diff --git a/internal/allocator/id.go b/internal/allocator/id.go
index 29a49f141a..6bdd969d3c 100644
--- a/internal/allocator/id.go
+++ b/internal/allocator/id.go
@@ -35,6 +35,7 @@ type UniqueID = typeutil.UniqueID
 type IDAllocator struct {
 	Allocator
 
+	etcdAddr      []string
 	masterAddress string
 	masterClient  types.MasterService
 
@@ -46,7 +47,7 @@ type IDAllocator struct {
 	PeerID UniqueID
 }
 
-func NewIDAllocator(ctx context.Context, masterAddr string) (*IDAllocator, error) {
+func NewIDAllocator(ctx context.Context, masterAddr string, etcdAddr []string) (*IDAllocator, error) {
 
 	ctx1, cancel := context.WithCancel(ctx)
 	a := &IDAllocator{
@@ -56,6 +57,7 @@ func NewIDAllocator(ctx context.Context, masterAddr string) (*IDAllocator, error
 			Role:       "IDAllocator",
 		},
 		countPerRPC:   IDCountPerRPC,
+		etcdAddr:      etcdAddr,
 		masterAddress: masterAddr,
 	}
 	a.TChan = &EmptyTicker{}
@@ -69,7 +71,8 @@ func NewIDAllocator(ctx context.Context, masterAddr string) (*IDAllocator, error
 
 func (ia *IDAllocator) Start() error {
 	var err error
-	ia.masterClient, err = msc.NewClient(ia.masterAddress, 20*time.Second)
+
+	ia.masterClient, err = msc.NewClient(ia.masterAddress, ia.etcdAddr, 20*time.Second)
 	if err != nil {
 		panic(err)
 	}
diff --git a/internal/datanode/data_node.go b/internal/datanode/data_node.go
index e814b0f0f3..d00787a540 100644
--- a/internal/datanode/data_node.go
+++ b/internal/datanode/data_node.go
@@ -138,9 +138,8 @@ func (node *DataNode) SetDataServiceInterface(ds types.DataService) error {
 func (node *DataNode) Init() error {
 	ctx := context.Background()
 
-	node.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress}, typeutil.DataNodeRole,
-		Params.IP+":"+strconv.Itoa(Params.Port), false)
-	node.session.Init()
+	node.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress})
+	node.session.Init(typeutil.DataNodeRole, Params.IP+":"+strconv.Itoa(Params.Port), false)
 
 	req := &datapb.RegisterNodeRequest{
 		Base: &commonpb.MsgBase{
diff --git a/internal/dataservice/server.go b/internal/dataservice/server.go
index d6369d01a7..80939a168c 100644
--- a/internal/dataservice/server.go
+++ b/internal/dataservice/server.go
@@ -108,9 +108,8 @@ func (s *Server) SetMasterClient(masterClient types.MasterService) {
 }
 
 func (s *Server) Init() error {
-	s.session = sessionutil.NewSession(s.ctx, []string{Params.EtcdAddress}, typeutil.DataServiceRole,
-		Params.IP, true)
-	s.session.Init()
+	s.session = sessionutil.NewSession(s.ctx, []string{Params.EtcdAddress})
+	s.session.Init(typeutil.DataServiceRole, Params.IP, true)
 	return nil
 }
 
diff --git a/internal/dataservice/server_test.go b/internal/dataservice/server_test.go
index 7c95036a48..f0e6ab1df8 100644
--- a/internal/dataservice/server_test.go
+++ b/internal/dataservice/server_test.go
@@ -23,6 +23,7 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/internalpb"
 	"github.com/milvus-io/milvus/internal/types"
 	"github.com/milvus-io/milvus/internal/util/retry"
+	"github.com/milvus-io/milvus/internal/util/sessionutil"
 	"github.com/milvus-io/milvus/internal/util/typeutil"
 	"github.com/stretchr/testify/assert"
 	"go.etcd.io/etcd/clientv3"
@@ -787,7 +788,7 @@ func newTestServer(t *testing.T) *Server {
 
 	etcdCli, err := initEtcd(Params.EtcdAddress)
 	assert.Nil(t, err)
-	_, err = etcdCli.Delete(context.Background(), "/session", clientv3.WithPrefix())
+	_, err = etcdCli.Delete(context.Background(), sessionutil.DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 
 	svr, err := CreateServer(context.TODO(), factory)
diff --git a/internal/distributed/datanode/service.go b/internal/distributed/datanode/service.go
index 0ec31b52bb..e3493e31ce 100644
--- a/internal/distributed/datanode/service.go
+++ b/internal/distributed/datanode/service.go
@@ -70,7 +70,7 @@ func NewServer(ctx context.Context, factory msgstream.Factory) (*Server, error)
 		msFactory:   factory,
 		grpcErrChan: make(chan error),
 		newMasterServiceClient: func(s string) (types.MasterService, error) {
-			return msc.NewClient(s, 20*time.Second)
+			return msc.NewClient(s, []string{dn.Params.EtcdAddress}, 20*time.Second)
 		},
 		newDataServiceClient: func(s string) types.DataService {
 			return dsc.NewClient(Params.DataServiceAddress)
diff --git a/internal/distributed/dataservice/service.go b/internal/distributed/dataservice/service.go
index d16b1cb868..ab296e9794 100644
--- a/internal/distributed/dataservice/service.go
+++ b/internal/distributed/dataservice/service.go
@@ -68,7 +68,7 @@ func NewServer(ctx context.Context, factory msgstream.Factory) (*Server, error)
 		cancel:      cancel,
 		grpcErrChan: make(chan error),
 		newMasterServiceClient: func(s string) (types.MasterService, error) {
-			return msc.NewClient(s, 10*time.Second)
+			return msc.NewClient(s, []string{dataservice.Params.EtcdAddress}, 10*time.Second)
 		},
 	}
 	s.dataService, err = dataservice.CreateServer(s.ctx, factory)
diff --git a/internal/distributed/masterservice/client/client.go b/internal/distributed/masterservice/client/client.go
index 68c87f4674..3f51ef223c 100644
--- a/internal/distributed/masterservice/client/client.go
+++ b/internal/distributed/masterservice/client/client.go
@@ -13,12 +13,16 @@ package grpcmasterserviceclient
 
 import (
 	"context"
+	"fmt"
+	"path"
 	"time"
 
 	"github.com/milvus-io/milvus/internal/proto/commonpb"
 	"github.com/milvus-io/milvus/internal/proto/internalpb"
 	"github.com/milvus-io/milvus/internal/proto/masterpb"
 	"github.com/milvus-io/milvus/internal/proto/milvuspb"
+	"github.com/milvus-io/milvus/internal/util/sessionutil"
+	"github.com/milvus-io/milvus/internal/util/typeutil"
 	otgrpc "github.com/opentracing-contrib/go-grpc"
 	"github.com/opentracing/opentracing-go"
 	"google.golang.org/grpc"
@@ -30,30 +34,59 @@ type GrpcClient struct {
 	conn       *grpc.ClientConn
 
 	//inner member
-	addr        string
-	timeout     time.Duration
-	grpcTimeout time.Duration
-	retry       int
+	addr      string
+	timeout   time.Duration
+	reconnTry int
+	recallTry int
+
+	sess *sessionutil.Session
 }
 
-func NewClient(addr string, timeout time.Duration) (*GrpcClient, error) {
+func getMasterServiceAddr(sess *sessionutil.Session) (string, error) {
+	msess, err := sess.GetSessions(typeutil.MasterServiceRole)
+	if err != nil {
+		return "", err
+	}
+	key := path.Join(sessionutil.DefaultServiceRoot, typeutil.MasterServiceRole)
+	var ms *sessionutil.Session
+	var ok bool
+	if ms, ok = msess[key]; !ok {
+		return "", fmt.Errorf("number of master service is incorrect, %d", len(msess))
+	}
+	return ms.Address, nil
+}
+
+func NewClient(addr string, etcdAddr []string, timeout time.Duration) (*GrpcClient, error) {
+	sess := sessionutil.NewSession(context.Background(), etcdAddr)
+
+	if addr == "" {
+		var err error
+		if addr, err = getMasterServiceAddr(sess); err != nil {
+			return nil, err
+		}
+	}
+
 	return &GrpcClient{
-		grpcClient:  nil,
-		conn:        nil,
-		addr:        addr,
-		timeout:     timeout,
-		grpcTimeout: time.Second * 5,
-		retry:       300,
+		grpcClient: nil,
+		conn:       nil,
+		addr:       addr,
+		timeout:    timeout,
+		reconnTry:  300,
+		recallTry:  3,
+		sess:       sess,
 	}, nil
 }
 
-func (c *GrpcClient) Init() error {
+func (c *GrpcClient) reconnect() error {
+	addr, err := getMasterServiceAddr(c.sess)
+	if err != nil {
+		return nil
+	}
 	tracer := opentracing.GlobalTracer()
 	ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
 	defer cancel()
-	var err error
-	for i := 0; i < c.retry; i++ {
-		if c.conn, err = grpc.DialContext(ctx, c.addr, grpc.WithInsecure(), grpc.WithBlock(),
+	for i := 0; i < c.reconnTry; i++ {
+		if c.conn, err = grpc.DialContext(ctx, addr, grpc.WithInsecure(), grpc.WithBlock(),
 			grpc.WithUnaryInterceptor(
 				otgrpc.OpenTracingClientInterceptor(tracer)),
 			grpc.WithStreamInterceptor(
@@ -68,6 +101,27 @@ func (c *GrpcClient) Init() error {
 	return nil
 }
 
+func (c *GrpcClient) Init() error {
+	tracer := opentracing.GlobalTracer()
+	ctx, cancel := context.WithTimeout(context.Background(), c.timeout)
+	defer cancel()
+	var err error
+	for i := 0; i < c.reconnTry; i++ {
+		if c.conn, err = grpc.DialContext(ctx, c.addr, grpc.WithInsecure(), grpc.WithBlock(),
+			grpc.WithUnaryInterceptor(
+				otgrpc.OpenTracingClientInterceptor(tracer)),
+			grpc.WithStreamInterceptor(
+				otgrpc.OpenTracingStreamClientInterceptor(tracer))); err == nil {
+			break
+		}
+	}
+	if err != nil {
+		return c.reconnect()
+	}
+	c.grpcClient = masterpb.NewMasterServiceClient(c.conn)
+	return nil
+}
+
 func (c *GrpcClient) Start() error {
 	return nil
 }
@@ -75,91 +129,171 @@ func (c *GrpcClient) Stop() error {
 	return c.conn.Close()
 }
 
+func (c *GrpcClient) recall(caller func() (interface{}, error)) (interface{}, error) {
+	ret, err := caller()
+	if err == nil {
+		return ret, nil
+	}
+	for i := 0; i < c.recallTry; i++ {
+		err = c.reconnect()
+		if err == nil {
+			ret, err = caller()
+			if err == nil {
+				return ret, nil
+			}
+		}
+	}
+	return ret, err
+}
+
 // TODO: timeout need to be propagated through ctx
 func (c *GrpcClient) GetComponentStates(ctx context.Context) (*internalpb.ComponentStates, error) {
-	return c.grpcClient.GetComponentStates(ctx, &internalpb.GetComponentStatesRequest{})
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.GetComponentStates(ctx, &internalpb.GetComponentStatesRequest{})
+	})
+	return ret.(*internalpb.ComponentStates), err
 }
 func (c *GrpcClient) GetTimeTickChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
-	return c.grpcClient.GetTimeTickChannel(ctx, &internalpb.GetTimeTickChannelRequest{})
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.GetTimeTickChannel(ctx, &internalpb.GetTimeTickChannelRequest{})
+	})
+	return ret.(*milvuspb.StringResponse), err
 }
 
 //just define a channel, not used currently
 func (c *GrpcClient) GetStatisticsChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
-	return c.grpcClient.GetStatisticsChannel(ctx, &internalpb.GetStatisticsChannelRequest{})
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.GetStatisticsChannel(ctx, &internalpb.GetStatisticsChannelRequest{})
+	})
+	return ret.(*milvuspb.StringResponse), err
 }
 
 //receive ddl from rpc and time tick from proxy service, and put them into this channel
 func (c *GrpcClient) GetDdChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
-	return c.grpcClient.GetDdChannel(ctx, &internalpb.GetDdChannelRequest{})
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.GetDdChannel(ctx, &internalpb.GetDdChannelRequest{})
+	})
+	return ret.(*milvuspb.StringResponse), err
 }
 
 //DDL request
 func (c *GrpcClient) CreateCollection(ctx context.Context, in *milvuspb.CreateCollectionRequest) (*commonpb.Status, error) {
-	return c.grpcClient.CreateCollection(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.CreateCollection(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
 
 func (c *GrpcClient) DropCollection(ctx context.Context, in *milvuspb.DropCollectionRequest) (*commonpb.Status, error) {
-	return c.grpcClient.DropCollection(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.DropCollection(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
+
 func (c *GrpcClient) HasCollection(ctx context.Context, in *milvuspb.HasCollectionRequest) (*milvuspb.BoolResponse, error) {
-	return c.grpcClient.HasCollection(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.HasCollection(ctx, in)
+	})
+	return ret.(*milvuspb.BoolResponse), err
 }
 func (c *GrpcClient) DescribeCollection(ctx context.Context, in *milvuspb.DescribeCollectionRequest) (*milvuspb.DescribeCollectionResponse, error) {
-	return c.grpcClient.DescribeCollection(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.DescribeCollection(ctx, in)
+	})
+	return ret.(*milvuspb.DescribeCollectionResponse), err
 }
 
 func (c *GrpcClient) ShowCollections(ctx context.Context, in *milvuspb.ShowCollectionsRequest) (*milvuspb.ShowCollectionsResponse, error) {
-	return c.grpcClient.ShowCollections(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.ShowCollections(ctx, in)
+	})
+	return ret.(*milvuspb.ShowCollectionsResponse), err
 }
-
 func (c *GrpcClient) CreatePartition(ctx context.Context, in *milvuspb.CreatePartitionRequest) (*commonpb.Status, error) {
-	return c.grpcClient.CreatePartition(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.CreatePartition(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
 
 func (c *GrpcClient) DropPartition(ctx context.Context, in *milvuspb.DropPartitionRequest) (*commonpb.Status, error) {
-	return c.grpcClient.DropPartition(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.DropPartition(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
 
 func (c *GrpcClient) HasPartition(ctx context.Context, in *milvuspb.HasPartitionRequest) (*milvuspb.BoolResponse, error) {
-	return c.grpcClient.HasPartition(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.HasPartition(ctx, in)
+	})
+	return ret.(*milvuspb.BoolResponse), err
 }
 
 func (c *GrpcClient) ShowPartitions(ctx context.Context, in *milvuspb.ShowPartitionsRequest) (*milvuspb.ShowPartitionsResponse, error) {
-	return c.grpcClient.ShowPartitions(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.ShowPartitions(ctx, in)
+	})
+	return ret.(*milvuspb.ShowPartitionsResponse), err
 }
 
 //index builder service
 func (c *GrpcClient) CreateIndex(ctx context.Context, in *milvuspb.CreateIndexRequest) (*commonpb.Status, error) {
-	return c.grpcClient.CreateIndex(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.CreateIndex(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
 
 func (c *GrpcClient) DropIndex(ctx context.Context, in *milvuspb.DropIndexRequest) (*commonpb.Status, error) {
-	return c.grpcClient.DropIndex(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.DropIndex(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
 
 func (c *GrpcClient) DescribeIndex(ctx context.Context, in *milvuspb.DescribeIndexRequest) (*milvuspb.DescribeIndexResponse, error) {
-	return c.grpcClient.DescribeIndex(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.DescribeIndex(ctx, in)
+	})
+	return ret.(*milvuspb.DescribeIndexResponse), err
 }
 
 //global timestamp allocator
 func (c *GrpcClient) AllocTimestamp(ctx context.Context, in *masterpb.AllocTimestampRequest) (*masterpb.AllocTimestampResponse, error) {
-	return c.grpcClient.AllocTimestamp(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.AllocTimestamp(ctx, in)
+	})
+	return ret.(*masterpb.AllocTimestampResponse), err
 }
 
 func (c *GrpcClient) AllocID(ctx context.Context, in *masterpb.AllocIDRequest) (*masterpb.AllocIDResponse, error) {
-	return c.grpcClient.AllocID(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.AllocID(ctx, in)
+	})
+	return ret.(*masterpb.AllocIDResponse), err
 }
 
 // UpdateChannelTimeTick used to handle ChannelTimeTickMsg
 func (c *GrpcClient) UpdateChannelTimeTick(ctx context.Context, in *internalpb.ChannelTimeTickMsg) (*commonpb.Status, error) {
-	return c.grpcClient.UpdateChannelTimeTick(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.UpdateChannelTimeTick(ctx, in)
+	})
+	return ret.(*commonpb.Status), err
 }
 
 //receiver time tick from proxy service, and put it into this channel
 func (c *GrpcClient) DescribeSegment(ctx context.Context, in *milvuspb.DescribeSegmentRequest) (*milvuspb.DescribeSegmentResponse, error) {
-	return c.grpcClient.DescribeSegment(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.DescribeSegment(ctx, in)
+	})
+	return ret.(*milvuspb.DescribeSegmentResponse), err
 }
 
 func (c *GrpcClient) ShowSegments(ctx context.Context, in *milvuspb.ShowSegmentsRequest) (*milvuspb.ShowSegmentsResponse, error) {
-	return c.grpcClient.ShowSegments(ctx, in)
+	ret, err := c.recall(func() (interface{}, error) {
+		return c.grpcClient.ShowSegments(ctx, in)
+	})
+	return ret.(*milvuspb.ShowSegmentsResponse), err
 }
diff --git a/internal/distributed/masterservice/masterservice_test.go b/internal/distributed/masterservice/masterservice_test.go
index f977415b49..12e4b56703 100644
--- a/internal/distributed/masterservice/masterservice_test.go
+++ b/internal/distributed/masterservice/masterservice_test.go
@@ -35,6 +35,7 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/schemapb"
 	"github.com/milvus-io/milvus/internal/types"
 	"github.com/milvus-io/milvus/internal/util/retry"
+	"github.com/milvus-io/milvus/internal/util/sessionutil"
 	"github.com/milvus-io/milvus/internal/util/typeutil"
 	"github.com/stretchr/testify/assert"
 	"go.etcd.io/etcd/clientv3"
@@ -86,7 +87,7 @@ func TestGrpcService(t *testing.T) {
 
 	etcdCli, err := initEtcd(cms.Params.EtcdAddress)
 	assert.Nil(t, err)
-	_, err = etcdCli.Delete(ctx, "/session", clientv3.WithPrefix())
+	_, err = etcdCli.Delete(ctx, sessionutil.DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 
 	err = core.Init()
@@ -171,7 +172,7 @@ func TestGrpcService(t *testing.T) {
 
 	svr.masterService.UpdateStateCode(internalpb.StateCode_Healthy)
 
-	cli, err := grpcmasterserviceclient.NewClient(Params.Address, 3*time.Second)
+	cli, err := grpcmasterserviceclient.NewClient(Params.Address, []string{cms.Params.EtcdAddress}, 3*time.Second)
 	assert.Nil(t, err)
 
 	err = cli.Init()
@@ -871,7 +872,7 @@ func TestRun(t *testing.T) {
 
 	etcdCli, err := initEtcd(cms.Params.EtcdAddress)
 	assert.Nil(t, err)
-	_, err = etcdCli.Delete(ctx, "/session", clientv3.WithPrefix())
+	_, err = etcdCli.Delete(ctx, sessionutil.DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 	err = svr.Run()
 	assert.Nil(t, err)
diff --git a/internal/distributed/proxynode/service.go b/internal/distributed/proxynode/service.go
index 0aab245e5b..ded087a135 100644
--- a/internal/distributed/proxynode/service.go
+++ b/internal/distributed/proxynode/service.go
@@ -184,7 +184,7 @@ func (s *Server) init() error {
 	masterServiceAddr := Params.MasterAddress
 	log.Debug("proxynode", zap.String("master address", masterServiceAddr))
 	timeout := 3 * time.Second
-	s.masterServiceClient, err = grpcmasterserviceclient.NewClient(masterServiceAddr, timeout)
+	s.masterServiceClient, err = grpcmasterserviceclient.NewClient(masterServiceAddr, []string{proxynode.Params.EtcdAddress}, timeout)
 	if err != nil {
 		return err
 	}
diff --git a/internal/distributed/querynode/service.go b/internal/distributed/querynode/service.go
index c768dfc919..56f88011f2 100644
--- a/internal/distributed/querynode/service.go
+++ b/internal/distributed/querynode/service.go
@@ -130,7 +130,7 @@ func (s *Server) init() error {
 	log.Debug("Master service", zap.String("address", addr))
 	log.Debug("Init master service client ...")
 
-	masterService, err := msc.NewClient(addr, 20*time.Second)
+	masterService, err := msc.NewClient(addr, []string{qn.Params.EtcdAddress}, 20*time.Second)
 	if err != nil {
 		panic(err)
 	}
diff --git a/internal/distributed/queryservice/service.go b/internal/distributed/queryservice/service.go
index 492c23201a..65c83138c3 100644
--- a/internal/distributed/queryservice/service.go
+++ b/internal/distributed/queryservice/service.go
@@ -107,7 +107,7 @@ func (s *Server) init() error {
 	log.Debug("Master service", zap.String("address", Params.MasterAddress))
 	log.Debug("Init master service client ...")
 
-	masterService, err := msc.NewClient(Params.MasterAddress, 20*time.Second)
+	masterService, err := msc.NewClient(Params.MasterAddress, []string{qs.Params.EtcdAddress}, 20*time.Second)
 
 	if err != nil {
 		panic(err)
diff --git a/internal/indexnode/indexnode.go b/internal/indexnode/indexnode.go
index 1ed458be6c..1361b2e4b5 100644
--- a/internal/indexnode/indexnode.go
+++ b/internal/indexnode/indexnode.go
@@ -79,9 +79,8 @@ func NewIndexNode(ctx context.Context) (*IndexNode, error) {
 
 func (i *IndexNode) Init() error {
 	ctx := context.Background()
-	i.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress}, typeutil.IndexNodeRole,
-		Params.IP+":"+strconv.Itoa(Params.Port), false)
-	i.session.Init()
+	i.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress})
+	i.session.Init(typeutil.IndexNodeRole, Params.IP+":"+strconv.Itoa(Params.Port), false)
 
 	err := funcutil.WaitForComponentHealthy(ctx, i.serviceClient, "IndexService", 1000000, time.Millisecond*200)
 	if err != nil {
diff --git a/internal/indexservice/indexservice.go b/internal/indexservice/indexservice.go
index 516af34f84..73fb4c82bd 100644
--- a/internal/indexservice/indexservice.go
+++ b/internal/indexservice/indexservice.go
@@ -89,9 +89,8 @@ func (i *IndexService) Init() error {
 	log.Debug("indexservice", zap.String("etcd address", Params.EtcdAddress))
 
 	ctx := context.Background()
-	i.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress}, typeutil.IndexServiceRole,
-		Params.Address, true)
-	i.session.Init()
+	i.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress})
+	i.session.Init(typeutil.IndexServiceRole, Params.Address, true)
 
 	connectEtcdFn := func() error {
 		etcdClient, err := clientv3.New(clientv3.Config{Endpoints: []string{Params.EtcdAddress}})
diff --git a/internal/masterservice/master_service.go b/internal/masterservice/master_service.go
index 5d86cf3683..f3755aba38 100644
--- a/internal/masterservice/master_service.go
+++ b/internal/masterservice/master_service.go
@@ -821,9 +821,8 @@ func (c *Core) BuildIndex(segID typeutil.UniqueID, field *schemapb.FieldSchema,
 func (c *Core) Init() error {
 	var initError error = nil
 	c.initOnce.Do(func() {
-		c.session = sessionutil.NewSession(c.ctx, []string{Params.EtcdAddress}, typeutil.MasterServiceRole,
-			Params.Address, true)
-		c.session.Init()
+		c.session = sessionutil.NewSession(c.ctx, []string{Params.EtcdAddress})
+		c.session.Init(typeutil.MasterServiceRole, Params.Address, true)
 
 		connectEtcdFn := func() error {
 			if c.etcdCli, initError = clientv3.New(clientv3.Config{Endpoints: []string{Params.EtcdAddress}, DialTimeout: 5 * time.Second}); initError != nil {
diff --git a/internal/masterservice/master_service_test.go b/internal/masterservice/master_service_test.go
index 33995be4b2..56f737c858 100644
--- a/internal/masterservice/master_service_test.go
+++ b/internal/masterservice/master_service_test.go
@@ -16,6 +16,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/rand"
+	"path"
 	"sync"
 	"testing"
 	"time"
@@ -218,10 +219,10 @@ func TestMasterService(t *testing.T) {
 
 	etcdCli, err := clientv3.New(clientv3.Config{Endpoints: []string{Params.EtcdAddress}, DialTimeout: 5 * time.Second})
 	assert.Nil(t, err)
-	_, err = etcdCli.Delete(ctx, ProxyNodeSessionPrefix, clientv3.WithPrefix())
+	_, err = etcdCli.Delete(ctx, sessionutil.DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 	defer func() {
-		_, _ = etcdCli.Delete(ctx, ProxyNodeSessionPrefix, clientv3.WithPrefix())
+		_, _ = etcdCli.Delete(ctx, sessionutil.DefaultServiceRoot, clientv3.WithPrefix())
 	}()
 
 	pm := &proxyMock{
@@ -253,14 +254,6 @@ func TestMasterService(t *testing.T) {
 	err = core.SetQueryService(qm)
 	assert.Nil(t, err)
 
-	//TODO initialize master's session manager before core init
-	/*
-		self := sessionutil.NewSession("masterservice", funcutil.GetLocalIP()+":"+strconv.Itoa(53100), true)
-		sm := sessionutil.NewSessionManager(ctx, Params.EtcdAddress, Params.MetaRootPath, self)
-		sm.Init()
-		sessionutil.SetGlobalSessionManager(sm)
-	*/
-
 	err = core.Init()
 	assert.Nil(t, err)
 
@@ -1458,9 +1451,9 @@ func TestMasterService(t *testing.T) {
 		s2, err := json.Marshal(&p2)
 		assert.Nil(t, err)
 
-		_, err = core.etcdCli.Put(ctx2, ProxyNodeSessionPrefix+"-1", string(s1))
+		_, err = core.etcdCli.Put(ctx2, path.Join(sessionutil.DefaultServiceRoot, typeutil.ProxyNodeRole)+"-1", string(s1))
 		assert.Nil(t, err)
-		_, err = core.etcdCli.Put(ctx2, ProxyNodeSessionPrefix+"-2", string(s2))
+		_, err = core.etcdCli.Put(ctx2, path.Join(sessionutil.DefaultServiceRoot, typeutil.ProxyNodeRole)+"-2", string(s2))
 		assert.Nil(t, err)
 		time.Sleep(time.Second)
 
diff --git a/internal/masterservice/timeticksync.go b/internal/masterservice/timeticksync.go
index 50bec1fb70..c727a4fe7e 100644
--- a/internal/masterservice/timeticksync.go
+++ b/internal/masterservice/timeticksync.go
@@ -15,6 +15,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"path"
 	"sync"
 
 	"github.com/coreos/etcd/mvcc/mvccpb"
@@ -38,9 +39,6 @@ type timetickSync struct {
 	sendChan      chan map[typeutil.UniqueID]*internalpb.ChannelTimeTickMsg
 }
 
-// ProxyNodeSessionPrefix used for etcd watch
-const ProxyNodeSessionPrefix = "session/proxynode"
-
 func newTimeTickSync(ctx context.Context, factory msgstream.Factory, cli *clientv3.Client) (*timetickSync, error) {
 	tss := timetickSync{
 		lock:          sync.Mutex{},
@@ -109,7 +107,8 @@ func (t *timetickSync) UpdateTimeTick(in *internalpb.ChannelTimeTickMsg) error {
 
 // StartWatch watch proxy node change and process all channels' timetick msg
 func (t *timetickSync) StartWatch() {
-	rch := t.etcdCli.Watch(t.ctx, ProxyNodeSessionPrefix, clientv3.WithPrefix(), clientv3.WithCreatedNotify())
+	proxyNodePrefix := path.Join(sessionutil.DefaultServiceRoot, typeutil.ProxyNodeRole)
+	rch := t.etcdCli.Watch(t.ctx, proxyNodePrefix, clientv3.WithPrefix(), clientv3.WithCreatedNotify())
 	for {
 		select {
 		case <-t.ctx.Done():
diff --git a/internal/proxynode/proxy_node.go b/internal/proxynode/proxy_node.go
index dbea072d83..e43c8dc788 100644
--- a/internal/proxynode/proxy_node.go
+++ b/internal/proxynode/proxy_node.go
@@ -89,9 +89,8 @@ func (node *ProxyNode) Init() error {
 	// todo wait for proxyservice state changed to Healthy
 	ctx := context.Background()
 
-	node.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress}, typeutil.ProxyNodeRole,
-		Params.NetworkAddress, false)
-	node.session.Init()
+	node.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress})
+	node.session.Init(typeutil.ProxyNodeRole, Params.NetworkAddress, false)
 
 	err := funcutil.WaitForComponentHealthy(ctx, node.proxyService, "ProxyService", 1000000, time.Millisecond*200)
 	if err != nil {
@@ -177,7 +176,7 @@ func (node *ProxyNode) Init() error {
 	log.Debug("create query message stream ...")
 
 	masterAddr := Params.MasterAddress
-	idAllocator, err := allocator.NewIDAllocator(node.ctx, masterAddr)
+	idAllocator, err := allocator.NewIDAllocator(node.ctx, masterAddr, []string{Params.EtcdAddress})
 
 	if err != nil {
 		return err
diff --git a/internal/querynode/query_node.go b/internal/querynode/query_node.go
index eb614975a9..e86e6fd722 100644
--- a/internal/querynode/query_node.go
+++ b/internal/querynode/query_node.go
@@ -121,9 +121,8 @@ func NewQueryNodeWithoutID(ctx context.Context, factory msgstream.Factory) *Quer
 func (node *QueryNode) Init() error {
 	ctx := context.Background()
 
-	node.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress}, typeutil.QueryNodeRole,
-		Params.QueryNodeIP+":"+strconv.FormatInt(Params.QueryNodePort, 10), false)
-	node.session.Init()
+	node.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress})
+	node.session.Init(typeutil.QueryNodeRole, Params.QueryNodeIP+":"+strconv.FormatInt(Params.QueryNodePort, 10), false)
 
 	C.SegcoreInit()
 	registerReq := &queryPb.RegisterNodeRequest{
diff --git a/internal/queryservice/queryservice.go b/internal/queryservice/queryservice.go
index 7d80d93e09..028b15e660 100644
--- a/internal/queryservice/queryservice.go
+++ b/internal/queryservice/queryservice.go
@@ -59,9 +59,8 @@ type QueryService struct {
 func (qs *QueryService) Init() error {
 	ctx := context.Background()
 
-	qs.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress}, typeutil.QueryServiceRole,
-		Params.Address, true)
-	qs.session.Init()
+	qs.session = sessionutil.NewSession(ctx, []string{Params.EtcdAddress})
+	qs.session.Init(typeutil.QueryServiceRole, Params.Address, true)
 	return nil
 }
 
diff --git a/internal/util/sessionutil/session_util.go b/internal/util/sessionutil/session_util.go
index 11c85caa88..03a3267622 100644
--- a/internal/util/sessionutil/session_util.go
+++ b/internal/util/sessionutil/session_util.go
@@ -16,10 +16,10 @@ import (
 	"go.uber.org/zap"
 )
 
-const defaultServiceRoot = "/session/"
-const defaultIDKey = "id"
-const defaultRetryTimes = 30
-const defaultTTL = 10
+const DefaultServiceRoot = "/session/"
+const DefaultIDKey = "id"
+const DefaultRetryTimes = 30
+const DefaultTTL = 10
 
 // Session is a struct to store service's session, including ServerID, ServerName,
 // Address.
@@ -38,14 +38,11 @@ type Session struct {
 
 // NewSession is a helper to build Session object.LeaseID will be assigned after
 // registeration.
-func NewSession(ctx context.Context, etcdAddress []string, serverName, address string, exclusive bool) *Session {
+func NewSession(ctx context.Context, etcdAddress []string) *Session {
 	ctx, cancel := context.WithCancel(ctx)
 	session := &Session{
-		ctx:        ctx,
-		ServerName: serverName,
-		Address:    address,
-		Exclusive:  exclusive,
-		cancel:     cancel,
+		ctx:    ctx,
+		cancel: cancel,
 	}
 
 	connectEtcdFn := func() error {
@@ -65,7 +62,10 @@ func NewSession(ctx context.Context, etcdAddress []string, serverName, address s
 
 // Init will initialize base struct in the SessionManager, including getServerID,
 // and process keepAliveResponse
-func (s *Session) Init() {
+func (s *Session) Init(serverName, address string, exclusive bool) {
+	s.ServerName = serverName
+	s.Address = address
+	s.Exclusive = exclusive
 	s.checkIDExist()
 	serverID, err := s.getServerID()
 	if err != nil {
@@ -82,23 +82,23 @@ func (s *Session) Init() {
 // GetServerID gets id from etcd with key: metaRootPath + "/services/id"
 // Each server get ServerID and add one to id.
 func (s *Session) getServerID() (int64, error) {
-	return s.getServerIDWithKey(defaultIDKey, defaultRetryTimes)
+	return s.getServerIDWithKey(DefaultIDKey, DefaultRetryTimes)
 }
 
 func (s *Session) checkIDExist() {
 	s.etcdCli.Txn(s.ctx).If(
 		clientv3.Compare(
-			clientv3.Version(path.Join(defaultServiceRoot, defaultIDKey)),
+			clientv3.Version(path.Join(DefaultServiceRoot, DefaultIDKey)),
 			"=",
 			0)).
-		Then(clientv3.OpPut(path.Join(defaultServiceRoot, defaultIDKey), "1")).Commit()
+		Then(clientv3.OpPut(path.Join(DefaultServiceRoot, DefaultIDKey), "1")).Commit()
 
 }
 
 func (s *Session) getServerIDWithKey(key string, retryTimes int) (int64, error) {
 	res := int64(0)
 	getServerIDWithKeyFn := func() error {
-		getResp, err := s.etcdCli.Get(s.ctx, path.Join(defaultServiceRoot, key))
+		getResp, err := s.etcdCli.Get(s.ctx, path.Join(DefaultServiceRoot, key))
 		if err != nil {
 			return nil
 		}
@@ -113,10 +113,10 @@ func (s *Session) getServerIDWithKey(key string, retryTimes int) (int64, error)
 		}
 		txnResp, err := s.etcdCli.Txn(s.ctx).If(
 			clientv3.Compare(
-				clientv3.Value(path.Join(defaultServiceRoot, defaultIDKey)),
+				clientv3.Value(path.Join(DefaultServiceRoot, DefaultIDKey)),
 				"=",
 				value)).
-			Then(clientv3.OpPut(path.Join(defaultServiceRoot, defaultIDKey), strconv.FormatInt(valueInt+1, 10))).Commit()
+			Then(clientv3.OpPut(path.Join(DefaultServiceRoot, DefaultIDKey), strconv.FormatInt(valueInt+1, 10))).Commit()
 		if err != nil {
 			return err
 		}
@@ -149,7 +149,7 @@ func (s *Session) getServerIDWithKey(key string, retryTimes int) (int64, error)
 func (s *Session) registerService() (<-chan *clientv3.LeaseKeepAliveResponse, error) {
 	var ch <-chan *clientv3.LeaseKeepAliveResponse
 	registerFn := func() error {
-		resp, err := s.etcdCli.Grant(s.ctx, defaultTTL)
+		resp, err := s.etcdCli.Grant(s.ctx, DefaultTTL)
 		if err != nil {
 			log.Error("register service", zap.Error(err))
 			return err
@@ -167,10 +167,10 @@ func (s *Session) registerService() (<-chan *clientv3.LeaseKeepAliveResponse, er
 		}
 		txnResp, err := s.etcdCli.Txn(s.ctx).If(
 			clientv3.Compare(
-				clientv3.Version(path.Join(defaultServiceRoot, key)),
+				clientv3.Version(path.Join(DefaultServiceRoot, key)),
 				"=",
 				0)).
-			Then(clientv3.OpPut(path.Join(defaultServiceRoot, key), string(sessionJSON), clientv3.WithLease(resp.ID))).Commit()
+			Then(clientv3.OpPut(path.Join(DefaultServiceRoot, key), string(sessionJSON), clientv3.WithLease(resp.ID))).Commit()
 
 		if err != nil {
 			fmt.Printf("compare and swap error %s\n. maybe the key has registered", err)
@@ -188,7 +188,7 @@ func (s *Session) registerService() (<-chan *clientv3.LeaseKeepAliveResponse, er
 		}
 		return nil
 	}
-	err := retry.Retry(defaultRetryTimes, time.Millisecond*200, registerFn)
+	err := retry.Retry(DefaultRetryTimes, time.Millisecond*200, registerFn)
 	if err != nil {
 		return ch, nil
 	}
@@ -221,7 +221,7 @@ func (s *Session) processKeepAliveResponse(ch <-chan *clientv3.LeaseKeepAliveRes
 // GetSessions will get all sessions registered in etcd.
 func (s *Session) GetSessions(prefix string) (map[string]*Session, error) {
 	res := make(map[string]*Session)
-	key := path.Join(defaultServiceRoot, prefix)
+	key := path.Join(DefaultServiceRoot, prefix)
 	resp, err := s.etcdCli.Get(s.ctx, key, clientv3.WithPrefix(),
 		clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
 	if err != nil {
@@ -245,7 +245,7 @@ func (s *Session) GetSessions(prefix string) (map[string]*Session, error) {
 func (s *Session) WatchServices(prefix string) (addChannel <-chan *Session, delChannel <-chan *Session) {
 	addCh := make(chan *Session, 10)
 	delCh := make(chan *Session, 10)
-	rch := s.etcdCli.Watch(s.ctx, path.Join(defaultServiceRoot, prefix), clientv3.WithPrefix(), clientv3.WithPrevKV())
+	rch := s.etcdCli.Watch(s.ctx, path.Join(DefaultServiceRoot, prefix), clientv3.WithPrefix(), clientv3.WithPrevKV())
 	go func() {
 		for {
 			select {
diff --git a/internal/util/sessionutil/session_util_test.go b/internal/util/sessionutil/session_util_test.go
index f30e51b1cd..5a897d6fb0 100644
--- a/internal/util/sessionutil/session_util_test.go
+++ b/internal/util/sessionutil/session_util_test.go
@@ -26,7 +26,7 @@ func TestGetServerIDConcurrently(t *testing.T) {
 	cli, err := clientv3.New(clientv3.Config{Endpoints: []string{etcdAddr}})
 	assert.Nil(t, err)
 	etcdKV := etcdkv.NewEtcdKV(cli, "")
-	_, err = cli.Delete(ctx, "/session", clientv3.WithPrefix())
+	_, err = cli.Delete(ctx, DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 
 	defer etcdKV.Close()
@@ -35,7 +35,7 @@ func TestGetServerIDConcurrently(t *testing.T) {
 	var wg sync.WaitGroup
 	var muList sync.Mutex = sync.Mutex{}
 
-	s := NewSession(ctx, []string{etcdAddr}, "test", "testAddr", false)
+	s := NewSession(ctx, []string{etcdAddr})
 	res := make([]int64, 0)
 
 	getIDFunc := func() {
@@ -71,15 +71,16 @@ func TestInit(t *testing.T) {
 	cli, err := clientv3.New(clientv3.Config{Endpoints: []string{etcdAddr}})
 	assert.Nil(t, err)
 	etcdKV := etcdkv.NewEtcdKV(cli, "")
-	_, err = cli.Delete(ctx, "/session", clientv3.WithPrefix())
+	_, err = cli.Delete(ctx, DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 
 	defer etcdKV.Close()
 	defer etcdKV.RemoveWithPrefix("")
 
-	s := NewSession(ctx, []string{etcdAddr}, "test", "testAddr", false)
-	assert.NotEqual(t, 0, s.leaseID)
-	assert.NotEqual(t, 0, s.ServerID)
+	s := NewSession(ctx, []string{etcdAddr})
+	s.Init("test", "testAddr", false)
+	assert.NotEqual(t, int64(0), s.leaseID)
+	assert.NotEqual(t, int64(0), s.ServerID)
 }
 
 func TestUpdateSessions(t *testing.T) {
@@ -94,7 +95,7 @@ func TestUpdateSessions(t *testing.T) {
 	cli, err := clientv3.New(clientv3.Config{Endpoints: []string{etcdAddr}})
 	assert.Nil(t, err)
 	etcdKV := etcdkv.NewEtcdKV(cli, "")
-	_, err = cli.Delete(ctx, "/session", clientv3.WithPrefix())
+	_, err = cli.Delete(ctx, DefaultServiceRoot, clientv3.WithPrefix())
 	assert.Nil(t, err)
 
 	defer etcdKV.Close()
@@ -103,7 +104,7 @@ func TestUpdateSessions(t *testing.T) {
 	var wg sync.WaitGroup
 	var muList sync.Mutex = sync.Mutex{}
 
-	s := NewSession(ctx, []string{etcdAddr}, "test", "testAddr", false)
+	s := NewSession(ctx, []string{etcdAddr})
 
 	sessions, err := s.GetSessions("test")
 	assert.Nil(t, err)
@@ -113,8 +114,8 @@ func TestUpdateSessions(t *testing.T) {
 	sList := []*Session{}
 
 	getIDFunc := func() {
-		singleS := NewSession(ctx, []string{etcdAddr}, "test", "testAddr", false)
-		singleS.Init()
+		singleS := NewSession(ctx, []string{etcdAddr})
+		singleS.Init("test", "testAddr", false)
 		muList.Lock()
 		sList = append(sList, singleS)
 		muList.Unlock()