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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 command
import (
"context"
"crypto/tls"
"fmt"
"time"
"github.com/pingcap/errors"
dm "github.com/pingcap/tiup/components/dm/spec"
dmtask "github.com/pingcap/tiup/components/dm/task"
"github.com/pingcap/tiup/pkg/cluster/api"
operator "github.com/pingcap/tiup/pkg/cluster/operation"
"github.com/pingcap/tiup/pkg/cluster/spec"
"github.com/pingcap/tiup/pkg/cluster/task"
"github.com/pingcap/tiup/pkg/set"
"github.com/pingcap/tiup/pkg/utils"
"github.com/spf13/cobra"
)
func newScaleInCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "scale-in <cluster-name>",
Short: "Scale in a DM cluster",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 {
return cmd.Help()
}
clusterName := args[0]
scale := func(b *task.Builder, imetadata spec.Metadata, tlsCfg *tls.Config) {
metadata := imetadata.(*dm.Metadata)
b.Func(
fmt.Sprintf("ScaleInCluster: options=%+v", gOpt),
func(ctx context.Context) error {
return ScaleInDMCluster(ctx, metadata.Topology, gOpt, tlsCfg)
},
).Serial(dmtask.NewUpdateDMMeta(clusterName, metadata, gOpt.Nodes))
}
return cm.ScaleIn(clusterName, skipConfirm, gOpt, scale)
},
ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
switch len(args) {
case 0:
return shellCompGetClusterName(cm, toComplete)
default:
return nil, cobra.ShellCompDirectiveNoFileComp
}
},
}
cmd.Flags().StringSliceVarP(&gOpt.Nodes, "node", "N", nil, "Specify the nodes (required)")
cmd.Flags().BoolVar(&gOpt.Force, "force", false, "Force just try stop and destroy instance before removing the instance from topo")
_ = cmd.MarkFlagRequired("node")
return cmd
}
// ScaleInDMCluster scale in dm cluster.
func ScaleInDMCluster(
ctx context.Context,
topo *dm.Specification,
options operator.Options,
tlsCfg *tls.Config,
) error {
// instances by uuid
instances := map[string]dm.Instance{}
instCount := map[string]int{}
// make sure all nodeIds exists in topology
for _, component := range topo.ComponentsByStartOrder() {
for _, instance := range component.Instances() {
instances[instance.ID()] = instance
instCount[instance.GetManageHost()]++
}
}
// Clean components
deletedDiff := map[string][]dm.Instance{}
deletedNodes := set.NewStringSet(options.Nodes...)
for nodeID := range deletedNodes {
inst, found := instances[nodeID]
if !found {
return errors.Errorf("cannot find node id '%s' in topology", nodeID)
}
deletedDiff[inst.ComponentName()] = append(deletedDiff[inst.ComponentName()], inst)
}
// Cannot delete all DM DMMaster servers
if len(deletedDiff[dm.ComponentDMMaster]) == len(topo.Masters) {
return errors.New("cannot delete all dm-master servers")
}
if options.Force {
for _, component := range topo.ComponentsByStartOrder() {
for _, instance := range component.Instances() {
if !deletedNodes.Exist(instance.ID()) {
continue
}
instCount[instance.GetManageHost()]--
if err := operator.StopAndDestroyInstance(ctx, topo, instance, options, false, instCount[instance.GetManageHost()] == 0, tlsCfg); err != nil {
log.Warnf("failed to stop/destroy %s: %v", component.Name(), err)
}
}
}
return nil
}
// At least a DMMaster server exists
var dmMasterClient *api.DMMasterClient
var dmMasterEndpoint []string
for _, instance := range (&dm.DMMasterComponent{Topology: topo}).Instances() {
if !deletedNodes.Exist(instance.ID()) {
dmMasterEndpoint = append(dmMasterEndpoint, utils.JoinHostPort(instance.GetManageHost(), instance.GetPort()))
}
}
if len(dmMasterEndpoint) == 0 {
return errors.New("cannot find available dm-master instance")
}
dmMasterClient = api.NewDMMasterClient(dmMasterEndpoint, 10*time.Second, tlsCfg)
noAgentHosts := set.NewStringSet()
topo.IterInstance(func(inst dm.Instance) {
if inst.IgnoreMonitorAgent() {
noAgentHosts.Insert(inst.GetManageHost())
}
})
// Delete member from cluster
for _, component := range topo.ComponentsByStartOrder() {
for _, instance := range component.Instances() {
if !deletedNodes.Exist(instance.ID()) {
continue
}
if err := operator.StopComponent(
ctx,
topo,
[]dm.Instance{instance},
noAgentHosts,
options,
false,
false, /* evictLeader */
&tls.Config{}, /* not used as evictLeader is false */
); err != nil {
return errors.Annotatef(err, "failed to stop %s", component.Name())
}
switch component.Name() {
case dm.ComponentDMMaster:
name := instance.(*dm.MasterInstance).Name
err := dmMasterClient.OfflineMaster(name, nil)
if err != nil {
return err
}
case dm.ComponentDMWorker:
name := instance.(*dm.WorkerInstance).Name
err := dmMasterClient.OfflineWorker(name, nil)
if err != nil {
return err
}
}
if err := operator.DestroyComponent(ctx, []dm.Instance{instance}, topo, options); err != nil {
return errors.Annotatef(err, "failed to destroy %s", component.Name())
}
instCount[instance.GetManageHost()]--
if instCount[instance.GetManageHost()] == 0 {
if err := operator.DeletePublicKey(ctx, instance.GetManageHost()); err != nil {
return errors.Annotatef(err, "failed to delete public key")
}
}
}
}
return nil
}
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