/
label.go
146 lines (132 loc) · 4.83 KB
/
label.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 schedulers
import (
"github.com/pingcap/log"
"github.com/pingcap/pd/v4/server/core"
"github.com/pingcap/pd/v4/server/schedule"
"github.com/pingcap/pd/v4/server/schedule/filter"
"github.com/pingcap/pd/v4/server/schedule/operator"
"github.com/pingcap/pd/v4/server/schedule/opt"
"github.com/pingcap/pd/v4/server/schedule/selector"
"github.com/pkg/errors"
"go.uber.org/zap"
)
const (
// LabelName is label scheduler name.
LabelName = "label-scheduler"
// LabelType is label scheduler type.
LabelType = "label"
)
func init() {
schedule.RegisterSliceDecoderBuilder(LabelType, func(args []string) schedule.ConfigDecoder {
return func(v interface{}) error {
conf, ok := v.(*labelSchedulerConfig)
if !ok {
return ErrScheduleConfigNotExist
}
ranges, err := getKeyRanges(args)
if err != nil {
return errors.WithStack(err)
}
conf.Ranges = ranges
conf.Name = LabelName
return nil
}
})
schedule.RegisterScheduler(LabelType, func(opController *schedule.OperatorController, storage *core.Storage, decoder schedule.ConfigDecoder) (schedule.Scheduler, error) {
conf := &labelSchedulerConfig{}
if err := decoder(conf); err != nil {
return nil, err
}
return newLabelScheduler(opController, conf), nil
})
}
type labelSchedulerConfig struct {
Name string `json:"name"`
Ranges []core.KeyRange `json:"ranges"`
}
type labelScheduler struct {
*BaseScheduler
conf *labelSchedulerConfig
selector *selector.BalanceSelector
}
// LabelScheduler is mainly based on the store's label information for scheduling.
// Now only used for reject leader schedule, that will move the leader out of
// the store with the specific label.
func newLabelScheduler(opController *schedule.OperatorController, conf *labelSchedulerConfig) schedule.Scheduler {
filters := []filter.Filter{
filter.StoreStateFilter{ActionScope: LabelName, TransferLeader: true},
}
kind := core.NewScheduleKind(core.LeaderKind, core.ByCount)
return &labelScheduler{
BaseScheduler: NewBaseScheduler(opController),
conf: conf,
selector: selector.NewBalanceSelector(kind, filters),
}
}
func (s *labelScheduler) GetName() string {
return s.conf.Name
}
func (s *labelScheduler) GetType() string {
return LabelType
}
func (s *labelScheduler) EncodeConfig() ([]byte, error) {
return schedule.EncodeConfig(s.conf)
}
func (s *labelScheduler) IsScheduleAllowed(cluster opt.Cluster) bool {
return s.OpController.OperatorCount(operator.OpLeader) < cluster.GetLeaderScheduleLimit()
}
func (s *labelScheduler) Schedule(cluster opt.Cluster) []*operator.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
stores := cluster.GetStores()
rejectLeaderStores := make(map[uint64]struct{})
for _, s := range stores {
if cluster.CheckLabelProperty(opt.RejectLeader, s.GetLabels()) {
rejectLeaderStores[s.GetID()] = struct{}{}
}
}
if len(rejectLeaderStores) == 0 {
schedulerCounter.WithLabelValues(s.GetName(), "skip").Inc()
return nil
}
log.Debug("label scheduler reject leader store list", zap.Reflect("stores", rejectLeaderStores))
for id := range rejectLeaderStores {
if region := cluster.RandLeaderRegion(id, s.conf.Ranges); region != nil {
log.Debug("label scheduler selects region to transfer leader", zap.Uint64("region-id", region.GetID()))
excludeStores := make(map[uint64]struct{})
for _, p := range region.GetDownPeers() {
excludeStores[p.GetPeer().GetStoreId()] = struct{}{}
}
for _, p := range region.GetPendingPeers() {
excludeStores[p.GetStoreId()] = struct{}{}
}
f := filter.NewExcludedFilter(s.GetName(), nil, excludeStores)
target := s.selector.SelectTarget(cluster, cluster.GetFollowerStores(region), f)
if target == nil {
log.Debug("label scheduler no target found for region", zap.Uint64("region-id", region.GetID()))
schedulerCounter.WithLabelValues(s.GetName(), "no-target").Inc()
continue
}
op, err := operator.CreateTransferLeaderOperator("label-reject-leader", cluster, region, id, target.GetID(), operator.OpLeader)
if err != nil {
log.Debug("fail to create transfer label reject leader operator", zap.Error(err))
return nil
}
op.Counters = append(op.Counters, schedulerCounter.WithLabelValues(s.GetName(), "new-operator"))
return []*operator.Operator{op}
}
}
schedulerCounter.WithLabelValues(s.GetName(), "no-region").Inc()
return nil
}