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hot_region_test.go
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hot_region_test.go
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// Copyright 2019 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package schedulers
import (
"encoding/hex"
"fmt"
"math"
"testing"
"time"
"github.com/docker/go-units"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/kvproto/pkg/pdpb"
"github.com/stretchr/testify/require"
"github.com/tikv/pd/pkg/core"
"github.com/tikv/pd/pkg/mock/mockcluster"
"github.com/tikv/pd/pkg/schedule/operator"
"github.com/tikv/pd/pkg/schedule/placement"
"github.com/tikv/pd/pkg/statistics"
"github.com/tikv/pd/pkg/statistics/buckets"
"github.com/tikv/pd/pkg/statistics/utils"
"github.com/tikv/pd/pkg/storage"
"github.com/tikv/pd/pkg/storage/endpoint"
"github.com/tikv/pd/pkg/utils/operatorutil"
"github.com/tikv/pd/pkg/utils/testutil"
"github.com/tikv/pd/pkg/utils/typeutil"
"github.com/tikv/pd/pkg/versioninfo"
)
func init() {
// disable denoising in test.
statistics.Denoising = false
statisticsInterval = 0
RegisterScheduler(utils.Write.String(), func(opController *operator.Controller, _ endpoint.ConfigStorage, _ ConfigDecoder, _ ...func(string) error) (Scheduler, error) {
cfg := initHotRegionScheduleConfig()
return newHotWriteScheduler(opController, cfg), nil
})
RegisterScheduler(utils.Read.String(), func(opController *operator.Controller, _ endpoint.ConfigStorage, _ ConfigDecoder, _ ...func(string) error) (Scheduler, error) {
return newHotReadScheduler(opController, initHotRegionScheduleConfig()), nil
})
}
func newHotReadScheduler(opController *operator.Controller, conf *hotRegionSchedulerConfig) *hotScheduler {
ret := newHotScheduler(opController, conf)
ret.name = ""
ret.types = []resourceType{readLeader, readPeer}
return ret
}
func newHotWriteScheduler(opController *operator.Controller, conf *hotRegionSchedulerConfig) *hotScheduler {
ret := newHotScheduler(opController, conf)
ret.name = ""
ret.types = []resourceType{writeLeader, writePeer}
return ret
}
func clearPendingInfluence(h *hotScheduler) {
h.regionPendings = make(map[uint64]*pendingInfluence)
}
func newTestRegion(id uint64) *core.RegionInfo {
peers := []*metapb.Peer{{Id: id*100 + 1, StoreId: 1}, {Id: id*100 + 2, StoreId: 2}, {Id: id*100 + 3, StoreId: 3}}
return core.NewRegionInfo(&metapb.Region{Id: id, Peers: peers}, peers[0])
}
func TestUpgrade(t *testing.T) {
re := require.New(t)
cancel, _, _, oc := prepareSchedulersTest()
defer cancel()
// new
sche, err := CreateScheduler(HotRegionType, oc, storage.NewStorageWithMemoryBackend(), ConfigSliceDecoder(HotRegionType, nil))
re.NoError(err)
hb := sche.(*hotScheduler)
re.Equal([]string{utils.QueryPriority, utils.BytePriority}, hb.conf.GetReadPriorities())
re.Equal([]string{utils.QueryPriority, utils.BytePriority}, hb.conf.GetWriteLeaderPriorities())
re.Equal([]string{utils.BytePriority, utils.KeyPriority}, hb.conf.GetWritePeerPriorities())
re.Equal("v2", hb.conf.GetRankFormulaVersion())
// upgrade from json(null)
sche, err = CreateScheduler(HotRegionType, oc, storage.NewStorageWithMemoryBackend(), ConfigJSONDecoder([]byte("null")))
re.NoError(err)
hb = sche.(*hotScheduler)
re.Equal([]string{utils.QueryPriority, utils.BytePriority}, hb.conf.GetReadPriorities())
re.Equal([]string{utils.QueryPriority, utils.BytePriority}, hb.conf.GetWriteLeaderPriorities())
re.Equal([]string{utils.BytePriority, utils.KeyPriority}, hb.conf.GetWritePeerPriorities())
re.Equal("v2", hb.conf.GetRankFormulaVersion())
// upgrade from < 5.2
config51 := `{"min-hot-byte-rate":100,"min-hot-key-rate":10,"min-hot-query-rate":10,"max-zombie-rounds":5,"max-peer-number":1000,"byte-rate-rank-step-ratio":0.05,"key-rate-rank-step-ratio":0.05,"query-rate-rank-step-ratio":0.05,"count-rank-step-ratio":0.01,"great-dec-ratio":0.95,"minor-dec-ratio":0.99,"src-tolerance-ratio":1.05,"dst-tolerance-ratio":1.05,"strict-picking-store":"true","enable-for-tiflash":"true"}`
sche, err = CreateScheduler(HotRegionType, oc, storage.NewStorageWithMemoryBackend(), ConfigJSONDecoder([]byte(config51)))
re.NoError(err)
hb = sche.(*hotScheduler)
re.Equal([]string{utils.BytePriority, utils.KeyPriority}, hb.conf.GetReadPriorities())
re.Equal([]string{utils.KeyPriority, utils.BytePriority}, hb.conf.GetWriteLeaderPriorities())
re.Equal([]string{utils.BytePriority, utils.KeyPriority}, hb.conf.GetWritePeerPriorities())
re.Equal("v1", hb.conf.GetRankFormulaVersion())
// upgrade from < 6.4
config54 := `{"min-hot-byte-rate":100,"min-hot-key-rate":10,"min-hot-query-rate":10,"max-zombie-rounds":5,"max-peer-number":1000,"byte-rate-rank-step-ratio":0.05,"key-rate-rank-step-ratio":0.05,"query-rate-rank-step-ratio":0.05,"count-rank-step-ratio":0.01,"great-dec-ratio":0.95,"minor-dec-ratio":0.99,"src-tolerance-ratio":1.05,"dst-tolerance-ratio":1.05,"read-priorities":["query","byte"],"write-leader-priorities":["query","byte"],"write-peer-priorities":["byte","key"],"strict-picking-store":"true","enable-for-tiflash":"true","forbid-rw-type":"none"}`
sche, err = CreateScheduler(HotRegionType, oc, storage.NewStorageWithMemoryBackend(), ConfigJSONDecoder([]byte(config54)))
re.NoError(err)
hb = sche.(*hotScheduler)
re.Equal([]string{utils.QueryPriority, utils.BytePriority}, hb.conf.GetReadPriorities())
re.Equal([]string{utils.QueryPriority, utils.BytePriority}, hb.conf.GetWriteLeaderPriorities())
re.Equal([]string{utils.BytePriority, utils.KeyPriority}, hb.conf.GetWritePeerPriorities())
re.Equal("v1", hb.conf.GetRankFormulaVersion())
}
func TestGCPendingOpInfos(t *testing.T) {
re := require.New(t)
checkGCPendingOpInfos(re, false /* disable placement rules */)
checkGCPendingOpInfos(re, true /* enable placement rules */)
}
func checkGCPendingOpInfos(re *require.Assertions, enablePlacementRules bool) {
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.Version4_0))
tc.SetEnablePlacementRules(enablePlacementRules)
labels := []string{"zone", "host"}
tc.SetMaxReplicasWithLabel(enablePlacementRules, 3, labels...)
for id := uint64(1); id <= 10; id++ {
tc.PutStoreWithLabels(id)
}
sche, err := CreateScheduler(HotRegionType, oc, storage.NewStorageWithMemoryBackend(), ConfigJSONDecoder([]byte("null")))
re.NoError(err)
hb := sche.(*hotScheduler)
notDoneOpInfluence := func(region *core.RegionInfo, ty opType) *pendingInfluence {
var op *operator.Operator
var err error
switch ty {
case movePeer:
op, err = operator.CreateMovePeerOperator("move-peer-test", tc, region, operator.OpAdmin, 2, &metapb.Peer{Id: region.GetID()*10000 + 1, StoreId: 4})
case transferLeader:
op, err = operator.CreateTransferLeaderOperator("transfer-leader-test", tc, region, 2, []uint64{}, operator.OpAdmin)
}
re.NoError(err)
re.NotNil(op)
op.Start()
op.SetStatusReachTime(operator.CREATED, time.Now().Add(-5*utils.StoreHeartBeatReportInterval*time.Second))
op.SetStatusReachTime(operator.STARTED, time.Now().Add((-5*utils.StoreHeartBeatReportInterval+1)*time.Second))
return newPendingInfluence(op, []uint64{2}, 4, statistics.Influence{}, hb.conf.GetStoreStatZombieDuration())
}
justDoneOpInfluence := func(region *core.RegionInfo, ty opType) *pendingInfluence {
infl := notDoneOpInfluence(region, ty)
infl.op.Cancel(operator.AdminStop)
return infl
}
shouldRemoveOpInfluence := func(region *core.RegionInfo, ty opType) *pendingInfluence {
infl := justDoneOpInfluence(region, ty)
infl.op.SetStatusReachTime(operator.CANCELED, time.Now().Add(-3*utils.StoreHeartBeatReportInterval*time.Second))
return infl
}
opInfluenceCreators := [3]func(region *core.RegionInfo, ty opType) *pendingInfluence{shouldRemoveOpInfluence, notDoneOpInfluence, justDoneOpInfluence}
typs := []opType{movePeer, transferLeader}
for i, creator := range opInfluenceCreators {
for j, typ := range typs {
regionID := uint64(i*len(typs) + j + 1)
region := newTestRegion(regionID)
hb.regionPendings[regionID] = creator(region, typ)
}
}
storeInfos := statistics.SummaryStoreInfos(tc.GetStores())
hb.summaryPendingInfluence(storeInfos) // Calling this function will GC.
for i := range opInfluenceCreators {
for j, typ := range typs {
regionID := uint64(i*len(typs) + j + 1)
if i < 1 { // shouldRemoveOpInfluence
re.NotContains(hb.regionPendings, regionID)
} else { // notDoneOpInfluence, justDoneOpInfluence
re.Contains(hb.regionPendings, regionID)
kind := hb.regionPendings[regionID].op.Kind()
switch typ {
case transferLeader:
re.NotZero(kind & operator.OpLeader)
re.Zero(kind & operator.OpRegion)
case movePeer:
re.Zero(kind & operator.OpLeader)
re.NotZero(kind & operator.OpRegion)
}
}
}
}
}
func TestSplitIfRegionTooHot(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
hb, err := CreateScheduler(utils.Read.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
b := &metapb.Buckets{
RegionId: 1,
PeriodInMs: 1000,
Keys: [][]byte{
[]byte(fmt.Sprintf("%21d", 11)),
[]byte(fmt.Sprintf("%21d", 12)),
[]byte(fmt.Sprintf("%21d", 13)),
[]byte(fmt.Sprintf("%21d", 14)),
[]byte(fmt.Sprintf("%21d", 15)),
},
Stats: &metapb.BucketStats{
ReadBytes: []uint64{10 * units.KiB, 11 * units.KiB, 11 * units.KiB, 10 * units.KiB},
ReadKeys: []uint64{256, 256, 156, 256},
ReadQps: []uint64{0, 0, 0, 0},
WriteBytes: []uint64{100 * units.KiB, 10 * units.KiB, 10 * units.KiB, 10 * units.KiB},
WriteQps: []uint64{256, 256, 156, 256},
WriteKeys: []uint64{0, 0, 0, 0},
},
}
task := buckets.NewCheckPeerTask(b)
re.True(tc.HotBucketCache.CheckAsync(task))
time.Sleep(time.Millisecond * 10)
tc.AddRegionStore(1, 3)
tc.AddRegionStore(2, 2)
tc.AddRegionStore(3, 2)
tc.UpdateStorageReadBytes(1, 6*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageReadBytes(2, 1*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageReadBytes(3, 1*units.MiB*utils.StoreHeartBeatReportInterval)
// Region 1, 2 and 3 are hot regions.
addRegionInfo(tc, utils.Read, []testRegionInfo{
{1, []uint64{1, 2, 3}, 4 * units.MiB, 0, 0},
})
tc.SetRegionBucketEnabled(true)
ops, _ := hb.Schedule(tc, false)
re.Len(ops, 1)
expectOp, _ := operator.CreateSplitRegionOperator(splitHotReadBuckets, tc.GetRegion(1), operator.OpSplit,
pdpb.CheckPolicy_USEKEY, [][]byte{[]byte(fmt.Sprintf("%21d", 13))})
re.Equal(expectOp.Brief(), ops[0].Brief())
re.Equal(expectOp.Kind(), ops[0].Kind())
ops, _ = hb.Schedule(tc, false)
re.Empty(ops)
tc.UpdateStorageWrittenBytes(1, 6*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(2, 1*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(3, 1*units.MiB*utils.StoreHeartBeatReportInterval)
// Region 1, 2 and 3 are hot regions.
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{1, 2, 3}, 4 * units.MiB, 0, 0},
})
hb, _ = CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
hb.(*hotScheduler).types = []resourceType{writePeer}
ops, _ = hb.Schedule(tc, false)
re.Len(ops, 1)
expectOp, _ = operator.CreateSplitRegionOperator(splitHotReadBuckets, tc.GetRegion(1), operator.OpSplit,
pdpb.CheckPolicy_USEKEY, [][]byte{[]byte(fmt.Sprintf("%21d", 12))})
re.Equal(expectOp.Brief(), ops[0].Brief())
re.Equal(expectOp.Kind(), ops[0].Kind())
re.Equal(operator.OpSplit, ops[0].Kind())
ops, _ = hb.Schedule(tc, false)
re.Empty(ops)
}
func TestSplitBucketsBySize(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
tc.SetRegionBucketEnabled(true)
defer cancel()
hb, err := CreateScheduler(utils.Read.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
solve := newBalanceSolver(hb.(*hotScheduler), tc, utils.Read, transferLeader)
solve.cur = &solution{}
region := core.NewTestRegionInfo(1, 1, []byte("a"), []byte("f"))
testdata := []struct {
hotBuckets [][]byte
splitKeys [][]byte
}{
{
[][]byte{[]byte("a"), []byte("b"), []byte("f")},
[][]byte{[]byte("b")},
},
{
[][]byte{[]byte(""), []byte("a"), []byte("")},
nil,
},
{
[][]byte{},
nil,
},
}
for _, data := range testdata {
b := &metapb.Buckets{
RegionId: 1,
PeriodInMs: 1000,
Keys: data.hotBuckets,
}
region.UpdateBuckets(b, region.GetBuckets())
ops := solve.createSplitOperator([]*core.RegionInfo{region}, bySize)
if data.splitKeys == nil {
re.Empty(ops)
continue
}
re.Len(ops, 1)
op := ops[0]
re.Equal(splitHotReadBuckets, op.Desc())
expectOp, err := operator.CreateSplitRegionOperator(splitHotReadBuckets, region, operator.OpSplit, pdpb.CheckPolicy_USEKEY, data.splitKeys)
re.NoError(err)
re.Equal(expectOp.Brief(), op.Brief())
}
}
func TestSplitBucketsByLoad(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
tc.SetRegionBucketEnabled(true)
defer cancel()
hb, err := CreateScheduler(utils.Read.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
solve := newBalanceSolver(hb.(*hotScheduler), tc, utils.Read, transferLeader)
solve.cur = &solution{}
region := core.NewTestRegionInfo(1, 1, []byte("a"), []byte("f"))
testdata := []struct {
hotBuckets [][]byte
splitKeys [][]byte
}{
{
[][]byte{[]byte(""), []byte("b"), []byte("")},
[][]byte{[]byte("b")},
},
{
[][]byte{[]byte(""), []byte("a"), []byte("")},
nil,
},
{
[][]byte{[]byte("b"), []byte("c"), []byte("")},
[][]byte{[]byte("c")},
},
}
for _, data := range testdata {
b := &metapb.Buckets{
RegionId: 1,
PeriodInMs: 1000,
Keys: data.hotBuckets,
Stats: &metapb.BucketStats{
ReadBytes: []uint64{10 * units.KiB, 10 * units.MiB},
ReadKeys: []uint64{256, 256},
ReadQps: []uint64{0, 0},
WriteBytes: []uint64{0, 0},
WriteQps: []uint64{0, 0},
WriteKeys: []uint64{0, 0},
},
}
task := buckets.NewCheckPeerTask(b)
re.True(tc.HotBucketCache.CheckAsync(task))
time.Sleep(time.Millisecond * 10)
ops := solve.createSplitOperator([]*core.RegionInfo{region}, byLoad)
if data.splitKeys == nil {
re.Empty(ops)
continue
}
re.Len(ops, 1)
op := ops[0]
re.Equal(splitHotReadBuckets, op.Desc())
expectOp, err := operator.CreateSplitRegionOperator(splitHotReadBuckets, region, operator.OpSplit, pdpb.CheckPolicy_USEKEY, data.splitKeys)
re.NoError(err)
re.Equal(expectOp.Brief(), op.Brief())
}
}
func TestHotWriteRegionScheduleByteRateOnly(t *testing.T) {
re := require.New(t)
checkHotWriteRegionScheduleByteRateOnly(re, false /* disable placement rules */)
checkHotWriteRegionScheduleByteRateOnly(re, true /* enable placement rules */)
checkHotWriteRegionPlacement(re, true)
}
func checkHotWriteRegionPlacement(re *require.Assertions, enablePlacementRules bool) {
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
tc.SetEnableUseJointConsensus(true)
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.ConfChangeV2))
tc.SetEnablePlacementRules(enablePlacementRules)
labels := []string{"zone", "host"}
tc.SetMaxReplicasWithLabel(enablePlacementRules, 3, labels...)
hb, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb.(*hotScheduler).types = []resourceType{writePeer}
hb.(*hotScheduler).conf.SetHistorySampleDuration(0)
tc.AddLabelsStore(1, 2, map[string]string{"zone": "z1", "host": "h1"})
tc.AddLabelsStore(2, 2, map[string]string{"zone": "z1", "host": "h2"})
tc.AddLabelsStore(3, 2, map[string]string{"zone": "z2", "host": "h3"})
tc.AddLabelsStore(4, 2, map[string]string{"zone": "z2", "host": "h4"})
tc.AddLabelsStore(5, 2, map[string]string{"zone": "z2", "host": "h5"})
tc.AddLabelsStore(6, 2, map[string]string{"zone": "z2", "host": "h6"})
tc.RuleManager.SetRule(&placement.Rule{
GroupID: "pd", ID: "leader", Role: placement.Leader, Count: 1, LabelConstraints: []placement.LabelConstraint{{Key: "zone", Op: "in", Values: []string{"z1"}}},
})
tc.RuleManager.SetRule(&placement.Rule{
GroupID: "pd", ID: "voter", Role: placement.Follower, Count: 2, LabelConstraints: []placement.LabelConstraint{{Key: "zone", Op: "in", Values: []string{"z2"}}},
})
tc.RuleManager.DeleteRule("pd", "default")
tc.UpdateStorageWrittenBytes(1, 10*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(2, 0)
tc.UpdateStorageWrittenBytes(3, 6*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(4, 3*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(5, 3*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(6, 6*units.MiB*utils.StoreHeartBeatReportInterval)
// Region 1, 2 and 3 are hot regions.
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{1, 3, 5}, 512 * units.KiB, 0, 0},
{2, []uint64{1, 4, 6}, 512 * units.KiB, 0, 0},
{3, []uint64{1, 3, 6}, 512 * units.KiB, 0, 0},
})
ops, _ := hb.Schedule(tc, false)
re.NotEmpty(ops)
re.NotContains(ops[0].Step(1).String(), "transfer leader")
operatorutil.CheckTransferPeerWithLeaderTransfer(re, ops[0], operator.OpHotRegion, 1, 2)
clearPendingInfluence(hb.(*hotScheduler))
tc.RuleManager.SetRule(&placement.Rule{
GroupID: "pd", ID: "voter", Role: placement.Voter, Count: 2, LabelConstraints: []placement.LabelConstraint{{Key: "zone", Op: "in", Values: []string{"z2"}}},
})
tc.RuleManager.DeleteRule("pd", "follower")
ops, _ = hb.Schedule(tc, false)
re.NotEmpty(ops)
re.NotContains(ops[0].Step(1).String(), "transfer leader")
operatorutil.CheckTransferPeerWithLeaderTransfer(re, ops[0], operator.OpHotRegion, 1, 2)
}
func checkHotWriteRegionScheduleByteRateOnly(re *require.Assertions, enablePlacementRules bool) {
cancel, opt, tc, oc := prepareSchedulersTest()
defer cancel()
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.ConfChangeV2))
tc.SetEnablePlacementRules(enablePlacementRules)
labels := []string{"zone", "host"}
tc.SetMaxReplicasWithLabel(enablePlacementRules, 3, labels...)
tc.SetHotRegionCacheHitsThreshold(0)
hb, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb.(*hotScheduler).conf.SetHistorySampleDuration(0)
hb.(*hotScheduler).conf.WriteLeaderPriorities = []string{utils.BytePriority, utils.KeyPriority}
// Add stores 1, 2, 3, 4, 5, 6 with region counts 3, 2, 2, 2, 0, 0.
tc.AddLabelsStore(1, 3, map[string]string{"zone": "z1", "host": "h1"})
tc.AddLabelsStore(2, 2, map[string]string{"zone": "z2", "host": "h2"})
tc.AddLabelsStore(3, 2, map[string]string{"zone": "z3", "host": "h3"})
tc.AddLabelsStore(4, 2, map[string]string{"zone": "z4", "host": "h4"})
tc.AddLabelsStore(5, 0, map[string]string{"zone": "z2", "host": "h5"})
tc.AddLabelsStore(6, 0, map[string]string{"zone": "z5", "host": "h6"})
tc.AddLabelsStore(7, 0, map[string]string{"zone": "z5", "host": "h7"})
tc.SetStoreDown(7)
// | store_id | write_bytes_rate |
// |----------|------------------|
// | 1 | 7.5MB |
// | 2 | 4.5MB |
// | 3 | 4.5MB |
// | 4 | 6MB |
// | 5 | 0MB |
// | 6 | 0MB |
tc.UpdateStorageWrittenBytes(1, 7.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(2, 4.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(3, 4.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(4, 6*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(5, 0)
tc.UpdateStorageWrittenBytes(6, 0)
// | region_id | leader_store | follower_store | follower_store | written_bytes |
// |-----------|--------------|----------------|----------------|---------------|
// | 1 | 1 | 2 | 3 | 512KB |
// | 2 | 1 | 3 | 4 | 512KB |
// | 3 | 1 | 2 | 4 | 512KB |
// Region 1, 2 and 3 are hot regions.
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{1, 2, 3}, 512 * units.KiB, 0, 0},
{2, []uint64{1, 3, 4}, 512 * units.KiB, 0, 0},
{3, []uint64{1, 2, 4}, 512 * units.KiB, 0, 0},
})
ops, _ := hb.Schedule(tc, false)
re.NotEmpty(ops)
clearPendingInfluence(hb.(*hotScheduler))
// Will transfer a hot region from store 1, because the total count of peers
// which is hot for store 1 is larger than other stores.
hasLeaderOperator, hasPeerOperator := false, false
for i := 0; i < 20 || !(hasLeaderOperator && hasPeerOperator); i++ {
ops, _ = hb.Schedule(tc, false)
op := ops[0]
clearPendingInfluence(hb.(*hotScheduler))
switch op.Len() {
case 1:
// balance by leader selected
re.Equal("transfer-hot-write-leader", op.Desc())
operatorutil.CheckTransferLeaderFrom(re, op, operator.OpHotRegion, 1)
hasLeaderOperator = true
case 5:
// balance by peer selected
re.Equal("move-hot-write-leader", op.Desc())
if op.RegionID() == 2 {
// peer in store 1 of the region 2 can transfer to store 5 or store 6 because of the label
operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 1, 0)
} else {
// peer in store 1 of the region 1,3 can only transfer to store 6
operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 1, 6)
}
hasPeerOperator = true
default:
re.FailNow("wrong op: " + op.String())
}
}
// hot region scheduler is restricted by `hot-region-schedule-limit`.
tc.SetHotRegionScheduleLimit(0)
re.False(hb.IsScheduleAllowed(tc))
clearPendingInfluence(hb.(*hotScheduler))
tc.SetHotRegionScheduleLimit(int(opt.GetHotRegionScheduleLimit()))
// hot region scheduler is not affect by `balance-region-schedule-limit`.
tc.SetRegionScheduleLimit(0)
ops, _ = hb.Schedule(tc, false)
re.Len(ops, 1)
clearPendingInfluence(hb.(*hotScheduler))
// Always produce operator
ops, _ = hb.Schedule(tc, false)
re.Len(ops, 1)
clearPendingInfluence(hb.(*hotScheduler))
ops, _ = hb.Schedule(tc, false)
re.Len(ops, 1)
clearPendingInfluence(hb.(*hotScheduler))
// | store_id | write_bytes_rate |
// |----------|------------------|
// | 1 | 6MB |
// | 2 | 5MB |
// | 3 | 6MB |
// | 4 | 3.1MB |
// | 5 | 0MB |
// | 6 | 3MB |
tc.UpdateStorageWrittenBytes(1, 6*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(2, 5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(3, 6*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(4, 3.1*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenBytes(5, 0)
tc.UpdateStorageWrittenBytes(6, 3*units.MiB*utils.StoreHeartBeatReportInterval)
// | region_id | leader_store | follower_store | follower_store | written_bytes |
// |-----------|--------------|----------------|----------------|---------------|
// | 1 | 1 | 2 | 3 | 512KB |
// | 2 | 1 | 2 | 3 | 512KB |
// | 3 | 6 | 1 | 4 | 512KB |
// | 4 | 5 | 6 | 4 | 512KB |
// | 5 | 3 | 4 | 5 | 512KB |
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{1, 2, 3}, 512 * units.KiB, 0, 0},
{2, []uint64{1, 2, 3}, 512 * units.KiB, 0, 0},
{3, []uint64{6, 1, 4}, 512 * units.KiB, 0, 0},
{4, []uint64{5, 6, 4}, 512 * units.KiB, 0, 0},
{5, []uint64{3, 4, 5}, 512 * units.KiB, 0, 0},
})
// 6 possible operator.
// Assuming different operators have the same possibility,
// if code has bug, at most 6/7 possibility to success,
// test 30 times, possibility of success < 0.1%.
// Source store is 1 or 3.
// Region 1 and 2 are the same, cannot move peer to store 5 due to the label.
// Region 3 can only move peer to store 5.
// Region 5 can only move peer to store 6.
for i := 0; i < 30; i++ {
ops, _ = hb.Schedule(tc, false)
op := ops[0]
clearPendingInfluence(hb.(*hotScheduler))
switch op.RegionID() {
case 1, 2:
switch op.Len() {
case 1:
operatorutil.CheckTransferLeader(re, op, operator.OpHotRegion, 1, 2)
case 3:
operatorutil.CheckTransferPeer(re, op, operator.OpHotRegion, 3, 6)
case 4:
operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 1, 6)
default:
re.FailNow("wrong operator: " + op.String())
}
case 3:
operatorutil.CheckTransferPeer(re, op, operator.OpHotRegion, 1, 5)
case 5:
operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 3, 6)
default:
re.FailNow("wrong operator: " + op.String())
}
}
// Should not panic if region not found.
for i := uint64(1); i <= 3; i++ {
r := tc.GetRegion(i)
tc.RemoveRegion(r)
tc.RemoveRegionFromSubTree(r)
}
hb.Schedule(tc, false)
clearPendingInfluence(hb.(*hotScheduler))
}
func TestHotWriteRegionScheduleByteRateOnlyWithTiFlash(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.ConfChangeV2))
re.NoError(tc.RuleManager.SetRules([]*placement.Rule{
{
GroupID: placement.DefaultGroupID,
ID: placement.DefaultRuleID,
Role: placement.Voter,
Count: 3,
LocationLabels: []string{"zone", "host"},
},
{
GroupID: "tiflash",
ID: "tiflash",
Role: placement.Learner,
Count: 1,
LocationLabels: []string{"zone", "host"},
LabelConstraints: []placement.LabelConstraint{
{
Key: core.EngineKey,
Op: placement.In,
Values: []string{core.EngineTiFlash},
},
},
},
}))
sche, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb := sche.(*hotScheduler)
hb.conf.SetHistorySampleDuration(0)
// Add TiKV stores 1, 2, 3, 4, 5, 6, 7 (Down) with region counts 3, 3, 2, 2, 0, 0, 0.
// Add TiFlash stores 8, 9, 10 with region counts 2, 1, 1.
storeCount := uint64(10)
aliveTiKVStartID := uint64(1)
aliveTiKVLastID := uint64(6)
aliveTiFlashStartID := uint64(8)
aliveTiFlashLastID := uint64(10)
downStoreID := uint64(7)
tc.AddLabelsStore(1, 3, map[string]string{"zone": "z1", "host": "h1"})
tc.AddLabelsStore(2, 3, map[string]string{"zone": "z2", "host": "h2"})
tc.AddLabelsStore(3, 2, map[string]string{"zone": "z3", "host": "h3"})
tc.AddLabelsStore(4, 2, map[string]string{"zone": "z4", "host": "h4"})
tc.AddLabelsStore(5, 0, map[string]string{"zone": "z2", "host": "h5"})
tc.AddLabelsStore(6, 0, map[string]string{"zone": "z5", "host": "h6"})
tc.AddLabelsStore(7, 0, map[string]string{"zone": "z5", "host": "h7"})
tc.AddLabelsStore(8, 3, map[string]string{"zone": "z1", "host": "h8", "engine": "tiflash"})
tc.AddLabelsStore(9, 1, map[string]string{"zone": "z2", "host": "h9", "engine": "tiflash"})
tc.AddLabelsStore(10, 1, map[string]string{"zone": "z5", "host": "h10", "engine": "tiflash"})
tc.SetStoreDown(downStoreID)
for i := uint64(1); i <= storeCount; i++ {
if i != downStoreID {
tc.UpdateStorageWrittenBytes(i, 0)
}
}
// | region_id | leader_store | follower_store | follower_store | learner_store | written_bytes |
// |-----------|--------------|----------------|----------------|---------------|---------------|
// | 1 | 1 | 2 | 3 | 8 | 512 KB |
// | 2 | 1 | 3 | 4 | 8 | 512 KB |
// | 3 | 1 | 2 | 4 | 9 | 512 KB |
// | 4 | 2 | | | 10 | 100 B |
// Region 1, 2 and 3 are hot regions.
testRegions := []testRegionInfo{
{1, []uint64{1, 2, 3, 8}, 512 * units.KiB, 5 * units.KiB, 3000},
{2, []uint64{1, 3, 4, 8}, 512 * units.KiB, 5 * units.KiB, 3000},
{3, []uint64{1, 2, 4, 9}, 512 * units.KiB, 5 * units.KiB, 3000},
{4, []uint64{2, 10}, 100, 1, 1},
}
addRegionInfo(tc, utils.Write, testRegions)
regionBytesSum := 0.0
regionKeysSum := 0.0
regionQuerySum := 0.0
hotRegionBytesSum := 0.0
hotRegionKeysSum := 0.0
hotRegionQuerySum := 0.0
for _, r := range testRegions {
regionBytesSum += r.byteRate
regionKeysSum += r.keyRate
regionQuerySum += r.queryRate
}
for _, r := range testRegions[0:3] {
hotRegionBytesSum += r.byteRate
hotRegionKeysSum += r.keyRate
hotRegionQuerySum += r.queryRate
}
// Will transfer a hot learner from store 8, because the total count of peers
// which is hot for store 8 is larger than other TiFlash stores.
pdServerCfg := tc.GetPDServerConfig()
pdServerCfg.FlowRoundByDigit = 6
hasLeaderOperator, hasPeerOperator := false, false
for i := 0; i < 20 || !(hasLeaderOperator && hasPeerOperator); i++ {
clearPendingInfluence(hb)
ops, _ := hb.Schedule(tc, false)
op := ops[0]
switch op.Len() {
case 1:
// balance by leader selected
re.Equal("transfer-hot-write-leader", op.Desc())
operatorutil.CheckTransferLeaderFrom(re, op, operator.OpHotRegion, 1)
hasLeaderOperator = true
case 2:
// balance by peer selected
re.Equal("move-hot-write-peer", op.Desc())
operatorutil.CheckTransferLearner(re, op, operator.OpHotRegion, 8, 10)
hasPeerOperator = true
default:
re.FailNow("wrong op: " + op.String())
}
}
pdServerCfg.FlowRoundByDigit = 3
// Disable for TiFlash
hb.conf.SetEnableForTiFlash(false)
for i := 0; i < 20; i++ {
clearPendingInfluence(hb)
ops, _ := hb.Schedule(tc, false)
if len(ops) == 0 {
continue
}
operatorutil.CheckTransferLeaderFrom(re, ops[0], operator.OpHotRegion, 1)
}
// | store_id | write_bytes_rate |
// |----------|------------------|
// | 1 | 7.5MB |
// | 2 | 4.5MB |
// | 3 | 4.5MB |
// | 4 | 6MB |
// | 5 | 0MB(Evict)|
// | 6 | 0MB |
// | 7 | n/a (Down)|
// | 8 | n/a | <- TiFlash is always 0.
// | 9 | n/a |
// | 10 | n/a |
storesBytes := map[uint64]uint64{
1: 7.5 * units.MiB * utils.StoreHeartBeatReportInterval,
2: 4.5 * units.MiB * utils.StoreHeartBeatReportInterval,
3: 4.5 * units.MiB * utils.StoreHeartBeatReportInterval,
4: 6 * units.MiB * utils.StoreHeartBeatReportInterval,
}
tc.SetStoreEvictLeader(5, true)
tikvBytesSum, tikvKeysSum, tikvQuerySum := 0.0, 0.0, 0.0
for i := aliveTiKVStartID; i <= aliveTiKVLastID; i++ {
tikvBytesSum += float64(storesBytes[i]) / 10
tikvKeysSum += float64(storesBytes[i]/100) / 10
tikvQuerySum += float64(storesBytes[i]/100) / 10
}
for i := uint64(1); i <= storeCount; i++ {
if i != downStoreID {
tc.UpdateStorageWrittenBytes(i, storesBytes[i])
}
}
{ // Check the load expect
aliveTiKVCount := float64(aliveTiKVLastID - aliveTiKVStartID + 1)
allowLeaderTiKVCount := aliveTiKVCount - 1 // store 5 with evict leader
aliveTiFlashCount := float64(aliveTiFlashLastID - aliveTiFlashStartID + 1)
tc.ObserveRegionsStats()
testutil.Eventually(re, func() bool {
ops, _ := hb.Schedule(tc, false)
return len(ops) != 0
})
re.True(
loadsEqual(
hb.stLoadInfos[writeLeader][1].LoadPred.Expect.Loads,
[]float64{hotRegionBytesSum / allowLeaderTiKVCount, hotRegionKeysSum / allowLeaderTiKVCount, tikvQuerySum / allowLeaderTiKVCount}))
re.NotEqual(tikvQuerySum, hotRegionQuerySum)
re.True(
loadsEqual(
hb.stLoadInfos[writePeer][1].LoadPred.Expect.Loads,
[]float64{tikvBytesSum / aliveTiKVCount, tikvKeysSum / aliveTiKVCount, 0}))
re.True(
loadsEqual(
hb.stLoadInfos[writePeer][8].LoadPred.Expect.Loads,
[]float64{regionBytesSum / aliveTiFlashCount, regionKeysSum / aliveTiFlashCount, 0}))
// check IsTraceRegionFlow == false
pdServerCfg := tc.GetPDServerConfig()
pdServerCfg.FlowRoundByDigit = 8
tc.SetPDServerConfig(pdServerCfg)
clearPendingInfluence(hb)
testutil.Eventually(re, func() bool {
ops, _ := hb.Schedule(tc, false)
return len(ops) != 0
})
re.True(
loadsEqual(
hb.stLoadInfos[writePeer][8].LoadPred.Expect.Loads,
[]float64{hotRegionBytesSum / aliveTiFlashCount, hotRegionKeysSum / aliveTiFlashCount, 0}))
// revert
pdServerCfg.FlowRoundByDigit = 3
tc.SetPDServerConfig(pdServerCfg)
}
// Will transfer a hot region from store 1, because the total count of peers
// which is hot for store 1 is larger than other stores.
for i := 0; i < 20; i++ {
clearPendingInfluence(hb)
ops, _ := hb.Schedule(tc, false)
op := ops[0]
switch op.Len() {
case 1:
// balance by leader selected
re.Equal("transfer-hot-write-leader", op.Desc())
operatorutil.CheckTransferLeaderFrom(re, op, operator.OpHotRegion, 1)
case 5:
// balance by peer selected
re.Equal("move-hot-write-leader", op.Desc())
if op.RegionID() == 2 {
// peer in store 1 of the region 2 can transfer to store 5 or store 6 because of the label
operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 1, 0)
} else {
// peer in store 1 of the region 1,3 can only transfer to store 6
operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 1, 6)
}
default:
re.FailNow("wrong op: " + op.String())
}
}
}
func TestHotWriteRegionScheduleWithQuery(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
hb, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb.(*hotScheduler).conf.SetSrcToleranceRatio(1)
hb.(*hotScheduler).conf.SetDstToleranceRatio(1)
hb.(*hotScheduler).conf.WriteLeaderPriorities = []string{utils.QueryPriority, utils.BytePriority}
hb.(*hotScheduler).conf.SetHistorySampleDuration(0)
tc.AddRegionStore(1, 20)
tc.AddRegionStore(2, 20)
tc.AddRegionStore(3, 20)
tc.UpdateStorageWriteQuery(1, 11000*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWriteQuery(2, 10000*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWriteQuery(3, 9000*utils.StoreHeartBeatReportInterval)
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{1, 2, 3}, 500, 0, 500},
{2, []uint64{1, 2, 3}, 500, 0, 500},
{3, []uint64{2, 1, 3}, 500, 0, 500},
})
for i := 0; i < 100; i++ {
clearPendingInfluence(hb.(*hotScheduler))
ops, _ := hb.Schedule(tc, false)
if len(ops) == 0 {
continue
}
operatorutil.CheckTransferLeader(re, ops[0], operator.OpHotRegion, 1, 3)
}
}
func TestHotWriteRegionScheduleWithKeyRate(t *testing.T) {
// This test is used to test move peer.
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
hb, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb.(*hotScheduler).types = []resourceType{writePeer}
hb.(*hotScheduler).conf.SetDstToleranceRatio(1)
hb.(*hotScheduler).conf.SetSrcToleranceRatio(1)
hb.(*hotScheduler).conf.WriteLeaderPriorities = []string{utils.KeyPriority, utils.BytePriority}
hb.(*hotScheduler).conf.RankFormulaVersion = "v1"
hb.(*hotScheduler).conf.SetHistorySampleDuration(0)
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.Version4_0))
tc.AddRegionStore(1, 20)
tc.AddRegionStore(2, 20)
tc.AddRegionStore(3, 20)
tc.AddRegionStore(4, 20)
tc.AddRegionStore(5, 20)
tc.UpdateStorageWrittenStats(1, 10.5*units.MiB*utils.StoreHeartBeatReportInterval, 10.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(2, 9.5*units.MiB*utils.StoreHeartBeatReportInterval, 9.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(3, 9.5*units.MiB*utils.StoreHeartBeatReportInterval, 9.8*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(4, 9*units.MiB*utils.StoreHeartBeatReportInterval, 9*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(5, 8.9*units.MiB*utils.StoreHeartBeatReportInterval, 9.2*units.MiB*utils.StoreHeartBeatReportInterval)
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{2, 1, 3}, 0.5 * units.MiB, 0.5 * units.MiB, 0},
{2, []uint64{2, 1, 3}, 0.5 * units.MiB, 0.5 * units.MiB, 0},
{3, []uint64{2, 4, 3}, 0.05 * units.MiB, 0.1 * units.MiB, 0},
})
for i := 0; i < 100; i++ {
clearPendingInfluence(hb.(*hotScheduler))
ops, _ := hb.Schedule(tc, false)
op := ops[0]
// byteDecRatio <= 0.95 && keyDecRatio <= 0.95
operatorutil.CheckTransferPeer(re, op, operator.OpHotRegion, 1, 4)
// store byte rate (min, max): (10, 10.5) | 9.5 | 9.5 | (9, 9.5) | 8.9
// store key rate (min, max): (10, 10.5) | 9.5 | 9.8 | (9, 9.5) | 9.2
ops, _ = hb.Schedule(tc, false)
op = ops[0]
// byteDecRatio <= 0.99 && keyDecRatio <= 0.95
operatorutil.CheckTransferPeer(re, op, operator.OpHotRegion, 3, 5)
// store byte rate (min, max): (10, 10.5) | 9.5 | (9.45, 9.5) | (9, 9.5) | (8.9, 8.95)
// store key rate (min, max): (10, 10.5) | 9.5 | (9.7, 9.8) | (9, 9.5) | (9.2, 9.3)
// byteDecRatio <= 0.95
// op = hb.Schedule(tc, false)[0]
// FIXME: cover this case
// operatorutil.CheckTransferPeerWithLeaderTransfer(re, op, operator.OpHotRegion, 1, 5)
// store byte rate (min, max): (9.5, 10.5) | 9.5 | (9.45, 9.5) | (9, 9.5) | (8.9, 9.45)
// store key rate (min, max): (9.2, 10.2) | 9.5 | (9.7, 9.8) | (9, 9.5) | (9.2, 9.8)
}
}
func TestHotWriteRegionScheduleUnhealthyStore(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
hb, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb.(*hotScheduler).conf.SetDstToleranceRatio(1)
hb.(*hotScheduler).conf.SetSrcToleranceRatio(1)
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.Version4_0))
tc.AddRegionStore(1, 20)
tc.AddRegionStore(2, 20)
tc.AddRegionStore(3, 20)
tc.AddRegionStore(4, 20)
tc.UpdateStorageWrittenStats(1, 10.5*units.MiB*utils.StoreHeartBeatReportInterval, 10.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(2, 10*units.MiB*utils.StoreHeartBeatReportInterval, 10*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(3, 9.5*units.MiB*utils.StoreHeartBeatReportInterval, 9.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(4, 0*units.MiB*utils.StoreHeartBeatReportInterval, 0*units.MiB*utils.StoreHeartBeatReportInterval)
addRegionInfo(tc, utils.Write, []testRegionInfo{
{1, []uint64{1, 2, 3}, 0.5 * units.MiB, 0.5 * units.MiB, 0},
{2, []uint64{2, 1, 3}, 0.5 * units.MiB, 0.5 * units.MiB, 0},
{3, []uint64{3, 2, 1}, 0.5 * units.MiB, 0.5 * units.MiB, 0},
})
intervals := []time.Duration{
9 * time.Second,
10 * time.Second,
19 * time.Second,
20 * time.Second,
9 * time.Minute,
10 * time.Minute,
29 * time.Minute,
30 * time.Minute,
}
// test dst
for _, interval := range intervals {
tc.SetStoreLastHeartbeatInterval(4, interval)
clearPendingInfluence(hb.(*hotScheduler))
hb.Schedule(tc, false)
// no panic
}
}
func TestHotWriteRegionScheduleCheckHot(t *testing.T) {
re := require.New(t)
cancel, _, tc, oc := prepareSchedulersTest()
defer cancel()
hb, err := CreateScheduler(utils.Write.String(), oc, storage.NewStorageWithMemoryBackend(), nil)
re.NoError(err)
hb.(*hotScheduler).conf.SetDstToleranceRatio(1)
hb.(*hotScheduler).conf.SetSrcToleranceRatio(1)
tc.SetClusterVersion(versioninfo.MinSupportedVersion(versioninfo.Version4_0))
tc.AddRegionStore(1, 20)
tc.AddRegionStore(2, 20)
tc.AddRegionStore(3, 20)
tc.AddRegionStore(4, 20)
tc.AddRegionStore(5, 20)
tc.UpdateStorageWrittenStats(1, 10.5*units.MiB*utils.StoreHeartBeatReportInterval, 10.5*units.MiB*utils.StoreHeartBeatReportInterval)
tc.UpdateStorageWrittenStats(2, 10.5*units.MiB*utils.StoreHeartBeatReportInterval, 10.5*units.MiB*utils.StoreHeartBeatReportInterval)