diff --git a/weed/Makefile b/weed/Makefile
index ad1f0b6f9..205104969 100644
--- a/weed/Makefile
+++ b/weed/Makefile
@@ -41,3 +41,8 @@ debug_filer_copy:
 debug_filer_remote_sync:
 	go build -gcflags="all=-N -l"
 	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 filer.remote.sync -filer="localhost:8888" -dir=/buckets/b2 -timeAgo=10000h
+
+debug_master_follower:
+	go build -gcflags="all=-N -l"
+	dlv --listen=:2345 --headless=true --api-version=2 --accept-multiclient exec weed -- -v=4 master.follower
+
diff --git a/weed/command/command.go b/weed/command/command.go
index 02de2bd35..a3fdcfc6f 100644
--- a/weed/command/command.go
+++ b/weed/command/command.go
@@ -28,6 +28,7 @@ var Commands = []*Command{
 	cmdFuse,
 	cmdGateway,
 	cmdMaster,
+	cmdMasterFollower,
 	cmdMount,
 	cmdS3,
 	cmdIam,
diff --git a/weed/command/master_follower.go b/weed/command/master_follower.go
new file mode 100644
index 000000000..949743b3e
--- /dev/null
+++ b/weed/command/master_follower.go
@@ -0,0 +1,145 @@
+package command
+
+import (
+	"context"
+	"fmt"
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/chrislusf/seaweedfs/weed/util"
+	"github.com/gorilla/mux"
+	"google.golang.org/grpc/reflection"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	mf MasterOptions
+)
+
+func init() {
+	cmdMasterFollower.Run = runMasterFollower // break init cycle
+	mf.port = cmdMasterFollower.Flag.Int("port", 9334, "http listen port")
+	mf.ipBind = cmdMasterFollower.Flag.String("ip.bind", "", "ip address to bind to")
+	mf.peers = cmdMasterFollower.Flag.String("masters", "localhost:9333", "all master nodes in comma separated ip:port list, example: 127.0.0.1:9093,127.0.0.1:9094,127.0.0.1:9095")
+
+	mf.ip = aws.String(util.DetectedHostAddress())
+	mf.metaFolder = aws.String("")
+	mf.volumeSizeLimitMB = nil
+	mf.volumePreallocate = nil
+	mf.defaultReplication = nil
+	mf.garbageThreshold = aws.Float64(0.1)
+	mf.whiteList = nil
+	mf.disableHttp = aws.Bool(false)
+	mf.metricsAddress = aws.String("")
+	mf.metricsIntervalSec = aws.Int(0)
+	mf.raftResumeState = aws.Bool(false)
+}
+
+var cmdMasterFollower = &Command{
+	UsageLine: "master.follower -port=9333 -masters=<master1Host>:<master1Port>",
+	Short:     "start a master follower",
+	Long: `start a master follower to provide volume=>location mapping service
+
+	The master follower does not participate in master election. 
+	It just follow the existing masters, and listen for any volume location changes.
+
+	In most cases, the master follower is not needed. In big data centers with thousands of volume
+	servers. In theory, the master may have trouble to keep up with the write requests and read requests.
+
+	The master follower can relieve the master from from read requests, which only needs to 
+	lookup a fileId or volumeId.
+
+	The master follower currently can handle fileId lookup requests:
+		/dir/lookup?volumeId=4
+		/dir/lookup?fileId=4,49c50924569199
+	And gRPC API
+		rpc LookupVolume (LookupVolumeRequest) returns (LookupVolumeResponse) {}
+
+	This master follower is stateless and can run from any place.
+
+  `,
+}
+
+func runMasterFollower(cmd *Command, args []string) bool {
+
+	util.LoadConfiguration("security", false)
+	util.LoadConfiguration("master", false)
+
+	startMasterFollower(mf)
+
+	return true
+}
+
+func startMasterFollower(masterOptions MasterOptions) {
+
+	// collect settings from main masters
+	masters := strings.Split(*mf.peers, ",")
+	masterGrpcAddresses, err := pb.ParseServersToGrpcAddresses(masters)
+	if err != nil {
+		glog.V(0).Infof("ParseFilerGrpcAddress: %v", err)
+		return
+	}
+
+	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.master")
+	for i := 0; i < 10; i++ {
+		err = pb.WithOneOfGrpcMasterClients(masterGrpcAddresses, grpcDialOption, func(client master_pb.SeaweedClient) error {
+			resp, err := client.GetMasterConfiguration(context.Background(), &master_pb.GetMasterConfigurationRequest{})
+			if err != nil {
+				return fmt.Errorf("get master grpc address %v configuration: %v", masterGrpcAddresses, err)
+			}
+			masterOptions.defaultReplication = &resp.DefaultReplication
+			masterOptions.volumeSizeLimitMB = aws.Uint(uint(resp.VolumeSizeLimitMB))
+			masterOptions.volumePreallocate = &resp.VolumePreallocate
+			return nil
+		})
+		if err != nil {
+			glog.V(0).Infof("failed to talk to filer %v: %v", masterGrpcAddresses, err)
+			glog.V(0).Infof("wait for %d seconds ...", i+1)
+			time.Sleep(time.Duration(i+1) * time.Second)
+		}
+	}
+	if err != nil {
+		glog.Errorf("failed to talk to filer %v: %v", masterGrpcAddresses, err)
+		return
+	}
+
+
+	option := masterOptions.toMasterOption(nil)
+	option.IsFollower = true
+
+
+	r := mux.NewRouter()
+	ms := weed_server.NewMasterServer(r, option, masters)
+	listeningAddress := *masterOptions.ipBind + ":" + strconv.Itoa(*masterOptions.port)
+	glog.V(0).Infof("Start Seaweed Master %s at %s", util.Version(), listeningAddress)
+	masterListener, e := util.NewListener(listeningAddress, 0)
+	if e != nil {
+		glog.Fatalf("Master startup error: %v", e)
+	}
+
+	// starting grpc server
+	grpcPort := *masterOptions.port + 10000
+	grpcL, err := util.NewListener(*masterOptions.ipBind+":"+strconv.Itoa(grpcPort), 0)
+	if err != nil {
+		glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err)
+	}
+	grpcS := pb.NewGrpcServer(security.LoadServerTLS(util.GetViper(), "grpc.master"))
+	master_pb.RegisterSeaweedServer(grpcS, ms)
+	reflection.Register(grpcS)
+	glog.V(0).Infof("Start Seaweed Master %s grpc server at %s:%d", util.Version(), *masterOptions.ip, grpcPort)
+	go grpcS.Serve(grpcL)
+
+	go ms.MasterClient.KeepConnectedToMaster()
+
+	// start http server
+	httpS := &http.Server{Handler: r}
+	go httpS.Serve(masterListener)
+
+	select {}
+}
diff --git a/weed/pb/grpc_client_server.go b/weed/pb/grpc_client_server.go
index fac8adcb3..15dc917e9 100644
--- a/weed/pb/grpc_client_server.go
+++ b/weed/pb/grpc_client_server.go
@@ -213,6 +213,21 @@ func WithMasterClient(master string, grpcDialOption grpc.DialOption, fn func(cli
 
 }
 
+func WithOneOfGrpcMasterClients(masterGrpcAddresses []string, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) (err error) {
+
+	for _, masterGrpcAddress := range masterGrpcAddresses {
+		err = WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
+			client := master_pb.NewSeaweedClient(grpcConnection)
+			return fn(client)
+		}, masterGrpcAddress, grpcDialOption)
+		if err == nil {
+			return nil
+		}
+	}
+
+	return err
+}
+
 func WithBrokerGrpcClient(brokerGrpcAddress string, grpcDialOption grpc.DialOption, fn func(client messaging_pb.SeaweedMessagingClient) error) error {
 
 	return WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 6ef27fb4d..ce8a6dc12 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -275,6 +275,8 @@ message GetMasterConfigurationResponse {
     repeated StorageBackend storage_backends = 3;
     string default_replication = 4;
     string leader = 5;
+    uint32 volume_size_limit_m_b = 6;
+    bool volume_preallocate = 7;
 }
 
 message ListMasterClientsRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 75e165ed6..46dad9325 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -2297,6 +2297,8 @@ type GetMasterConfigurationResponse struct {
 	StorageBackends        []*StorageBackend `protobuf:"bytes,3,rep,name=storage_backends,json=storageBackends,proto3" json:"storage_backends,omitempty"`
 	DefaultReplication     string            `protobuf:"bytes,4,opt,name=default_replication,json=defaultReplication,proto3" json:"default_replication,omitempty"`
 	Leader                 string            `protobuf:"bytes,5,opt,name=leader,proto3" json:"leader,omitempty"`
+	VolumeSizeLimitMB      uint32            `protobuf:"varint,6,opt,name=volume_size_limit_m_b,json=volumeSizeLimitMB,proto3" json:"volume_size_limit_m_b,omitempty"`
+	VolumePreallocate      bool              `protobuf:"varint,7,opt,name=volume_preallocate,json=volumePreallocate,proto3" json:"volume_preallocate,omitempty"`
 }
 
 func (x *GetMasterConfigurationResponse) Reset() {
@@ -2366,6 +2368,20 @@ func (x *GetMasterConfigurationResponse) GetLeader() string {
 	return ""
 }
 
+func (x *GetMasterConfigurationResponse) GetVolumeSizeLimitMB() uint32 {
+	if x != nil {
+		return x.VolumeSizeLimitMB
+	}
+	return 0
+}
+
+func (x *GetMasterConfigurationResponse) GetVolumePreallocate() bool {
+	if x != nil {
+		return x.VolumePreallocate
+	}
+	return false
+}
+
 type ListMasterClientsRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3251,7 +3267,7 @@ var file_master_proto_rawDesc = []byte{
 	0x16, 0x0a, 0x14, 0x56, 0x61, 0x63, 0x75, 0x75, 0x6d, 0x56, 0x6f, 0x6c, 0x75, 0x6d, 0x65, 0x52,
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 	0x4d, 0x61, 0x73, 0x74, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x75, 0x72, 0x61, 0x74,
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@@ -3268,16 +3284,38 @@ var file_master_proto_rawDesc = []byte{
 	0x72, 0x65, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x04, 0x20, 0x01, 0x28,
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@@ -3285,105 +3323,90 @@ var file_master_proto_rawDesc = []byte{
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+	0x33,
 }
 
 var (
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 4132ce690..314db363f 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -68,10 +68,6 @@ func (ms *MasterServer) ProcessGrowRequest() {
 
 func (ms *MasterServer) LookupVolume(ctx context.Context, req *master_pb.LookupVolumeRequest) (*master_pb.LookupVolumeResponse, error) {
 
-	if !ms.Topo.IsLeader() {
-		return nil, raft.NotLeaderError
-	}
-
 	resp := &master_pb.LookupVolumeResponse{}
 	volumeLocations := ms.lookupVolumeId(req.VolumeIds, req.Collection)
 
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 273d6ba7d..d2edeb6cb 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -44,6 +44,7 @@ type MasterOption struct {
 	DisableHttp             bool
 	MetricsAddress          string
 	MetricsIntervalSec      int
+	IsFollower              bool
 }
 
 type MasterServer struct {
@@ -145,7 +146,9 @@ func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *Maste
 
 	ms.ProcessGrowRequest()
 
-	ms.startAdminScripts()
+	if !option.IsFollower {
+		ms.startAdminScripts()
+	}
 
 	return ms
 }
@@ -193,8 +196,8 @@ func (ms *MasterServer) proxyToLeader(f http.HandlerFunc) http.HandlerFunc {
 			proxy.Transport = util.Transport
 			proxy.ServeHTTP(w, r)
 		} else {
-			// drop it to the floor
-			// writeJsonError(w, r, errors.New(ms.Topo.RaftServer.Name()+" does not know Leader yet:"+ms.Topo.RaftServer.Leader()))
+			// handle requests locally
+			f(w, r)
 		}
 	}
 }