Refactor master

Signed-off-by: Nzhenshan.cao <zhenshan.cao@zilliz.com>

internal/master/id/id.go

-
 package id
 
 import (
 	"github.com/zilliztech/milvus-distributed/internal/kv"
 	"github.com/zilliztech/milvus-distributed/internal/master/tso"
+	"github.com/zilliztech/milvus-distributed/internal/util/tsoutil"
 	"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
 )
 
-
 type UniqueID = typeutil.UniqueID
 
 // GlobalTSOAllocator is the global single point TSO allocator.
@@ -17,13 +16,18 @@ type GlobalIdAllocator struct {
 
 var allocator *GlobalIdAllocator
 
-func InitGlobalIdAllocator(key string, base kv.KVBase){
+func Init() {
+	InitGlobalIdAllocator("idTimestamp", tsoutil.NewTSOKVBase("gid"))
+}
+
+func InitGlobalIdAllocator(key string, base kv.KVBase) {
 	allocator = NewGlobalIdAllocator(key, base)
+	allocator.Initialize()
 }
 
-func NewGlobalIdAllocator(key string, base kv.KVBase) * GlobalIdAllocator{
+func NewGlobalIdAllocator(key string, base kv.KVBase) *GlobalIdAllocator {
 	return &GlobalIdAllocator{
-		allocator: tso.NewGlobalTSOAllocator( key, base),
+		allocator: tso.NewGlobalTSOAllocator(key, base),
 	}
 }
 

internal/master/id/id_test.go

 package id
 
 import (
-	"github.com/stretchr/testify/assert"
-	"github.com/zilliztech/milvus-distributed/internal/kv/mockkv"
 	"os"
-
 	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zilliztech/milvus-distributed/internal/conf"
+	"github.com/zilliztech/milvus-distributed/internal/util/tsoutil"
 )
 
 var GIdAllocator *GlobalIdAllocator
 
 func TestMain(m *testing.M) {
-	GIdAllocator = NewGlobalIdAllocator("idTimestamp", mockkv.NewEtcdKV())
+	conf.LoadConfig("config.yaml")
+	GIdAllocator = NewGlobalIdAllocator("idTimestamp", tsoutil.NewTSOKVBase("gid"))
 	exitCode := m.Run()
 	os.Exit(exitCode)
 }
@@ -30,8 +32,8 @@ func TestGlobalIdAllocator_AllocOne(t *testing.T) {
 }
 
 func TestGlobalIdAllocator_Alloc(t *testing.T) {
-	count := uint32(2<<10)
+	count := uint32(2 << 10)
 	idStart, idEnd, err := GIdAllocator.Alloc(count)
 	assert.Nil(t, err)
-	assert.Equal(t, count, uint32(idEnd - idStart))
+	assert.Equal(t, count, uint32(idEnd-idStart))
 }

internal/master/master.go

@@ -6,15 +6,16 @@ import (
 	"log"
 	"math/rand"
 	"net"
-	"path"
 	"strconv"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/zilliztech/milvus-distributed/internal/master/id"
+	"github.com/zilliztech/milvus-distributed/internal/master/tso"
+
 	"github.com/apache/pulsar-client-go/pulsar"
 	"github.com/golang/protobuf/proto"
-	"github.com/zilliztech/milvus-distributed/internal/master/id"
 	"github.com/zilliztech/milvus-distributed/internal/conf"
 	"github.com/zilliztech/milvus-distributed/internal/kv"
 	"github.com/zilliztech/milvus-distributed/internal/master/controller"
@@ -23,7 +24,6 @@ import (
 	"github.com/zilliztech/milvus-distributed/internal/proto/masterpb"
 	"google.golang.org/grpc"
 
-	"github.com/zilliztech/milvus-distributed/internal/master/tso"
 	"go.etcd.io/etcd/clientv3"
 )
 
@@ -57,17 +57,6 @@ type Master struct {
 	closeCallbacks []func()
 }
 
-func newTSOKVBase(subPath string) * kv.EtcdKV{
-	etcdAddr := conf.Config.Etcd.Address
-	etcdAddr += ":"
-	etcdAddr += strconv.FormatInt(int64(conf.Config.Etcd.Port), 10)
-	client, _ := clientv3.New(clientv3.Config{
-		Endpoints:   []string{etcdAddr},
-		DialTimeout: 5 * time.Second,
-	})
-	return kv.NewEtcdKV(client, path.Join(conf.Config.Etcd.Rootpath, subPath))
-}
-
 func newKVBase() *kv.EtcdKV {
 	etcdAddr := conf.Config.Etcd.Address
 	etcdAddr += ":"
@@ -80,11 +69,15 @@ func newKVBase() *kv.EtcdKV {
 	return kvBase
 }
 
+func Init() {
+	rand.Seed(time.Now().UnixNano())
+	id.Init()
+	tso.Init()
+}
+
 // CreateServer creates the UNINITIALIZED pd server with given configuration.
 func CreateServer(ctx context.Context) (*Master, error) {
-	rand.Seed(time.Now().UnixNano())
-	id.InitGlobalIdAllocator("idTimestamp", newTSOKVBase("gid"))
-	tso.InitGlobalTsoAllocator("timestamp", newTSOKVBase("tso"))
+	Init()
 	m := &Master{
 		ctx:            ctx,
 		startTimestamp: time.Now().Unix(),
@@ -179,7 +172,7 @@ func (s *Master) startServerLoop(ctx context.Context) {
 }
 
 func (s *Master) stopServerLoop() {
-	if s.grpcServer != nil{
+	if s.grpcServer != nil {
 		s.grpcServer.GracefulStop()
 	}
 	s.serverLoopCancel()

internal/master/tso/global_allocator.go

@@ -38,10 +38,14 @@ type GlobalTSOAllocator struct {
 
 var allocator *GlobalTSOAllocator
 
-func InitGlobalTsoAllocator(key string, base kv.KVBase){
-	allocator = NewGlobalTSOAllocator(key, base)
+func Init() {
+	InitGlobalTsoAllocator("timestamp", tsoutil.NewTSOKVBase("tso"))
 }
 
+func InitGlobalTsoAllocator(key string, base kv.KVBase) {
+	allocator = NewGlobalTSOAllocator(key, base)
+	allocator.Initialize()
+}
 
 // NewGlobalTSOAllocator creates a new global TSO allocator.
 func NewGlobalTSOAllocator(key string, kvBase kv.KVBase) *GlobalTSOAllocator {
@@ -59,7 +63,7 @@ func NewGlobalTSOAllocator(key string, kvBase kv.KVBase) *GlobalTSOAllocator {
 
 // Initialize will initialize the created global TSO allocator.
 func (gta *GlobalTSOAllocator) Initialize() error {
-	return gta.tso.SyncTimestamp()
+	return gta.tso.InitTimestamp()
 }
 
 // UpdateTSO is used to update the TSO in memory and the time window in etcd.
@@ -104,7 +108,7 @@ func (gta *GlobalTSOAllocator) GenerateTSO(count uint32) (uint64, error) {
 	return 0, errors.New("can not get timestamp")
 }
 
-func (gta *GlobalTSOAllocator) Alloc(count uint32)(typeutil.Timestamp, error) {
+func (gta *GlobalTSOAllocator) Alloc(count uint32) (typeutil.Timestamp, error) {
 	//return gta.tso.SyncTimestamp()
 	start, err := gta.GenerateTSO(count)
 	if err != nil {
@@ -117,21 +121,20 @@ func (gta *GlobalTSOAllocator) Alloc(count uint32)(typeutil.Timestamp, error) {
 	return start, err
 }
 
-func (gta *GlobalTSOAllocator) AllocOne()(typeutil.Timestamp, error) {
+func (gta *GlobalTSOAllocator) AllocOne() (typeutil.Timestamp, error) {
 	return gta.GenerateTSO(1)
 }
 
-
 // Reset is used to reset the TSO allocator.
 func (gta *GlobalTSOAllocator) Reset() {
 	gta.tso.ResetTimestamp()
 }
 
-func AllocOne()(typeutil.Timestamp, error) {
+func AllocOne() (typeutil.Timestamp, error) {
 	return allocator.AllocOne()
 }
 
 // Reset is used to reset the TSO allocator.
-func Alloc(count uint32)(typeutil.Timestamp, error) {
+func Alloc(count uint32) (typeutil.Timestamp, error) {
 	return allocator.Alloc(count)
 }

internal/master/tso/global_allocator_test.go

 package tso
 
 import (
-	"github.com/stretchr/testify/assert"
-	"github.com/zilliztech/milvus-distributed/internal/kv/mockkv"
-	"github.com/zilliztech/milvus-distributed/internal/util/tsoutil"
 	"os"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/zilliztech/milvus-distributed/internal/conf"
+	"github.com/zilliztech/milvus-distributed/internal/util/tsoutil"
 )
 
 var GTsoAllocator Allocator
 
 func TestMain(m *testing.M) {
-	GTsoAllocator = NewGlobalTSOAllocator("timestamp", mockkv.NewEtcdKV())
+	conf.LoadConfig("config.yaml")
+	GTsoAllocator = NewGlobalTSOAllocator("timestamp", tsoutil.NewTSOKVBase("tso"))
+
 	exitCode := m.Run()
 	os.Exit(exitCode)
 }
@@ -28,7 +31,7 @@ func TestGlobalTSOAllocator_GenerateTSO(t *testing.T) {
 	startTs, err := GTsoAllocator.GenerateTSO(perCount)
 	assert.Nil(t, err)
 	lastPhysical, lastLogical := tsoutil.ParseTS(startTs)
-	for i:=0;i < count; i++{
+	for i := 0; i < count; i++ {
 		ts, _ := GTsoAllocator.GenerateTSO(perCount)
 		physical, logical := tsoutil.ParseTS(ts)
 		if lastPhysical == physical {
@@ -41,7 +44,7 @@ func TestGlobalTSOAllocator_GenerateTSO(t *testing.T) {
 
 func TestGlobalTSOAllocator_SetTSO(t *testing.T) {
 	curTime := time.Now()
-	nextTime := curTime.Add(2 * time.Second )
+	nextTime := curTime.Add(2 * time.Second)
 	physical := nextTime.UnixNano() / int64(time.Millisecond)
 	logical := int64(0)
 	err := GTsoAllocator.SetTSO(tsoutil.ComposeTS(physical, logical))

internal/master/tso/tso.go

@@ -83,28 +83,27 @@ func (t *timestampOracle) saveTimestamp(ts time.Time) error {
 	return nil
 }
 
-// SyncTimestamp is used to synchronize the timestamp.
-func (t *timestampOracle) SyncTimestamp() error {
+func (t *timestampOracle) InitTimestamp() error {
 
-	last, err := t.loadTimestamp()
-	if err != nil {
-		return err
-	}
+	//last, err := t.loadTimestamp()
+	//if err != nil {
+	//	return err
+	//}
 
 	next := time.Now()
 
 	// If the current system time minus the saved etcd timestamp is less than `updateTimestampGuard`,
 	// the timestamp allocation will start from the saved etcd timestamp temporarily.
-	if typeutil.SubTimeByWallClock(next, last) < updateTimestampGuard {
-		next = last.Add(updateTimestampGuard)
-	}
+	//if typeutil.SubTimeByWallClock(next, last) < updateTimestampGuard {
+	//	next = last.Add(updateTimestampGuard)
+	//}
 
 	save := next.Add(t.saveInterval)
-	if err = t.saveTimestamp(save); err != nil {
+	if err := t.saveTimestamp(save); err != nil {
 		return err
 	}
 
-	log.Print("sync and save timestamp", zap.Time("last", last), zap.Time("save", save), zap.Time("next", next))
+	//log.Print("sync and save timestamp", zap.Time("last", last), zap.Time("save", save), zap.Time("next", next))
 
 	current := &atomicObject{
 		physical: next,
@@ -156,7 +155,7 @@ func (t *timestampOracle) UpdateTimestamp() error {
 	now := time.Now()
 
 	jetLag := typeutil.SubTimeByWallClock(now, prev.physical)
-	if jetLag > 3 * UpdateTimestampStep {
+	if jetLag > 3*UpdateTimestampStep {
 		log.Print("clock offset", zap.Duration("jet-lag", jetLag), zap.Time("prev-physical", prev.physical), zap.Time("now", now))
 	}
 
@@ -197,7 +196,7 @@ func (t *timestampOracle) UpdateTimestamp() error {
 // ResetTimestamp is used to reset the timestamp.
 func (t *timestampOracle) ResetTimestamp() {
 	zero := &atomicObject{
-		physical: typeutil.ZeroTime,
+		physical: time.Now(),
 	}
 	atomic.StorePointer(&t.TSO, unsafe.Pointer(zero))
 }

internal/proxy/grpc_service.go

@@ -35,9 +35,7 @@ func (p *Proxy) Insert(ctx context.Context, in *servicepb.RowBatch) (*servicepb.
 
 	defer it.cancel()
 
-	var t task = it
-	p.taskSch.DmQueue.Enqueue(&t)
-	for {
+	p.taskSch.DmQueue.Enqueue(it)
 	select {
 	case <-ctx.Done():
 		log.Print("insert timeout!")
@@ -50,7 +48,6 @@ func (p *Proxy) Insert(ctx context.Context, in *servicepb.RowBatch) (*servicepb.
 	case result := <-it.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) CreateCollection(ctx context.Context, req *schemapb.CollectionSchema) (*commonpb.Status, error) {
@@ -69,9 +66,7 @@ func (p *Proxy) CreateCollection(ctx context.Context, req *schemapb.CollectionSc
 	cct.ctx, cct.cancel = context.WithCancel(ctx)
 	defer cct.cancel()
 
-	var t task = cct
-	p.taskSch.DdQueue.Enqueue(&t)
-	for {
+	p.taskSch.DdQueue.Enqueue(cct)
 	select {
 	case <-ctx.Done():
 		log.Print("create collection timeout!")
@@ -82,7 +77,6 @@ func (p *Proxy) CreateCollection(ctx context.Context, req *schemapb.CollectionSc
 	case result := <-cct.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) Search(ctx context.Context, req *servicepb.Query) (*servicepb.QueryResult, error) {
@@ -102,9 +96,7 @@ func (p *Proxy) Search(ctx context.Context, req *servicepb.Query) (*servicepb.Qu
 	qt.SearchRequest.Query.Value = queryBytes
 	defer qt.cancel()
 
-	var t task = qt
-	p.taskSch.DqQueue.Enqueue(&t)
-	for {
+	p.taskSch.DqQueue.Enqueue(qt)
 	select {
 	case <-ctx.Done():
 		log.Print("query timeout!")
@@ -117,7 +109,6 @@ func (p *Proxy) Search(ctx context.Context, req *servicepb.Query) (*servicepb.Qu
 	case result := <-qt.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) DropCollection(ctx context.Context, req *servicepb.CollectionName) (*commonpb.Status, error) {
@@ -134,9 +125,7 @@ func (p *Proxy) DropCollection(ctx context.Context, req *servicepb.CollectionNam
 	dct.ctx, dct.cancel = context.WithCancel(ctx)
 	defer dct.cancel()
 
-	var t task = dct
-	p.taskSch.DdQueue.Enqueue(&t)
-	for {
+	p.taskSch.DdQueue.Enqueue(dct)
 	select {
 	case <-ctx.Done():
 		log.Print("create collection timeout!")
@@ -147,7 +136,6 @@ func (p *Proxy) DropCollection(ctx context.Context, req *servicepb.CollectionNam
 	case result := <-dct.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) HasCollection(ctx context.Context, req *servicepb.CollectionName) (*servicepb.BoolResponse, error) {
@@ -164,9 +152,7 @@ func (p *Proxy) HasCollection(ctx context.Context, req *servicepb.CollectionName
 	hct.ctx, hct.cancel = context.WithCancel(ctx)
 	defer hct.cancel()
 
-	var t task = hct
-	p.taskSch.DqQueue.Enqueue(&t)
-	for {
+	p.taskSch.DqQueue.Enqueue(hct)
 	select {
 	case <-ctx.Done():
 		log.Print("has collection timeout!")
@@ -180,7 +166,6 @@ func (p *Proxy) HasCollection(ctx context.Context, req *servicepb.CollectionName
 	case result := <-hct.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) DescribeCollection(ctx context.Context, req *servicepb.CollectionName) (*servicepb.CollectionDescription, error) {
@@ -197,9 +182,7 @@ func (p *Proxy) DescribeCollection(ctx context.Context, req *servicepb.Collectio
 	dct.ctx, dct.cancel = context.WithCancel(ctx)
 	defer dct.cancel()
 
-	var t task = dct
-	p.taskSch.DqQueue.Enqueue(&t)
-	for {
+	p.taskSch.DqQueue.Enqueue(dct)
 	select {
 	case <-ctx.Done():
 		log.Print("has collection timeout!")
@@ -212,7 +195,6 @@ func (p *Proxy) DescribeCollection(ctx context.Context, req *servicepb.Collectio
 	case result := <-dct.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) ShowCollections(ctx context.Context, req *commonpb.Empty) (*servicepb.StringListResponse, error) {
@@ -228,9 +210,7 @@ func (p *Proxy) ShowCollections(ctx context.Context, req *commonpb.Empty) (*serv
 	sct.ctx, sct.cancel = context.WithCancel(ctx)
 	defer sct.cancel()
 
-	var t task = sct
-	p.taskSch.DqQueue.Enqueue(&t)
-	for {
+	p.taskSch.DqQueue.Enqueue(sct)
 	select {
 	case <-ctx.Done():
 		log.Print("show collections timeout!")
@@ -243,7 +223,6 @@ func (p *Proxy) ShowCollections(ctx context.Context, req *commonpb.Empty) (*serv
 	case result := <-sct.resultChan:
 		return result, nil
 	}
-	}
 }
 
 func (p *Proxy) CreatePartition(ctx context.Context, in *servicepb.PartitionName) (*commonpb.Status, error) {

internal/proxy/proxy.go

@@ -2,6 +2,7 @@ package proxy
 
 import (
 	"context"
+	"google.golang.org/grpc"
 	"log"
 	"math/rand"
 	"net"
@@ -14,7 +15,6 @@ import (
 	"github.com/zilliztech/milvus-distributed/internal/proto/masterpb"
 	"github.com/zilliztech/milvus-distributed/internal/proto/servicepb"
 	"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
-	"google.golang.org/grpc"
 )
 
 type UniqueID = typeutil.UniqueID
@@ -157,7 +157,7 @@ func (p *Proxy) queryResultLoop() {
 		if len(queryResultBuf[reqId]) == 4 {
 			// TODO: use the number of query node instead
 			t := p.taskSch.getTaskByReqId(reqId)
-			qt := (*t).(*QueryTask)
+			qt := t.(*QueryTask)
 			qt.resultBuf <- queryResultBuf[reqId]
 			delete(queryResultBuf, reqId)
 		}

internal/proxy/task_scheduler.go

@@ -11,7 +11,7 @@ import (
 
 type BaseTaskQueue struct {
 	unissuedTasks *list.List
-	activeTasks   map[Timestamp]*task
+	activeTasks   map[Timestamp]task
 	utLock        sync.Mutex
 	atLock        sync.Mutex
 }
@@ -24,23 +24,23 @@ func (queue *BaseTaskQueue) Empty() bool {
 	return queue.unissuedTasks.Len() <= 0 && len(queue.activeTasks) <= 0
 }
 
-func (queue *BaseTaskQueue) AddUnissuedTask(t *task) {
+func (queue *BaseTaskQueue) AddUnissuedTask(t task) {
 	queue.utLock.Lock()
 	defer queue.utLock.Unlock()
 	queue.unissuedTasks.PushBack(t)
 }
 
-func (queue *BaseTaskQueue) FrontUnissuedTask() *task {
+func (queue *BaseTaskQueue) FrontUnissuedTask() task {
 	queue.utLock.Lock()
 	defer queue.utLock.Unlock()
 	if queue.unissuedTasks.Len() <= 0 {
 		log.Fatal("sorry, but the unissued task list is empty!")
 		return nil
 	}
-	return queue.unissuedTasks.Front().Value.(*task)
+	return queue.unissuedTasks.Front().Value.(task)
 }
 
-func (queue *BaseTaskQueue) PopUnissuedTask() *task {
+func (queue *BaseTaskQueue) PopUnissuedTask() task {
 	queue.utLock.Lock()
 	defer queue.utLock.Unlock()
 	if queue.unissuedTasks.Len() <= 0 {
@@ -48,13 +48,13 @@ func (queue *BaseTaskQueue) PopUnissuedTask() *task {
 		return nil
 	}
 	ft := queue.unissuedTasks.Front()
-	return queue.unissuedTasks.Remove(ft).(*task)
+	return queue.unissuedTasks.Remove(ft).(task)
 }
 
-func (queue *BaseTaskQueue) AddActiveTask(t *task) {
+func (queue *BaseTaskQueue) AddActiveTask(t task) {
 	queue.atLock.Lock()
 	defer queue.atLock.Lock()
-	ts := (*t).EndTs()
+	ts := t.EndTs()
 	_, ok := queue.activeTasks[ts]
 	if ok {
 		log.Fatalf("task with timestamp %v already in active task list!", ts)
@@ -62,7 +62,7 @@ func (queue *BaseTaskQueue) AddActiveTask(t *task) {
 	queue.activeTasks[ts] = t
 }
 
-func (queue *BaseTaskQueue) PopActiveTask(ts Timestamp) *task {
+func (queue *BaseTaskQueue) PopActiveTask(ts Timestamp) task {
 	queue.atLock.Lock()
 	defer queue.atLock.Lock()
 	t, ok := queue.activeTasks[ts]
@@ -74,19 +74,19 @@ func (queue *BaseTaskQueue) PopActiveTask(ts Timestamp) *task {
 	return nil
 }
 
-func (queue *BaseTaskQueue) getTaskByReqId(reqId UniqueID) *task {
+func (queue *BaseTaskQueue) getTaskByReqId(reqId UniqueID) task {
 	queue.utLock.Lock()
 	defer queue.utLock.Lock()
 	for e := queue.unissuedTasks.Front(); e != nil; e = e.Next() {
-		if (*(e.Value.(*task))).Id() == reqId {
-			return e.Value.(*task)
+		if e.Value.(task).Id() == reqId {
+			return e.Value.(task)
 		}
 	}
 
 	queue.atLock.Lock()
 	defer queue.atLock.Unlock()
 	for ats := range queue.activeTasks {
-		if (*(queue.activeTasks[ats])).Id() == reqId {
+		if queue.activeTasks[ats].Id() == reqId {
 			return queue.activeTasks[ats]
 		}
 	}
@@ -98,7 +98,7 @@ func (queue *BaseTaskQueue) TaskDoneTest(ts Timestamp) bool {
 	queue.utLock.Lock()
 	defer queue.utLock.Unlock()
 	for e := queue.unissuedTasks.Front(); e != nil; e = e.Next() {
-		if (*(e.Value.(*task))).EndTs() >= ts {
+		if e.Value.(task).EndTs() >= ts {
 			return false
 		}
 	}
@@ -114,20 +114,20 @@ func (queue *BaseTaskQueue) TaskDoneTest(ts Timestamp) bool {
 	return true
 }
 
-type ddTaskQueue struct {
+type DdTaskQueue struct {
 	BaseTaskQueue
 	lock sync.Mutex
 }
 
-type dmTaskQueue struct {
+type DmTaskQueue struct {
 	BaseTaskQueue
 }
 
-type dqTaskQueue struct {
+type DqTaskQueue struct {
 	BaseTaskQueue
 }
 
-func (queue *ddTaskQueue) Enqueue(t *task) error {
+func (queue *DdTaskQueue) Enqueue(t task) error {
 	queue.lock.Lock()
 	defer queue.lock.Unlock()
 	// TODO: set Ts, ReqId, ProxyId
@@ -135,22 +135,49 @@ func (queue *ddTaskQueue) Enqueue(t *task) error {
 	return nil
 }
 
-func (queue *dmTaskQueue) Enqueue(t *task) error {
+func (queue *DmTaskQueue) Enqueue(t task) error {
 	// TODO: set Ts, ReqId, ProxyId
 	queue.AddUnissuedTask(t)
 	return nil
 }
 
-func (queue *dqTaskQueue) Enqueue(t *task) error {
+func (queue *DqTaskQueue) Enqueue(t task) error {
 	// TODO: set Ts, ReqId, ProxyId
 	queue.AddUnissuedTask(t)
 	return nil
 }
 
+func NewDdTaskQueue() *DdTaskQueue {
+	return &DdTaskQueue{
+		BaseTaskQueue: BaseTaskQueue{
+			unissuedTasks: list.New(),
+			activeTasks:   make(map[Timestamp]task),
+		},
+	}
+}
+
+func NewDmTaskQueue() *DmTaskQueue {
+	return &DmTaskQueue{
+		BaseTaskQueue: BaseTaskQueue{
+			unissuedTasks: list.New(),
+			activeTasks:   make(map[Timestamp]task),
+		},
+	}
+}
+
+func NewDqTaskQueue() *DqTaskQueue {
+	return &DqTaskQueue{
+		BaseTaskQueue: BaseTaskQueue{
+			unissuedTasks: list.New(),
+			activeTasks:   make(map[Timestamp]task),
+		},
+	}
+}
+
 type TaskScheduler struct {
-	DdQueue *ddTaskQueue
-	DmQueue *dmTaskQueue
-	DqQueue *dqTaskQueue
+	DdQueue *DdTaskQueue
+	DmQueue *DmTaskQueue
+	DqQueue *DqTaskQueue
 
 	idAllocator  *allocator.IdAllocator
 	tsoAllocator *allocator.TimestampAllocator
@@ -165,6 +192,9 @@ func NewTaskScheduler(ctx context.Context,
 	tsoAllocator *allocator.TimestampAllocator) (*TaskScheduler, error) {
 	ctx1, cancel := context.WithCancel(ctx)
 	s := &TaskScheduler{
+		DdQueue:      NewDdTaskQueue(),
+		DmQueue:      NewDmTaskQueue(),
+		DqQueue:      NewDqTaskQueue(),
 		idAllocator:  idAllocator,
 		tsoAllocator: tsoAllocator,
 		ctx:          ctx1,
@@ -174,19 +204,19 @@ func NewTaskScheduler(ctx context.Context,
 	return s, nil
 }
 
-func (sched *TaskScheduler) scheduleDdTask() *task {
+func (sched *TaskScheduler) scheduleDdTask() task {
 	return sched.DdQueue.PopUnissuedTask()
 }
 
-func (sched *TaskScheduler) scheduleDmTask() *task {
+func (sched *TaskScheduler) scheduleDmTask() task {
 	return sched.DmQueue.PopUnissuedTask()
 }
 
-func (sched *TaskScheduler) scheduleDqTask() *task {
+func (sched *TaskScheduler) scheduleDqTask() task {
 	return sched.DqQueue.PopUnissuedTask()
 }
 
-func (sched *TaskScheduler) getTaskByReqId(reqId UniqueID) *task {
+func (sched *TaskScheduler) getTaskByReqId(reqId UniqueID) task {
 	if t := sched.DdQueue.getTaskByReqId(reqId); t != nil {
 		return t
 	}
@@ -211,22 +241,22 @@ func (sched *TaskScheduler) definitionLoop() {
 		//sched.DdQueue.atLock.Lock()
 		t := sched.scheduleDdTask()
 
-		err := (*t).PreExecute()
+		err := t.PreExecute()
 		if err != nil {
 			return
 		}
-		err = (*t).Execute()
+		err = t.Execute()
 		if err != nil {
 			log.Printf("execute definition task failed, error = %v", err)
 		}
-		(*t).Notify(err)
+		t.Notify(err)
 
 		sched.DdQueue.AddActiveTask(t)
 
-		(*t).WaitToFinish()
-		(*t).PostExecute()
+		t.WaitToFinish()
+		t.PostExecute()
 
-		sched.DdQueue.PopActiveTask((*t).EndTs())
+		sched.DdQueue.PopActiveTask(t.EndTs())
 	}
 }
 
@@ -242,27 +272,27 @@ func (sched *TaskScheduler) manipulationLoop() {
 		sched.DmQueue.atLock.Lock()
 		t := sched.scheduleDmTask()
 
-		if err := (*t).PreExecute(); err != nil {
+		if err := t.PreExecute(); err != nil {
 			return
 		}
 
 		go func() {
-			err := (*t).Execute()
+			err := t.Execute()
 			if err != nil {
 				log.Printf("execute manipulation task failed, error = %v", err)
 			}
-			(*t).Notify(err)
+			t.Notify(err)
 		}()
 
 		sched.DmQueue.AddActiveTask(t)
 		sched.DmQueue.atLock.Unlock()
 
 		go func() {
-			(*t).WaitToFinish()
-			(*t).PostExecute()
+			t.WaitToFinish()
+			t.PostExecute()
 
 			// remove from active list
-			sched.DmQueue.PopActiveTask((*t).EndTs())
+			sched.DmQueue.PopActiveTask(t.EndTs())
 		}()
 	}
 }
@@ -279,27 +309,27 @@ func (sched *TaskScheduler) queryLoop() {
 		sched.DqQueue.atLock.Lock()
 		t := sched.scheduleDqTask()
 
-		if err := (*t).PreExecute(); err != nil {
+		if err := t.PreExecute(); err != nil {
 			return
 		}
 
 		go func() {
-			err := (*t).Execute()
+			err := t.Execute()
 			if err != nil {
 				log.Printf("execute query task failed, error = %v", err)
 			}
-			(*t).Notify(err)
+			t.Notify(err)
 		}()
 
 		sched.DqQueue.AddActiveTask(t)
 		sched.DqQueue.atLock.Unlock()
 
 		go func() {
-			(*t).WaitToFinish()
-			(*t).PostExecute()
+			t.WaitToFinish()
+			t.PostExecute()
 
 			// remove from active list
-			sched.DqQueue.PopActiveTask((*t).EndTs())
+			sched.DqQueue.PopActiveTask(t.EndTs())
 		}()
 	}
 }

internal/proxy/timetick.go

@@ -51,7 +51,6 @@ func newTimeTick(ctx context.Context, tsoAllocator *allocator.TimestampAllocator
 	return t
 }
 
-
 func (tt *timeTick) tick() error {
 
 	if tt.lastTick == tt.currentTick {

internal/util/tsoutil/tso.go

 package tsoutil
 
 import (
+	"fmt"
+	"path"
+	"strconv"
 	"time"
+
+	"github.com/zilliztech/milvus-distributed/internal/conf"
+	"github.com/zilliztech/milvus-distributed/internal/kv"
+	"go.etcd.io/etcd/clientv3"
 )
 
 const (
@@ -20,3 +27,15 @@ func ParseTS(ts uint64) (time.Time, uint64) {
 	physicalTime := time.Unix(int64(physical/1000), int64(physical)%1000*time.Millisecond.Nanoseconds())
 	return physicalTime, logical
 }
+
+func NewTSOKVBase(subPath string) *kv.EtcdKV {
+	etcdAddr := conf.Config.Etcd.Address
+	etcdAddr += ":"
+	etcdAddr += strconv.FormatInt(int64(conf.Config.Etcd.Port), 10)
+	fmt.Println("etcdAddr ::: ", etcdAddr)
+	client, _ := clientv3.New(clientv3.Config{
+		Endpoints:   []string{etcdAddr},
+		DialTimeout: 5 * time.Second,
+	})
+	return kv.NewEtcdKV(client, path.Join(conf.Config.Etcd.Rootpath, subPath))
+}