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balance_test.go
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balance_test.go
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// Copyright 2017 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 (
"context"
"fmt"
"math"
"math/rand"
. "github.com/pingcap/check"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/tikv/pd/pkg/mock/mockcluster"
"github.com/tikv/pd/pkg/testutil"
"github.com/tikv/pd/server/config"
"github.com/tikv/pd/server/core"
"github.com/tikv/pd/server/kv"
"github.com/tikv/pd/server/schedule"
"github.com/tikv/pd/server/schedule/hbstream"
"github.com/tikv/pd/server/schedule/operator"
"github.com/tikv/pd/server/versioninfo"
)
var _ = Suite(&testBalanceSuite{})
type testBalanceSuite struct {
ctx context.Context
cancel context.CancelFunc
}
func (s *testBalanceSuite) SetUpSuite(c *C) {
s.ctx, s.cancel = context.WithCancel(context.Background())
}
func (s *testBalanceSuite) TearDownTest(c *C) {
s.cancel()
}
type testBalanceSpeedCase struct {
sourceCount uint64
targetCount uint64
regionSize int64
expectedResult bool
kind core.SchedulePolicy
}
func (s *testBalanceSuite) TestShouldBalance(c *C) {
// store size = 100GiB
// region size = 96MiB
const R = 96
tests := []testBalanceSpeedCase{
// target size is zero
{2, 0, R / 10, true, core.BySize},
{2, 0, R, false, core.BySize},
// all in high space stage
{10, 5, R / 10, true, core.BySize},
{10, 5, 2 * R, false, core.BySize},
{10, 10, R / 10, false, core.BySize},
{10, 10, 2 * R, false, core.BySize},
// all in transition stage
{700, 680, R / 10, true, core.BySize},
{700, 680, 5 * R, false, core.BySize},
{700, 700, R / 10, false, core.BySize},
// all in low space stage
{900, 890, R / 10, true, core.BySize},
{900, 890, 5 * R, false, core.BySize},
{900, 900, R / 10, false, core.BySize},
// one in high space stage, other in transition stage
{650, 550, R, true, core.BySize},
{650, 500, 50 * R, false, core.BySize},
// one in transition space stage, other in low space stage
{800, 700, R, true, core.BySize},
{800, 700, 50 * R, false, core.BySize},
// default leader tolerant ratio is 5, when schedule by count
// target size is zero
{2, 0, R / 10, false, core.ByCount},
{2, 0, R, false, core.ByCount},
// all in high space stage
{10, 5, R / 10, true, core.ByCount},
{10, 5, 2 * R, true, core.ByCount},
{10, 6, 2 * R, false, core.ByCount},
{10, 10, R / 10, false, core.ByCount},
{10, 10, 2 * R, false, core.ByCount},
// all in transition stage
{70, 50, R / 10, true, core.ByCount},
{70, 50, 5 * R, true, core.ByCount},
{70, 70, R / 10, false, core.ByCount},
// all in low space stage
{90, 80, R / 10, true, core.ByCount},
{90, 80, 5 * R, true, core.ByCount},
{90, 90, R / 10, false, core.ByCount},
// one in high space stage, other in transition stage
{65, 55, R / 2, true, core.ByCount},
{65, 50, 5 * R, true, core.ByCount},
// one in transition space stage, other in low space stage
{80, 70, R / 2, true, core.ByCount},
{80, 70, 5 * R, true, core.ByCount},
}
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
tc.SetTolerantSizeRatio(2.5)
tc.SetRegionScoreFormulaVersion("v1")
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
oc := schedule.NewOperatorController(ctx, nil, nil)
// create a region to control average region size.
tc.AddLeaderRegion(1, 1, 2)
for _, t := range tests {
tc.AddLeaderStore(1, int(t.sourceCount))
tc.AddLeaderStore(2, int(t.targetCount))
region := tc.GetRegion(1).Clone(core.SetApproximateSize(t.regionSize))
tc.PutRegion(region)
tc.SetLeaderSchedulePolicy(t.kind.String())
kind := core.NewScheduleKind(core.LeaderKind, t.kind)
plan := newBalancePlan(kind, tc, oc.GetOpInfluence(tc))
plan.source, plan.target, plan.region = tc.GetStore(1), tc.GetStore(2), tc.GetRegion(1)
c.Assert(plan.shouldBalance(""), Equals, t.expectedResult)
}
for _, t := range tests {
if t.kind.String() == core.BySize.String() {
tc.AddRegionStore(1, int(t.sourceCount))
tc.AddRegionStore(2, int(t.targetCount))
region := tc.GetRegion(1).Clone(core.SetApproximateSize(t.regionSize))
tc.PutRegion(region)
kind := core.NewScheduleKind(core.RegionKind, t.kind)
plan := newBalancePlan(kind, tc, oc.GetOpInfluence(tc))
plan.source, plan.target, plan.region = tc.GetStore(1), tc.GetStore(2), tc.GetRegion(1)
c.Assert(plan.shouldBalance(""), Equals, t.expectedResult)
}
}
}
func (s *testBalanceSuite) TestBalanceLimit(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
tc.AddLeaderStore(1, 10)
tc.AddLeaderStore(2, 20)
tc.AddLeaderStore(3, 30)
// StandDeviation is sqrt((10^2+0+10^2)/3).
c.Assert(adjustBalanceLimit(tc, core.LeaderKind), Equals, uint64(math.Sqrt(200.0/3.0)))
tc.SetStoreOffline(1)
// StandDeviation is sqrt((5^2+5^2)/2).
c.Assert(adjustBalanceLimit(tc, core.LeaderKind), Equals, uint64(math.Sqrt(50.0/2.0)))
}
func (s *testBalanceSuite) TestTolerantRatio(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
// create a region to control average region size.
c.Assert(tc.AddLeaderRegion(1, 1, 2), NotNil)
regionSize := int64(96 * KB)
region := tc.GetRegion(1).Clone(core.SetApproximateSize(regionSize))
tbl := []struct {
ratio float64
kind core.ScheduleKind
expectTolerantResource func(core.ScheduleKind) int64
}{
{0, core.ScheduleKind{Resource: core.LeaderKind, Policy: core.ByCount}, func(k core.ScheduleKind) int64 {
return int64(leaderTolerantSizeRatio)
}},
{0, core.ScheduleKind{Resource: core.LeaderKind, Policy: core.BySize}, func(k core.ScheduleKind) int64 {
return int64(adjustTolerantRatio(tc, k) * float64(regionSize))
}},
{0, core.ScheduleKind{Resource: core.RegionKind, Policy: core.ByCount}, func(k core.ScheduleKind) int64 {
return int64(adjustTolerantRatio(tc, k) * float64(regionSize))
}},
{0, core.ScheduleKind{Resource: core.RegionKind, Policy: core.BySize}, func(k core.ScheduleKind) int64 {
return int64(adjustTolerantRatio(tc, k) * float64(regionSize))
}},
{10, core.ScheduleKind{Resource: core.LeaderKind, Policy: core.ByCount}, func(k core.ScheduleKind) int64 {
return int64(tc.GetScheduleConfig().TolerantSizeRatio)
}},
{10, core.ScheduleKind{Resource: core.LeaderKind, Policy: core.BySize}, func(k core.ScheduleKind) int64 {
return int64(adjustTolerantRatio(tc, k) * float64(regionSize))
}},
{10, core.ScheduleKind{Resource: core.RegionKind, Policy: core.ByCount}, func(k core.ScheduleKind) int64 {
return int64(adjustTolerantRatio(tc, k) * float64(regionSize))
}},
{10, core.ScheduleKind{Resource: core.RegionKind, Policy: core.BySize}, func(k core.ScheduleKind) int64 {
return int64(adjustTolerantRatio(tc, k) * float64(regionSize))
}},
}
for i, t := range tbl {
tc.SetTolerantSizeRatio(t.ratio)
plan := newBalancePlan(t.kind, tc, operator.OpInfluence{})
plan.region = region
c.Assert(plan.getTolerantResource(), Equals, t.expectTolerantResource(t.kind), Commentf("case #%d", i+1))
}
}
var _ = Suite(&testBalanceLeaderSchedulerSuite{})
type testBalanceLeaderSchedulerSuite struct {
ctx context.Context
cancel context.CancelFunc
tc *mockcluster.Cluster
lb schedule.Scheduler
oc *schedule.OperatorController
opt *config.PersistOptions
}
func (s *testBalanceLeaderSchedulerSuite) SetUpTest(c *C) {
s.ctx, s.cancel = context.WithCancel(context.Background())
s.opt = config.NewTestOptions()
s.tc = mockcluster.NewCluster(s.ctx, s.opt)
s.oc = schedule.NewOperatorController(s.ctx, s.tc, nil)
lb, err := schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"", ""}))
c.Assert(err, IsNil)
s.lb = lb
}
func (s *testBalanceLeaderSchedulerSuite) TearDownTest(c *C) {
s.cancel()
}
func (s *testBalanceLeaderSchedulerSuite) schedule() []*operator.Operator {
return s.lb.Schedule(s.tc)
}
func (s *testBalanceLeaderSchedulerSuite) TestBalanceLimit(c *C) {
s.tc.SetTolerantSizeRatio(2.5)
// Stores: 1 2 3 4
// Leaders: 1 0 0 0
// Region1: L F F F
s.tc.AddLeaderStore(1, 1)
s.tc.AddLeaderStore(2, 0)
s.tc.AddLeaderStore(3, 0)
s.tc.AddLeaderStore(4, 0)
s.tc.AddLeaderRegion(1, 1, 2, 3, 4)
c.Check(s.schedule(), IsNil)
// Stores: 1 2 3 4
// Leaders: 16 0 0 0
// Region1: L F F F
s.tc.UpdateLeaderCount(1, 16)
c.Check(s.schedule(), NotNil)
// Stores: 1 2 3 4
// Leaders: 7 8 9 10
// Region1: F F F L
s.tc.UpdateLeaderCount(1, 7)
s.tc.UpdateLeaderCount(2, 8)
s.tc.UpdateLeaderCount(3, 9)
s.tc.UpdateLeaderCount(4, 10)
s.tc.AddLeaderRegion(1, 4, 1, 2, 3)
c.Check(s.schedule(), IsNil)
// Stores: 1 2 3 4
// Leaders: 7 8 9 16
// Region1: F F F L
s.tc.UpdateLeaderCount(4, 16)
c.Check(s.schedule(), NotNil)
}
func (s *testBalanceLeaderSchedulerSuite) TestBalanceLeaderSchedulePolicy(c *C) {
// Stores: 1 2 3 4
// Leader Count: 10 10 10 10
// Leader Size : 10000 100 100 100
// Region1: L F F F
s.tc.AddLeaderStore(1, 10, 10000*MB)
s.tc.AddLeaderStore(2, 10, 100*MB)
s.tc.AddLeaderStore(3, 10, 100*MB)
s.tc.AddLeaderStore(4, 10, 100*MB)
s.tc.AddLeaderRegion(1, 1, 2, 3, 4)
c.Assert(s.tc.GetScheduleConfig().LeaderSchedulePolicy, Equals, core.ByCount.String()) // default by count
c.Check(s.schedule(), IsNil)
s.tc.SetLeaderSchedulePolicy(core.BySize.String())
c.Check(s.schedule(), NotNil)
}
func (s *testBalanceLeaderSchedulerSuite) TestBalanceLeaderTolerantRatio(c *C) {
s.tc.SetTolerantSizeRatio(2.5)
// test schedule leader by count, with tolerantSizeRatio=2.5
// Stores: 1 2 3 4
// Leader Count: 14->15 10 10 10
// Leader Size : 100 100 100 100
// Region1: L F F F
s.tc.AddLeaderStore(1, 14, 100)
s.tc.AddLeaderStore(2, 10, 100)
s.tc.AddLeaderStore(3, 10, 100)
s.tc.AddLeaderStore(4, 10, 100)
s.tc.AddLeaderRegion(1, 1, 2, 3, 4)
c.Assert(s.tc.GetScheduleConfig().LeaderSchedulePolicy, Equals, core.ByCount.String()) // default by count
c.Check(s.schedule(), IsNil)
c.Assert(s.tc.GetStore(1).GetLeaderCount(), Equals, 14)
s.tc.AddLeaderStore(1, 15, 100)
c.Assert(s.tc.GetStore(1).GetLeaderCount(), Equals, 15)
c.Check(s.schedule(), NotNil)
s.tc.SetTolerantSizeRatio(6) // (15-10)<6
c.Check(s.schedule(), IsNil)
}
func (s *testBalanceLeaderSchedulerSuite) TestScheduleWithOpInfluence(c *C) {
s.tc.SetTolerantSizeRatio(2.5)
// Stores: 1 2 3 4
// Leaders: 7 8 9 14
// Region1: F F F L
s.tc.AddLeaderStore(1, 7)
s.tc.AddLeaderStore(2, 8)
s.tc.AddLeaderStore(3, 9)
s.tc.AddLeaderStore(4, 14)
s.tc.AddLeaderRegion(1, 4, 1, 2, 3)
op := s.schedule()[0]
c.Check(op, NotNil)
s.oc.SetOperator(op)
// After considering the scheduled operator, leaders of store1 and store4 are 8
// and 13 respectively. As the `TolerantSizeRatio` is 2.5, `shouldBalance`
// returns false when leader difference is not greater than 5.
c.Assert(s.tc.GetScheduleConfig().LeaderSchedulePolicy, Equals, core.ByCount.String()) // default by count
c.Check(s.schedule(), NotNil)
s.tc.SetLeaderSchedulePolicy(core.BySize.String())
c.Check(s.schedule(), IsNil)
// Stores: 1 2 3 4
// Leaders: 8 8 9 13
// Region1: F F F L
s.tc.UpdateLeaderCount(1, 8)
s.tc.UpdateLeaderCount(2, 8)
s.tc.UpdateLeaderCount(3, 9)
s.tc.UpdateLeaderCount(4, 13)
s.tc.AddLeaderRegion(1, 4, 1, 2, 3)
c.Check(s.schedule(), IsNil)
}
func (s *testBalanceLeaderSchedulerSuite) TestTransferLeaderOut(c *C) {
// Stores: 1 2 3 4
// Leaders: 7 8 9 12
s.tc.AddLeaderStore(1, 7)
s.tc.AddLeaderStore(2, 8)
s.tc.AddLeaderStore(3, 9)
s.tc.AddLeaderStore(4, 12)
s.tc.SetTolerantSizeRatio(0.1)
for i := uint64(1); i <= 7; i++ {
s.tc.AddLeaderRegion(i, 4, 1, 2, 3)
}
// balance leader: 4->1, 4->1, 4->2
regions := make(map[uint64]struct{})
targets := map[uint64]uint64{
1: 2,
2: 1,
}
for i := 0; i < 20; i++ {
if len(s.schedule()) == 0 {
continue
}
if op := s.schedule()[0]; op != nil {
if _, ok := regions[op.RegionID()]; !ok {
s.oc.SetOperator(op)
regions[op.RegionID()] = struct{}{}
tr := op.Step(0).(operator.TransferLeader)
c.Assert(tr.FromStore, Equals, uint64(4))
targets[tr.ToStore]--
}
}
}
c.Assert(regions, HasLen, 3)
for _, count := range targets {
c.Assert(count, Equals, uint64(0))
}
}
func (s *testBalanceLeaderSchedulerSuite) TestBalanceFilter(c *C) {
// Stores: 1 2 3 4
// Leaders: 1 2 3 16
// Region1: F F F L
s.tc.AddLeaderStore(1, 1)
s.tc.AddLeaderStore(2, 2)
s.tc.AddLeaderStore(3, 3)
s.tc.AddLeaderStore(4, 16)
s.tc.AddLeaderRegion(1, 4, 1, 2, 3)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 4, 1)
// Test stateFilter.
// if store 4 is offline, we should consider it
// because it still provides services
s.tc.SetStoreOffline(4)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 4, 1)
// If store 1 is down, it will be filtered,
// store 2 becomes the store with least leaders.
s.tc.SetStoreDown(1)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 4, 2)
// Test healthFilter.
// If store 2 is busy, it will be filtered,
// store 3 becomes the store with least leaders.
s.tc.SetStoreBusy(2, true)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 4, 3)
// Test disconnectFilter.
// If store 3 is disconnected, no operator can be created.
s.tc.SetStoreDisconnect(3)
c.Assert(s.schedule(), HasLen, 0)
}
func (s *testBalanceLeaderSchedulerSuite) TestLeaderWeight(c *C) {
// Stores: 1 2 3 4
// Leaders: 10 10 10 10
// Weight: 0.5 0.9 1 2
// Region1: L F F F
s.tc.SetTolerantSizeRatio(2.5)
for i := uint64(1); i <= 4; i++ {
s.tc.AddLeaderStore(i, 10)
}
s.tc.UpdateStoreLeaderWeight(1, 0.5)
s.tc.UpdateStoreLeaderWeight(2, 0.9)
s.tc.UpdateStoreLeaderWeight(3, 1)
s.tc.UpdateStoreLeaderWeight(4, 2)
s.tc.AddLeaderRegion(1, 1, 2, 3, 4)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 1, 4)
s.tc.UpdateLeaderCount(4, 30)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 1, 3)
}
func (s *testBalanceLeaderSchedulerSuite) TestBalancePolicy(c *C) {
// Stores: 1 2 3 4
// LeaderCount: 20 66 6 20
// LeaderSize: 66 20 20 6
s.tc.AddLeaderStore(1, 20, 600*MB)
s.tc.AddLeaderStore(2, 66, 200*MB)
s.tc.AddLeaderStore(3, 6, 20*MB)
s.tc.AddLeaderStore(4, 20, 1*MB)
s.tc.AddLeaderRegion(1, 2, 1, 3, 4)
s.tc.AddLeaderRegion(2, 1, 2, 3, 4)
s.tc.SetLeaderSchedulePolicy("count")
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 2, 3)
s.tc.SetLeaderSchedulePolicy("size")
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 1, 4)
}
func (s *testBalanceLeaderSchedulerSuite) TestBalanceSelector(c *C) {
// Stores: 1 2 3 4
// Leaders: 1 2 3 16
// Region1: - F F L
// Region2: F F L -
s.tc.AddLeaderStore(1, 1)
s.tc.AddLeaderStore(2, 2)
s.tc.AddLeaderStore(3, 3)
s.tc.AddLeaderStore(4, 16)
s.tc.AddLeaderRegion(1, 4, 2, 3)
s.tc.AddLeaderRegion(2, 3, 1, 2)
// store4 has max leader score, store1 has min leader score.
// The scheduler try to move a leader out of 16 first.
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 4, 2)
// Stores: 1 2 3 4
// Leaders: 1 14 15 16
// Region1: - F F L
// Region2: F F L -
s.tc.UpdateLeaderCount(2, 14)
s.tc.UpdateLeaderCount(3, 15)
// Cannot move leader out of store4, move a leader into store1.
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 3, 1)
// Stores: 1 2 3 4
// Leaders: 1 2 15 16
// Region1: - F L F
// Region2: L F F -
s.tc.AddLeaderStore(2, 2)
s.tc.AddLeaderRegion(1, 3, 2, 4)
s.tc.AddLeaderRegion(2, 1, 2, 3)
// No leader in store16, no follower in store1. Now source and target are store3 and store2.
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 3, 2)
// Stores: 1 2 3 4
// Leaders: 9 10 10 11
// Region1: - F F L
// Region2: L F F -
for i := uint64(1); i <= 4; i++ {
s.tc.AddLeaderStore(i, 10)
}
s.tc.AddLeaderRegion(1, 4, 2, 3)
s.tc.AddLeaderRegion(2, 1, 2, 3)
// The cluster is balanced.
c.Assert(s.schedule(), IsNil)
c.Assert(s.schedule(), IsNil)
// store3's leader drops:
// Stores: 1 2 3 4
// Leaders: 11 13 0 16
// Region1: - F F L
// Region2: L F F -
s.tc.AddLeaderStore(1, 11)
s.tc.AddLeaderStore(2, 13)
s.tc.AddLeaderStore(3, 0)
s.tc.AddLeaderStore(4, 16)
testutil.CheckTransferLeader(c, s.schedule()[0], operator.OpKind(0), 4, 3)
}
var _ = Suite(&testBalanceLeaderRangeSchedulerSuite{})
type testBalanceLeaderRangeSchedulerSuite struct {
ctx context.Context
cancel context.CancelFunc
tc *mockcluster.Cluster
oc *schedule.OperatorController
}
func (s *testBalanceLeaderRangeSchedulerSuite) SetUpTest(c *C) {
s.ctx, s.cancel = context.WithCancel(context.Background())
opt := config.NewTestOptions()
s.tc = mockcluster.NewCluster(s.ctx, opt)
s.oc = schedule.NewOperatorController(s.ctx, nil, nil)
}
func (s *testBalanceLeaderRangeSchedulerSuite) TearDownTest(c *C) {
s.cancel()
}
func (s *testBalanceLeaderRangeSchedulerSuite) TestSingleRangeBalance(c *C) {
// Stores: 1 2 3 4
// Leaders: 10 10 10 10
// Weight: 0.5 0.9 1 2
// Region1: L F F F
for i := uint64(1); i <= 4; i++ {
s.tc.AddLeaderStore(i, 10)
}
s.tc.UpdateStoreLeaderWeight(1, 0.5)
s.tc.UpdateStoreLeaderWeight(2, 0.9)
s.tc.UpdateStoreLeaderWeight(3, 1)
s.tc.UpdateStoreLeaderWeight(4, 2)
s.tc.AddLeaderRegionWithRange(1, "a", "g", 1, 2, 3, 4)
lb, err := schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"", ""}))
c.Assert(err, IsNil)
ops := lb.Schedule(s.tc)
c.Assert(ops, NotNil)
c.Assert(ops, HasLen, 1)
c.Assert(ops[0].Counters, HasLen, 2)
c.Assert(ops[0].FinishedCounters, HasLen, 3)
lb, err = schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"h", "n"}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
lb, err = schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"b", "f"}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
lb, err = schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"", "a"}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
lb, err = schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"g", ""}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
lb, err = schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"", "f"}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
lb, err = schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"b", ""}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
}
func (s *testBalanceLeaderRangeSchedulerSuite) TestMultiRangeBalance(c *C) {
// Stores: 1 2 3 4
// Leaders: 10 10 10 10
// Weight: 0.5 0.9 1 2
// Region1: L F F F
for i := uint64(1); i <= 4; i++ {
s.tc.AddLeaderStore(i, 10)
}
s.tc.UpdateStoreLeaderWeight(1, 0.5)
s.tc.UpdateStoreLeaderWeight(2, 0.9)
s.tc.UpdateStoreLeaderWeight(3, 1)
s.tc.UpdateStoreLeaderWeight(4, 2)
s.tc.AddLeaderRegionWithRange(1, "a", "g", 1, 2, 3, 4)
lb, err := schedule.CreateScheduler(BalanceLeaderType, s.oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceLeaderType, []string{"", "g", "o", "t"}))
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc)[0].RegionID(), Equals, uint64(1))
s.tc.RemoveRegion(s.tc.GetRegion(1))
s.tc.AddLeaderRegionWithRange(2, "p", "r", 1, 2, 3, 4)
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc)[0].RegionID(), Equals, uint64(2))
s.tc.RemoveRegion(s.tc.GetRegion(2))
s.tc.AddLeaderRegionWithRange(3, "u", "w", 1, 2, 3, 4)
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
s.tc.RemoveRegion(s.tc.GetRegion(3))
s.tc.AddLeaderRegionWithRange(4, "", "", 1, 2, 3, 4)
c.Assert(err, IsNil)
c.Assert(lb.Schedule(s.tc), IsNil)
}
var _ = Suite(&testBalanceRegionSchedulerSuite{})
type testBalanceRegionSchedulerSuite struct {
ctx context.Context
cancel context.CancelFunc
}
func (s *testBalanceRegionSchedulerSuite) SetUpSuite(c *C) {
s.ctx, s.cancel = context.WithCancel(context.Background())
}
func (s *testBalanceRegionSchedulerSuite) TearDownSuite(c *C) {
s.cancel()
}
func (s *testBalanceRegionSchedulerSuite) TestBalance(c *C) {
opt := config.NewTestOptions()
// TODO: enable placementrules
opt.SetPlacementRuleEnabled(false)
tc := mockcluster.NewCluster(s.ctx, opt)
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
opt.SetMaxReplicas(1)
// Add stores 1,2,3,4.
tc.AddRegionStore(1, 6)
tc.AddRegionStore(2, 8)
tc.AddRegionStore(3, 8)
tc.AddRegionStore(4, 16)
// Add region 1 with leader in store 4.
tc.AddLeaderRegion(1, 4)
testutil.CheckTransferPeerWithLeaderTransfer(c, sb.Schedule(tc)[0], operator.OpKind(0), 4, 1)
// Test stateFilter.
tc.SetStoreOffline(1)
tc.UpdateRegionCount(2, 6)
// When store 1 is offline, it will be filtered,
// store 2 becomes the store with least regions.
testutil.CheckTransferPeerWithLeaderTransfer(c, sb.Schedule(tc)[0], operator.OpKind(0), 4, 2)
opt.SetMaxReplicas(3)
c.Assert(sb.Schedule(tc), IsNil)
opt.SetMaxReplicas(1)
c.Assert(sb.Schedule(tc), NotNil)
}
func (s *testBalanceRegionSchedulerSuite) TestReplicas3(c *C) {
opt := config.NewTestOptions()
// TODO: enable placementrules
opt.SetPlacementRuleEnabled(false)
tc := mockcluster.NewCluster(s.ctx, opt)
tc.SetMaxReplicas(3)
tc.SetLocationLabels([]string{"zone", "rack", "host"})
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
s.checkReplica3(c, tc, sb)
tc.SetEnablePlacementRules(true)
s.checkReplica3(c, tc, sb)
}
func (s *testBalanceRegionSchedulerSuite) checkReplica3(c *C, tc *mockcluster.Cluster, sb schedule.Scheduler) {
// Store 1 has the largest region score, so the balance scheduler tries to replace peer in store 1.
tc.AddLabelsStore(1, 16, map[string]string{"zone": "z1", "rack": "r1", "host": "h1"})
tc.AddLabelsStore(2, 15, map[string]string{"zone": "z1", "rack": "r2", "host": "h1"})
tc.AddLabelsStore(3, 14, map[string]string{"zone": "z1", "rack": "r2", "host": "h2"})
tc.AddLeaderRegion(1, 1, 2, 3)
// This schedule try to replace peer in store 1, but we have no other stores.
c.Assert(sb.Schedule(tc), IsNil)
// Store 4 has smaller region score than store 2.
tc.AddLabelsStore(4, 2, map[string]string{"zone": "z1", "rack": "r2", "host": "h1"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 2, 4)
// Store 5 has smaller region score than store 1.
tc.AddLabelsStore(5, 2, map[string]string{"zone": "z1", "rack": "r1", "host": "h1"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 5)
// Store 6 has smaller region score than store 5.
tc.AddLabelsStore(6, 1, map[string]string{"zone": "z1", "rack": "r1", "host": "h1"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 6)
// Store 7 has smaller region score with store 6.
tc.AddLabelsStore(7, 0, map[string]string{"zone": "z1", "rack": "r1", "host": "h2"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 7)
// If store 7 is not available, will choose store 6.
tc.SetStoreDown(7)
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 6)
// Store 8 has smaller region score than store 7, but the distinct score decrease.
tc.AddLabelsStore(8, 1, map[string]string{"zone": "z1", "rack": "r2", "host": "h3"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 6)
// Take down 4,5,6,7
tc.SetStoreDown(4)
tc.SetStoreDown(5)
tc.SetStoreDown(6)
tc.SetStoreDown(7)
tc.SetStoreDown(8)
// Store 9 has different zone with other stores but larger region score than store 1.
tc.AddLabelsStore(9, 20, map[string]string{"zone": "z2", "rack": "r1", "host": "h1"})
c.Assert(sb.Schedule(tc), IsNil)
}
func (s *testBalanceRegionSchedulerSuite) TestReplicas5(c *C) {
opt := config.NewTestOptions()
// TODO: enable placementrules
opt.SetPlacementRuleEnabled(false)
tc := mockcluster.NewCluster(s.ctx, opt)
tc.SetMaxReplicas(5)
tc.SetLocationLabels([]string{"zone", "rack", "host"})
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
s.checkReplica5(c, tc, sb)
tc.SetEnablePlacementRules(true)
s.checkReplica5(c, tc, sb)
}
func (s *testBalanceRegionSchedulerSuite) checkReplica5(c *C, tc *mockcluster.Cluster, sb schedule.Scheduler) {
tc.AddLabelsStore(1, 4, map[string]string{"zone": "z1", "rack": "r1", "host": "h1"})
tc.AddLabelsStore(2, 5, map[string]string{"zone": "z2", "rack": "r1", "host": "h1"})
tc.AddLabelsStore(3, 6, map[string]string{"zone": "z3", "rack": "r1", "host": "h1"})
tc.AddLabelsStore(4, 7, map[string]string{"zone": "z4", "rack": "r1", "host": "h1"})
tc.AddLabelsStore(5, 28, map[string]string{"zone": "z5", "rack": "r1", "host": "h1"})
tc.AddLeaderRegion(1, 1, 2, 3, 4, 5)
// Store 6 has smaller region score.
tc.AddLabelsStore(6, 1, map[string]string{"zone": "z5", "rack": "r2", "host": "h1"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 5, 6)
// Store 7 has larger region score and same distinct score with store 6.
tc.AddLabelsStore(7, 5, map[string]string{"zone": "z6", "rack": "r1", "host": "h1"})
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 5, 6)
// Store 1 has smaller region score and higher distinct score.
tc.AddLeaderRegion(1, 2, 3, 4, 5, 6)
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 5, 1)
// Store 6 has smaller region score and higher distinct score.
tc.AddLabelsStore(11, 29, map[string]string{"zone": "z1", "rack": "r2", "host": "h1"})
tc.AddLabelsStore(12, 8, map[string]string{"zone": "z2", "rack": "r2", "host": "h1"})
tc.AddLabelsStore(13, 7, map[string]string{"zone": "z3", "rack": "r2", "host": "h1"})
tc.AddLeaderRegion(1, 2, 3, 11, 12, 13)
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 11, 6)
}
// TestBalance2 for corner case 1:
// 11 regions distributed across 5 stores.
//| region_id | leader_store | follower_store | follower_store |
//|-----------|--------------|----------------|----------------|
//| 1 | 1 | 2 | 3 |
//| 2 | 1 | 2 | 3 |
//| 3 | 1 | 2 | 3 |
//| 4 | 1 | 2 | 3 |
//| 5 | 1 | 2 | 3 |
//| 6 | 1 | 2 | 3 |
//| 7 | 1 | 2 | 4 |
//| 8 | 1 | 2 | 4 |
//| 9 | 1 | 2 | 4 |
//| 10 | 1 | 4 | 5 |
//| 11 | 1 | 4 | 5 |
// and the space of last store 5 if very small, about 5 * regionSize
// the source region is more likely distributed in store[1, 2, 3].
func (s *testBalanceRegionSchedulerSuite) TestBalance1(c *C) {
opt := config.NewTestOptions()
opt.SetPlacementRuleEnabled(false)
tc := mockcluster.NewCluster(s.ctx, opt)
tc.DisableFeature(versioninfo.JointConsensus)
tc.SetTolerantSizeRatio(1)
tc.SetRegionScheduleLimit(1)
tc.SetRegionScoreFormulaVersion("v1")
oc := schedule.NewOperatorController(s.ctx, nil, nil)
source := core.NewRegionInfo(
&metapb.Region{
Id: 1,
StartKey: []byte(""),
EndKey: []byte("a"),
Peers: []*metapb.Peer{
{Id: 101, StoreId: 1},
{Id: 102, StoreId: 2},
},
},
&metapb.Peer{Id: 101, StoreId: 1},
core.SetApproximateSize(1),
core.SetApproximateKeys(1),
)
target := core.NewRegionInfo(
&metapb.Region{
Id: 2,
StartKey: []byte("a"),
EndKey: []byte("t"),
Peers: []*metapb.Peer{
{Id: 103, StoreId: 1},
{Id: 104, StoreId: 4},
{Id: 105, StoreId: 3},
},
},
&metapb.Peer{Id: 104, StoreId: 4},
core.SetApproximateSize(200),
core.SetApproximateKeys(200),
)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
tc.AddRegionStore(1, 11)
tc.AddRegionStore(2, 9)
tc.AddRegionStore(3, 6)
tc.AddRegionStore(4, 5)
tc.AddRegionStore(5, 2)
tc.AddLeaderRegion(1, 1, 2, 3)
tc.AddLeaderRegion(2, 1, 2, 3)
// add two merge operator to let the count of opRegion to 2.
ops, err := operator.CreateMergeRegionOperator("merge-region", tc, source, target, operator.OpMerge)
c.Assert(err, IsNil)
oc.SetOperator(ops[0])
oc.SetOperator(ops[1])
c.Assert(sb.IsScheduleAllowed(tc), IsTrue)
c.Assert(sb.Schedule(tc)[0], NotNil)
// if the space of store 5 is normal, we can balance region to store 5
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 5)
// the used size of store 5 reach (highSpace, lowSpace)
origin := tc.GetStore(5)
stats := origin.GetStoreStats()
stats.Capacity = 50
stats.Available = 20
stats.UsedSize = 28
store5 := origin.Clone(core.SetStoreStats(stats))
tc.PutStore(store5)
// remove op influence
oc.RemoveOperator(ops[1])
oc.RemoveOperator(ops[0])
// the scheduler first picks store 1 as source store,
// and store 5 as target store, but cannot pass `shouldBalance`.
// Then it will try store 4.
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 4)
}
func (s *testBalanceRegionSchedulerSuite) TestStoreWeight(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
// TODO: enable placementrules
tc.SetPlacementRuleEnabled(false)
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
opt.SetMaxReplicas(1)
tc.AddRegionStore(1, 10)
tc.AddRegionStore(2, 10)
tc.AddRegionStore(3, 10)
tc.AddRegionStore(4, 10)
tc.UpdateStoreRegionWeight(1, 0.5)
tc.UpdateStoreRegionWeight(2, 0.9)
tc.UpdateStoreRegionWeight(3, 1.0)
tc.UpdateStoreRegionWeight(4, 2.0)
tc.AddLeaderRegion(1, 1)
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 4)
tc.UpdateRegionCount(4, 30)
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 3)
}
func (s *testBalanceRegionSchedulerSuite) TestReplacePendingRegion(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
tc.SetMaxReplicas(3)
tc.SetLocationLabels([]string{"zone", "rack", "host"})
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
s.checkReplacePendingRegion(c, tc, sb)
tc.SetEnablePlacementRules(true)
s.checkReplacePendingRegion(c, tc, sb)
}
func (s *testBalanceRegionSchedulerSuite) TestOpInfluence(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
// TODO: enable placementrules
tc.SetEnablePlacementRules(false)
tc.DisableFeature(versioninfo.JointConsensus)
stream := hbstream.NewTestHeartbeatStreams(s.ctx, tc.ID, tc, false /* no need to run */)
oc := schedule.NewOperatorController(s.ctx, tc, stream)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
opt.SetMaxReplicas(1)
// Add stores 1,2,3,4.
tc.AddRegionStoreWithLeader(1, 2)
tc.AddRegionStoreWithLeader(2, 8)
tc.AddRegionStoreWithLeader(3, 8)
tc.AddRegionStoreWithLeader(4, 16, 8)
// add 8 leader regions to store 4 and move them to store 3
// ensure store score without operator influence : store 4 > store 3
// and store score with operator influence : store 3 > store 4
for i := 1; i <= 8; i++ {
id, _ := tc.Alloc()
origin := tc.AddLeaderRegion(id, 4)
newPeer := &metapb.Peer{StoreId: 3, Role: metapb.PeerRole_Voter}
op, _ := operator.CreateMovePeerOperator("balance-region", tc, origin, operator.OpKind(0), 4, newPeer)
c.Assert(op, NotNil)
oc.AddOperator(op)
}
testutil.CheckTransferPeerWithLeaderTransfer(c, sb.Schedule(tc)[0], operator.OpKind(0), 3, 1)
}
func (s *testBalanceRegionSchedulerSuite) checkReplacePendingRegion(c *C, tc *mockcluster.Cluster, sb schedule.Scheduler) {
// Store 1 has the largest region score, so the balance scheduler try to replace peer in store 1.
tc.AddLabelsStore(1, 16, map[string]string{"zone": "z1", "rack": "r1", "host": "h1"})
tc.AddLabelsStore(2, 7, map[string]string{"zone": "z1", "rack": "r2", "host": "h1"})
tc.AddLabelsStore(3, 15, map[string]string{"zone": "z1", "rack": "r2", "host": "h2"})
// Store 4 has smaller region score than store 1 and more better place than store 2.
tc.AddLabelsStore(4, 10, map[string]string{"zone": "z1", "rack": "r1", "host": "h1"})
// set pending peer
tc.AddLeaderRegion(1, 1, 2, 3)
tc.AddLeaderRegion(2, 1, 2, 3)
tc.AddLeaderRegion(3, 2, 1, 3)
region := tc.GetRegion(3)
region = region.Clone(core.WithPendingPeers([]*metapb.Peer{region.GetStorePeer(1)}))
tc.PutRegion(region)
c.Assert(sb.Schedule(tc)[0].RegionID(), Equals, uint64(3))
testutil.CheckTransferPeer(c, sb.Schedule(tc)[0], operator.OpKind(0), 1, 4)
}
func (s *testBalanceRegionSchedulerSuite) TestShouldNotBalance(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
region := tc.MockRegionInfo(1, 0, []uint64{2, 3, 4}, nil, nil)
tc.PutRegion(region)
operators := sb.Schedule(tc)
if operators != nil {
c.Assert(len(operators), Equals, 0)
} else {
c.Assert(operators, IsNil)
}
}
func (s *testBalanceRegionSchedulerSuite) TestEmptyRegion(c *C) {
opt := config.NewTestOptions()
tc := mockcluster.NewCluster(s.ctx, opt)
tc.DisableFeature(versioninfo.JointConsensus)
oc := schedule.NewOperatorController(s.ctx, nil, nil)
sb, err := schedule.CreateScheduler(BalanceRegionType, oc, core.NewStorage(kv.NewMemoryKV()), schedule.ConfigSliceDecoder(BalanceRegionType, []string{"", ""}))
c.Assert(err, IsNil)
tc.AddRegionStore(1, 10)
tc.AddRegionStore(2, 9)
tc.AddRegionStore(3, 10)
tc.AddRegionStore(4, 10)
region := core.NewRegionInfo(
&metapb.Region{
Id: 5,
StartKey: []byte("a"),
EndKey: []byte("b"),
Peers: []*metapb.Peer{
{Id: 6, StoreId: 1},
{Id: 7, StoreId: 3},
{Id: 8, StoreId: 4},
},
},
&metapb.Peer{Id: 7, StoreId: 3},
core.SetApproximateSize(1),
core.SetApproximateKeys(1),
)
tc.PutRegion(region)
operators := sb.Schedule(tc)
c.Assert(operators, NotNil)