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| // Copyright 2020 TiKV Project Authors. | ||
| // | ||
| // 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 checker | ||
|
|
||
| import ( | ||
| "github.com/pingcap/log" | ||
| "github.com/tikv/pd/server/core" | ||
| "github.com/tikv/pd/server/schedule/filter" | ||
| "github.com/tikv/pd/server/schedule/opt" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| // ReplicaStrategy collects some utilities to manipulate region peers. It | ||
| // exists to allow replica_checker and rule_checker to reuse common logics. | ||
| type ReplicaStrategy struct { | ||
| checkerName string // replica-checker / rule-checker | ||
| cluster opt.Cluster | ||
| locationLabels []string | ||
| isolationLevel string | ||
| region *core.RegionInfo | ||
| extraFilters []filter.Filter | ||
| } | ||
|
|
||
| // SelectStoreToAdd returns the store to add a replica to a region. | ||
| // `coLocationStores` are the stores used to compare location with target | ||
| // store. | ||
| // `extraFilters` is used to set up more filters based on the context that | ||
| // calling this method. | ||
| // | ||
| // For example, to select a target store to replace a region's peer, we can use | ||
| // the peer list with the peer removed as `coLocationStores`. | ||
| // Meanwhile, we need to provide more constraints to ensure that the isolation | ||
| // level cannot be reduced after replacement. | ||
| func (s *ReplicaStrategy) SelectStoreToAdd(coLocationStores []*core.StoreInfo, extraFilters ...filter.Filter) uint64 { | ||
| // The selection process uses a two-stage fashion. The first stage | ||
| // ignores the temporary state of the stores and selects the stores | ||
| // with the highest score according to the location label. The second | ||
| // stage considers all temporary states and capacity factors to select | ||
| // the most suitable target. | ||
| // | ||
| // The reason for it is to prevent the non-optimal replica placement due | ||
| // to the short-term state, resulting in redundant scheduling. | ||
| filters := []filter.Filter{ | ||
| filter.NewExcludedFilter(s.checkerName, nil, s.region.GetStoreIds()), | ||
| filter.NewStorageThresholdFilter(s.checkerName), | ||
| filter.NewSpecialUseFilter(s.checkerName), | ||
| &filter.StoreStateFilter{ActionScope: s.checkerName, MoveRegion: true, AllowTemporaryStates: true}, | ||
| } | ||
| if len(s.locationLabels) > 0 && s.isolationLevel != "" { | ||
| filters = append(filters, filter.NewIsolationFilter(s.checkerName, s.isolationLevel, s.locationLabels, coLocationStores)) | ||
| } | ||
| if len(extraFilters) > 0 { | ||
| filters = append(filters, extraFilters...) | ||
| } | ||
| if len(s.extraFilters) > 0 { | ||
| filters = append(filters, s.extraFilters...) | ||
| } | ||
|
|
||
| isolationComparer := filter.IsolationComparer(s.locationLabels, coLocationStores) | ||
| strictStateFilter := &filter.StoreStateFilter{ActionScope: s.checkerName, MoveRegion: true} | ||
| target := filter.NewCandidates(s.cluster.GetStores()). | ||
| FilterTarget(s.cluster.GetOpts(), filters...). | ||
| Sort(isolationComparer).Reverse().Top(isolationComparer). // greater isolation score is better | ||
| Sort(filter.RegionScoreComparer(s.cluster.GetOpts())). // less region score is better | ||
| FilterTarget(s.cluster.GetOpts(), strictStateFilter).PickFirst() // the filter does not ignore temp states | ||
| if target == nil { | ||
| return 0 | ||
| } | ||
| return target.GetID() | ||
| } | ||
|
|
||
| // SelectStoreToReplace returns a store to replace oldStore. The location | ||
| // placement after scheduling should be not worse than original. | ||
| func (s *ReplicaStrategy) SelectStoreToReplace(coLocationStores []*core.StoreInfo, old uint64) uint64 { | ||
| // trick to avoid creating a slice with `old` removed. | ||
| s.swapStoreToFirst(coLocationStores, old) | ||
| safeGuard := filter.NewLocationSafeguard(s.checkerName, s.locationLabels, coLocationStores, s.cluster.GetStore(old)) | ||
| return s.SelectStoreToAdd(coLocationStores[1:], safeGuard) | ||
| } | ||
|
|
||
| // SelectStoreToImprove returns a store to replace oldStore. The location | ||
| // placement after scheduling should be better than original. | ||
| func (s *ReplicaStrategy) SelectStoreToImprove(coLocationStores []*core.StoreInfo, old uint64) uint64 { | ||
| // trick to avoid creating a slice with `old` removed. | ||
| s.swapStoreToFirst(coLocationStores, old) | ||
| filters := []filter.Filter{ | ||
| filter.NewLocationImprover(s.checkerName, s.locationLabels, coLocationStores, s.cluster.GetStore(old)), | ||
| } | ||
| if len(s.locationLabels) > 0 && s.isolationLevel != "" { | ||
| filters = append(filters, filter.NewIsolationFilter(s.checkerName, s.isolationLevel, s.locationLabels, coLocationStores[1:])) | ||
| } | ||
| return s.SelectStoreToAdd(coLocationStores[1:], filters...) | ||
| } | ||
|
|
||
| func (s *ReplicaStrategy) swapStoreToFirst(stores []*core.StoreInfo, id uint64) { | ||
| for i, s := range stores { | ||
| if s.GetID() == id { | ||
| stores[0], stores[i] = stores[i], stores[0] | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // SelectStoreToRemove returns the best option to remove from the region. | ||
| func (s *ReplicaStrategy) SelectStoreToRemove(coLocationStores []*core.StoreInfo) uint64 { | ||
| isolationComparer := filter.IsolationComparer(s.locationLabels, coLocationStores) | ||
| source := filter.NewCandidates(coLocationStores). | ||
| FilterSource(s.cluster.GetOpts(), &filter.StoreStateFilter{ActionScope: replicaCheckerName, MoveRegion: true}). | ||
| Sort(isolationComparer).Top(isolationComparer). | ||
| Sort(filter.RegionScoreComparer(s.cluster.GetOpts())).Reverse(). | ||
| PickFirst() | ||
| if source == nil { | ||
| log.Debug("no removable store", zap.Uint64("region-id", s.region.GetID())) | ||
| return 0 | ||
| } | ||
| return source.GetID() | ||
| } |
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