/
shuffle_region.go
171 lines (150 loc) · 5.85 KB
/
shuffle_region.go
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// Copyright 2017 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 (
"net/http"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/pd/v3/server/core"
"github.com/pingcap/pd/v3/server/schedule"
"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"
)
const (
// ShuffleRegionName is shuffle region scheduler name.
ShuffleRegionName = "shuffle-region-scheduler"
// ShuffleRegionType is shuffle region scheduler type.
ShuffleRegionType = "shuffle-region"
)
func init() {
schedule.RegisterSliceDecoderBuilder(ShuffleRegionType, func(args []string) schedule.ConfigDecoder {
return func(v interface{}) error {
conf, ok := v.(*shuffleRegionSchedulerConfig)
if !ok {
return ErrScheduleConfigNotExist
}
ranges, err := getKeyRanges(args)
if err != nil {
return errors.WithStack(err)
}
conf.Ranges = ranges
conf.Roles = allRoles
return nil
}
})
schedule.RegisterScheduler(ShuffleRegionType, func(opController *schedule.OperatorController, storage *core.Storage, decoder schedule.ConfigDecoder) (schedule.Scheduler, error) {
conf := &shuffleRegionSchedulerConfig{storage: storage}
if err := decoder(conf); err != nil {
return nil, err
}
return newShuffleRegionScheduler(opController, conf), nil
})
}
type shuffleRegionScheduler struct {
*BaseScheduler
conf *shuffleRegionSchedulerConfig
selector *selector.RandomSelector
}
// newShuffleRegionScheduler creates an admin scheduler that shuffles regions
// between stores.
func newShuffleRegionScheduler(opController *schedule.OperatorController, conf *shuffleRegionSchedulerConfig) schedule.Scheduler {
filters := []filter.Filter{
filter.StoreStateFilter{ActionScope: ShuffleRegionName, MoveRegion: true},
}
base := NewBaseScheduler(opController)
return &shuffleRegionScheduler{
BaseScheduler: base,
conf: conf,
selector: selector.NewRandomSelector(filters),
}
}
func (s *shuffleRegionScheduler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
s.conf.ServeHTTP(w, r)
}
func (s *shuffleRegionScheduler) GetName() string {
return ShuffleRegionName
}
func (s *shuffleRegionScheduler) GetType() string {
return ShuffleRegionType
}
func (s *shuffleRegionScheduler) EncodeConfig() ([]byte, error) {
return s.conf.EncodeConfig()
}
func (s *shuffleRegionScheduler) IsScheduleAllowed(cluster opt.Cluster) bool {
return s.OpController.OperatorCount(operator.OpRegion) < cluster.GetRegionScheduleLimit()
}
func (s *shuffleRegionScheduler) Schedule(cluster opt.Cluster) []*operator.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
region, oldPeer := s.scheduleRemovePeer(cluster)
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-region").Inc()
return nil
}
newPeer := s.scheduleAddPeer(cluster, region, oldPeer)
if newPeer == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-new-peer").Inc()
return nil
}
op, err := operator.CreateMovePeerOperator(ShuffleRegionType, cluster, region, operator.OpAdmin, oldPeer.GetStoreId(), newPeer)
if err != nil {
schedulerCounter.WithLabelValues(s.GetName(), "create-operator-fail").Inc()
return nil
}
op.Counters = append(op.Counters, schedulerCounter.WithLabelValues(s.GetName(), "new-operator"))
op.SetPriorityLevel(core.HighPriority)
return []*operator.Operator{op}
}
func (s *shuffleRegionScheduler) scheduleRemovePeer(cluster opt.Cluster) (*core.RegionInfo, *metapb.Peer) {
stores := cluster.GetStores()
exclude := make(map[uint64]struct{})
excludeFilter := filter.NewExcludedFilter(s.GetType(), exclude, nil)
for {
source := s.selector.SelectSource(cluster, stores, excludeFilter)
if source == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no-source-store").Inc()
return nil, nil
}
var region *core.RegionInfo
if s.conf.IsRoleAllow(roleFollower) {
region = cluster.RandFollowerRegion(source.GetID(), s.conf.GetRanges(), opt.HealthRegion(cluster), opt.ReplicatedRegion(cluster))
}
if region == nil && s.conf.IsRoleAllow(roleLeader) {
region = cluster.RandLeaderRegion(source.GetID(), s.conf.GetRanges(), opt.HealthRegion(cluster), opt.ReplicatedRegion(cluster))
}
if region == nil && s.conf.IsRoleAllow(roleLearner) {
region = cluster.RandLearnerRegion(source.GetID(), s.conf.GetRanges(), opt.HealthRegion(cluster), opt.ReplicatedRegion(cluster))
}
if region != nil {
return region, region.GetStorePeer(source.GetID())
}
exclude[source.GetID()] = struct{}{}
schedulerCounter.WithLabelValues(s.GetName(), "no-region").Inc()
}
}
func (s *shuffleRegionScheduler) scheduleAddPeer(cluster opt.Cluster, region *core.RegionInfo, oldPeer *metapb.Peer) *metapb.Peer {
var scoreGuard filter.Filter
if cluster.IsPlacementRulesEnabled() {
scoreGuard = filter.NewRuleFitFilter(s.GetName(), cluster, region, oldPeer.GetStoreId())
} else {
scoreGuard = filter.NewDistinctScoreFilter(s.GetName(), cluster.GetLocationLabels(), cluster.GetRegionStores(region), cluster.GetStore(oldPeer.GetStoreId()))
}
excludedFilter := filter.NewExcludedFilter(s.GetName(), nil, region.GetStoreIds())
stores := cluster.GetStores()
target := s.selector.SelectTarget(cluster, stores, scoreGuard, excludedFilter)
if target == nil {
return nil
}
return &metapb.Peer{StoreId: target.GetID(), IsLearner: oldPeer.GetIsLearner()}
}