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pd_scaler.go
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/
pd_scaler.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"
"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/label"
"github.com/pingcap/tidb-operator/pkg/pdapi"
apps "k8s.io/api/apps/v1"
corelisters "k8s.io/client-go/listers/core/v1"
)
// TODO add e2e test specs
type pdScaler struct {
generalScaler
}
// NewPDScaler returns a Scaler
func NewPDScaler(pdControl pdapi.PDControlInterface,
pvcLister corelisters.PersistentVolumeClaimLister,
pvcControl controller.PVCControlInterface) Scaler {
return &pdScaler{generalScaler{pdControl, pvcLister, pvcControl}}
}
func (psd *pdScaler) ScaleOut(tc *v1alpha1.TidbCluster, oldSet *apps.StatefulSet, newSet *apps.StatefulSet) error {
ns := tc.GetNamespace()
tcName := tc.GetName()
if tc.PDUpgrading() {
resetReplicas(newSet, oldSet)
return nil
}
_, err := psd.deleteDeferDeletingPVC(tc, oldSet.GetName(), v1alpha1.PDMemberType, *oldSet.Spec.Replicas)
if err != nil {
resetReplicas(newSet, oldSet)
return err
}
if !tc.Status.PD.Synced {
resetReplicas(newSet, oldSet)
return fmt.Errorf("TidbCluster: %s/%s's pd status sync failed,can't scale out now", ns, tcName)
}
if len(tc.Status.PD.FailureMembers) != 0 {
increaseReplicas(newSet, oldSet)
return nil
}
var i int32 = 0
healthCount := 0
totalCount := *oldSet.Spec.Replicas
for ; i < totalCount; i++ {
podName := ordinalPodName(v1alpha1.PDMemberType, tcName, i)
if member, ok := tc.Status.PD.Members[podName]; ok && member.Health {
healthCount++
}
}
if healthCount < int(totalCount) {
resetReplicas(newSet, oldSet)
return fmt.Errorf("TidbCluster: %s/%s's pd %d/%d is ready, can't scale out now",
ns, tcName, healthCount, totalCount)
}
increaseReplicas(newSet, oldSet)
return nil
}
// We need remove member from cluster before reducing statefulset replicas
// only remove one member at a time when scale down
func (psd *pdScaler) ScaleIn(tc *v1alpha1.TidbCluster, oldSet *apps.StatefulSet, newSet *apps.StatefulSet) error {
ns := tc.GetNamespace()
tcName := tc.GetName()
ordinal := *oldSet.Spec.Replicas - 1
memberName := fmt.Sprintf("%s-pd-%d", tc.GetName(), ordinal)
setName := oldSet.GetName()
if tc.PDUpgrading() {
resetReplicas(newSet, oldSet)
return nil
}
if !tc.Status.PD.Synced {
resetReplicas(newSet, oldSet)
return fmt.Errorf("TidbCluster: %s/%s's pd status sync failed,can't scale in now", ns, tcName)
}
err := controller.GetPDClient(psd.pdControl, tc).DeleteMember(memberName)
if err != nil {
glog.Errorf("pd scale in: failed to delete member %s, %v", memberName, err)
resetReplicas(newSet, oldSet)
return err
}
glog.Infof("pd scale in: delete member %s successfully", memberName)
pvcName := ordinalPVCName(v1alpha1.PDMemberType, setName, ordinal)
pvc, err := psd.pvcLister.PersistentVolumeClaims(ns).Get(pvcName)
if err != nil {
resetReplicas(newSet, oldSet)
return err
}
if pvc.Annotations == nil {
pvc.Annotations = map[string]string{}
}
now := time.Now().Format(time.RFC3339)
pvc.Annotations[label.AnnPVCDeferDeleting] = now
_, err = psd.pvcControl.UpdatePVC(tc, pvc)
if err != nil {
glog.Errorf("pd scale in: failed to set pvc %s/%s annotation: %s to %s",
ns, pvcName, label.AnnPVCDeferDeleting, now)
resetReplicas(newSet, oldSet)
return err
}
glog.Infof("pd scale in: set pvc %s/%s annotation: %s to %s",
ns, pvcName, label.AnnPVCDeferDeleting, now)
decreaseReplicas(newSet, oldSet)
return nil
}
type fakePDScaler struct{}
// NewFakePDScaler returns a fake Scaler
func NewFakePDScaler() Scaler {
return &fakePDScaler{}
}
func (fsd *fakePDScaler) ScaleOut(_ *v1alpha1.TidbCluster, oldSet *apps.StatefulSet, newSet *apps.StatefulSet) error {
increaseReplicas(newSet, oldSet)
return nil
}
func (fsd *fakePDScaler) ScaleIn(_ *v1alpha1.TidbCluster, oldSet *apps.StatefulSet, newSet *apps.StatefulSet) error {
decreaseReplicas(newSet, oldSet)
return nil
}