add fs.FSStatfser for SeaweedFS weed mount

10 files changed, 584 insertions, 139 deletions

diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index ff482edb5..e1f369e5b 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -43,6 +43,12 @@ type WFS struct {
 	// cache grpc connections
 	grpcClients     map[string]*grpc.ClientConn
 	grpcClientsLock sync.Mutex
+
+	stats statsCache
+}
+type statsCache struct {
+	filer_pb.StatisticsResponse
+	lastChecked int64 // unix time in seconds
 }
 
 func NewSeaweedFileSystem(option *Option) *WFS {
@@ -139,9 +145,40 @@ func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.
 
 	glog.V(4).Infof("reading fs stats: %+v", req)
 
-	totalDiskSize := uint64(0)
-	usedDiskSize := uint64(0)
-	actualFileCount := uint64(0)
+	if wfs.stats.lastChecked < time.Now().Unix()-20 {
+
+		err := wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+			request := &filer_pb.StatisticsRequest{
+				Collection:  wfs.option.Collection,
+				Replication: wfs.option.Replication,
+				Ttl:         fmt.Sprintf("%ds", wfs.option.TtlSec),
+			}
+
+			glog.V(4).Infof("reading filer stats: %+v", request)
+			resp, err := client.Statistics(ctx, request)
+			if err != nil {
+				glog.V(0).Infof("reading filer stats %v: %v", request, err)
+				return err
+			}
+			glog.V(4).Infof("read filer stats: %+v", resp)
+
+			wfs.stats.TotalSize = resp.TotalSize
+			wfs.stats.UsedSize = resp.UsedSize
+			wfs.stats.FileCount = resp.FileCount
+			wfs.stats.lastChecked = time.Now().Unix()
+
+			return nil
+		})
+		if err != nil {
+			glog.V(0).Infof("filer Statistics: %v", err)
+			return err
+		}
+	}
+
+	totalDiskSize := wfs.stats.TotalSize
+	usedDiskSize := wfs.stats.UsedSize
+	actualFileCount := wfs.stats.FileCount
 
 	// Compute the total number of available blocks
 	resp.Blocks = totalDiskSize / blockSize
diff --git a/weed/operation/stats.go b/weed/operation/stats.go
new file mode 100644
index 000000000..277b0e835
--- /dev/null
+++ b/weed/operation/stats.go
@@ -0,0 +1,24 @@
+package operation
+
+import (
+	"context"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
+
+func Statistics(server string, req *master_pb.StatisticsRequest) (resp *master_pb.StatisticsResponse, err error) {
+
+	err = withMasterServerClient(server, func(masterClient master_pb.SeaweedClient) error {
+		grpcResponse, grpcErr := masterClient.Statistics(context.Background(), req)
+		if grpcErr != nil {
+			return grpcErr
+		}
+
+		resp = grpcResponse
+
+		return nil
+
+	})
+
+	return
+}
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 3f7c39c89..a19aa7dbc 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -30,6 +30,9 @@ service SeaweedFiler {
     rpc DeleteCollection (DeleteCollectionRequest) returns (DeleteCollectionResponse) {
     }
 
+    rpc Statistics (StatisticsRequest) returns (StatisticsResponse) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -154,3 +157,17 @@ message DeleteCollectionRequest {
 
 message DeleteCollectionResponse {
 }
+
+message StatisticsRequest {
+    string replication = 1;
+    string collection = 2;
+    string ttl = 3;
+}
+message StatisticsResponse {
+    string replication = 1;
+    string collection = 2;
+    string ttl = 3;
+    uint64 total_size = 4;
+    uint64 used_size = 5;
+    uint64 file_count = 6;
+}
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index f4b5355ea..f9e4d9858 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -31,6 +31,8 @@ It has these top-level messages:
 	LookupVolumeResponse
 	DeleteCollectionRequest
 	DeleteCollectionResponse
+	StatisticsRequest
+	StatisticsResponse
 */
 package filer_pb
 
@@ -686,6 +688,94 @@ func (m *DeleteCollectionResponse) String() string            { return proto.Com
 func (*DeleteCollectionResponse) ProtoMessage()               {}
 func (*DeleteCollectionResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
 
+type StatisticsRequest struct {
+	Replication string `protobuf:"bytes,1,opt,name=replication" json:"replication,omitempty"`
+	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+	Ttl         string `protobuf:"bytes,3,opt,name=ttl" json:"ttl,omitempty"`
+}
+
+func (m *StatisticsRequest) Reset()                    { *m = StatisticsRequest{} }
+func (m *StatisticsRequest) String() string            { return proto.CompactTextString(m) }
+func (*StatisticsRequest) ProtoMessage()               {}
+func (*StatisticsRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{22} }
+
+func (m *StatisticsRequest) GetReplication() string {
+	if m != nil {
+		return m.Replication
+	}
+	return ""
+}
+
+func (m *StatisticsRequest) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
+func (m *StatisticsRequest) GetTtl() string {
+	if m != nil {
+		return m.Ttl
+	}
+	return ""
+}
+
+type StatisticsResponse struct {
+	Replication string `protobuf:"bytes,1,opt,name=replication" json:"replication,omitempty"`
+	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+	Ttl         string `protobuf:"bytes,3,opt,name=ttl" json:"ttl,omitempty"`
+	TotalSize   uint64 `protobuf:"varint,4,opt,name=total_size,json=totalSize" json:"total_size,omitempty"`
+	UsedSize    uint64 `protobuf:"varint,5,opt,name=used_size,json=usedSize" json:"used_size,omitempty"`
+	FileCount   uint64 `protobuf:"varint,6,opt,name=file_count,json=fileCount" json:"file_count,omitempty"`
+}
+
+func (m *StatisticsResponse) Reset()                    { *m = StatisticsResponse{} }
+func (m *StatisticsResponse) String() string            { return proto.CompactTextString(m) }
+func (*StatisticsResponse) ProtoMessage()               {}
+func (*StatisticsResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{23} }
+
+func (m *StatisticsResponse) GetReplication() string {
+	if m != nil {
+		return m.Replication
+	}
+	return ""
+}
+
+func (m *StatisticsResponse) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
+func (m *StatisticsResponse) GetTtl() string {
+	if m != nil {
+		return m.Ttl
+	}
+	return ""
+}
+
+func (m *StatisticsResponse) GetTotalSize() uint64 {
+	if m != nil {
+		return m.TotalSize
+	}
+	return 0
+}
+
+func (m *StatisticsResponse) GetUsedSize() uint64 {
+	if m != nil {
+		return m.UsedSize
+	}
+	return 0
+}
+
+func (m *StatisticsResponse) GetFileCount() uint64 {
+	if m != nil {
+		return m.FileCount
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterType((*LookupDirectoryEntryRequest)(nil), "filer_pb.LookupDirectoryEntryRequest")
 	proto.RegisterType((*LookupDirectoryEntryResponse)(nil), "filer_pb.LookupDirectoryEntryResponse")
@@ -709,6 +799,8 @@ func init() {
 	proto.RegisterType((*LookupVolumeResponse)(nil), "filer_pb.LookupVolumeResponse")
 	proto.RegisterType((*DeleteCollectionRequest)(nil), "filer_pb.DeleteCollectionRequest")
 	proto.RegisterType((*DeleteCollectionResponse)(nil), "filer_pb.DeleteCollectionResponse")
+	proto.RegisterType((*StatisticsRequest)(nil), "filer_pb.StatisticsRequest")
+	proto.RegisterType((*StatisticsResponse)(nil), "filer_pb.StatisticsResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -730,6 +822,7 @@ type SeaweedFilerClient interface {
 	AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error)
 	LookupVolume(ctx context.Context, in *LookupVolumeRequest, opts ...grpc.CallOption) (*LookupVolumeResponse, error)
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
+	Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error)
 }
 
 type seaweedFilerClient struct {
@@ -812,6 +905,15 @@ func (c *seaweedFilerClient) DeleteCollection(ctx context.Context, in *DeleteCol
 	return out, nil
 }
 
+func (c *seaweedFilerClient) Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error) {
+	out := new(StatisticsResponse)
+	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/Statistics", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for SeaweedFiler service
 
 type SeaweedFilerServer interface {
@@ -823,6 +925,7 @@ type SeaweedFilerServer interface {
 	AssignVolume(context.Context, *AssignVolumeRequest) (*AssignVolumeResponse, error)
 	LookupVolume(context.Context, *LookupVolumeRequest) (*LookupVolumeResponse, error)
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
+	Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error)
 }
 
 func RegisterSeaweedFilerServer(s *grpc.Server, srv SeaweedFilerServer) {
@@ -973,6 +1076,24 @@ func _SeaweedFiler_DeleteCollection_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SeaweedFiler_Statistics_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(StatisticsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).Statistics(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/Statistics",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).Statistics(ctx, req.(*StatisticsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "filer_pb.SeaweedFiler",
 	HandlerType: (*SeaweedFilerServer)(nil),
@@ -1009,6 +1130,10 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			MethodName: "DeleteCollection",
 			Handler:    _SeaweedFiler_DeleteCollection_Handler,
 		},
+		{
+			MethodName: "Statistics",
+			Handler:    _SeaweedFiler_Statistics_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "filer.proto",
@@ -1017,76 +1142,82 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1129 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xb4, 0x57, 0x4d, 0x6f, 0xdc, 0xc4,
-	0x1b, 0x8f, 0xf7, 0x2d, 0xeb, 0x67, 0x77, 0xf3, 0x6f, 0x66, 0xf3, 0xa7, 0xd6, 0x36, 0x29, 0x5b,
-	0xd3, 0xa2, 0x54, 0x44, 0x51, 0x15, 0x38, 0xb4, 0x54, 0x48, 0x54, 0x79, 0x91, 0x2a, 0xa5, 0xad,
-	0xe4, 0x34, 0x48, 0x88, 0x83, 0xe5, 0xd8, 0x4f, 0xc2, 0x28, 0x5e, 0x7b, 0xf1, 0x8c, 0x93, 0x96,
-	0xaf, 0xc0, 0x95, 0x2b, 0x07, 0x4e, 0xdc, 0x38, 0xf0, 0x01, 0xb8, 0xf0, 0xc5, 0xd0, 0xbc, 0xd8,
-	0x3b, 0x5e, 0x3b, 0x01, 0x84, 0xb8, 0xcd, 0xf3, 0x32, 0xcf, 0xdb, 0xfc, 0xe6, 0x37, 0x36, 0x0c,
-	0xce, 0x69, 0x8c, 0xd9, 0xee, 0x3c, 0x4b, 0x79, 0x4a, 0xfa, 0x52, 0xf0, 0xe7, 0x67, 0xee, 0x1b,
-	0xb8, 0x77, 0x9c, 0xa6, 0x97, 0xf9, 0xfc, 0x80, 0x66, 0x18, 0xf2, 0x34, 0x7b, 0x7f, 0x98, 0xf0,
-	0xec, 0xbd, 0x87, 0xdf, 0xe5, 0xc8, 0x38, 0xd9, 0x04, 0x3b, 0x2a, 0x0c, 0x8e, 0x35, 0xb5, 0xb6,
-	0x6d, 0x6f, 0xa1, 0x20, 0x04, 0x3a, 0x49, 0x30, 0x43, 0xa7, 0x25, 0x0d, 0x72, 0xed, 0x1e, 0xc2,
-	0x66, 0x73, 0x40, 0x36, 0x4f, 0x13, 0x86, 0xe4, 0x11, 0x74, 0x51, 0x28, 0x64, 0xb4, 0xc1, 0xde,
-	0xff, 0x76, 0x8b, 0x52, 0x76, 0x95, 0x9f, 0xb2, 0xba, 0xbf, 0x5b, 0x40, 0x8e, 0x29, 0xe3, 0x42,
-	0x49, 0x91, 0xfd, 0xbd, 0x7a, 0x3e, 0x80, 0xde, 0x3c, 0xc3, 0x73, 0xfa, 0x4e, 0x57, 0xa4, 0x25,
-	0xb2, 0x03, 0xeb, 0x8c, 0x07, 0x19, 0x3f, 0xca, 0xd2, 0xd9, 0x11, 0x8d, 0xf1, 0xb5, 0x28, 0xba,
-	0x2d, 0x5d, 0xea, 0x06, 0xb2, 0x0b, 0x84, 0x26, 0x61, 0x9c, 0x33, 0x7a, 0x85, 0x27, 0x85, 0xd5,
-	0xe9, 0x4c, 0xad, 0xed, 0xbe, 0xd7, 0x60, 0x21, 0x1b, 0xd0, 0x8d, 0xe9, 0x8c, 0x72, 0xa7, 0x3b,
-	0xb5, 0xb6, 0x47, 0x9e, 0x12, 0xdc, 0x2f, 0x61, 0x5c, 0xa9, 0x5f, 0xb7, 0xff, 0x18, 0x56, 0x51,
-	0xa9, 0x1c, 0x6b, 0xda, 0x6e, 0x1a, 0x40, 0x61, 0x77, 0x7f, 0x6a, 0x41, 0x57, 0xaa, 0xca, 0x39,
-	0x5b, 0x8b, 0x39, 0x93, 0x07, 0x30, 0xa4, 0xcc, 0x5f, 0x0c, 0xa3, 0x25, 0xeb, 0x1b, 0x50, 0x56,
-	0xce, 0x9d, 0x7c, 0x02, 0xbd, 0xf0, 0xdb, 0x3c, 0xb9, 0x64, 0x4e, 0x5b, 0xa6, 0x1a, 0x2f, 0x52,
-	0x89, 0x66, 0xf7, 0x85, 0xcd, 0xd3, 0x2e, 0xe4, 0x29, 0x40, 0xc0, 0x79, 0x46, 0xcf, 0x72, 0x8e,
-	0x4c, 0x76, 0x3b, 0xd8, 0x73, 0x8c, 0x0d, 0x39, 0xc3, 0x17, 0xa5, 0xdd, 0x33, 0x7c, 0xc9, 0x33,
-	0xe8, 0xe3, 0x3b, 0x8e, 0x49, 0x84, 0x91, 0xd3, 0x95, 0x89, 0xb6, 0x96, 0x7a, 0xda, 0x3d, 0xd4,
-	0x76, 0xd5, 0x61, 0xe9, 0x3e, 0x79, 0x0e, 0xa3, 0x8a, 0x89, 0xdc, 0x81, 0xf6, 0x25, 0x16, 0x27,
-	0x2b, 0x96, 0x62, 0xba, 0x57, 0x41, 0x9c, 0x2b, 0x90, 0x0d, 0x3d, 0x25, 0x7c, 0xde, 0x7a, 0x6a,
-	0xb9, 0x3f, 0x5a, 0xb0, 0x7e, 0x78, 0x85, 0x09, 0x7f, 0x9d, 0x72, 0x7a, 0x4e, 0xc3, 0x80, 0xd3,
-	0x34, 0x21, 0x3b, 0x60, 0xa7, 0x71, 0xe4, 0xdf, 0x8a, 0xb1, 0x7e, 0x1a, 0xeb, 0x7c, 0x3b, 0x60,
-	0x27, 0x78, 0xad, 0xbd, 0x5b, 0x37, 0x78, 0x27, 0x78, 0xad, 0xbc, 0x3f, 0x82, 0x51, 0x84, 0x31,
-	0x72, 0xf4, 0xcb, 0xb9, 0x8a, 0xa1, 0x0f, 0x95, 0x52, 0xce, 0x93, 0xb9, 0x3f, 0x5b, 0x60, 0x97,
-	0xe3, 0x25, 0x77, 0x61, 0x55, 0x84, 0xf3, 0x69, 0xa4, 0x9b, 0xea, 0x09, 0xf1, 0x65, 0x24, 0xb0,
-	0x9a, 0x9e, 0x9f, 0x33, 0xe4, 0x32, 0x6d, 0xdb, 0xd3, 0x92, 0x38, 0x6b, 0x46, 0xbf, 0x57, 0xf0,
-	0xec, 0x78, 0x72, 0x2d, 0x66, 0x30, 0xe3, 0x74, 0x86, 0xf2, 0x58, 0xda, 0x9e, 0x12, 0xc8, 0x18,
-	0xba, 0xe8, 0xf3, 0xe0, 0x42, 0xe2, 0xce, 0xf6, 0x3a, 0xf8, 0x36, 0xb8, 0x20, 0x0f, 0x61, 0x8d,
-	0xa5, 0x79, 0x16, 0xa2, 0x5f, 0xa4, 0xed, 0x49, 0xeb, 0x50, 0x69, 0x8f, 0x64, 0x72, 0xf7, 0x87,
-	0x16, 0xac, 0x55, 0x4f, 0x94, 0xdc, 0x03, 0x5b, 0xee, 0x90, 0xc9, 0x2d, 0x99, 0x5c, 0xb2, 0xc4,
-	0x49, 0xa5, 0x80, 0x96, 0x59, 0x40, 0xb1, 0x65, 0x96, 0x46, 0xaa, 0xde, 0x91, 0xda, 0xf2, 0x2a,
-	0x8d, 0x50, 0x9c, 0x64, 0x4e, 0x23, 0x59, 0xf1, 0xc8, 0x13, 0x4b, 0xa1, 0xb9, 0xa0, 0x91, 0xbe,
-	0x25, 0x62, 0x29, 0x66, 0x10, 0x66, 0x32, 0x6e, 0x4f, 0xcd, 0x40, 0x49, 0x62, 0x06, 0x33, 0xa1,
-	0x5d, 0x55, 0x8d, 0x89, 0x35, 0x99, 0xc2, 0x20, 0xc3, 0x79, 0xac, 0x8f, 0xd9, 0xe9, 0x4b, 0x93,
-	0xa9, 0x22, 0xf7, 0x01, 0xc2, 0x34, 0x8e, 0x31, 0x94, 0x0e, 0xb6, 0x74, 0x30, 0x34, 0xe2, 0x28,
-	0x38, 0x8f, 0x7d, 0x86, 0xa1, 0x03, 0x53, 0x6b, 0xbb, 0xeb, 0xf5, 0x38, 0x8f, 0x4f, 0x30, 0x74,
-	0xbf, 0x06, 0xb2, 0x9f, 0x61, 0xc0, 0xf1, 0x1f, 0x50, 0x5f, 0x49, 0x63, 0xad, 0x5b, 0x69, 0xec,
-	0xff, 0x30, 0xae, 0x84, 0x56, 0x2c, 0x20, 0x32, 0x9e, 0xce, 0xa3, 0xff, 0x2a, 0x63, 0x25, 0xb4,
-	0xce, 0xf8, 0x9b, 0x05, 0xe4, 0x40, 0xc2, 0xf4, 0xdf, 0xf1, 0x7b, 0x8d, 0x77, 0xda, 0x75, 0xde,
-	0x79, 0x08, 0x6b, 0xc2, 0x45, 0xdd, 0x94, 0x28, 0xe0, 0x81, 0x26, 0xcf, 0x21, 0x65, 0xaa, 0x84,
-	0x83, 0x80, 0x07, 0x3a, 0x50, 0x86, 0x61, 0x9e, 0x09, 0x3e, 0x95, 0xb8, 0x90, 0x81, 0xbc, 0x42,
-	0x25, 0x7a, 0xa9, 0xd4, 0xac, 0x7b, 0xf9, 0xc5, 0x82, 0xf1, 0x0b, 0xc6, 0xe8, 0x45, 0xf2, 0x55,
-	0x1a, 0xe7, 0x33, 0x2c, 0x9a, 0xd9, 0x80, 0x6e, 0x98, 0xe6, 0x09, 0x97, 0x8d, 0x74, 0x3d, 0x25,
-	0x2c, 0xc1, 0xa2, 0x55, 0x83, 0xc5, 0x12, 0xb0, 0xda, 0x75, 0x60, 0x19, 0xc0, 0xe9, 0x98, 0xc0,
-	0x21, 0x1f, 0xc2, 0x40, 0xb4, 0xe7, 0x87, 0x98, 0x70, 0xcc, 0xf4, 0x3d, 0x04, 0xa1, 0xda, 0x97,
-	0x1a, 0xf7, 0x0a, 0x36, 0xaa, 0x85, 0xea, 0x57, 0xe0, 0x46, 0x56, 0x10, 0xb7, 0x26, 0x8b, 0x75,
-	0x95, 0x62, 0x49, 0xb6, 0x00, 0xe6, 0xf9, 0x59, 0x4c, 0x43, 0x5f, 0x18, 0x54, 0x75, 0xb6, 0xd2,
-	0x9c, 0x66, 0xf1, 0xa2, 0xe7, 0x8e, 0xd1, 0xb3, 0xfb, 0x19, 0x8c, 0xd5, 0x23, 0x5c, 0x1d, 0xd0,
-	0x16, 0xc0, 0x95, 0x54, 0xf8, 0x34, 0x52, 0xef, 0x8f, 0xed, 0xd9, 0x4a, 0xf3, 0x32, 0x62, 0xee,
-	0x17, 0x60, 0x1f, 0xa7, 0xaa, 0x67, 0x46, 0x9e, 0x80, 0x1d, 0x17, 0x82, 0x7e, 0xaa, 0xc8, 0x02,
-	0x72, 0x85, 0x9f, 0xb7, 0x70, 0x72, 0x9f, 0x43, 0xbf, 0x50, 0x17, 0x7d, 0x58, 0x37, 0xf5, 0xd1,
-	0x5a, 0xea, 0xc3, 0xfd, 0xc3, 0x82, 0x8d, 0x6a, 0xc9, 0x7a, 0x54, 0xa7, 0x30, 0x2a, 0x53, 0xf8,
-	0xb3, 0x60, 0xae, 0x6b, 0x79, 0x62, 0xd6, 0x52, 0xdf, 0x56, 0x16, 0xc8, 0x5e, 0x05, 0x73, 0x85,
-	0x9e, 0x61, 0x6c, 0xa8, 0x26, 0x6f, 0x61, 0xbd, 0xe6, 0xd2, 0xf0, 0xfa, 0x3c, 0x36, 0x5f, 0x9f,
-	0xca, 0x0b, 0x5a, 0xee, 0x36, 0x9f, 0xa4, 0x67, 0x70, 0x57, 0x01, 0x76, 0xbf, 0xc4, 0x57, 0x31,
-	0xfb, 0x2a, 0x0c, 0xad, 0x65, 0x18, 0xba, 0x13, 0x70, 0xea, 0x5b, 0x55, 0x33, 0x7b, 0xbf, 0x76,
-	0x61, 0x78, 0x82, 0xc1, 0x35, 0x62, 0x24, 0x08, 0x3c, 0x23, 0x17, 0xc5, 0xb0, 0xaa, 0x1f, 0x59,
-	0xe4, 0xd1, 0xf2, 0x54, 0x1a, 0xbf, 0xea, 0x26, 0x1f, 0xff, 0x95, 0x9b, 0xbe, 0x68, 0x2b, 0xe4,
-	0x18, 0x06, 0xc6, 0x57, 0x0c, 0xd9, 0x34, 0x36, 0xd6, 0x3e, 0xce, 0x26, 0x5b, 0x37, 0x58, 0xcd,
-	0x68, 0x06, 0x1b, 0x9a, 0xd1, 0xea, 0xfc, 0x6b, 0x46, 0x6b, 0xa2, 0x50, 0x19, 0xcd, 0x60, 0x3a,
-	0x33, 0x5a, 0x9d, 0x5b, 0xcd, 0x68, 0x4d, 0xf4, 0x28, 0xa3, 0x19, 0x5c, 0x63, 0x46, 0xab, 0xd3,
-	0xa6, 0x19, 0xad, 0x89, 0xa0, 0x56, 0xc8, 0x1b, 0x18, 0x9a, 0x17, 0x9f, 0x18, 0x1b, 0x1a, 0x98,
-	0x6b, 0x72, 0xff, 0x26, 0xb3, 0x19, 0xd0, 0xc4, 0xb9, 0x19, 0xb0, 0xe1, 0xa6, 0x9b, 0x01, 0x9b,
-	0xae, 0x87, 0xbb, 0x42, 0xbe, 0x81, 0x3b, 0xcb, 0x78, 0x23, 0x0f, 0x96, 0xdb, 0xaa, 0xc1, 0x78,
-	0xe2, 0xde, 0xe6, 0x52, 0x04, 0x3f, 0xeb, 0xc9, 0xdf, 0x8c, 0x4f, 0xff, 0x0c, 0x00, 0x00, 0xff,
-	0xff, 0x04, 0x12, 0x06, 0xcd, 0x75, 0x0c, 0x00, 0x00,
+	// 1225 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xb4, 0x57, 0x4b, 0x6f, 0xdb, 0xc6,
+	0x13, 0x0f, 0xf5, 0x8a, 0x38, 0x92, 0xfc, 0xb7, 0x57, 0xfe, 0x37, 0x82, 0x6c, 0xa7, 0x0a, 0x9b,
+	0x14, 0x0e, 0x6a, 0x18, 0x81, 0xdb, 0x43, 0xd2, 0xa0, 0x40, 0x03, 0x3f, 0x00, 0x03, 0x4e, 0x02,
+	0xd0, 0x71, 0x81, 0xa2, 0x07, 0x82, 0x26, 0xc7, 0xea, 0xc2, 0x14, 0xa9, 0x72, 0x97, 0x76, 0xd2,
+	0xaf, 0xd0, 0x6b, 0xaf, 0x3d, 0xf4, 0xd4, 0x7b, 0x3f, 0x40, 0x2f, 0xfd, 0x54, 0xbd, 0x15, 0xfb,
+	0x20, 0xb5, 0x14, 0x69, 0xa7, 0x45, 0x91, 0xdb, 0xee, 0x6f, 0x66, 0xe7, 0xb5, 0xbf, 0x9d, 0x21,
+	0xa1, 0x77, 0x41, 0x23, 0x4c, 0x77, 0xe7, 0x69, 0xc2, 0x13, 0xd2, 0x95, 0x1b, 0x6f, 0x7e, 0xee,
+	0xbc, 0x86, 0x8d, 0x93, 0x24, 0xb9, 0xcc, 0xe6, 0x07, 0x34, 0xc5, 0x80, 0x27, 0xe9, 0xbb, 0xc3,
+	0x98, 0xa7, 0xef, 0x5c, 0xfc, 0x21, 0x43, 0xc6, 0xc9, 0x26, 0xd8, 0x61, 0x2e, 0x18, 0x59, 0x13,
+	0x6b, 0xdb, 0x76, 0x17, 0x00, 0x21, 0xd0, 0x8a, 0xfd, 0x19, 0x8e, 0x1a, 0x52, 0x20, 0xd7, 0xce,
+	0x21, 0x6c, 0xd6, 0x1b, 0x64, 0xf3, 0x24, 0x66, 0x48, 0x1e, 0x41, 0x1b, 0x05, 0x20, 0xad, 0xf5,
+	0xf6, 0xfe, 0xb7, 0x9b, 0x87, 0xb2, 0xab, 0xf4, 0x94, 0xd4, 0xf9, 0xc3, 0x02, 0x72, 0x42, 0x19,
+	0x17, 0x20, 0x45, 0xf6, 0xcf, 0xe2, 0xf9, 0x08, 0x3a, 0xf3, 0x14, 0x2f, 0xe8, 0x5b, 0x1d, 0x91,
+	0xde, 0x91, 0x1d, 0x58, 0x63, 0xdc, 0x4f, 0xf9, 0x51, 0x9a, 0xcc, 0x8e, 0x68, 0x84, 0xaf, 0x44,
+	0xd0, 0x4d, 0xa9, 0x52, 0x15, 0x90, 0x5d, 0x20, 0x34, 0x0e, 0xa2, 0x8c, 0xd1, 0x2b, 0x3c, 0xcd,
+	0xa5, 0xa3, 0xd6, 0xc4, 0xda, 0xee, 0xba, 0x35, 0x12, 0xb2, 0x0e, 0xed, 0x88, 0xce, 0x28, 0x1f,
+	0xb5, 0x27, 0xd6, 0xf6, 0xc0, 0x55, 0x1b, 0xe7, 0x6b, 0x18, 0x96, 0xe2, 0xd7, 0xe9, 0x3f, 0x86,
+	0xbb, 0xa8, 0xa0, 0x91, 0x35, 0x69, 0xd6, 0x15, 0x20, 0x97, 0x3b, 0xbf, 0x34, 0xa0, 0x2d, 0xa1,
+	0xa2, 0xce, 0xd6, 0xa2, 0xce, 0xe4, 0x01, 0xf4, 0x29, 0xf3, 0x16, 0xc5, 0x68, 0xc8, 0xf8, 0x7a,
+	0x94, 0x15, 0x75, 0x27, 0x9f, 0x41, 0x27, 0xf8, 0x3e, 0x8b, 0x2f, 0xd9, 0xa8, 0x29, 0x5d, 0x0d,
+	0x17, 0xae, 0x44, 0xb2, 0xfb, 0x42, 0xe6, 0x6a, 0x15, 0xf2, 0x14, 0xc0, 0xe7, 0x3c, 0xa5, 0xe7,
+	0x19, 0x47, 0x26, 0xb3, 0xed, 0xed, 0x8d, 0x8c, 0x03, 0x19, 0xc3, 0x17, 0x85, 0xdc, 0x35, 0x74,
+	0xc9, 0x33, 0xe8, 0xe2, 0x5b, 0x8e, 0x71, 0x88, 0xe1, 0xa8, 0x2d, 0x1d, 0x6d, 0x2d, 0xe5, 0xb4,
+	0x7b, 0xa8, 0xe5, 0x2a, 0xc3, 0x42, 0x7d, 0xfc, 0x1c, 0x06, 0x25, 0x11, 0x59, 0x85, 0xe6, 0x25,
+	0xe6, 0x37, 0x2b, 0x96, 0xa2, 0xba, 0x57, 0x7e, 0x94, 0x29, 0x92, 0xf5, 0x5d, 0xb5, 0xf9, 0xb2,
+	0xf1, 0xd4, 0x72, 0x7e, 0xb6, 0x60, 0xed, 0xf0, 0x0a, 0x63, 0xfe, 0x2a, 0xe1, 0xf4, 0x82, 0x06,
+	0x3e, 0xa7, 0x49, 0x4c, 0x76, 0xc0, 0x4e, 0xa2, 0xd0, 0xbb, 0x95, 0x63, 0xdd, 0x24, 0xd2, 0xfe,
+	0x76, 0xc0, 0x8e, 0xf1, 0x5a, 0x6b, 0x37, 0x6e, 0xd0, 0x8e, 0xf1, 0x5a, 0x69, 0x7f, 0x02, 0x83,
+	0x10, 0x23, 0xe4, 0xe8, 0x15, 0x75, 0x15, 0x45, 0xef, 0x2b, 0x50, 0xd6, 0x93, 0x39, 0xbf, 0x5a,
+	0x60, 0x17, 0xe5, 0x25, 0xf7, 0xe0, 0xae, 0x30, 0xe7, 0xd1, 0x50, 0x27, 0xd5, 0x11, 0xdb, 0xe3,
+	0x50, 0x70, 0x35, 0xb9, 0xb8, 0x60, 0xc8, 0xa5, 0xdb, 0xa6, 0xab, 0x77, 0xe2, 0xae, 0x19, 0xfd,
+	0x51, 0xd1, 0xb3, 0xe5, 0xca, 0xb5, 0xa8, 0xc1, 0x8c, 0xd3, 0x19, 0xca, 0x6b, 0x69, 0xba, 0x6a,
+	0x43, 0x86, 0xd0, 0x46, 0x8f, 0xfb, 0x53, 0xc9, 0x3b, 0xdb, 0x6d, 0xe1, 0x1b, 0x7f, 0x4a, 0x1e,
+	0xc2, 0x0a, 0x4b, 0xb2, 0x34, 0x40, 0x2f, 0x77, 0xdb, 0x91, 0xd2, 0xbe, 0x42, 0x8f, 0xa4, 0x73,
+	0xe7, 0xa7, 0x06, 0xac, 0x94, 0x6f, 0x94, 0x6c, 0x80, 0x2d, 0x4f, 0x48, 0xe7, 0x96, 0x74, 0x2e,
+	0xbb, 0xc4, 0x69, 0x29, 0x80, 0x86, 0x19, 0x40, 0x7e, 0x64, 0x96, 0x84, 0x2a, 0xde, 0x81, 0x3a,
+	0xf2, 0x32, 0x09, 0x51, 0xdc, 0x64, 0x46, 0x43, 0x19, 0xf1, 0xc0, 0x15, 0x4b, 0x81, 0x4c, 0x69,
+	0xa8, 0x5f, 0x89, 0x58, 0x8a, 0x1a, 0x04, 0xa9, 0xb4, 0xdb, 0x51, 0x35, 0x50, 0x3b, 0x51, 0x83,
+	0x99, 0x40, 0xef, 0xaa, 0xc4, 0xc4, 0x9a, 0x4c, 0xa0, 0x97, 0xe2, 0x3c, 0xd2, 0xd7, 0x3c, 0xea,
+	0x4a, 0x91, 0x09, 0x91, 0xfb, 0x00, 0x41, 0x12, 0x45, 0x18, 0x48, 0x05, 0x5b, 0x2a, 0x18, 0x88,
+	0xb8, 0x0a, 0xce, 0x23, 0x8f, 0x61, 0x30, 0x82, 0x89, 0xb5, 0xdd, 0x76, 0x3b, 0x9c, 0x47, 0xa7,
+	0x18, 0x38, 0xdf, 0x02, 0xd9, 0x4f, 0xd1, 0xe7, 0xf8, 0x2f, 0x5a, 0x5f, 0xd1, 0xc6, 0x1a, 0xb7,
+	0xb6, 0xb1, 0xff, 0xc3, 0xb0, 0x64, 0x5a, 0x75, 0x01, 0xe1, 0xf1, 0x6c, 0x1e, 0x7e, 0x28, 0x8f,
+	0x25, 0xd3, 0xda, 0xe3, 0xef, 0x16, 0x90, 0x03, 0x49, 0xd3, 0xff, 0xd6, 0xdf, 0x2b, 0x7d, 0xa7,
+	0x59, 0xed, 0x3b, 0x0f, 0x61, 0x45, 0xa8, 0xa8, 0x97, 0x12, 0xfa, 0xdc, 0xd7, 0xcd, 0xb3, 0x4f,
+	0x99, 0x0a, 0xe1, 0xc0, 0xe7, 0xbe, 0x36, 0x94, 0x62, 0x90, 0xa5, 0xa2, 0x9f, 0x4a, 0x5e, 0x48,
+	0x43, 0x6e, 0x0e, 0x89, 0x5c, 0x4a, 0x31, 0xeb, 0x5c, 0x7e, 0xb3, 0x60, 0xf8, 0x82, 0x31, 0x3a,
+	0x8d, 0xbf, 0x49, 0xa2, 0x6c, 0x86, 0x79, 0x32, 0xeb, 0xd0, 0x0e, 0x92, 0x2c, 0xe6, 0x32, 0x91,
+	0xb6, 0xab, 0x36, 0x4b, 0xb4, 0x68, 0x54, 0x68, 0xb1, 0x44, 0xac, 0x66, 0x95, 0x58, 0x06, 0x71,
+	0x5a, 0x26, 0x71, 0xc8, 0xc7, 0xd0, 0x13, 0xe9, 0x79, 0x01, 0xc6, 0x1c, 0x53, 0xfd, 0x0e, 0x41,
+	0x40, 0xfb, 0x12, 0x71, 0xae, 0x60, 0xbd, 0x1c, 0xa8, 0x9e, 0x02, 0x37, 0x76, 0x05, 0xf1, 0x6a,
+	0xd2, 0x48, 0x47, 0x29, 0x96, 0x64, 0x0b, 0x60, 0x9e, 0x9d, 0x47, 0x34, 0xf0, 0x84, 0x40, 0x45,
+	0x67, 0x2b, 0xe4, 0x2c, 0x8d, 0x16, 0x39, 0xb7, 0x8c, 0x9c, 0x9d, 0x2f, 0x60, 0xa8, 0x86, 0x70,
+	0xb9, 0x40, 0x5b, 0x00, 0x57, 0x12, 0xf0, 0x68, 0xa8, 0xe6, 0x8f, 0xed, 0xda, 0x0a, 0x39, 0x0e,
+	0x99, 0xf3, 0x15, 0xd8, 0x27, 0x89, 0xca, 0x99, 0x91, 0x27, 0x60, 0x47, 0xf9, 0x46, 0x8f, 0x2a,
+	0xb2, 0xa0, 0x5c, 0xae, 0xe7, 0x2e, 0x94, 0x9c, 0xe7, 0xd0, 0xcd, 0xe1, 0x3c, 0x0f, 0xeb, 0xa6,
+	0x3c, 0x1a, 0x4b, 0x79, 0x38, 0x7f, 0x5a, 0xb0, 0x5e, 0x0e, 0x59, 0x97, 0xea, 0x0c, 0x06, 0x85,
+	0x0b, 0x6f, 0xe6, 0xcf, 0x75, 0x2c, 0x4f, 0xcc, 0x58, 0xaa, 0xc7, 0x8a, 0x00, 0xd9, 0x4b, 0x7f,
+	0xae, 0xd8, 0xd3, 0x8f, 0x0c, 0x68, 0xfc, 0x06, 0xd6, 0x2a, 0x2a, 0x35, 0xd3, 0xe7, 0xb1, 0x39,
+	0x7d, 0x4a, 0x13, 0xb4, 0x38, 0x6d, 0x8e, 0xa4, 0x67, 0x70, 0x4f, 0x11, 0x76, 0xbf, 0xe0, 0x57,
+	0x5e, 0xfb, 0x32, 0x0d, 0xad, 0x65, 0x1a, 0x3a, 0x63, 0x18, 0x55, 0x8f, 0x6a, 0xc2, 0x4f, 0x61,
+	0xed, 0x94, 0xfb, 0x9c, 0x32, 0x4e, 0x83, 0xe2, 0x53, 0x68, 0x89, 0xb7, 0xd6, 0xfb, 0x1a, 0x62,
+	0x95, 0xf9, 0xab, 0xd0, 0xe4, 0x3c, 0xe7, 0x94, 0x58, 0x8a, 0x5b, 0x20, 0xa6, 0x27, 0x7d, 0x07,
+	0x1f, 0xc0, 0x95, 0xe0, 0x03, 0x4f, 0xb8, 0x1f, 0xa9, 0x81, 0xd3, 0x92, 0x03, 0xc7, 0x96, 0x88,
+	0x9c, 0x38, 0x1b, 0x60, 0x67, 0x0c, 0x43, 0x25, 0x6d, 0xab, 0x71, 0x24, 0x00, 0x29, 0xdc, 0x02,
+	0x90, 0xcf, 0x47, 0x31, 0xbf, 0xa3, 0xce, 0x0a, 0x64, 0x5f, 0x00, 0x7b, 0x7f, 0xb5, 0xa1, 0x7f,
+	0x8a, 0xfe, 0x35, 0x62, 0x28, 0xe6, 0x5d, 0x4a, 0xa6, 0x39, 0xb7, 0xca, 0xdf, 0xa4, 0xe4, 0xd1,
+	0x32, 0x89, 0x6a, 0x3f, 0x82, 0xc7, 0x9f, 0xbe, 0x4f, 0x4d, 0x5f, 0xd3, 0x1d, 0x72, 0x02, 0x3d,
+	0xe3, 0xa3, 0x8f, 0x6c, 0x1a, 0x07, 0x2b, 0xdf, 0xb2, 0xe3, 0xad, 0x1b, 0xa4, 0xa6, 0x35, 0x63,
+	0x78, 0x98, 0xd6, 0xaa, 0xe3, 0xca, 0xb4, 0x56, 0x37, 0x71, 0xa4, 0x35, 0x63, 0x30, 0x98, 0xd6,
+	0xaa, 0xa3, 0xc8, 0xb4, 0x56, 0x37, 0x4d, 0xa4, 0x35, 0xa3, 0x35, 0x9b, 0xd6, 0xaa, 0x53, 0xc6,
+	0xb4, 0x56, 0xd7, 0xcf, 0xef, 0x90, 0xd7, 0xd0, 0x37, 0xfb, 0x24, 0x31, 0x0e, 0xd4, 0x34, 0xfa,
+	0xf1, 0xfd, 0x9b, 0xc4, 0xa6, 0x41, 0xb3, 0x2d, 0x98, 0x06, 0x6b, 0x1a, 0xa3, 0x69, 0xb0, 0xae,
+	0x9b, 0x38, 0x77, 0xc8, 0x77, 0xb0, 0xba, 0xfc, 0x3c, 0xc9, 0x83, 0xe5, 0xb4, 0x2a, 0xaf, 0x7e,
+	0xec, 0xdc, 0xa6, 0x52, 0x18, 0x3f, 0x06, 0x58, 0xbc, 0x3a, 0xb2, 0xb1, 0x38, 0x53, 0x79, 0xf5,
+	0xe3, 0xcd, 0x7a, 0x61, 0x6e, 0xea, 0xbc, 0x23, 0x7f, 0xf0, 0x3e, 0xff, 0x3b, 0x00, 0x00, 0xff,
+	0xff, 0xd6, 0x35, 0x68, 0xc8, 0xef, 0x0d, 0x00, 0x00,
 }
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index c1e5d4798..544160c06 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -13,6 +13,8 @@ service Seaweed {
     }
     rpc Assign (AssignRequest) returns (AssignResponse) {
     }
+    rpc Statistics (StatisticsRequest) returns (StatisticsResponse) {
+    }
 }
 
 //////////////////////////////////////////////////
@@ -108,3 +110,17 @@ message AssignResponse {
     uint64 count = 4;
     string error = 5;
 }
+
+message StatisticsRequest {
+    string replication = 1;
+    string collection = 2;
+    string ttl = 3;
+}
+message StatisticsResponse {
+    string replication = 1;
+    string collection = 2;
+    string ttl = 3;
+    uint64 total_size = 4;
+    uint64 used_size = 5;
+    uint64 file_count = 6;
+}
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 79d4d3f53..894f08471 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -21,6 +21,8 @@ It has these top-level messages:
 	Location
 	AssignRequest
 	AssignResponse
+	StatisticsRequest
+	StatisticsResponse
 */
 package master_pb
 
@@ -585,6 +587,94 @@ func (m *AssignResponse) GetError() string {
 	return ""
 }
 
+type StatisticsRequest struct {
+	Replication string `protobuf:"bytes,1,opt,name=replication" json:"replication,omitempty"`
+	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+	Ttl         string `protobuf:"bytes,3,opt,name=ttl" json:"ttl,omitempty"`
+}
+
+func (m *StatisticsRequest) Reset()                    { *m = StatisticsRequest{} }
+func (m *StatisticsRequest) String() string            { return proto.CompactTextString(m) }
+func (*StatisticsRequest) ProtoMessage()               {}
+func (*StatisticsRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{12} }
+
+func (m *StatisticsRequest) GetReplication() string {
+	if m != nil {
+		return m.Replication
+	}
+	return ""
+}
+
+func (m *StatisticsRequest) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
+func (m *StatisticsRequest) GetTtl() string {
+	if m != nil {
+		return m.Ttl
+	}
+	return ""
+}
+
+type StatisticsResponse struct {
+	Replication string `protobuf:"bytes,1,opt,name=replication" json:"replication,omitempty"`
+	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
+	Ttl         string `protobuf:"bytes,3,opt,name=ttl" json:"ttl,omitempty"`
+	TotalSize   uint64 `protobuf:"varint,4,opt,name=total_size,json=totalSize" json:"total_size,omitempty"`
+	UsedSize    uint64 `protobuf:"varint,5,opt,name=used_size,json=usedSize" json:"used_size,omitempty"`
+	FileCount   uint64 `protobuf:"varint,6,opt,name=file_count,json=fileCount" json:"file_count,omitempty"`
+}
+
+func (m *StatisticsResponse) Reset()                    { *m = StatisticsResponse{} }
+func (m *StatisticsResponse) String() string            { return proto.CompactTextString(m) }
+func (*StatisticsResponse) ProtoMessage()               {}
+func (*StatisticsResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
+
+func (m *StatisticsResponse) GetReplication() string {
+	if m != nil {
+		return m.Replication
+	}
+	return ""
+}
+
+func (m *StatisticsResponse) GetCollection() string {
+	if m != nil {
+		return m.Collection
+	}
+	return ""
+}
+
+func (m *StatisticsResponse) GetTtl() string {
+	if m != nil {
+		return m.Ttl
+	}
+	return ""
+}
+
+func (m *StatisticsResponse) GetTotalSize() uint64 {
+	if m != nil {
+		return m.TotalSize
+	}
+	return 0
+}
+
+func (m *StatisticsResponse) GetUsedSize() uint64 {
+	if m != nil {
+		return m.UsedSize
+	}
+	return 0
+}
+
+func (m *StatisticsResponse) GetFileCount() uint64 {
+	if m != nil {
+		return m.FileCount
+	}
+	return 0
+}
+
 func init() {
 	proto.RegisterType((*Heartbeat)(nil), "master_pb.Heartbeat")
 	proto.RegisterType((*HeartbeatResponse)(nil), "master_pb.HeartbeatResponse")
@@ -600,6 +690,8 @@ func init() {
 	proto.RegisterType((*Location)(nil), "master_pb.Location")
 	proto.RegisterType((*AssignRequest)(nil), "master_pb.AssignRequest")
 	proto.RegisterType((*AssignResponse)(nil), "master_pb.AssignResponse")
+	proto.RegisterType((*StatisticsRequest)(nil), "master_pb.StatisticsRequest")
+	proto.RegisterType((*StatisticsResponse)(nil), "master_pb.StatisticsResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -617,6 +709,7 @@ type SeaweedClient interface {
 	KeepConnected(ctx context.Context, opts ...grpc.CallOption) (Seaweed_KeepConnectedClient, error)
 	LookupVolume(ctx context.Context, in *LookupVolumeRequest, opts ...grpc.CallOption) (*LookupVolumeResponse, error)
 	Assign(ctx context.Context, in *AssignRequest, opts ...grpc.CallOption) (*AssignResponse, error)
+	Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error)
 }
 
 type seaweedClient struct {
@@ -707,6 +800,15 @@ func (c *seaweedClient) Assign(ctx context.Context, in *AssignRequest, opts ...g
 	return out, nil
 }
 
+func (c *seaweedClient) Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error) {
+	out := new(StatisticsResponse)
+	err := grpc.Invoke(ctx, "/master_pb.Seaweed/Statistics", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for Seaweed service
 
 type SeaweedServer interface {
@@ -714,6 +816,7 @@ type SeaweedServer interface {
 	KeepConnected(Seaweed_KeepConnectedServer) error
 	LookupVolume(context.Context, *LookupVolumeRequest) (*LookupVolumeResponse, error)
 	Assign(context.Context, *AssignRequest) (*AssignResponse, error)
+	Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error)
 }
 
 func RegisterSeaweedServer(s *grpc.Server, srv SeaweedServer) {
@@ -808,6 +911,24 @@ func _Seaweed_Assign_Handler(srv interface{}, ctx context.Context, dec func(inte
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Seaweed_Statistics_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(StatisticsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).Statistics(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/Statistics",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).Statistics(ctx, req.(*StatisticsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Seaweed_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "master_pb.Seaweed",
 	HandlerType: (*SeaweedServer)(nil),
@@ -820,6 +941,10 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Assign",
 			Handler:    _Seaweed_Assign_Handler,
 		},
+		{
+			MethodName: "Statistics",
+			Handler:    _Seaweed_Statistics_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
@@ -841,66 +966,71 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("master.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 971 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x9c, 0x56, 0xcd, 0x6e, 0x23, 0x45,
-	0x17, 0x4d, 0xb7, 0x7f, 0xfb, 0x3a, 0xce, 0x38, 0x95, 0xe8, 0x53, 0x8f, 0x67, 0xbe, 0x19, 0xd3,
-	0x6c, 0x8c, 0x40, 0xd1, 0x10, 0x96, 0x08, 0x21, 0xc6, 0x0a, 0x22, 0x4a, 0x60, 0x42, 0x07, 0x66,
-	0xc1, 0xa6, 0x29, 0x77, 0xdf, 0x44, 0xa5, 0xf4, 0x1f, 0x55, 0xe5, 0xc4, 0x9e, 0x0d, 0xef, 0xc5,
-	0x82, 0x15, 0x3b, 0x1e, 0x85, 0x1d, 0x4f, 0x80, 0xea, 0xa7, 0xdb, 0x6d, 0x27, 0x61, 0x24, 0x76,
-	0x55, 0xa7, 0xef, 0xad, 0x3a, 0x75, 0xce, 0xbd, 0x55, 0x0d, 0xbb, 0x19, 0x15, 0x12, 0xf9, 0x51,
-	0xc9, 0x0b, 0x59, 0x10, 0xcf, 0xcc, 0xa2, 0x72, 0x1e, 0xfc, 0xe5, 0x82, 0xf7, 0x0d, 0x52, 0x2e,
-	0xe7, 0x48, 0x25, 0xd9, 0x03, 0x97, 0x95, 0xbe, 0x33, 0x71, 0xa6, 0x5e, 0xe8, 0xb2, 0x92, 0x10,
-	0x68, 0x97, 0x05, 0x97, 0xbe, 0x3b, 0x71, 0xa6, 0xc3, 0x50, 0x8f, 0xc9, 0xff, 0x01, 0xca, 0xc5,
-	0x3c, 0x65, 0x71, 0xb4, 0xe0, 0xa9, 0xdf, 0xd2, 0xb1, 0x9e, 0x41, 0x7e, 0xe4, 0x29, 0x99, 0xc2,
-	0x28, 0xa3, 0xcb, 0xe8, 0xb6, 0x48, 0x17, 0x19, 0x46, 0x71, 0xb1, 0xc8, 0xa5, 0xdf, 0xd6, 0xe9,
-	0x7b, 0x19, 0x5d, 0xbe, 0xd5, 0xf0, 0x4c, 0xa1, 0x64, 0xa2, 0x58, 0x2d, 0xa3, 0x2b, 0x96, 0x62,
-	0x74, 0x83, 0x2b, 0xbf, 0x33, 0x71, 0xa6, 0xed, 0x10, 0x32, 0xba, 0xfc, 0x9a, 0xa5, 0x78, 0x86,
-	0x2b, 0xf2, 0x12, 0x06, 0x09, 0x95, 0x34, 0x8a, 0x31, 0x97, 0xc8, 0xfd, 0xae, 0xde, 0x0b, 0x14,
-	0x34, 0xd3, 0x88, 0xe2, 0xc7, 0x69, 0x7c, 0xe3, 0xf7, 0xf4, 0x17, 0x3d, 0x56, 0xfc, 0x68, 0x92,
-	0xb1, 0x3c, 0xd2, 0xcc, 0xfb, 0x7a, 0x6b, 0x4f, 0x23, 0x17, 0x8a, 0xfe, 0x17, 0xd0, 0x33, 0xdc,
-	0x84, 0xef, 0x4d, 0x5a, 0xd3, 0xc1, 0xf1, 0x87, 0x47, 0xb5, 0x1a, 0x47, 0x86, 0xde, 0x69, 0x7e,
-	0x55, 0xf0, 0x8c, 0x4a, 0x56, 0xe4, 0xdf, 0xa2, 0x10, 0xf4, 0x1a, 0xc3, 0x2a, 0x87, 0x3c, 0x85,
-	0x7e, 0x8e, 0x77, 0xd1, 0x2d, 0x4b, 0x84, 0x0f, 0x93, 0xd6, 0x74, 0x18, 0xf6, 0x72, 0xbc, 0x7b,
-	0xcb, 0x12, 0x41, 0x3e, 0x80, 0xdd, 0x04, 0x53, 0x94, 0x98, 0x98, 0xcf, 0x03, 0xfd, 0x79, 0x60,
-	0x31, 0x15, 0x12, 0x08, 0xd8, 0xaf, 0xc5, 0x0e, 0x51, 0x94, 0x45, 0x2e, 0x90, 0x4c, 0xe1, 0x89,
-	0x59, 0xfd, 0x92, 0xbd, 0xc3, 0x73, 0x96, 0x31, 0xa9, 0x1d, 0x68, 0x87, 0xdb, 0x30, 0x79, 0x0e,
-	0x9e, 0xc0, 0x98, 0xa3, 0x3c, 0xc3, 0x95, 0xf6, 0xc4, 0x0b, 0xd7, 0x00, 0xf9, 0x1f, 0x74, 0x53,
-	0xa4, 0x09, 0x72, 0x6b, 0x8a, 0x9d, 0x05, 0x7f, 0xb8, 0xe0, 0x3f, 0x76, 0x30, 0xed, 0x78, 0xa2,
-	0xf7, 0x1b, 0x86, 0x2e, 0x4b, 0x94, 0xa2, 0x82, 0xbd, 0x43, 0xbd, 0x7a, 0x3b, 0xd4, 0x63, 0xf2,
-	0x02, 0x20, 0x2e, 0xd2, 0x14, 0x63, 0x95, 0x68, 0x17, 0x6f, 0x20, 0x4a, 0x71, 0x6d, 0xe2, 0xda,
-	0xec, 0x76, 0xe8, 0x29, 0xc4, 0xf8, 0x5c, 0xeb, 0x62, 0x03, 0x8c, 0xcf, 0x56, 0x17, 0x13, 0xf2,
-	0x09, 0x90, 0x4a, 0xba, 0xf9, 0xaa, 0x0e, 0xec, 0xea, 0xc0, 0x91, 0xfd, 0xf2, 0x7a, 0x55, 0x45,
-	0x3f, 0x03, 0x8f, 0x23, 0x4d, 0xa2, 0x22, 0x4f, 0x57, 0xda, 0xfa, 0x7e, 0xd8, 0x57, 0xc0, 0x9b,
-	0x3c, 0x5d, 0x91, 0x8f, 0x61, 0x9f, 0x63, 0x99, 0xb2, 0x98, 0x46, 0x65, 0x4a, 0x63, 0xcc, 0x30,
-	0xaf, 0xaa, 0x60, 0x64, 0x3f, 0x5c, 0x54, 0x38, 0xf1, 0xa1, 0x77, 0x8b, 0x5c, 0xa8, 0x63, 0x79,
-	0x3a, 0xa4, 0x9a, 0x92, 0x11, 0xb4, 0xa4, 0x4c, 0x7d, 0xd0, 0xa8, 0x1a, 0x06, 0x3d, 0xe8, 0x9c,
-	0x64, 0xa5, 0x5c, 0x05, 0xbf, 0x3b, 0xf0, 0xe4, 0x72, 0x51, 0x22, 0x7f, 0x9d, 0x16, 0xf1, 0xcd,
-	0xc9, 0x52, 0x72, 0x4a, 0xde, 0xc0, 0x1e, 0x72, 0x2a, 0x16, 0x5c, 0x71, 0x4f, 0x58, 0x7e, 0xad,
-	0x25, 0x1d, 0x1c, 0x4f, 0x1b, 0xc5, 0xb5, 0x95, 0x73, 0x74, 0x62, 0x12, 0x66, 0x3a, 0x3e, 0x1c,
-	0x62, 0x73, 0x3a, 0xfe, 0x09, 0x86, 0x1b, 0xdf, 0x95, 0x31, 0xaa, 0xf0, 0xad, 0x55, 0x7a, 0xac,
-	0x1c, 0x2f, 0x29, 0x67, 0x72, 0x65, 0x1b, 0xd4, 0xce, 0x94, 0x21, 0xb6, 0xff, 0x54, 0x1d, 0xb6,
-	0x74, 0x1d, 0x7a, 0x06, 0x39, 0x4d, 0x44, 0xf0, 0x11, 0x1c, 0xcc, 0x52, 0x86, 0xb9, 0x3c, 0x67,
-	0x42, 0x62, 0x1e, 0xe2, 0x2f, 0x0b, 0x14, 0x52, 0xed, 0x90, 0xd3, 0x0c, 0x6d, 0xfb, 0xeb, 0x71,
-	0xf0, 0x2b, 0xec, 0x99, 0xd2, 0x39, 0x2f, 0x62, 0x5d, 0x37, 0x4a, 0x18, 0xd5, 0xf7, 0x26, 0x48,
-	0x0d, 0xb7, 0x2e, 0x04, 0x77, 0xfb, 0x42, 0x68, 0x76, 0x4c, 0xeb, 0xdf, 0x3b, 0xa6, 0x7d, 0xbf,
-	0x63, 0x7e, 0x80, 0x83, 0xf3, 0xa2, 0xb8, 0x59, 0x94, 0x86, 0x46, 0xc5, 0x75, 0xf3, 0x84, 0xce,
-	0xa4, 0xa5, 0xf6, 0xac, 0x4f, 0xb8, 0x55, 0xb1, 0xee, 0x76, 0xc5, 0x06, 0x7f, 0x3b, 0x70, 0xb8,
-	0xb9, 0xac, 0xed, 0xc5, 0x9f, 0xe1, 0xa0, 0x5e, 0x37, 0x4a, 0xed, 0x99, 0xcd, 0x06, 0x83, 0xe3,
-	0x57, 0x0d, 0x33, 0x1f, 0xca, 0xae, 0xae, 0x8f, 0xa4, 0x12, 0x2b, 0xdc, 0xbf, 0xdd, 0x42, 0xc4,
-	0x78, 0x09, 0xa3, 0xed, 0x30, 0x55, 0xd0, 0xf5, 0xae, 0x56, 0xd9, 0x7e, 0x95, 0x49, 0x3e, 0x05,
-	0x6f, 0x4d, 0xc4, 0xd5, 0x44, 0x0e, 0x36, 0x88, 0xd8, 0xbd, 0xd6, 0x51, 0xe4, 0x10, 0x3a, 0xc8,
-	0x79, 0x51, 0x5d, 0x04, 0x66, 0x12, 0x7c, 0x0e, 0xfd, 0xff, 0xec, 0x62, 0xf0, 0xa7, 0x03, 0xc3,
-	0xaf, 0x84, 0x60, 0xd7, 0x75, 0xb9, 0x1c, 0x42, 0xc7, 0xb4, 0xa9, 0xb9, 0xac, 0xcc, 0x84, 0x4c,
-	0x60, 0x60, 0xbb, 0xac, 0x21, 0x7d, 0x13, 0x7a, 0xef, 0x6d, 0x62, 0x3b, 0xaf, 0x6d, 0xa8, 0x49,
-	0x99, 0x6e, 0x3f, 0x03, 0x9d, 0x47, 0x9f, 0x81, 0x6e, 0xe3, 0x19, 0x78, 0x06, 0x9e, 0x4e, 0xca,
-	0x8b, 0x04, 0xed, 0xfb, 0xd0, 0x57, 0xc0, 0x77, 0x45, 0xa2, 0xcb, 0xba, 0x3a, 0x8c, 0x35, 0x7e,
-	0x04, 0xad, 0xab, 0x5a, 0x7c, 0x35, 0xac, 0x24, 0x72, 0x1f, 0x93, 0xe8, 0xde, 0xcb, 0x57, 0x0b,
-	0xd2, 0x6e, 0x0a, 0x52, 0x7b, 0xd1, 0x69, 0x78, 0x71, 0xfc, 0x9b, 0x0b, 0xbd, 0x4b, 0xa4, 0x77,
-	0x88, 0x09, 0x39, 0x85, 0xe1, 0x25, 0xe6, 0xc9, 0xfa, 0x15, 0x3e, 0x6c, 0xd8, 0x5b, 0xa3, 0xe3,
-	0xe7, 0x0f, 0xa1, 0x15, 0xff, 0x60, 0x67, 0xea, 0xbc, 0x72, 0xc8, 0x05, 0x0c, 0xcf, 0x10, 0xcb,
-	0x59, 0x91, 0xe7, 0x18, 0x4b, 0x4c, 0xc8, 0x8b, 0x46, 0xd2, 0x03, 0x3d, 0x3f, 0x7e, 0x7a, 0xef,
-	0xf1, 0xab, 0x4a, 0xc4, 0xae, 0xf8, 0x3d, 0xec, 0x36, 0x4b, 0x7d, 0x63, 0xc1, 0x07, 0x1a, 0x73,
-	0xfc, 0xf2, 0x3d, 0x3d, 0x12, 0xec, 0x90, 0x2f, 0xa1, 0x6b, 0xc4, 0x27, 0x7e, 0x23, 0x78, 0xa3,
-	0xb8, 0x36, 0x78, 0x6d, 0x3a, 0x15, 0xec, 0xcc, 0xbb, 0xfa, 0x2f, 0xe6, 0xb3, 0x7f, 0x02, 0x00,
-	0x00, 0xff, 0xff, 0xbc, 0xef, 0x85, 0x4d, 0xd5, 0x08, 0x00, 0x00,
+	// 1055 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xb4, 0x56, 0x4b, 0x6f, 0xe4, 0x44,
+	0x10, 0x5e, 0x7b, 0x9e, 0xae, 0xd9, 0xc9, 0x4e, 0x3a, 0x11, 0xf2, 0xce, 0xbe, 0x06, 0x73, 0x19,
+	0x04, 0x8a, 0x96, 0x70, 0x44, 0x08, 0xb1, 0xd1, 0x22, 0xa2, 0x04, 0x36, 0x38, 0xb0, 0x07, 0x2e,
+	0xa6, 0x63, 0x57, 0xa2, 0x56, 0xfc, 0xa2, 0xbb, 0x27, 0x99, 0xd9, 0x0b, 0x47, 0xfe, 0x15, 0x17,
+	0xb8, 0xf1, 0x53, 0xb8, 0xf1, 0x0b, 0x50, 0x3f, 0xec, 0xf1, 0x38, 0x09, 0x91, 0x90, 0xb8, 0xb5,
+	0xbf, 0xae, 0xee, 0xaa, 0xfe, 0xbe, 0x7a, 0x18, 0x1e, 0x66, 0x54, 0x48, 0xe4, 0x7b, 0x25, 0x2f,
+	0x64, 0x41, 0x3c, 0xf3, 0x15, 0x95, 0x67, 0xc1, 0x5f, 0x2e, 0x78, 0x5f, 0x23, 0xe5, 0xf2, 0x0c,
+	0xa9, 0x24, 0x5b, 0xe0, 0xb2, 0xd2, 0x77, 0x66, 0xce, 0xdc, 0x0b, 0x5d, 0x56, 0x12, 0x02, 0xdd,
+	0xb2, 0xe0, 0xd2, 0x77, 0x67, 0xce, 0x7c, 0x1c, 0xea, 0x35, 0x79, 0x06, 0x50, 0x2e, 0xce, 0x52,
+	0x16, 0x47, 0x0b, 0x9e, 0xfa, 0x1d, 0x6d, 0xeb, 0x19, 0xe4, 0x07, 0x9e, 0x92, 0x39, 0x4c, 0x32,
+	0xba, 0x8c, 0xae, 0x8a, 0x74, 0x91, 0x61, 0x14, 0x17, 0x8b, 0x5c, 0xfa, 0x5d, 0x7d, 0x7c, 0x2b,
+	0xa3, 0xcb, 0xb7, 0x1a, 0x3e, 0x50, 0x28, 0x99, 0xa9, 0xa8, 0x96, 0xd1, 0x39, 0x4b, 0x31, 0xba,
+	0xc4, 0x95, 0xdf, 0x9b, 0x39, 0xf3, 0x6e, 0x08, 0x19, 0x5d, 0x7e, 0xc5, 0x52, 0x3c, 0xc2, 0x15,
+	0x79, 0x01, 0xa3, 0x84, 0x4a, 0x1a, 0xc5, 0x98, 0x4b, 0xe4, 0x7e, 0x5f, 0xfb, 0x02, 0x05, 0x1d,
+	0x68, 0x44, 0xc5, 0xc7, 0x69, 0x7c, 0xe9, 0x0f, 0xf4, 0x8e, 0x5e, 0xab, 0xf8, 0x68, 0x92, 0xb1,
+	0x3c, 0xd2, 0x91, 0x0f, 0xb5, 0x6b, 0x4f, 0x23, 0x27, 0x2a, 0xfc, 0xcf, 0x61, 0x60, 0x62, 0x13,
+	0xbe, 0x37, 0xeb, 0xcc, 0x47, 0xfb, 0x1f, 0xec, 0xd5, 0x6c, 0xec, 0x99, 0xf0, 0x0e, 0xf3, 0xf3,
+	0x82, 0x67, 0x54, 0xb2, 0x22, 0xff, 0x06, 0x85, 0xa0, 0x17, 0x18, 0x56, 0x67, 0xc8, 0x63, 0x18,
+	0xe6, 0x78, 0x1d, 0x5d, 0xb1, 0x44, 0xf8, 0x30, 0xeb, 0xcc, 0xc7, 0xe1, 0x20, 0xc7, 0xeb, 0xb7,
+	0x2c, 0x11, 0xe4, 0x7d, 0x78, 0x98, 0x60, 0x8a, 0x12, 0x13, 0xb3, 0x3d, 0xd2, 0xdb, 0x23, 0x8b,
+	0x29, 0x93, 0x40, 0xc0, 0x76, 0x4d, 0x76, 0x88, 0xa2, 0x2c, 0x72, 0x81, 0x64, 0x0e, 0x8f, 0xcc,
+	0xed, 0xa7, 0xec, 0x1d, 0x1e, 0xb3, 0x8c, 0x49, 0xad, 0x40, 0x37, 0x6c, 0xc3, 0xe4, 0x29, 0x78,
+	0x02, 0x63, 0x8e, 0xf2, 0x08, 0x57, 0x5a, 0x13, 0x2f, 0x5c, 0x03, 0xe4, 0x3d, 0xe8, 0xa7, 0x48,
+	0x13, 0xe4, 0x56, 0x14, 0xfb, 0x15, 0xfc, 0xe1, 0x82, 0x7f, 0xd7, 0xc3, 0xb4, 0xe2, 0x89, 0xf6,
+	0x37, 0x0e, 0x5d, 0x96, 0x28, 0x46, 0x05, 0x7b, 0x87, 0xfa, 0xf6, 0x6e, 0xa8, 0xd7, 0xe4, 0x39,
+	0x40, 0x5c, 0xa4, 0x29, 0xc6, 0xea, 0xa0, 0xbd, 0xbc, 0x81, 0x28, 0xc6, 0xb5, 0x88, 0x6b, 0xb1,
+	0xbb, 0xa1, 0xa7, 0x10, 0xa3, 0x73, 0xcd, 0x8b, 0x35, 0x30, 0x3a, 0x5b, 0x5e, 0x8c, 0xc9, 0xc7,
+	0x40, 0x2a, 0xea, 0xce, 0x56, 0xb5, 0x61, 0x5f, 0x1b, 0x4e, 0xec, 0xce, 0xab, 0x55, 0x65, 0xfd,
+	0x04, 0x3c, 0x8e, 0x34, 0x89, 0x8a, 0x3c, 0x5d, 0x69, 0xe9, 0x87, 0xe1, 0x50, 0x01, 0x6f, 0xf2,
+	0x74, 0x45, 0x3e, 0x82, 0x6d, 0x8e, 0x65, 0xca, 0x62, 0x1a, 0x95, 0x29, 0x8d, 0x31, 0xc3, 0xbc,
+	0xca, 0x82, 0x89, 0xdd, 0x38, 0xa9, 0x70, 0xe2, 0xc3, 0xe0, 0x0a, 0xb9, 0x50, 0xcf, 0xf2, 0xb4,
+	0x49, 0xf5, 0x49, 0x26, 0xd0, 0x91, 0x32, 0xf5, 0x41, 0xa3, 0x6a, 0x19, 0x0c, 0xa0, 0xf7, 0x3a,
+	0x2b, 0xe5, 0x2a, 0xf8, 0xcd, 0x81, 0x47, 0xa7, 0x8b, 0x12, 0xf9, 0xab, 0xb4, 0x88, 0x2f, 0x5f,
+	0x2f, 0x25, 0xa7, 0xe4, 0x0d, 0x6c, 0x21, 0xa7, 0x62, 0xc1, 0x55, 0xec, 0x09, 0xcb, 0x2f, 0x34,
+	0xa5, 0xa3, 0xfd, 0x79, 0x23, 0xb9, 0x5a, 0x67, 0xf6, 0x5e, 0x9b, 0x03, 0x07, 0xda, 0x3e, 0x1c,
+	0x63, 0xf3, 0x73, 0xfa, 0x23, 0x8c, 0x37, 0xf6, 0x95, 0x30, 0x2a, 0xf1, 0xad, 0x54, 0x7a, 0xad,
+	0x14, 0x2f, 0x29, 0x67, 0x72, 0x65, 0x0b, 0xd4, 0x7e, 0x29, 0x41, 0x6c, 0xfd, 0xa9, 0x3c, 0xec,
+	0xe8, 0x3c, 0xf4, 0x0c, 0x72, 0x98, 0x88, 0xe0, 0x43, 0xd8, 0x39, 0x48, 0x19, 0xe6, 0xf2, 0x98,
+	0x09, 0x89, 0x79, 0x88, 0x3f, 0x2f, 0x50, 0x48, 0xe5, 0x21, 0xa7, 0x19, 0xda, 0xf2, 0xd7, 0xeb,
+	0xe0, 0x17, 0xd8, 0x32, 0xa9, 0x73, 0x5c, 0xc4, 0x3a, 0x6f, 0x14, 0x31, 0xaa, 0xee, 0x8d, 0x91,
+	0x5a, 0xb6, 0x1a, 0x82, 0xdb, 0x6e, 0x08, 0xcd, 0x8a, 0xe9, 0xfc, 0x7b, 0xc5, 0x74, 0x6f, 0x56,
+	0xcc, 0xf7, 0xb0, 0x73, 0x5c, 0x14, 0x97, 0x8b, 0xd2, 0x84, 0x51, 0xc5, 0xba, 0xf9, 0x42, 0x67,
+	0xd6, 0x51, 0x3e, 0xeb, 0x17, 0xb6, 0x32, 0xd6, 0x6d, 0x67, 0x6c, 0xf0, 0xb7, 0x03, 0xbb, 0x9b,
+	0xd7, 0xda, 0x5a, 0xfc, 0x09, 0x76, 0xea, 0x7b, 0xa3, 0xd4, 0xbe, 0xd9, 0x38, 0x18, 0xed, 0xbf,
+	0x6c, 0x88, 0x79, 0xdb, 0xe9, 0xaa, 0x7d, 0x24, 0x15, 0x59, 0xe1, 0xf6, 0x55, 0x0b, 0x11, 0xd3,
+	0x25, 0x4c, 0xda, 0x66, 0x2a, 0xa1, 0x6b, 0xaf, 0x96, 0xd9, 0x61, 0x75, 0x92, 0x7c, 0x02, 0xde,
+	0x3a, 0x10, 0x57, 0x07, 0xb2, 0xb3, 0x11, 0x88, 0xf5, 0xb5, 0xb6, 0x22, 0xbb, 0xd0, 0x43, 0xce,
+	0x8b, 0xaa, 0x11, 0x98, 0x8f, 0xe0, 0x33, 0x18, 0xfe, 0x67, 0x15, 0x83, 0x3f, 0x1d, 0x18, 0x7f,
+	0x29, 0x04, 0xbb, 0xa8, 0xd3, 0x65, 0x17, 0x7a, 0xa6, 0x4c, 0x4d, 0xb3, 0x32, 0x1f, 0x64, 0x06,
+	0x23, 0x5b, 0x65, 0x0d, 0xea, 0x9b, 0xd0, 0xbd, 0xdd, 0xc4, 0x56, 0x5e, 0xd7, 0x84, 0x26, 0x65,
+	0xda, 0x1e, 0x03, 0xbd, 0x3b, 0xc7, 0x40, 0xbf, 0x31, 0x06, 0x9e, 0x80, 0xa7, 0x0f, 0xe5, 0x45,
+	0x82, 0x76, 0x3e, 0x0c, 0x15, 0xf0, 0x6d, 0x91, 0xe8, 0xb4, 0xae, 0x1e, 0x63, 0x85, 0x9f, 0x40,
+	0xe7, 0xbc, 0x26, 0x5f, 0x2d, 0x2b, 0x8a, 0xdc, 0xbb, 0x28, 0xba, 0x31, 0xf9, 0x6a, 0x42, 0xba,
+	0x4d, 0x42, 0x6a, 0x2d, 0x7a, 0x4d, 0x2d, 0x2e, 0x60, 0xfb, 0x54, 0x52, 0xc9, 0x84, 0x64, 0xb1,
+	0xa8, 0x18, 0x6d, 0x71, 0xe7, 0xdc, 0xc7, 0x9d, 0x7b, 0x17, 0x77, 0x9d, 0x9a, 0xbb, 0xe0, 0x77,
+	0x07, 0x48, 0xd3, 0x93, 0x7d, 0xee, 0xff, 0xe0, 0x4a, 0xd1, 0x23, 0x0b, 0x49, 0xd3, 0x48, 0x0f,
+	0x10, 0x3b, 0x06, 0x34, 0xa2, 0x26, 0x98, 0x12, 0x64, 0x21, 0x30, 0x31, 0xbb, 0x66, 0x06, 0x0c,
+	0x15, 0xa0, 0x37, 0x37, 0x47, 0x48, 0xbf, 0x35, 0x42, 0xf6, 0x7f, 0xed, 0xc0, 0xe0, 0x14, 0xe9,
+	0x35, 0x62, 0x42, 0x0e, 0x61, 0x7c, 0x8a, 0x79, 0xb2, 0xfe, 0x69, 0xd9, 0x6d, 0x54, 0x43, 0x8d,
+	0x4e, 0x9f, 0xde, 0x86, 0x56, 0xef, 0x0f, 0x1e, 0xcc, 0x9d, 0x97, 0x0e, 0x39, 0x81, 0xf1, 0x11,
+	0x62, 0x79, 0x50, 0xe4, 0x39, 0xc6, 0x12, 0x13, 0xf2, 0xbc, 0x71, 0xe8, 0x96, 0x16, 0x39, 0x7d,
+	0x7c, 0xe3, 0x5f, 0xa1, 0xaa, 0x28, 0x7b, 0xe3, 0x77, 0xf0, 0xb0, 0xd9, 0x19, 0x36, 0x2e, 0xbc,
+	0xa5, 0x8f, 0x4d, 0x5f, 0xdc, 0xd3, 0x52, 0x82, 0x07, 0xe4, 0x0b, 0xe8, 0x9b, 0x5c, 0x25, 0x7e,
+	0xc3, 0x78, 0xa3, 0x16, 0x37, 0xe2, 0xda, 0x4c, 0xec, 0xe0, 0x01, 0x39, 0x02, 0x58, 0x67, 0x00,
+	0x69, 0xf2, 0x72, 0x23, 0x05, 0xa7, 0xcf, 0xee, 0xd8, 0xad, 0x2e, 0x3b, 0xeb, 0xeb, 0x3f, 0xc8,
+	0x4f, 0xff, 0x09, 0x00, 0x00, 0xff, 0xff, 0xc7, 0x9f, 0x0a, 0x25, 0x51, 0x0a, 0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 72d5b2e1d..3993bcf07 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/filer2"
@@ -12,8 +14,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"strconv"
-	"strings"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 )
 
 func (fs *FilerServer) LookupDirectoryEntry(ctx context.Context, req *filer_pb.LookupDirectoryEntryRequest) (*filer_pb.LookupDirectoryEntryResponse, error) {
@@ -233,3 +234,23 @@ func (fs *FilerServer) DeleteCollection(ctx context.Context, req *filer_pb.Delet
 
 	return &filer_pb.DeleteCollectionResponse{}, err
 }
+
+func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsRequest) (resp *filer_pb.StatisticsResponse, err error) {
+
+	input := &master_pb.StatisticsRequest{
+		Replication: req.Replication,
+		Collection:  req.Collection,
+		Ttl:         req.Ttl,
+	}
+
+	output, err := operation.Statistics(fs.filer.GetMaster(), input)
+	if err != nil {
+		return nil, err
+	}
+
+	return &filer_pb.StatisticsResponse{
+		TotalSize: output.TotalSize,
+		UsedSize:  output.UsedSize,
+		FileCount: output.FileCount,
+	}, nil
+}
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index 26dec1577..76d659009 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -84,3 +84,29 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 		Count:     count,
 	}, nil
 }
+
+func (ms *MasterServer) Statistics(ctx context.Context, req *master_pb.StatisticsRequest) (*master_pb.StatisticsResponse, error) {
+
+	if req.Replication == "" {
+		req.Replication = ms.defaultReplicaPlacement
+	}
+	replicaPlacement, err := storage.NewReplicaPlacementFromString(req.Replication)
+	if err != nil {
+		return nil, err
+	}
+	ttl, err := storage.ReadTTL(req.Ttl)
+	if err != nil {
+		return nil, err
+	}
+
+	volumeLayout := ms.Topo.GetVolumeLayout(req.Collection, replicaPlacement, ttl)
+	stats := volumeLayout.Stats()
+
+	resp := &master_pb.StatisticsResponse{
+		TotalSize: stats.TotalSize,
+		UsedSize:  stats.UsedSize,
+		FileCount: stats.FileCount,
+	}
+
+	return resp, nil
+}
diff --git a/weed/topology/volume_layout.go b/weed/topology/volume_layout.go
index 8c0a75140..b6044e29f 100644
--- a/weed/topology/volume_layout.go
+++ b/weed/topology/volume_layout.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math/rand"
 	"sync"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/storage"
@@ -22,6 +23,12 @@ type VolumeLayout struct {
 	accessLock       sync.RWMutex
 }
 
+type VolumeLayoutStats struct {
+	TotalSize uint64
+	UsedSize  uint64
+	FileCount uint64
+}
+
 func NewVolumeLayout(rp *storage.ReplicaPlacement, ttl *storage.TTL, volumeSizeLimit uint64) *VolumeLayout {
 	return &VolumeLayout{
 		rp:               rp,
@@ -265,3 +272,25 @@ func (vl *VolumeLayout) ToMap() map[string]interface{} {
 	//m["locations"] = vl.vid2location
 	return m
 }
+
+func (vl *VolumeLayout) Stats() *VolumeLayoutStats {
+	vl.accessLock.RLock()
+	defer vl.accessLock.RUnlock()
+
+	ret := &VolumeLayoutStats{}
+
+	freshThreshold := time.Now().Unix() - 60
+
+	for vid, vll := range vl.vid2location {
+		size, fileCount := vll.Stats(vid, freshThreshold)
+		ret.FileCount += uint64(fileCount)
+		ret.UsedSize += size
+		if vl.readonlyVolumes[vid] {
+			ret.TotalSize += size
+		} else {
+			ret.TotalSize += vl.volumeSizeLimit
+		}
+	}
+
+	return ret
+}
diff --git a/weed/topology/volume_location_list.go b/weed/topology/volume_location_list.go
index d5eaf5e92..8d5881333 100644
--- a/weed/topology/volume_location_list.go
+++ b/weed/topology/volume_location_list.go
@@ -2,6 +2,8 @@ package topology
 
 import (
 	"fmt"
+
+	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
 type VolumeLocationList struct {
@@ -63,3 +65,15 @@ func (dnll *VolumeLocationList) Refresh(freshThreshHold int64) {
 		dnll.list = l
 	}
 }
+
+func (dnll *VolumeLocationList) Stats(vid storage.VolumeId, freshThreshHold int64) (size uint64, fileCount int) {
+	for _, dnl := range dnll.list {
+		if dnl.LastSeen < freshThreshHold {
+			vinfo, err := dnl.GetVolumesById(vid)
+			if err == nil {
+				return vinfo.Size - vinfo.DeletedByteCount, vinfo.FileCount - vinfo.DeleteCount
+			}
+		}
+	}
+	return 0, 0
+}