milvus/internal/masterservice/master_service.go

package masterservice

import (
	"context"
	"log"
	"math/rand"
	"strconv"
	"sync"
	"sync/atomic"
	"time"

	"github.com/zilliztech/milvus-distributed/internal/errors"
	etcdkv "github.com/zilliztech/milvus-distributed/internal/kv/etcd"
	ms "github.com/zilliztech/milvus-distributed/internal/msgstream"
	"github.com/zilliztech/milvus-distributed/internal/msgstream/pulsarms"
	"github.com/zilliztech/milvus-distributed/internal/msgstream/util"
	"github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
	"github.com/zilliztech/milvus-distributed/internal/proto/datapb"
	"github.com/zilliztech/milvus-distributed/internal/proto/internalpb2"
	"github.com/zilliztech/milvus-distributed/internal/proto/masterpb"
	"github.com/zilliztech/milvus-distributed/internal/proto/milvuspb"
	"github.com/zilliztech/milvus-distributed/internal/util/tsoutil"
	"github.com/zilliztech/milvus-distributed/internal/util/typeutil"
	"go.etcd.io/etcd/clientv3"
)

//  internalpb2 -> internalpb
//  proxypb(proxy_service)
//  querypb(query_service)
//  datapb(data_service)
//  indexpb(index_service)
//  milvuspb -> milvuspb
//  masterpb2 -> masterpb (master_service)

type InitParams struct {
	ProxyTimeTickChannel string
}

type Service interface {
	Init(params *InitParams) error
	Start() error
	Stop() error
	GetComponentStates() (*internalpb2.ComponentStates, error)
	GetTimeTickChannel() (string, error)
	GetStatesChannel() (string, error)
}

type Interface interface {
	//service
	Init(params *InitParams) error
	Start() error
	Stop() error
	GetComponentStates(empty *commonpb.Empty) (*internalpb2.ComponentStates, error)

	//DDL request
	CreateCollection(in *milvuspb.CreateCollectionRequest) (*commonpb.Status, error)
	DropCollection(in *milvuspb.DropCollectionRequest) (*commonpb.Status, error)
	HasCollection(in *milvuspb.HasCollectionRequest) (*milvuspb.BoolResponse, error)
	DescribeCollection(in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error)
	ShowCollections(in *milvuspb.ShowCollectionRequest) (*milvuspb.ShowCollectionResponse, error)
	CreatePartition(in *milvuspb.CreatePartitionRequest) (*commonpb.Status, error)
	DropPartition(in *milvuspb.DropPartitionRequest) (*commonpb.Status, error)
	HasPartition(in *milvuspb.HasPartitionRequest) (*milvuspb.BoolResponse, error)
	ShowPartitions(in *milvuspb.ShowPartitionRequest) (*milvuspb.ShowPartitionResponse, error)

	//index builder service
	CreateIndex(in *milvuspb.CreateIndexRequest) (*commonpb.Status, error)
	DescribeIndex(in *milvuspb.DescribeIndexRequest) (*milvuspb.DescribeIndexResponse, error)

	//global timestamp allocator
	AllocTimestamp(in *masterpb.TsoRequest) (*masterpb.TsoResponse, error)
	AllocID(in *masterpb.IDRequest) (*masterpb.IDResponse, error)

	//TODO, master load these channel form config file ?

	//receiver time tick from proxy service, and put it into this channel
	GetTimeTickChannel(empty *commonpb.Empty) (*milvuspb.StringResponse, error)

	//receive ddl from rpc and time tick from proxy service, and put them into this channel
	GetDdChannel(empty *commonpb.Empty) (*milvuspb.StringResponse, error)

	//just define a channel, not used currently
	GetStatisticsChannel(empty *commonpb.Empty) (*milvuspb.StringResponse, error)

	//segment
	DescribeSegment(in *milvuspb.DescribeSegmentRequest) (*milvuspb.DescribeSegmentResponse, error)
	ShowSegments(in *milvuspb.ShowSegmentRequest) (*milvuspb.ShowSegmentResponse, error)

	//get system config from master, not used currently
	//GetSysConfigs(in *milvuspb.SysConfigRequest)

	//GetIndexState(ctx context.Context, request *milvuspb.IndexStateRequest) (*milvuspb.IndexStateResponse, error)
}

// ------------------ struct -----------------------

// master core
type Core struct {
	//TODO DataService Interface
	//TODO IndexService Interface
	//TODO ProxyServiceClient Interface, get proxy service time tick channel,InvalidateCollectionMetaCache

	//TODO Segment States Channel, from DataService, if create new segment, data service should put the segment id into this channel, and let the master add the segment id to the collection meta

	//TODO Segment Flush Watcher, monitor if segment has flushed into disk
	//TODO indexBuilder Sch, tell index service to build index

	MetaTable *metaTable
	//id allocator
	idAllocator *GlobalIDAllocator
	//tso allocator
	tsoAllocator *GlobalTSOAllocator

	//inner members
	ctx     context.Context
	cancel  context.CancelFunc
	etcdCli *clientv3.Client
	kvBase  *etcdkv.EtcdKV
	metaKV  *etcdkv.EtcdKV

	//setMsgStreams, receive time tick from proxy service time tick channel
	ProxyTimeTickChan chan typeutil.Timestamp

	//setMsgStreams, send time tick into dd channel and time tick channel
	SendTimeTick func(t typeutil.Timestamp) error

	//setMsgStreams, send create collection into dd channel
	DdCreateCollectionReq func(req *internalpb2.CreateCollectionRequest) error

	//setMsgStreams, send drop collection into dd channel, and notify the proxy to delete this collection
	DdDropCollectionReq func(req *internalpb2.DropCollectionRequest) error

	//setMsgStreams, send create partition into dd channel
	DdCreatePartitionReq func(req *internalpb2.CreatePartitionRequest) error

	//setMsgStreams, send drop partition into dd channel
	DdDropPartitionReq func(req *internalpb2.DropPartitionRequest) error

	//setMsgStreams segment channel, receive segment info from data service, if master create segment
	DataServiceSegmentChan chan *datapb.SegmentInfo

	//setMsgStreams ,if segment flush completed, data node would put segment id into msg stream
	DataNodeSegmentFlushCompletedChan chan typeutil.UniqueID

	//TODO,get binlog file path from data service,
	GetBinlogFilePathsFromDataServiceReq func(segID typeutil.UniqueID, fieldID typeutil.UniqueID) ([]string, error)

	//TODO, call index builder's client to build index, return build id
	BuildIndexReq func(binlog []string, typeParams []*commonpb.KeyValuePair, indexParams []*commonpb.KeyValuePair) (typeutil.UniqueID, error)

	//TODO, proxy service interface, notify proxy service to drop collection
	InvalidateCollectionMetaCache func(dbName string, collectionName string) error

	// put create index task into this chan
	indexTaskQueue chan *CreateIndexTask

	//dd request scheduler
	ddReqQueue      chan reqTask //dd request will be push into this chan
	lastDdTimeStamp typeutil.Timestamp

	//time tick loop
	lastTimeTick typeutil.Timestamp

	//states code
	stateCode atomic.Value

	//call once
	initOnce  sync.Once
	startOnce sync.Once
	isInit    atomic.Value
}

// --------------------- function --------------------------

func NewCore(c context.Context) (*Core, error) {
	ctx, cancel := context.WithCancel(c)
	rand.Seed(time.Now().UnixNano())
	Params.Init()
	core := &Core{
		ctx:    ctx,
		cancel: cancel,
	}
	core.stateCode.Store(internalpb2.StateCode_INITIALIZING)
	core.isInit.Store(false)
	return core, nil
}

func (c *Core) checkInit() error {
	if c.MetaTable == nil {
		return errors.Errorf("MetaTable is nil")
	}
	if c.idAllocator == nil {
		return errors.Errorf("idAllocator is nil")
	}
	if c.tsoAllocator == nil {
		return errors.Errorf("tsoAllocator is nil")
	}
	if c.etcdCli == nil {
		return errors.Errorf("etcdCli is nil")
	}
	if c.metaKV == nil {
		return errors.Errorf("metaKV is nil")
	}
	if c.kvBase == nil {
		return errors.Errorf("kvBase is nil")
	}
	if c.ProxyTimeTickChan == nil {
		return errors.Errorf("ProxyTimeTickChan is nil")
	}
	if c.ddReqQueue == nil {
		return errors.Errorf("ddReqQueue is nil")
	}
	if c.DdCreateCollectionReq == nil {
		return errors.Errorf("DdCreateCollectionReq is nil")
	}
	if c.DdDropCollectionReq == nil {
		return errors.Errorf("DdDropCollectionReq is nil")
	}
	if c.DdCreatePartitionReq == nil {
		return errors.Errorf("DdCreatePartitionReq is nil")
	}
	if c.DdDropPartitionReq == nil {
		return errors.Errorf("DdDropPartitionReq is nil")
	}
	if c.DataServiceSegmentChan == nil {
		return errors.Errorf("DataServiceSegmentChan is nil")
	}
	if c.GetBinlogFilePathsFromDataServiceReq == nil {
		return errors.Errorf("GetBinlogFilePathsFromDataServiceReq is nil")
	}
	if c.BuildIndexReq == nil {
		return errors.Errorf("BuildIndexReq is nil")
	}
	if c.InvalidateCollectionMetaCache == nil {
		return errors.Errorf("InvalidateCollectionMetaCache is nil")
	}
	if c.indexTaskQueue == nil {
		return errors.Errorf("indexTaskQueue is nil")
	}
	if c.DataNodeSegmentFlushCompletedChan == nil {
		return errors.Errorf("DataNodeSegmentFlushCompletedChan is nil")
	}
	log.Printf("master node id = %d\n", Params.NodeID)
	return nil
}

func (c *Core) startDdScheduler() {
	for {
		select {
		case <-c.ctx.Done():
			log.Printf("close dd scheduler, exit task execution loop")
			return
		case task, ok := <-c.ddReqQueue:
			if !ok {
				log.Printf("dd chan is closed, exit task execution loopo")
				return
			}
			ts, err := task.Ts()
			if err != nil {
				task.Notify(err)
				break
			}
			if !task.IgnoreTimeStamp() && ts <= c.lastDdTimeStamp {
				task.Notify(errors.Errorf("input timestamp = %d, last dd time stamp = %d", ts, c.lastDdTimeStamp))
				break
			}
			err = task.Execute()
			task.Notify(err)
			if ts > c.lastDdTimeStamp {
				c.lastDdTimeStamp = ts
			}
		}
	}
}

func (c *Core) startTimeTickLoop() {
	for {
		select {
		case <-c.ctx.Done():
			log.Printf("close master time tick loop")
			return
		case tt, ok := <-c.ProxyTimeTickChan:
			if !ok {
				log.Printf("proxyTimeTickStream is closed, exit time tick loop")
				return
			}
			if tt <= c.lastTimeTick {
				log.Printf("master time tick go back, last time tick = %d, input time tick = %d", c.lastTimeTick, tt)
			}
			if err := c.SendTimeTick(tt); err != nil {
				log.Printf("master send time tick into dd and time_tick channel failed: %s", err.Error())
			}
			c.lastTimeTick = tt
		}
	}
}

//data service send segment info to master when create segment
func (c *Core) startDataServiceSegmentLoop() {
	for {
		select {
		case <-c.ctx.Done():
			log.Printf("close data service segment loop")
			return
		case seg, ok := <-c.DataServiceSegmentChan:
			if !ok {
				log.Printf("data service segment is closed, exit loop")
				return
			}
			if seg == nil {
				log.Printf("segment from data service is nill")
			} else if err := c.MetaTable.AddSegment(seg); err != nil {
				//what if master add segment failed, but data service success?
				log.Printf("add segment info meta table failed ")
			}
		}
	}
}

//create index loop
func (c *Core) startCreateIndexLoop() {
	for {
		select {
		case <-c.ctx.Done():
			log.Printf("close create index loop")
			return
		case t, ok := <-c.indexTaskQueue:
			if !ok {
				log.Printf("index task chan has closed, exit loop")
				return
			}
			if err := t.BuildIndex(); err != nil {
				log.Printf("create index failed, error = %s", err.Error())
			}
		}
	}
}

func (c *Core) startSegmentFlushCompletedLoop() {
	for {
		select {
		case <-c.ctx.Done():
			log.Printf("close segment flush completed loop")
			return
		case seg, ok := <-c.DataNodeSegmentFlushCompletedChan:
			if !ok {
				log.Printf("data node segment flush completed chan has colsed, exit loop")
			}
			fields, err := c.MetaTable.GetSegmentVectorFields(seg)
			if err != nil {
				log.Printf("GetSegmentVectorFields, error = %s ", err.Error())
			}
			for _, f := range fields {
				t := &CreateIndexTask{
					core:        c,
					segmentID:   seg,
					indexName:   "index_" + strconv.FormatInt(f.FieldID, 10),
					fieldSchema: f,
					indexParams: nil,
				}
				c.indexTaskQueue <- t
			}
		}
	}
}

func (c *Core) setMsgStreams() error {
	//proxy time tick stream,
	proxyTimeTickStream := pulsarms.NewPulsarMsgStream(c.ctx, 1024)
	proxyTimeTickStream.SetPulsarClient(Params.PulsarAddress)
	proxyTimeTickStream.CreatePulsarConsumers([]string{Params.ProxyTimeTickChannel}, Params.MsgChannelSubName, util.NewUnmarshalDispatcher(), 1024)
	proxyTimeTickStream.Start()

	// master time tick channel
	timeTickStream := pulsarms.NewPulsarMsgStream(c.ctx, 1024)
	timeTickStream.SetPulsarClient(Params.PulsarAddress)
	timeTickStream.CreatePulsarProducers([]string{Params.TimeTickChannel})

	// master dd channel
	ddStream := pulsarms.NewPulsarMsgStream(c.ctx, 1024)
	ddStream.SetPulsarClient(Params.PulsarAddress)
	ddStream.CreatePulsarProducers([]string{Params.DdChannel})

	c.SendTimeTick = func(t typeutil.Timestamp) error {
		msgPack := ms.MsgPack{}
		baseMsg := ms.BaseMsg{
			MsgCtx:         nil,
			BeginTimestamp: t,
			EndTimestamp:   t,
			HashValues:     []uint32{0},
		}
		timeTickResult := internalpb2.TimeTickMsg{
			Base: &commonpb.MsgBase{
				MsgType:   commonpb.MsgType_kTimeTick,
				MsgID:     0,
				Timestamp: t,
				SourceID:  int64(Params.NodeID),
			},
		}
		timeTickMsg := &ms.TimeTickMsg{
			BaseMsg:     baseMsg,
			TimeTickMsg: timeTickResult,
		}
		msgPack.Msgs = append(msgPack.Msgs, timeTickMsg)
		if err := timeTickStream.Broadcast(&msgPack); err != nil {
			return err
		}
		if err := ddStream.Broadcast(&msgPack); err != nil {
			return err
		}
		return nil
	}

	c.DdCreateCollectionReq = func(req *internalpb2.CreateCollectionRequest) error {
		msgPack := ms.MsgPack{}
		baseMsg := ms.BaseMsg{
			BeginTimestamp: req.Base.Timestamp,
			EndTimestamp:   req.Base.Timestamp,
			HashValues:     []uint32{0},
		}
		collMsg := &ms.CreateCollectionMsg{
			BaseMsg:                 baseMsg,
			CreateCollectionRequest: *req,
		}
		msgPack.Msgs = append(msgPack.Msgs, collMsg)
		if err := ddStream.Broadcast(&msgPack); err != nil {
			return err
		}
		return nil
	}

	c.DdDropCollectionReq = func(req *internalpb2.DropCollectionRequest) error {
		//TODO, notify proxy to delete this collection before send this msg into dd channel
		msgPack := ms.MsgPack{}
		baseMsg := ms.BaseMsg{
			BeginTimestamp: req.Base.Timestamp,
			EndTimestamp:   req.Base.Timestamp,
			HashValues:     []uint32{0},
		}
		collMsg := &ms.DropCollectionMsg{
			BaseMsg:               baseMsg,
			DropCollectionRequest: *req,
		}
		msgPack.Msgs = append(msgPack.Msgs, collMsg)
		if err := ddStream.Broadcast(&msgPack); err != nil {
			return err
		}
		return nil
	}

	c.DdCreatePartitionReq = func(req *internalpb2.CreatePartitionRequest) error {
		msgPack := ms.MsgPack{}
		baseMsg := ms.BaseMsg{
			BeginTimestamp: req.Base.Timestamp,
			EndTimestamp:   req.Base.Timestamp,
			HashValues:     []uint32{0},
		}
		collMsg := &ms.CreatePartitionMsg{
			BaseMsg:                baseMsg,
			CreatePartitionRequest: *req,
		}
		msgPack.Msgs = append(msgPack.Msgs, collMsg)
		if err := ddStream.Broadcast(&msgPack); err != nil {
			return err
		}
		return nil
	}

	c.DdDropPartitionReq = func(req *internalpb2.DropPartitionRequest) error {
		msgPack := ms.MsgPack{}
		baseMsg := ms.BaseMsg{
			BeginTimestamp: req.Base.Timestamp,
			EndTimestamp:   req.Base.Timestamp,
			HashValues:     []uint32{0},
		}
		collMsg := &ms.DropPartitionMsg{
			BaseMsg:              baseMsg,
			DropPartitionRequest: *req,
		}
		msgPack.Msgs = append(msgPack.Msgs, collMsg)
		if err := ddStream.Broadcast(&msgPack); err != nil {
			return err
		}
		return nil
	}

	// receive time tick from msg stream
	go func() {
		c.ProxyTimeTickChan = make(chan typeutil.Timestamp, 1024)
		for {
			select {
			case <-c.ctx.Done():
				return
			case ttmsgs, ok := <-proxyTimeTickStream.Chan():
				if !ok {
					log.Printf("proxy time tick msg stream closed")
					return
				}
				if len(ttmsgs.Msgs) > 0 {
					for _, ttm := range ttmsgs.Msgs {
						ttmsg, ok := ttm.(*ms.TimeTickMsg)
						if !ok {
							continue
						}
						c.ProxyTimeTickChan <- ttmsg.Base.Timestamp
					}
				}
			}
		}
	}()

	//segment channel, data service create segment,or data node flush segment will put msg in this channel
	dataServiceStream := pulsarms.NewPulsarMsgStream(c.ctx, 1024)
	dataServiceStream.SetPulsarClient(Params.PulsarAddress)
	dataServiceStream.CreatePulsarConsumers([]string{Params.DataServiceSegmentChannel}, Params.MsgChannelSubName, util.NewUnmarshalDispatcher(), 1024)
	dataServiceStream.Start()
	c.DataServiceSegmentChan = make(chan *datapb.SegmentInfo, 1024)

	// receive segment info from msg stream
	go func() {
		for {
			select {
			case <-c.ctx.Done():
				return
			case segMsg, ok := <-dataServiceStream.Chan():
				if !ok {
					log.Printf("data service segment msg closed")
				}
				if len(segMsg.Msgs) > 0 {
					for _, segm := range segMsg.Msgs {
						segInfoMsg, ok := segm.(*ms.SegmentInfoMsg)
						if ok {
							c.DataServiceSegmentChan <- segInfoMsg.Segment
						} else {
							flushMsg, ok := segm.(*ms.FlushCompletedMsg)
							if ok {
								c.DataNodeSegmentFlushCompletedChan <- flushMsg.SegmentFlushCompletedMsg.SegmentID
							} else {
								log.Printf("receiver unexpected msg from data service stream, value = %v", segm)
							}
						}
					}
				}
			}
		}
	}()

	return nil
}

func (c *Core) Init(params *InitParams) error {
	var initError error = nil
	c.initOnce.Do(func() {
		Params.ProxyTimeTickChannel = params.ProxyTimeTickChannel
		if c.etcdCli, initError = clientv3.New(clientv3.Config{Endpoints: []string{Params.EtcdAddress}, DialTimeout: 5 * time.Second}); initError != nil {
			return
		}
		c.metaKV = etcdkv.NewEtcdKV(c.etcdCli, Params.MetaRootPath)
		if c.MetaTable, initError = NewMetaTable(c.metaKV); initError != nil {
			return
		}

		c.kvBase = etcdkv.NewEtcdKV(c.etcdCli, Params.KvRootPath)

		c.idAllocator = NewGlobalIDAllocator("idTimestamp", tsoutil.NewTSOKVBase([]string{Params.EtcdAddress}, Params.KvRootPath, "gid"))
		if initError = c.idAllocator.Initialize(); initError != nil {
			return
		}
		c.tsoAllocator = NewGlobalTSOAllocator("timestamp", tsoutil.NewTSOKVBase([]string{Params.EtcdAddress}, Params.KvRootPath, "tso"))
		if initError = c.tsoAllocator.Initialize(); initError != nil {
			return
		}
		c.ddReqQueue = make(chan reqTask, 1024)
		c.indexTaskQueue = make(chan *CreateIndexTask, 1024)
		initError = c.setMsgStreams()
		c.isInit.Store(true)
	})
	return initError
}

func (c *Core) Start() error {
	isInit := c.isInit.Load().(bool)
	if !isInit {
		return errors.Errorf("call init before start")
	}
	if err := c.checkInit(); err != nil {
		return err
	}
	c.startOnce.Do(func() {
		go c.startDdScheduler()
		go c.startTimeTickLoop()
		go c.startDataServiceSegmentLoop()
		go c.startCreateIndexLoop()
		go c.startSegmentFlushCompletedLoop()
		c.stateCode.Store(internalpb2.StateCode_HEALTHY)
	})
	return nil
}

func (c *Core) Stop() error {
	c.cancel()
	c.stateCode.Store(internalpb2.StateCode_ABNORMAL)
	return nil
}

func (c *Core) GetComponentStates(empty *commonpb.Empty) (*internalpb2.ComponentStates, error) {
	code := c.stateCode.Load().(internalpb2.StateCode)
	return &internalpb2.ComponentStates{
		State: &internalpb2.ComponentInfo{
			NodeID:    int64(Params.NodeID),
			Role:      "master",
			StateCode: code,
			ExtraInfo: nil,
		},
	}, nil
}

func (c *Core) GetTimeTickChannel(empty *commonpb.Empty) (*milvuspb.StringResponse, error) {
	return &milvuspb.StringResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		Value: Params.TimeTickChannel,
	}, nil
}

func (c *Core) GetDdChannel(empty *commonpb.Empty) (*milvuspb.StringResponse, error) {
	return &milvuspb.StringResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		Value: Params.DdChannel,
	}, nil
}

func (c *Core) GetStatisticsChannel(empty *commonpb.Empty) (*milvuspb.StringResponse, error) {
	return &milvuspb.StringResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		Value: Params.StatisticsChannel,
	}, nil
}

func (c *Core) CreateCollection(in *milvuspb.CreateCollectionRequest) (*commonpb.Status, error) {
	t := &CreateCollectionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
			Reason:    "Create collection failed: " + err.Error(),
		}, nil
	}
	return &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}, nil

}

func (c *Core) DropCollection(in *milvuspb.DropCollectionRequest) (*commonpb.Status, error) {
	t := &DropCollectionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
			Reason:    "Create collection failed: " + err.Error(),
		}, nil
	}
	return &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}, nil
}

func (c *Core) HasCollection(in *milvuspb.HasCollectionRequest) (*milvuspb.BoolResponse, error) {
	t := &HasCollectionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req:           in,
		HasCollection: false,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.BoolResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "Has collection failed: " + err.Error(),
			},
			Value: false,
		}, nil
	}
	return &milvuspb.BoolResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		Value: t.HasCollection,
	}, nil
}

func (c *Core) DescribeCollection(in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
	t := &DescribeCollectionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
		Rsp: &milvuspb.DescribeCollectionResponse{},
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.DescribeCollectionResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "describe collection failed: " + err.Error(),
			},
			Schema: nil,
		}, nil
	}
	t.Rsp.Status = &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}
	return t.Rsp, nil
}

func (c *Core) ShowCollections(in *milvuspb.ShowCollectionRequest) (*milvuspb.ShowCollectionResponse, error) {
	t := &ShowCollectionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
		Rsp: &milvuspb.ShowCollectionResponse{
			CollectionNames: nil,
		},
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.ShowCollectionResponse{
			CollectionNames: nil,
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "ShowCollections failed: " + err.Error(),
			},
		}, nil
	}
	t.Rsp.Status = &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}
	return t.Rsp, nil
}

func (c *Core) CreatePartition(in *milvuspb.CreatePartitionRequest) (*commonpb.Status, error) {
	t := &CreatePartitionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
			Reason:    "create partition failed: " + err.Error(),
		}, nil
	}
	return &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}, nil
}

func (c *Core) DropPartition(in *milvuspb.DropPartitionRequest) (*commonpb.Status, error) {
	t := &DropPartitionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
			Reason:    "DropPartition failed: " + err.Error(),
		}, nil
	}
	return &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}, nil
}

func (c *Core) HasPartition(in *milvuspb.HasPartitionRequest) (*milvuspb.BoolResponse, error) {
	t := &HasPartitionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req:          in,
		HasPartition: false,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.BoolResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "HasPartition failed: " + err.Error(),
			},
			Value: false,
		}, nil
	}
	return &milvuspb.BoolResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		Value: t.HasPartition,
	}, nil
}

func (c *Core) ShowPartitions(in *milvuspb.ShowPartitionRequest) (*milvuspb.ShowPartitionResponse, error) {
	t := &ShowPartitionReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
		Rsp: &milvuspb.ShowPartitionResponse{
			PartitionNames: nil,
			Status:         nil,
		},
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.ShowPartitionResponse{
			PartitionNames: nil,
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "ShowPartitions failed: " + err.Error(),
			},
		}, nil
	}
	t.Rsp.Status = &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}
	return t.Rsp, nil
}

func (c *Core) CreateIndex(in *milvuspb.CreateIndexRequest) (*commonpb.Status, error) {
	t := &CreateIndexReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
			Reason:    "CreateIndex failed, error = " + err.Error(),
		}, nil
	}
	return &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}, nil
}

func (c *Core) DescribeIndex(in *milvuspb.DescribeIndexRequest) (*milvuspb.DescribeIndexResponse, error) {
	t := &DescribeIndexReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
		Rsp: &milvuspb.DescribeIndexResponse{
			Status:            nil,
			IndexDescriptions: nil,
		},
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.DescribeIndexResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "DescribeIndex failed, error = " + err.Error(),
			},
			IndexDescriptions: nil,
		}, nil
	}
	t.Rsp.Status = &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}
	return t.Rsp, nil
}

func (c *Core) DescribeSegment(in *milvuspb.DescribeSegmentRequest) (*milvuspb.DescribeSegmentResponse, error) {
	t := &DescribeSegmentReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
		Rsp: &milvuspb.DescribeSegmentResponse{
			Status:  nil,
			IndexID: 0,
		},
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.DescribeSegmentResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "DescribeSegment failed, error = " + err.Error(),
			},
			IndexID: 0,
		}, nil
	}
	t.Rsp.Status = &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}
	return t.Rsp, nil
}

func (c *Core) ShowSegments(in *milvuspb.ShowSegmentRequest) (*milvuspb.ShowSegmentResponse, error) {
	t := &ShowSegmentReqTask{
		baseReqTask: baseReqTask{
			cv:   make(chan error),
			core: c,
		},
		Req: in,
		Rsp: &milvuspb.ShowSegmentResponse{
			Status:     nil,
			SegmentIDs: nil,
		},
	}
	c.ddReqQueue <- t
	err := t.WaitToFinish()
	if err != nil {
		return &milvuspb.ShowSegmentResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "ShowSegments failed, error: " + err.Error(),
			},
			SegmentIDs: nil,
		}, nil
	}
	t.Rsp.Status = &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_SUCCESS,
		Reason:    "",
	}
	return t.Rsp, nil
}

func (c *Core) AllocTimestamp(in *masterpb.TsoRequest) (*masterpb.TsoResponse, error) {
	ts, err := c.tsoAllocator.Alloc(in.Count)
	if err != nil {
		return &masterpb.TsoResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "AllocTimestamp failed: " + err.Error(),
			},
			Timestamp: 0,
			Count:     0,
		}, nil
	}
	return &masterpb.TsoResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		Timestamp: ts,
		Count:     in.Count,
	}, nil
}

func (c *Core) AllocID(in *masterpb.IDRequest) (*masterpb.IDResponse, error) {
	start, _, err := c.idAllocator.Alloc(in.Count)
	if err != nil {
		return &masterpb.IDResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    "AllocID failed: " + err.Error(),
			},
			ID:    0,
			Count: in.Count,
		}, nil
	}
	return &masterpb.IDResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
			Reason:    "",
		},
		ID:    start,
		Count: in.Count,
	}, nil
}