/
shuffle_region.go
119 lines (100 loc) · 3.69 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 (
"github.com/pingcap/kvproto/pkg/metapb"
log "github.com/pingcap/log"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/schedule"
"go.uber.org/zap"
)
func init() {
schedule.RegisterScheduler("shuffle-region", func(limiter *schedule.Limiter, args []string) (schedule.Scheduler, error) {
return newShuffleRegionScheduler(limiter), nil
})
}
type shuffleRegionScheduler struct {
*baseScheduler
selector *schedule.RandomSelector
}
// newShuffleRegionScheduler creates an admin scheduler that shuffles regions
// between stores.
func newShuffleRegionScheduler(limiter *schedule.Limiter) schedule.Scheduler {
filters := []schedule.Filter{schedule.StoreStateFilter{MoveRegion: true}}
base := newBaseScheduler(limiter)
return &shuffleRegionScheduler{
baseScheduler: base,
selector: schedule.NewRandomSelector(filters),
}
}
func (s *shuffleRegionScheduler) GetName() string {
return "shuffle-region-scheduler"
}
func (s *shuffleRegionScheduler) GetType() string {
return "shuffle-region"
}
func (s *shuffleRegionScheduler) IsScheduleAllowed(cluster schedule.Cluster) bool {
return s.limiter.OperatorCount(schedule.OpRegion) < cluster.GetRegionScheduleLimit()
}
func (s *shuffleRegionScheduler) Schedule(cluster schedule.Cluster, opInfluence schedule.OpInfluence) []*schedule.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
region, oldPeer := s.scheduleRemovePeer(cluster)
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_region").Inc()
return nil
}
excludedFilter := schedule.NewExcludedFilter(nil, region.GetStoreIds())
newPeer := s.scheduleAddPeer(cluster, excludedFilter)
if newPeer == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_new_peer").Inc()
return nil
}
op, err := schedule.CreateMovePeerOperator("shuffle-region", cluster, region, schedule.OpAdmin, oldPeer.GetStoreId(), newPeer.GetStoreId(), newPeer.GetId())
if err != nil {
schedulerCounter.WithLabelValues(s.GetName(), "create_operator_fail").Inc()
return nil
}
schedulerCounter.WithLabelValues(s.GetName(), "new_operator").Inc()
op.SetPriorityLevel(core.HighPriority)
return []*schedule.Operator{op}
}
func (s *shuffleRegionScheduler) scheduleRemovePeer(cluster schedule.Cluster) (*core.RegionInfo, *metapb.Peer) {
stores := cluster.GetStores()
source := s.selector.SelectSource(cluster, stores)
if source == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_store").Inc()
return nil, nil
}
region := cluster.RandFollowerRegion(source.GetId(), core.HealthRegion())
if region == nil {
region = cluster.RandLeaderRegion(source.GetId(), core.HealthRegion())
}
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_region").Inc()
return nil, nil
}
return region, region.GetStorePeer(source.GetId())
}
func (s *shuffleRegionScheduler) scheduleAddPeer(cluster schedule.Cluster, filter schedule.Filter) *metapb.Peer {
stores := cluster.GetStores()
target := s.selector.SelectTarget(cluster, stores, filter)
if target == nil {
return nil
}
newPeer, err := cluster.AllocPeer(target.GetId())
if err != nil {
log.Error("failed to allocate peer", zap.Error(err))
return nil
}
return newPeer
}