/
random_merge.go
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/
random_merge.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 (
"math/rand"
"github.com/pingcap/log"
"github.com/pingcap/pd/v3/server/core"
"github.com/pingcap/pd/v3/server/schedule"
"github.com/pingcap/pd/v3/server/schedule/checker"
"github.com/pingcap/pd/v3/server/schedule/filter"
"github.com/pingcap/pd/v3/server/schedule/operator"
"github.com/pingcap/pd/v3/server/schedule/opt"
"github.com/pingcap/pd/v3/server/schedule/selector"
"github.com/pkg/errors"
"go.uber.org/zap"
)
const (
// RandomMergeName is random merge scheduler name.
RandomMergeName = "random-merge-scheduler"
// RandomMergeType is random merge scheduler type.
RandomMergeType = "random-merge"
)
func init() {
schedule.RegisterSliceDecoderBuilder(RandomMergeType, func(args []string) schedule.ConfigDecoder {
return func(v interface{}) error {
conf, ok := v.(*randomMergeSchedulerConfig)
if !ok {
return ErrScheduleConfigNotExist
}
ranges, err := getKeyRanges(args)
if err != nil {
return errors.WithStack(err)
}
conf.Ranges = ranges
conf.Name = RandomMergeName
return nil
}
})
schedule.RegisterScheduler(RandomMergeType, func(opController *schedule.OperatorController, storage *core.Storage, decoder schedule.ConfigDecoder) (schedule.Scheduler, error) {
conf := &randomMergeSchedulerConfig{}
if err := decoder(conf); err != nil {
return nil, err
}
return newRandomMergeScheduler(opController, conf), nil
})
}
type randomMergeSchedulerConfig struct {
Name string `json:"name"`
Ranges []core.KeyRange `json:"ranges"`
}
type randomMergeScheduler struct {
*BaseScheduler
conf *randomMergeSchedulerConfig
selector *selector.RandomSelector
}
// newRandomMergeScheduler creates an admin scheduler that randomly picks two adjacent regions
// then merges them.
func newRandomMergeScheduler(opController *schedule.OperatorController, conf *randomMergeSchedulerConfig) schedule.Scheduler {
filters := []filter.Filter{
filter.StoreStateFilter{ActionScope: conf.Name, MoveRegion: true},
}
base := NewBaseScheduler(opController)
return &randomMergeScheduler{
BaseScheduler: base,
conf: conf,
selector: selector.NewRandomSelector(filters),
}
}
func (s *randomMergeScheduler) GetName() string {
return s.conf.Name
}
func (s *randomMergeScheduler) GetType() string {
return RandomMergeType
}
func (s *randomMergeScheduler) EncodeConfig() ([]byte, error) {
return schedule.EncodeConfig(s.conf)
}
func (s *randomMergeScheduler) IsScheduleAllowed(cluster opt.Cluster) bool {
return s.OpController.OperatorCount(operator.OpMerge) < cluster.GetMergeScheduleLimit()
}
func (s *randomMergeScheduler) Schedule(cluster opt.Cluster) []*operator.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
stores := cluster.GetStores()
store := s.selector.SelectSource(cluster, stores)
if store == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-source-store").Inc()
return nil
}
region := cluster.RandLeaderRegion(store.GetID(), s.conf.Ranges, opt.HealthRegion(cluster))
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-region").Inc()
return nil
}
other, target := cluster.GetAdjacentRegions(region)
if !cluster.IsOneWayMergeEnabled() && ((rand.Int()%2 == 0 && other != nil) || target == nil) {
target = other
}
if target == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-target-store").Inc()
return nil
}
if !s.allowMerge(cluster, region, target) {
schedulerCounter.WithLabelValues(s.GetName(), "not-allowed").Inc()
return nil
}
ops, err := operator.CreateMergeRegionOperator(RandomMergeType, cluster, region, target, operator.OpAdmin)
if err != nil {
log.Debug("fail to create merge region operator", zap.Error(err))
return nil
}
ops[0].Counters = append(ops[0].Counters, schedulerCounter.WithLabelValues(s.GetName(), "new-operator"))
return ops
}
func (s *randomMergeScheduler) allowMerge(cluster opt.Cluster, region, target *core.RegionInfo) bool {
if !opt.IsRegionHealthy(cluster, region) || !opt.IsRegionHealthy(cluster, target) {
return false
}
if !opt.IsRegionReplicated(cluster, region) || !opt.IsRegionReplicated(cluster, target) {
return false
}
if cluster.IsRegionHot(region) || cluster.IsRegionHot(target) {
return false
}
return checker.AllowMerge(cluster, region, target)
}