diff --git a/unmaintained/repeated_vacuum/repeated_vacuum.go b/unmaintained/repeated_vacuum/repeated_vacuum.go
index 231694094..893f4a68a 100644
--- a/unmaintained/repeated_vacuum/repeated_vacuum.go
+++ b/unmaintained/repeated_vacuum/repeated_vacuum.go
@@ -7,6 +7,7 @@ import (
 	"log"
 	"math/rand"
 	"time"
+	"context"
 
 	"google.golang.org/grpc"
 
@@ -53,7 +54,7 @@ func main() {
 }
 
 func genFile(grpcDialOption grpc.DialOption, i int) (*operation.AssignResult, string) {
-	assignResult, err := operation.Assign(func() pb.ServerAddress { return pb.ServerAddress(*master) }, grpcDialOption, &operation.VolumeAssignRequest{
+	assignResult, err := operation.Assign(func(_ context.Context) pb.ServerAddress { return pb.ServerAddress(*master) }, grpcDialOption, &operation.VolumeAssignRequest{
 		Count:       1,
 		Replication: *replication,
 	})
diff --git a/unmaintained/volume_tailer/volume_tailer.go b/unmaintained/volume_tailer/volume_tailer.go
index 8a352dbb8..50ef1c74f 100644
--- a/unmaintained/volume_tailer/volume_tailer.go
+++ b/unmaintained/volume_tailer/volume_tailer.go
@@ -5,6 +5,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"log"
 	"time"
+	"context"
 
 	"github.com/seaweedfs/seaweedfs/weed/operation"
 	"github.com/seaweedfs/seaweedfs/weed/security"
@@ -38,7 +39,7 @@ func main() {
 		sinceTimeNs = time.Now().Add(-*rewindDuration).UnixNano()
 	}
 
-	err := operation.TailVolume(func() pb.ServerAddress { return pb.ServerAddress(*master) }, grpcDialOption, vid, uint64(sinceTimeNs), *timeoutSeconds, func(n *needle.Needle) (err error) {
+	err := operation.TailVolume(func(_ context.Context) pb.ServerAddress { return pb.ServerAddress(*master) }, grpcDialOption, vid, uint64(sinceTimeNs), *timeoutSeconds, func(n *needle.Needle) (err error) {
 		if n.Size == 0 {
 			println("-", n.String())
 			return nil
diff --git a/weed/command/backup.go b/weed/command/backup.go
index bbb6c6724..a8be4838e 100644
--- a/weed/command/backup.go
+++ b/weed/command/backup.go
@@ -1,6 +1,7 @@
 package command
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/seaweedfs/seaweedfs/weed/pb"
@@ -74,7 +75,7 @@ func runBackup(cmd *Command, args []string) bool {
 	vid := needle.VolumeId(*s.volumeId)
 
 	// find volume location, replication, ttl info
-	lookup, err := operation.LookupVolumeId(func() pb.ServerAddress { return pb.ServerAddress(*s.master) }, grpcDialOption, vid.String())
+	lookup, err := operation.LookupVolumeId(func(_ context.Context) pb.ServerAddress { return pb.ServerAddress(*s.master) }, grpcDialOption, vid.String())
 	if err != nil {
 		fmt.Printf("Error looking up volume %d: %v\n", vid, err)
 		return true
diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index 7f9a23cf8..2a0db47c2 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -2,6 +2,7 @@ package command
 
 import (
 	"bufio"
+	"context"
 	"fmt"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"io"
@@ -128,8 +129,9 @@ func runBenchmark(cmd *Command, args []string) bool {
 	}
 
 	b.masterClient = wdclient.NewMasterClient(b.grpcDialOption, "", "client", "", "", "", *pb.ServerAddresses(*b.masters).ToServiceDiscovery())
-	go b.masterClient.KeepConnectedToMaster()
-	b.masterClient.WaitUntilConnected()
+	ctx := context.Background()
+	go b.masterClient.KeepConnectedToMaster(ctx)
+	b.masterClient.WaitUntilConnected(ctx)
 
 	if *b.write {
 		benchWrite()
@@ -210,7 +212,7 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 				}
 				var jwtAuthorization security.EncodedJwt
 				if isSecure {
-					jwtAuthorization = operation.LookupJwt(b.masterClient.GetMaster(), b.grpcDialOption, df.fp.Fid)
+					jwtAuthorization = operation.LookupJwt(b.masterClient.GetMaster(context.Background()), b.grpcDialOption, df.fp.Fid)
 				}
 				if e := util.Delete(fmt.Sprintf("http://%s/%s", df.fp.Server, df.fp.Fid), string(jwtAuthorization)); e == nil {
 					s.completed++
diff --git a/weed/command/download.go b/weed/command/download.go
index de33643fc..060be9f14 100644
--- a/weed/command/download.go
+++ b/weed/command/download.go
@@ -1,6 +1,7 @@
 package command
 
 import (
+	"context"
 	"fmt"
 	"io"
 	"net/http"
@@ -50,7 +51,7 @@ func runDownload(cmd *Command, args []string) bool {
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 
 	for _, fid := range args {
-		if e := downloadToFile(func() pb.ServerAddress { return pb.ServerAddress(*d.server) }, grpcDialOption, fid, util.ResolvePath(*d.dir)); e != nil {
+		if e := downloadToFile(func(_ context.Context) pb.ServerAddress { return pb.ServerAddress(*d.server) }, grpcDialOption, fid, util.ResolvePath(*d.dir)); e != nil {
 			fmt.Println("Download Error: ", fid, e)
 		}
 	}
diff --git a/weed/command/filer_copy.go b/weed/command/filer_copy.go
index 83c5b167e..df5e002c5 100644
--- a/weed/command/filer_copy.go
+++ b/weed/command/filer_copy.go
@@ -472,7 +472,7 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 		for _, chunk := range chunks {
 			fileIds = append(fileIds, chunk.FileId)
 		}
-		operation.DeleteFiles(func() pb.ServerAddress {
+		operation.DeleteFiles(func(_ context.Context) pb.ServerAddress {
 			return pb.ServerAddress(copy.masters[0])
 		}, false, worker.options.grpcDialOption, fileIds)
 		return uploadError
diff --git a/weed/command/master.go b/weed/command/master.go
index 6a32b8abe..f80d8faeb 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -1,6 +1,7 @@
 package command
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"os"
@@ -218,7 +219,7 @@ func startMaster(masterOption MasterOptions, masterWhiteList []string) {
 		}()
 	}
 
-	go ms.MasterClient.KeepConnectedToMaster()
+	go ms.MasterClient.KeepConnectedToMaster(context.Background())
 
 	// start http server
 	var (
diff --git a/weed/command/master_follower.go b/weed/command/master_follower.go
index 64583c602..7217aff0b 100644
--- a/weed/command/master_follower.go
+++ b/weed/command/master_follower.go
@@ -140,7 +140,7 @@ func startMasterFollower(masterOptions MasterOptions) {
 	}
 	go grpcS.Serve(grpcL)
 
-	go ms.MasterClient.KeepConnectedToMaster()
+	go ms.MasterClient.KeepConnectedToMaster(context.Background())
 
 	// start http server
 	httpS := &http.Server{Handler: r}
diff --git a/weed/command/upload.go b/weed/command/upload.go
index 1f03f7b5a..3e6b8f9a2 100644
--- a/weed/command/upload.go
+++ b/weed/command/upload.go
@@ -97,7 +97,7 @@ func runUpload(cmd *Command, args []string) bool {
 					if e != nil {
 						return e
 					}
-					results, e := operation.SubmitFiles(func() pb.ServerAddress { return pb.ServerAddress(*upload.master) }, grpcDialOption, parts, *upload.replication, *upload.collection, *upload.dataCenter, *upload.ttl, *upload.diskType, *upload.maxMB, *upload.usePublicUrl)
+					results, e := operation.SubmitFiles(func(_ context.Context) pb.ServerAddress { return pb.ServerAddress(*upload.master) }, grpcDialOption, parts, *upload.replication, *upload.collection, *upload.dataCenter, *upload.ttl, *upload.diskType, *upload.maxMB, *upload.usePublicUrl)
 					bytes, _ := json.Marshal(results)
 					fmt.Println(string(bytes))
 					if e != nil {
@@ -119,7 +119,7 @@ func runUpload(cmd *Command, args []string) bool {
 			fmt.Println(e.Error())
 			return false
 		}
-		results, err := operation.SubmitFiles(func() pb.ServerAddress { return pb.ServerAddress(*upload.master) }, grpcDialOption, parts, *upload.replication, *upload.collection, *upload.dataCenter, *upload.ttl, *upload.diskType, *upload.maxMB, *upload.usePublicUrl)
+		results, err := operation.SubmitFiles(func(_ context.Context) pb.ServerAddress { return pb.ServerAddress(*upload.master) }, grpcDialOption, parts, *upload.replication, *upload.collection, *upload.dataCenter, *upload.ttl, *upload.diskType, *upload.maxMB, *upload.usePublicUrl)
 		if err != nil {
 			fmt.Println(err.Error())
 			return false
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index 9be8d5259..016bfc8fa 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -143,8 +143,8 @@ func (f *Filer) AggregateFromPeers(self pb.ServerAddress, existingNodes []*maste
 
 }
 
-func (f *Filer) ListExistingPeerUpdates() (existingNodes []*master_pb.ClusterNodeUpdate) {
-	return cluster.ListExistingPeerUpdates(f.GetMaster(), f.GrpcDialOption, f.MasterClient.FilerGroup, cluster.FilerType)
+func (f *Filer) ListExistingPeerUpdates(ctx context.Context) (existingNodes []*master_pb.ClusterNodeUpdate) {
+	return cluster.ListExistingPeerUpdates(f.GetMaster(ctx), f.GrpcDialOption, f.MasterClient.FilerGroup, cluster.FilerType)
 }
 
 func (f *Filer) SetStore(store FilerStore) (isFresh bool) {
@@ -177,12 +177,12 @@ func (f *Filer) GetStore() (store FilerStore) {
 	return f.Store
 }
 
-func (fs *Filer) GetMaster() pb.ServerAddress {
-	return fs.MasterClient.GetMaster()
+func (fs *Filer) GetMaster(ctx context.Context) pb.ServerAddress {
+	return fs.MasterClient.GetMaster(ctx)
 }
 
-func (fs *Filer) KeepMasterClientConnected() {
-	fs.MasterClient.KeepConnectedToMaster()
+func (fs *Filer) KeepMasterClientConnected(ctx context.Context) {
+	fs.MasterClient.KeepConnectedToMaster(ctx)
 }
 
 func (f *Filer) BeginTransaction(ctx context.Context) (context.Context, error) {
diff --git a/weed/mq/broker/broker_server.go b/weed/mq/broker/broker_server.go
index 9c321744b..9e62fe996 100644
--- a/weed/mq/broker/broker_server.go
+++ b/weed/mq/broker/broker_server.go
@@ -1,6 +1,7 @@
 package broker
 
 import (
+	"context"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/mq/pub_balancer"
 	"github.com/seaweedfs/seaweedfs/weed/mq/sub_coordinator"
@@ -68,9 +69,9 @@ func NewMessageBroker(option *MessageQueueBrokerOption, grpcDialOption grpc.Dial
 	pub_broker_balancer.OnAddBroker = mqBroker.Coordinator.OnSubAddBroker
 	pub_broker_balancer.OnRemoveBroker = mqBroker.Coordinator.OnSubRemoveBroker
 
-	go mqBroker.MasterClient.KeepConnectedToMaster()
+	go mqBroker.MasterClient.KeepConnectedToMaster(context.Background())
 
-	existingNodes := cluster.ListExistingPeerUpdates(mqBroker.MasterClient.GetMaster(), grpcDialOption, option.FilerGroup, cluster.FilerType)
+	existingNodes := cluster.ListExistingPeerUpdates(mqBroker.MasterClient.GetMaster(context.Background()), grpcDialOption, option.FilerGroup, cluster.FilerType)
 	for _, newNode := range existingNodes {
 		mqBroker.OnBrokerUpdate(newNode, time.Now())
 	}
diff --git a/weed/operation/assign_file_id.go b/weed/operation/assign_file_id.go
index 1b7a0146d..cc8e87b21 100644
--- a/weed/operation/assign_file_id.go
+++ b/weed/operation/assign_file_id.go
@@ -47,9 +47,9 @@ func NewAssignProxy(masterFn GetMasterFn, grpcDialOption grpc.DialOption, concur
 	ap = &AssignProxy{
 		pool: make(chan *singleThreadAssignProxy, concurrency),
 	}
-	ap.grpcConnection, err = pb.GrpcDial(context.Background(), masterFn().ToGrpcAddress(), true, grpcDialOption)
+	ap.grpcConnection, err = pb.GrpcDial(context.Background(), masterFn(context.Background()).ToGrpcAddress(), true, grpcDialOption)
 	if err != nil {
-		return nil, fmt.Errorf("fail to dial %s: %v", masterFn().ToGrpcAddress(), err)
+		return nil, fmt.Errorf("fail to dial %s: %v", masterFn(context.Background()).ToGrpcAddress(), err)
 	}
 	for i := 0; i < concurrency; i++ {
 		ap.pool <- &singleThreadAssignProxy{}
@@ -153,7 +153,7 @@ func Assign(masterFn GetMasterFn, grpcDialOption grpc.DialOption, primaryRequest
 			continue
 		}
 
-		lastError = WithMasterServerClient(false, masterFn(), grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
+		lastError = WithMasterServerClient(false, masterFn(context.Background()), grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
 			req := &master_pb.AssignRequest{
 				Count:               request.Count,
 				Replication:         request.Replication,
diff --git a/weed/operation/assign_file_id_test.go b/weed/operation/assign_file_id_test.go
index f6362dceb..ac0f4eee6 100644
--- a/weed/operation/assign_file_id_test.go
+++ b/weed/operation/assign_file_id_test.go
@@ -1,6 +1,7 @@
 package operation
 
 import (
+	"context"
 	"fmt"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"google.golang.org/grpc"
@@ -11,7 +12,7 @@ import (
 func BenchmarkWithConcurrency(b *testing.B) {
 	concurrencyLevels := []int{1, 10, 100, 1000}
 
-	ap, _ := NewAssignProxy(func() pb.ServerAddress {
+	ap, _ := NewAssignProxy(func(_ context.Context) pb.ServerAddress {
 		return pb.ServerAddress("localhost:9333")
 	}, grpc.WithInsecure(), 16)
 
@@ -47,7 +48,7 @@ func BenchmarkWithConcurrency(b *testing.B) {
 }
 
 func BenchmarkStreamAssign(b *testing.B) {
-	ap, _ := NewAssignProxy(func() pb.ServerAddress {
+	ap, _ := NewAssignProxy(func(_ context.Context) pb.ServerAddress {
 		return pb.ServerAddress("localhost:9333")
 	}, grpc.WithInsecure(), 16)
 	for i := 0; i < b.N; i++ {
@@ -59,7 +60,7 @@ func BenchmarkStreamAssign(b *testing.B) {
 
 func BenchmarkUnaryAssign(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		Assign(func() pb.ServerAddress {
+		Assign(func(_ context.Context) pb.ServerAddress {
 			return pb.ServerAddress("localhost:9333")
 		}, grpc.WithInsecure(), &VolumeAssignRequest{
 			Count: 1,
diff --git a/weed/operation/chunked_file.go b/weed/operation/chunked_file.go
index eacf64112..c451420fe 100644
--- a/weed/operation/chunked_file.go
+++ b/weed/operation/chunked_file.go
@@ -1,6 +1,7 @@
 package operation
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -173,7 +174,7 @@ func (cf *ChunkedFileReader) WriteTo(w io.Writer) (n int64, err error) {
 	for ; chunkIndex < len(cf.chunkList); chunkIndex++ {
 		ci := cf.chunkList[chunkIndex]
 		// if we need read date from local volume server first?
-		fileUrl, jwt, lookupError := LookupFileId(func() pb.ServerAddress {
+		fileUrl, jwt, lookupError := LookupFileId(func(_ context.Context) pb.ServerAddress {
 			return cf.master
 		}, cf.grpcDialOption, ci.Fid)
 		if lookupError != nil {
diff --git a/weed/operation/lookup.go b/weed/operation/lookup.go
index fc4609a2d..6c89c17b1 100644
--- a/weed/operation/lookup.go
+++ b/weed/operation/lookup.go
@@ -80,7 +80,7 @@ func LookupVolumeIds(masterFn GetMasterFn, grpcDialOption grpc.DialOption, vids
 
 	//only query unknown_vids
 
-	err := WithMasterServerClient(false, masterFn(), grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
+	err := WithMasterServerClient(false, masterFn(context.Background()), grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
 
 		req := &master_pb.LookupVolumeRequest{
 			VolumeOrFileIds: unknown_vids,
diff --git a/weed/operation/submit.go b/weed/operation/submit.go
index 3eb38c31e..57bd81b14 100644
--- a/weed/operation/submit.go
+++ b/weed/operation/submit.go
@@ -1,6 +1,7 @@
 package operation
 
 import (
+	"context"
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"io"
 	"mime"
@@ -40,7 +41,7 @@ type SubmitResult struct {
 	Error    string `json:"error,omitempty"`
 }
 
-type GetMasterFn func() pb.ServerAddress
+type GetMasterFn func(ctx context.Context) pb.ServerAddress
 
 func SubmitFiles(masterFn GetMasterFn, grpcDialOption grpc.DialOption, files []FilePart, replication string, collection string, dataCenter string, ttl string, diskType string, maxMB int, usePublicUrl bool) ([]SubmitResult, error) {
 	results := make([]SubmitResult, len(files))
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 795cd3ccc..0b7254c0d 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -160,7 +160,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	fs.checkWithMaster()
 
 	go stats.LoopPushingMetric("filer", string(fs.option.Host), fs.metricsAddress, fs.metricsIntervalSec)
-	go fs.filer.KeepMasterClientConnected()
+	go fs.filer.KeepMasterClientConnected(context.Background())
 
 	if !util.LoadConfiguration("filer", false) {
 		v.SetDefault("leveldb2.enabled", true)
@@ -196,7 +196,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 		readonlyMux.HandleFunc("/", fs.readonlyFilerHandler)
 	}
 
-	existingNodes := fs.filer.ListExistingPeerUpdates()
+	existingNodes := fs.filer.ListExistingPeerUpdates(context.Background())
 	startFromTime := time.Now().Add(-filer.LogFlushInterval)
 	if option.JoinExistingFiler {
 		startFromTime = time.Time{}
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 580cdfed2..3499a2e13 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -292,12 +292,12 @@ func (ms *MasterServer) startAdminScripts() {
 
 	reg, _ := regexp.Compile(`'.*?'|".*?"|\S+`)
 
-	go commandEnv.MasterClient.KeepConnectedToMaster()
+	go commandEnv.MasterClient.KeepConnectedToMaster(context.Background())
 
 	go func() {
 		for {
 			time.Sleep(time.Duration(sleepMinutes) * time.Minute)
-			if ms.Topo.IsLeader() && ms.MasterClient.GetMaster() != "" {
+			if ms.Topo.IsLeader() && ms.MasterClient.GetMaster(context.Background()) != "" {
 				shellOptions.FilerAddress = ms.GetOneFiler(cluster.FilerGroupName(*shellOptions.FilerGroup))
 				if shellOptions.FilerAddress == "" {
 					continue
diff --git a/weed/server/master_server_handlers_admin.go b/weed/server/master_server_handlers_admin.go
index 0d7131340..f40b819af 100644
--- a/weed/server/master_server_handlers_admin.go
+++ b/weed/server/master_server_handlers_admin.go
@@ -124,13 +124,13 @@ func (ms *MasterServer) redirectHandler(w http.ResponseWriter, r *http.Request)
 
 func (ms *MasterServer) submitFromMasterServerHandler(w http.ResponseWriter, r *http.Request) {
 	if ms.Topo.IsLeader() {
-		submitForClientHandler(w, r, func() pb.ServerAddress { return ms.option.Master }, ms.grpcDialOption)
+		submitForClientHandler(w, r, func(ctx context.Context) pb.ServerAddress { return ms.option.Master }, ms.grpcDialOption)
 	} else {
 		masterUrl, err := ms.Topo.Leader()
 		if err != nil {
 			writeJsonError(w, r, http.StatusInternalServerError, err)
 		} else {
-			submitForClientHandler(w, r, func() pb.ServerAddress { return masterUrl }, ms.grpcDialOption)
+			submitForClientHandler(w, r, func(ctx context.Context) pb.ServerAddress { return masterUrl }, ms.grpcDialOption)
 		}
 	}
 }
diff --git a/weed/server/volume_grpc_admin.go b/weed/server/volume_grpc_admin.go
index abd39b582..00a285406 100644
--- a/weed/server/volume_grpc_admin.go
+++ b/weed/server/volume_grpc_admin.go
@@ -181,7 +181,7 @@ func (vs *VolumeServer) VolumeMarkReadonly(ctx context.Context, req *volume_serv
 }
 
 func (vs *VolumeServer) notifyMasterVolumeReadonly(v *storage.Volume, isReadOnly bool) error {
-	if grpcErr := pb.WithMasterClient(false, vs.GetMaster(), vs.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
+	if grpcErr := pb.WithMasterClient(false, vs.GetMaster(context.Background()), vs.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
 		_, err := client.VolumeMarkReadonly(context.Background(), &master_pb.VolumeMarkReadonlyRequest{
 			Ip:               vs.store.Ip,
 			Port:             uint32(vs.store.Port),
@@ -197,8 +197,8 @@ func (vs *VolumeServer) notifyMasterVolumeReadonly(v *storage.Volume, isReadOnly
 		}
 		return nil
 	}); grpcErr != nil {
-		glog.V(0).Infof("connect to %s: %v", vs.GetMaster(), grpcErr)
-		return fmt.Errorf("grpc VolumeMarkReadonly with master %s: %v", vs.GetMaster(), grpcErr)
+		glog.V(0).Infof("connect to %s: %v", vs.GetMaster(context.Background()), grpcErr)
+		return fmt.Errorf("grpc VolumeMarkReadonly with master %s: %v", vs.GetMaster(context.Background()), grpcErr)
 	}
 	return nil
 }
diff --git a/weed/server/volume_grpc_client_to_master.go b/weed/server/volume_grpc_client_to_master.go
index d2aa61a17..81bb87613 100644
--- a/weed/server/volume_grpc_client_to_master.go
+++ b/weed/server/volume_grpc_client_to_master.go
@@ -21,7 +21,7 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
-func (vs *VolumeServer) GetMaster() pb.ServerAddress {
+func (vs *VolumeServer) GetMaster(ctx context.Context) pb.ServerAddress {
 	return vs.currentMaster
 }
 
diff --git a/weed/server/volume_grpc_copy.go b/weed/server/volume_grpc_copy.go
index 51b61b225..6548b7c56 100644
--- a/weed/server/volume_grpc_copy.go
+++ b/weed/server/volume_grpc_copy.go
@@ -84,17 +84,17 @@ func (vs *VolumeServer) VolumeCopy(req *volume_server_pb.VolumeCopyRequest, stre
 		}()
 
 		var preallocateSize int64
-		if grpcErr := pb.WithMasterClient(false, vs.GetMaster(), vs.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
+		if grpcErr := pb.WithMasterClient(false, vs.GetMaster(context.Background()), vs.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
 			resp, err := client.GetMasterConfiguration(context.Background(), &master_pb.GetMasterConfigurationRequest{})
 			if err != nil {
-				return fmt.Errorf("get master %s configuration: %v", vs.GetMaster(), err)
+				return fmt.Errorf("get master %s configuration: %v", vs.GetMaster(context.Background()), err)
 			}
 			if resp.VolumePreallocate {
 				preallocateSize = int64(resp.VolumeSizeLimitMB) * (1 << 20)
 			}
 			return nil
 		}); grpcErr != nil {
-			glog.V(0).Infof("connect to %s: %v", vs.GetMaster(), grpcErr)
+			glog.V(0).Infof("connect to %s: %v", vs.GetMaster(context.Background()), grpcErr)
 		}
 
 		if preallocateSize > 0 && !hasRemoteDatFile {
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index 08e536811..cc364513b 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -291,7 +292,7 @@ func (vs *VolumeServer) tryHandleChunkedFile(n *needle.Needle, fileName string,
 
 	w.Header().Set("X-File-Store", "chunked")
 
-	chunkedFileReader := operation.NewChunkedFileReader(chunkManifest.Chunks, vs.GetMaster(), vs.grpcDialOption)
+	chunkedFileReader := operation.NewChunkedFileReader(chunkManifest.Chunks, vs.GetMaster(context.Background()), vs.grpcDialOption)
 	defer chunkedFileReader.Close()
 
 	rs := conditionallyCropImages(chunkedFileReader, ext, r)
diff --git a/weed/shell/command_cluster_check.go b/weed/shell/command_cluster_check.go
index 03acca5b2..5c9866d29 100644
--- a/weed/shell/command_cluster_check.go
+++ b/weed/shell/command_cluster_check.go
@@ -103,7 +103,7 @@ func (c *commandClusterCheck) Do(args []string, commandEnv *CommandEnv, writer i
 
 	// collect all masters
 	var masters []pb.ServerAddress
-	masters = append(masters, commandEnv.MasterClient.GetMasters()...)
+	masters = append(masters, commandEnv.MasterClient.GetMasters(context.Background())...)
 
 	// check from master to volume servers
 	for _, master := range masters {
diff --git a/weed/shell/shell_liner.go b/weed/shell/shell_liner.go
index 20add302a..407dce006 100644
--- a/weed/shell/shell_liner.go
+++ b/weed/shell/shell_liner.go
@@ -46,8 +46,9 @@ func RunShell(options ShellOptions) {
 
 	commandEnv := NewCommandEnv(&options)
 
-	go commandEnv.MasterClient.KeepConnectedToMaster()
-	commandEnv.MasterClient.WaitUntilConnected()
+	ctx := context.Background()
+	go commandEnv.MasterClient.KeepConnectedToMaster(ctx)
+	commandEnv.MasterClient.WaitUntilConnected(ctx)
 
 	if commandEnv.option.FilerAddress == "" {
 		var filers []pb.ServerAddress
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index 98442c1af..da46a440b 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -61,7 +61,7 @@ func (mc *MasterClient) LookupFileIdWithFallback(fileId string) (fullUrls []stri
 	if err == nil && len(fullUrls) > 0 {
 		return
 	}
-	err = pb.WithMasterClient(false, mc.GetMaster(), mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
+	err = pb.WithMasterClient(false, mc.GetMaster(context.Background()), mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
 		resp, err := client.LookupVolume(context.Background(), &master_pb.LookupVolumeRequest{
 			VolumeOrFileIds: []string{fileId},
 		})
@@ -103,31 +103,43 @@ func (mc *MasterClient) setCurrentMaster(master pb.ServerAddress) {
 	mc.currentMasterLock.Unlock()
 }
 
-func (mc *MasterClient) GetMaster() pb.ServerAddress {
-	mc.WaitUntilConnected()
+func (mc *MasterClient) GetMaster(ctx context.Context) pb.ServerAddress {
+	mc.WaitUntilConnected(ctx)
 	return mc.getCurrentMaster()
 }
 
-func (mc *MasterClient) GetMasters() []pb.ServerAddress {
-	mc.WaitUntilConnected()
+func (mc *MasterClient) GetMasters(ctx context.Context) []pb.ServerAddress {
+	mc.WaitUntilConnected(ctx)
 	return mc.masters.GetInstances()
 }
 
-func (mc *MasterClient) WaitUntilConnected() {
+func (mc *MasterClient) WaitUntilConnected(ctx context.Context) {
 	for {
-		if mc.getCurrentMaster() != "" {
+		select {
+		case <-ctx.Done():
+			glog.V(0).Infof("Connection wait stopped: %v", ctx.Err())
 			return
+		default:
+			if mc.getCurrentMaster() != "" {
+				return
+			}
+			time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
+			print(".")
 		}
-		time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond)
-		print(".")
 	}
 }
 
-func (mc *MasterClient) KeepConnectedToMaster() {
+func (mc *MasterClient) KeepConnectedToMaster(ctx context.Context) {
 	glog.V(1).Infof("%s.%s masterClient bootstraps with masters %v", mc.FilerGroup, mc.clientType, mc.masters)
 	for {
-		mc.tryAllMasters()
-		time.Sleep(time.Second)
+		select {
+		case <-ctx.Done():
+			glog.V(0).Infof("Connection to masters stopped: %v", ctx.Err())
+			return
+		default:
+			mc.tryAllMasters(ctx)
+			time.Sleep(time.Second)
+		}
 	}
 }
 
@@ -157,23 +169,29 @@ func (mc *MasterClient) FindLeaderFromOtherPeers(myMasterAddress pb.ServerAddres
 	return
 }
 
-func (mc *MasterClient) tryAllMasters() {
+func (mc *MasterClient) tryAllMasters(ctx context.Context) {
 	var nextHintedLeader pb.ServerAddress
 	mc.masters.RefreshBySrvIfAvailable()
 	for _, master := range mc.masters.GetInstances() {
-		nextHintedLeader = mc.tryConnectToMaster(master)
+		nextHintedLeader = mc.tryConnectToMaster(ctx, master)
 		for nextHintedLeader != "" {
-			nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader)
+			select {
+			case <-ctx.Done():
+				glog.V(0).Infof("Connection attempt to all masters stopped: %v", ctx.Err())
+				return
+			default:
+				nextHintedLeader = mc.tryConnectToMaster(ctx, nextHintedLeader)
+			}
 		}
 		mc.setCurrentMaster("")
 	}
 }
 
-func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedLeader pb.ServerAddress) {
+func (mc *MasterClient) tryConnectToMaster(ctx context.Context, master pb.ServerAddress) (nextHintedLeader pb.ServerAddress) {
 	glog.V(1).Infof("%s.%s masterClient Connecting to master %v", mc.FilerGroup, mc.clientType, master)
 	stats.MasterClientConnectCounter.WithLabelValues("total").Inc()
 	gprcErr := pb.WithMasterClient(true, master, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
-		ctx, cancel := context.WithCancel(context.Background())
+		ctx, cancel := context.WithCancel(ctx)
 		defer cancel()
 
 		stream, err := client.KeepConnected(ctx)
@@ -229,8 +247,8 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 
 			if resp.VolumeLocation != nil {
 				// maybe the leader is changed
-				if resp.VolumeLocation.Leader != "" && string(mc.GetMaster()) != resp.VolumeLocation.Leader {
-					glog.V(0).Infof("currentMaster %v redirected to leader %v", mc.GetMaster(), resp.VolumeLocation.Leader)
+				if resp.VolumeLocation.Leader != "" && string(mc.GetMaster(ctx)) != resp.VolumeLocation.Leader {
+					glog.V(0).Infof("currentMaster %v redirected to leader %v", mc.GetMaster(ctx), resp.VolumeLocation.Leader)
 					nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader)
 					stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToLeader).Inc()
 					return nil
@@ -254,6 +272,10 @@ func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedL
 				}
 				mc.OnPeerUpdateLock.RUnlock()
 			}
+			if err := ctx.Err(); err != nil {
+				glog.V(0).Infof("Connection attempt to master stopped: %v", err)
+				return err
+			}
 		}
 	})
 	if gprcErr != nil {
@@ -298,8 +320,13 @@ func (mc *MasterClient) updateVidMap(resp *master_pb.KeepConnectedResponse) {
 }
 
 func (mc *MasterClient) WithClient(streamingMode bool, fn func(client master_pb.SeaweedClient) error) error {
+	getMasterF := func() pb.ServerAddress { return mc.GetMaster(context.Background()) }
+	return mc.WithClientCustomGetMaster(getMasterF, streamingMode, fn)
+}
+
+func (mc *MasterClient) WithClientCustomGetMaster(getMasterF func() pb.ServerAddress, streamingMode bool, fn func(client master_pb.SeaweedClient) error) error {
 	return util.Retry("master grpc", func() error {
-		return pb.WithMasterClient(streamingMode, mc.GetMaster(), mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
+		return pb.WithMasterClient(streamingMode, getMasterF(), mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error {
 			return fn(client)
 		})
 	})