s]'s tikv status sync failed, can not to be upgraded", ns, tcName)
}
tc.Status.TiKV.Phase = v1alpha1.UpgradePhase
if !templateEqual(newSet.Spec.Template, oldSet.Spec.Template) {
return nil
}
if tc.Status.TiKV.StatefulSet.UpdateRevision == tc.Status.TiKV.StatefulSet.CurrentRevision {
return nil
}
if oldSet.Spec.UpdateStrategy.Type == apps.OnDeleteStatefulSetStrategyType || oldSet.Spec.UpdateStrategy.RollingUpdate == nil {
// Manually bypass tidb-operator to modify statefulset directly, such as modify tikv statefulset's RollingUpdate strategy to OnDelete strategy,
// or set RollingUpdate to nil, skip tidb-operator's rolling update logic in order to speed up the upgrade in the test environment occasionally.
// If we encounter this situation, we will let the native statefulset controller do the upgrade completely, which may be unsafe for upgrading tikv.
// Therefore, in the production environment, we should try to avoid modifying the tikv statefulset update strategy directly.
newSet.Spec.UpdateStrategy = oldSet.Spec.UpdateStrategy
glog.Warningf("tidbcluster: [%s/%s] tikv statefulset %s UpdateStrategy has been modified manually", ns, tcName, oldSet.GetName())
return nil
}
setUpgradePartition(newSet, *oldSet.Spec.UpdateStrategy.RollingUpdate.Partition)
for i := tc.Status.TiKV.StatefulSet.Replicas - 1; i >= 0; i-- {
store := tku.getStoreByOrdinal(tc, i)
if store == nil {
continue
}
podName := tikvPodName(tcName, i)
pod, err := tku.podLister.Pods(ns).Get(podName)
if err != nil {
return err
}
revision, exist := pod.Labels[apps.ControllerRevisionHashLabelKey]
if !exist {
return controller.RequeueErrorf("tidbcluster: [%s/%s]'s tikv pod: [%s] has no label: %s", ns, tcName, podName, apps.ControllerRevisionHashLabelKey)
}
if revision == tc.Status.TiKV.StatefulSet.UpdateRevision {
if pod.Status.Phase != corev1.PodRunning {
return controller.RequeueErrorf("tidbcluster: [%s/%s]'s upgraded tikv pod: [%s] is not running", ns, tcName, podName)
}
if store.State != v1alpha1.TiKVStateUp {
return controller.RequeueErrorf("tidbcluster: [%s/%s]'s upgraded tikv pod: [%s] is not all ready", ns, tcName, podName)
}
continue
}
return tku.upgradeTiKVPod(tc, i, newSet)
}
return nil
}
func (tku *tikvUpgrader) upgradeTiKVPod(tc *v1alpha1.TidbCluster, ordinal int32, newSet *apps.StatefulSet) error {
ns := tc.GetNamespace()
tcName := tc.GetName()
upgradePodName := tikvPodName(tcName, ordinal)
upgradePod, err := tku.podLister.Pods(ns).Get(upgradePodName)
if err != nil {
return err
}
for _, store := range tc.Status.TiKV.Stores {
if store.PodName == upgradePodName {
storeID, err := strconv.ParseUint(store.ID, 10, 64)
if err != nil {
return err
}
_, evicting := upgradePod.Annotations[EvictLeaderBeginTime]
if !evicting {
return tku.beginEvictLeader(tc, storeID, upgradePod)
}
if tku.readyToUpgrade(upgradePod, store) {
err := tku.endEvictLeader(tc, ordinal)
if err != nil {
return err
}
setUpgradePartition(newSet, ordinal)
return nil
}
return controller.RequeueErrorf("tidbcluster: [%s/%s]'s tikv pod: [%s] is evicting leader", ns, tcName, upgradePodName)
}
}
return controller.RequeueErrorf("tidbcluster: [%s/%s] no store status found for tikv pod: [%s]", ns, tcName, upgradePodName)
}
func (tku *tikvUpgrader) readyToUpgrade(upgradePod *corev1.Pod, store v1alpha1.TiKVStore) bool {
if store.LeaderCount == 0 {
return true
}
if evictLeaderBeginTimeStr, evicting := upgradePod.Annotations[EvictLeaderBeginTime]; evicting {
evictLeaderBeginTime, err := time.Parse(time.RFC3339, evictLeaderBeginTimeStr)
if err != nil {
glog.Errorf("parse annotation:[%s] to time failed.", EvictLeaderBeginTime)
return false
}
if time.Now().After(evictLeaderBeginTime.Add(EvictLeaderTimeout)) {
return true
}
}
return false
}
func (tku *tikvUpgrader) beginEvictLeader(tc *v1alpha1.TidbCluster, storeID uint64, pod *corev1.Pod) error {
ns := tc.GetNamespace()
podName := pod.GetName()
err := controller.GetPDClient(tku.pdControl, tc).BeginEvictLeader(storeID)
if err != nil {
glog.Errorf("tikv upgrader: failed to begin evict leader: %d, %s/%s, %v",
storeID, ns, podName, err)
return err
}
glog.Infof("tikv upgrader: begin evict leader: %d, %s/%s successfully", storeID, ns, podName)
if pod.Annotations == nil {
pod.Annotations = map[string]string{}
}
now := time.Now().Format(time.RFC3339)
pod.Annotations[EvictLeaderBeginTime] = now
_, err = tku.podControl.UpdatePod(tc, pod)
if err != nil {
glog.Errorf("tikv upgrader: failed to set pod %s/%s annotation %s to %s, %v",
ns, podName, EvictLeaderBeginTime, now, err)
return err
}
glog.Infof("tikv upgrader: set pod %s/%s annotation %s to %s successfully",
ns, podName, EvictLeaderBeginTime, now)
return nil
}
func (tku *tikvUpgrader) endEvictLeader(tc *v1alpha1.TidbCluster, ordinal int32) error {
// wait 5 second before delete evict scheduler,it is for auto test can catch these info
if controller.TestMode {
time.Sleep(5 * time.Second)
}
store := tku.getStoreByOrdinal(tc, ordinal)
storeID, err := strconv.ParseUint(store.ID, 10, 64)
if err != nil {
return err
}
err = tku.pdControl.GetPDClient(pdapi.Namespace(tc.GetNamespace()), tc.GetName()).EndEvictLeader(storeID)
if err != nil {
glog.Errorf("tikv upgrader: failed to end evict leader storeID: %d ordinal: %d, %v", storeID, ordinal, err)
return err
}
glog.Infof("tikv upgrader: end evict leader storeID: %d ordinal: %d successfully", storeID, ordinal)
return nil
}
func (tku *tikvUpgrader) getStoreByOrdinal(tc *v1alpha1.TidbCluster, ordinal int32) *v1alpha1.TiKVStore {
podName := tikvPodName(tc.GetName(), ordinal)
for _, store := range tc.Status.TiKV.Stores {
if store.PodName == podName {
return &store
}
}
return nil
}
type fakeTiKVUpgrader struct{}
// NewFakeTiKVUpgrader returns a fake tikv upgrader
func NewFakeTiKVUpgrader() Upgrader {
return &fakeTiKVUpgrader{}
}
func (tku *fakeTiKVUpgrader) Upgrade(tc *v1alpha1.TidbCluster, _ *apps.StatefulSet, _ *apps.StatefulSet) error {
tc.Status.TiKV.Phase = v1alpha1.UpgradePhase
return nil
}