scheduler: reduce GetStore in hot-region-scheduler (#3870)

server/schedulers/hot_region.go

@@ -190,11 +190,13 @@ func (h *hotScheduler) dispatch(typ rwType, cluster opt.Cluster) []*operator.Ope
 func (h *hotScheduler) prepareForBalance(cluster opt.Cluster) {
 	h.summaryPendingInfluence()
 
+	stores := cluster.GetStores()
 	storesLoads := cluster.GetStoresLoads()
 
 	{ // update read statistics
 		regionRead := cluster.RegionReadStats()
 		h.stLoadInfos[readLeader] = summaryStoresLoad(
+			stores,
 			storesLoads,
 			h.pendingSums[readLeader],
 			regionRead,
@@ -204,12 +206,14 @@ func (h *hotScheduler) prepareForBalance(cluster opt.Cluster) {
 	{ // update write statistics
 		regionWrite := cluster.RegionWriteStats()
 		h.stLoadInfos[writeLeader] = summaryStoresLoad(
+			stores,
 			storesLoads,
 			h.pendingSums[writeLeader],
 			regionWrite,
 			write, core.LeaderKind)
 
 		h.stLoadInfos[writePeer] = summaryStoresLoad(
+			stores,
 			storesLoads,
 			h.pendingSums[writePeer],
 			regionWrite,
@@ -254,6 +258,7 @@ func (h *hotScheduler) gcRegionPendings() {
 // summaryStoresLoad Load information of all available stores.
 // it will filtered the hot peer and calculate the current and future stat(byte/key rate,count) for each store
 func summaryStoresLoad(
+	stores []*core.StoreInfo,
 	storesLoads map[uint64][]float64,
 	storePendings map[uint64]Influence,
 	storeHotPeers map[uint64][]*statistics.HotPeerStat,
@@ -266,7 +271,12 @@ func summaryStoresLoad(
 	allKeySum := 0.0
 	allCount := 0.0
 
-	for id, loads := range storesLoads {
+	for _, store := range stores {
+		id := store.GetID()
+		loads, ok := storesLoads[id]
+		if !ok {
+			continue
+		}
 		var byteRate, keyRate float64
 		switch rwTy {
 		case read:
@@ -316,6 +326,7 @@ func summaryStoresLoad(
 
 		// Construct store load info.
 		loadDetail[id] = &storeLoadDetail{
+			Store:    store,
 			LoadPred: stLoadPred,
 			HotPeers: hotPeers,
 		}
@@ -563,10 +574,6 @@ func (bs *balanceSolver) solve() []*operator.Operator {
 func (bs *balanceSolver) filterSrcStores() map[uint64]*storeLoadDetail {
 	ret := make(map[uint64]*storeLoadDetail)
 	for id, detail := range bs.stLoadDetail {
-		if bs.cluster.GetStore(id) == nil {
-			log.Error("failed to get the source store", zap.Uint64("store-id", id), errs.ZapError(errs.ErrGetSourceStore))
-			continue
-		}
 		if len(detail.HotPeers) == 0 {
 			continue
 		}
@@ -701,12 +708,9 @@ func (bs *balanceSolver) getRegion() *core.RegionInfo {
 func (bs *balanceSolver) filterDstStores() map[uint64]*storeLoadDetail {
 	var (
 		filters    []filter.Filter
-		candidates []*core.StoreInfo
+		candidates []*storeLoadDetail
 	)
-	srcStore := bs.cluster.GetStore(bs.cur.srcStoreID)
-	if srcStore == nil {
-		return nil
-	}
+	srcStore := bs.stLoadDetail[bs.cur.srcStoreID].Store
 	switch bs.opTy {
 	case movePeer:
 		filters = []filter.Filter{
@@ -716,8 +720,8 @@ func (bs *balanceSolver) filterDstStores() map[uint64]*storeLoadDetail {
 			filter.NewPlacementSafeguard(bs.sche.GetName(), bs.cluster, bs.cur.region, srcStore),
 		}
 
-		for storeID := range bs.stLoadDetail {
-			candidates = append(candidates, bs.cluster.GetStore(storeID))
+		for _, detail := range bs.stLoadDetail {
+			candidates = append(candidates, detail)
 		}
 
 	case transferLeader:
@@ -729,9 +733,9 @@ func (bs *balanceSolver) filterDstStores() map[uint64]*storeLoadDetail {
 			filters = append(filters, leaderFilter)
 		}
 
-		for _, store := range bs.cluster.GetFollowerStores(bs.cur.region) {
-			if _, ok := bs.stLoadDetail[store.GetID()]; ok {
-				candidates = append(candidates, store)
+		for _, peer := range bs.cur.region.GetFollowers() {
+			if detail, ok := bs.stLoadDetail[peer.GetStoreId()]; ok {
+				candidates = append(candidates, detail)
 			}
 		}
 
@@ -741,15 +745,15 @@ func (bs *balanceSolver) filterDstStores() map[uint64]*storeLoadDetail {
 	return bs.pickDstStores(filters, candidates)
 }
 
-func (bs *balanceSolver) pickDstStores(filters []filter.Filter, candidates []*core.StoreInfo) map[uint64]*storeLoadDetail {
+func (bs *balanceSolver) pickDstStores(filters []filter.Filter, candidates []*storeLoadDetail) map[uint64]*storeLoadDetail {
 	ret := make(map[uint64]*storeLoadDetail, len(candidates))
 	dstToleranceRatio := bs.sche.conf.GetDstToleranceRatio()
-	for _, store := range candidates {
+	for _, detail := range candidates {
+		store := detail.Store
 		if filter.Target(bs.cluster.GetOpts(), store, filters) {
-			detail := bs.stLoadDetail[store.GetID()]
 			if detail.LoadPred.max().ByteRate*dstToleranceRatio < detail.LoadPred.Expect.ByteRate &&
 				detail.LoadPred.max().KeyRate*dstToleranceRatio < detail.LoadPred.Expect.KeyRate {
-				ret[store.GetID()] = bs.stLoadDetail[store.GetID()]
+				ret[store.GetID()] = detail
 				hotSchedulerResultCounter.WithLabelValues("dst-store-succ", strconv.FormatUint(store.GetID(), 10)).Inc()
 			}
 			hotSchedulerResultCounter.WithLabelValues("dst-store-fail", strconv.FormatUint(store.GetID(), 10)).Inc()

server/schedulers/shuffle_hot_region.go

@@ -132,17 +132,20 @@ func (s *shuffleHotRegionScheduler) Schedule(cluster opt.Cluster) []*operator.Op
 }
 
 func (s *shuffleHotRegionScheduler) dispatch(typ rwType, cluster opt.Cluster) []*operator.Operator {
+	stores := cluster.GetStores()
 	storesLoads := cluster.GetStoresLoads()
 	switch typ {
 	case read:
 		s.stLoadInfos[readLeader] = summaryStoresLoad(
+			stores,
 			storesLoads,
 			map[uint64]Influence{},
 			cluster.RegionReadStats(),
 			read, core.LeaderKind)
 		return s.randomSchedule(cluster, s.stLoadInfos[readLeader])
 	case write:
 		s.stLoadInfos[writeLeader] = summaryStoresLoad(
+			stores,
 			storesLoads,
 			map[uint64]Influence{},
 			cluster.RegionWriteStats(),

server/schedulers/utils.go

@@ -326,6 +326,7 @@ func maxLoad(a, b *storeLoad) *storeLoad {
 }
 
 type storeLoadDetail struct {
+	Store    *core.StoreInfo
 	LoadPred *storeLoadPred
 	HotPeers []*statistics.HotPeerStat
 }