file handler directly read from volume servers

this mostly works fine now!

next: need to cache files to local disk

7 files changed, 383 insertions, 168 deletions

diff --git a/weed/filer2/filechunks.go b/weed/filer2/filechunks.go
index 93cee81de..6bdfbd48e 100644
--- a/weed/filer2/filechunks.go
+++ b/weed/filer2/filechunks.go
@@ -52,7 +52,14 @@ func FindUnusedFileChunks(oldChunks, newChunks []*filer_pb.FileChunk) (unused []
 	return
 }
 
-func ReadFromChunks(chunks []*filer_pb.FileChunk, offset int64, size int) (views []*filer_pb.FileChunk) {
+type ChunkView struct {
+	FileId      string
+	Offset      int64
+	Size        uint64
+	LogicOffset int64
+}
+
+func ReadFromChunks(chunks []*filer_pb.FileChunk, offset int64, size int) (views []*ChunkView) {
 
 	visibles := nonOverlappingVisibleIntervals(chunks)
 
@@ -60,10 +67,11 @@ func ReadFromChunks(chunks []*filer_pb.FileChunk, offset int64, size int) (views
 
 	for _, chunk := range visibles {
 		if chunk.start <= offset && offset < chunk.stop {
-			views = append(views, &filer_pb.FileChunk{
-				FileId: chunk.fileId,
-				Offset: offset - chunk.start, // offset is the data starting location in this file id
-				Size:   uint64(min(chunk.stop, stop) - offset),
+			views = append(views, &ChunkView{
+				FileId:      chunk.fileId,
+				Offset:      offset - chunk.start, // offset is the data starting location in this file id
+				Size:        uint64(min(chunk.stop, stop) - offset),
+				LogicOffset: offset,
 			})
 			offset = min(chunk.stop, stop)
 		}
diff --git a/weed/filer2/filechunks_test.go b/weed/filer2/filechunks_test.go
index 9e39477be..24897215e 100644
--- a/weed/filer2/filechunks_test.go
+++ b/weed/filer2/filechunks_test.go
@@ -151,7 +151,7 @@ func TestChunksReading(t *testing.T) {
 		Chunks   []*filer_pb.FileChunk
 		Offset   int64
 		Size     int
-		Expected []*filer_pb.FileChunk
+		Expected []*ChunkView
 	}{
 		// case 0: normal
 		{
@@ -162,10 +162,10 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 0,
 			Size:   250,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 0, Size: 100, FileId: "abc"},
-				{Offset: 0, Size: 100, FileId: "asdf"},
-				{Offset: 0, Size: 50, FileId: "fsad"},
+			Expected: []*ChunkView{
+				{Offset: 0, Size: 100, FileId: "abc", LogicOffset:0},
+				{Offset: 0, Size: 100, FileId: "asdf", LogicOffset:100},
+				{Offset: 0, Size: 50, FileId: "fsad", LogicOffset:200},
 			},
 		},
 		// case 1: updates overwrite full chunks
@@ -176,8 +176,8 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 50,
 			Size:   100,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 50, Size: 100, FileId: "asdf"},
+			Expected: []*ChunkView{
+				{Offset: 50, Size: 100, FileId: "asdf", LogicOffset:50},
 			},
 		},
 		// case 2: updates overwrite part of previous chunks
@@ -188,9 +188,9 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 25,
 			Size:   50,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 25, Size: 25, FileId: "asdf"},
-				{Offset: 0, Size: 25, FileId: "abc"},
+			Expected: []*ChunkView{
+				{Offset: 25, Size: 25, FileId: "asdf", LogicOffset:25},
+				{Offset: 0, Size: 25, FileId: "abc", LogicOffset:50},
 			},
 		},
 		// case 3: updates overwrite full chunks
@@ -202,9 +202,9 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 0,
 			Size:   200,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 0, Size: 50, FileId: "asdf"},
-				{Offset: 0, Size: 150, FileId: "xxxx"},
+			Expected: []*ChunkView{
+				{Offset: 0, Size: 50, FileId: "asdf", LogicOffset:0},
+				{Offset: 0, Size: 150, FileId: "xxxx", LogicOffset:50},
 			},
 		},
 		// case 4: updates far away from prev chunks
@@ -216,8 +216,8 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 0,
 			Size:   400,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 0, Size: 200, FileId: "asdf"},
+			Expected: []*ChunkView{
+				{Offset: 0, Size: 200, FileId: "asdf", LogicOffset:0},
 				// {Offset: 0, Size: 150, FileId: "xxxx"}, // missing intervals should not happen
 			},
 		},
@@ -231,9 +231,9 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 0,
 			Size:   220,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 0, Size: 200, FileId: "asdf"},
-				{Offset: 0, Size: 20, FileId: "abc"},
+			Expected: []*ChunkView{
+				{Offset: 0, Size: 200, FileId: "asdf", LogicOffset:0},
+				{Offset: 0, Size: 20, FileId: "abc", LogicOffset:200},
 			},
 		},
 		// case 6: same updates
@@ -245,8 +245,8 @@ func TestChunksReading(t *testing.T) {
 			},
 			Offset: 0,
 			Size:   100,
-			Expected: []*filer_pb.FileChunk{
-				{Offset: 0, Size: 100, FileId: "abc"},
+			Expected: []*ChunkView{
+				{Offset: 0, Size: 100, FileId: "abc", LogicOffset:0},
 			},
 		},
 	}
@@ -269,6 +269,10 @@ func TestChunksReading(t *testing.T) {
 				t.Fatalf("failed on read case %d, chunk %d, FileId %s, expect %s",
 					i, x, chunk.FileId, testcase.Expected[x].FileId)
 			}
+			if chunk.LogicOffset != testcase.Expected[x].LogicOffset {
+				t.Fatalf("failed on read case %d, chunk %d, LogicOffset %d, expect %d",
+					i, x, chunk.LogicOffset, testcase.Expected[x].LogicOffset)
+			}
 		}
 		if len(chunks) != len(testcase.Expected) {
 			t.Fatalf("failed to read test case %d, len %d expected %d", i, len(chunks), len(testcase.Expected))
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index 55d574342..c71f1ee36 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -11,6 +11,9 @@ import (
 	"bytes"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"time"
+	"strings"
+	"sync"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 type FileHandle struct {
@@ -33,46 +36,94 @@ type FileHandle struct {
 }
 
 var _ = fs.Handle(&FileHandle{})
-var _ = fs.HandleReadAller(&FileHandle{})
-// var _ = fs.HandleReader(&FileHandle{})
+// var _ = fs.HandleReadAller(&FileHandle{})
+var _ = fs.HandleReader(&FileHandle{})
 var _ = fs.HandleFlusher(&FileHandle{})
 var _ = fs.HandleWriter(&FileHandle{})
 var _ = fs.HandleReleaser(&FileHandle{})
 
-func (fh *FileHandle) ReadAll(ctx context.Context) (content []byte, err error) {
+func (fh *FileHandle) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
 
-	glog.V(3).Infof("%v/%v read all fh ", fh.dirPath, fh.name)
+	glog.V(3).Infof("%v/%v read fh: [%d,%d)", fh.dirPath, fh.name, req.Offset, req.Offset+int64(req.Size))
 
 	if len(fh.Chunks) == 0 {
 		glog.V(0).Infof("empty fh %v/%v", fh.dirPath, fh.name)
-		return
+		return fmt.Errorf("empty file %v/%v", fh.dirPath, fh.name)
 	}
 
-	err = fh.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+	buff := make([]byte, req.Size)
 
-		// FIXME: need to either use Read() or implement differently
-		chunks, _ := filer2.CompactFileChunks(fh.Chunks)
-		glog.V(1).Infof("read fh %v/%v %d/%d chunks", fh.dirPath, fh.name, len(chunks), len(fh.Chunks))
-		for i, chunk := range chunks {
-			glog.V(1).Infof("read fh %v/%v %d/%d chunk %s [%d,%d)", fh.dirPath, fh.name, i, len(chunks), chunk.FileId, chunk.Offset, chunk.Offset+int64(chunk.Size))
-		}
-		request := &filer_pb.GetFileContentRequest{
-			FileId: chunks[0].FileId,
-		}
+	chunkViews := filer2.ReadFromChunks(fh.Chunks, req.Offset, req.Size)
+
+	var vids []string
+	for _, chunkView := range chunkViews {
+		vids = append(vids, volumeId(chunkView.FileId))
+	}
+
+	vid2Locations := make(map[string]*filer_pb.Locations)
+
+	err := fh.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
-		glog.V(1).Infof("read fh content %d chunk %s [%d,%d): %v", len(chunks),
-			chunks[0].FileId, chunks[0].Offset, chunks[0].Offset+int64(chunks[0].Size), request)
-		resp, err := client.GetFileContent(ctx, request)
+		glog.V(4).Infof("read fh lookup volume id locations: %v", vids)
+		resp, err := client.LookupVolume(ctx, &filer_pb.LookupVolumeRequest{
+			VolumeIds: vids,
+		})
 		if err != nil {
 			return err
 		}
 
-		content = resp.Content
+		vid2Locations = resp.LocationsMap
 
 		return nil
 	})
 
-	return content, err
+	if err != nil {
+		glog.V(3).Infof("%v/%v read fh lookup volume ids: %v", fh.dirPath, fh.name, err)
+		return fmt.Errorf("failed to lookup volume ids %v: %v", vids, err)
+	}
+
+	var totalRead int64
+	var wg sync.WaitGroup
+	for _, chunkView := range chunkViews {
+		wg.Add(1)
+		go func(chunkView *filer2.ChunkView) {
+			defer wg.Done()
+
+			glog.V(3).Infof("read fh reading chunk: %+v", chunkView)
+
+			locations := vid2Locations[volumeId(chunkView.FileId)]
+			if locations == nil || len(locations.Locations) == 0 {
+				glog.V(0).Infof("failed to locate %s", chunkView.FileId)
+				err = fmt.Errorf("failed to locate %s", chunkView.FileId)
+				return
+			}
+
+			var n int64
+			n, err = util.ReadUrl(
+				fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, chunkView.FileId),
+				chunkView.Offset,
+				int(chunkView.Size),
+				buff[chunkView.LogicOffset-req.Offset:chunkView.LogicOffset-req.Offset+int64(chunkView.Size)])
+
+			if err != nil {
+
+				glog.V(0).Infof("%v/%v read http://%s/%v %v bytes: %v", fh.dirPath, fh.name, locations.Locations[0].Url, chunkView.FileId, n, err)
+
+				err = fmt.Errorf("failed to read http://%s/%s: %v",
+					locations.Locations[0].Url, chunkView.FileId, err)
+				return
+			}
+
+			glog.V(3).Infof("read fh read %d bytes: %+v", n, chunkView)
+			totalRead += n
+
+		}(chunkView)
+	}
+	wg.Wait()
+
+	resp.Data = buff[:totalRead]
+
+	return err
 }
 
 // Write to the file handle
@@ -179,3 +230,11 @@ func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error {
 
 	return err
 }
+
+func volumeId(fileId string) string {
+	lastCommaIndex := strings.LastIndex(fileId, ",")
+	if lastCommaIndex > 0 {
+		return fileId[:lastCommaIndex]
+	}
+	return fileId
+}
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index b9c3e87f7..455de81d7 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -15,9 +15,6 @@ service SeaweedFiler {
     rpc GetEntryAttributes (GetEntryAttributesRequest) returns (GetEntryAttributesResponse) {
     }
 
-    rpc GetFileContent (GetFileContentRequest) returns (GetFileContentResponse) {
-    }
-
     rpc CreateEntry (CreateEntryRequest) returns (CreateEntryResponse) {
     }
 
@@ -30,6 +27,9 @@ service SeaweedFiler {
     rpc AssignVolume (AssignVolumeRequest) returns (AssignVolumeResponse) {
     }
 
+    rpc LookupVolume (LookupVolumeRequest) returns (LookupVolumeResponse) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -100,6 +100,13 @@ message CreateEntryRequest {
 message CreateEntryResponse {
 }
 
+message UpdateEntryRequest {
+    string directory = 1;
+    Entry entry = 2;
+}
+message UpdateEntryResponse {
+}
+
 message DeleteEntryRequest {
     string directory = 1;
     string name = 2;
@@ -122,9 +129,18 @@ message AssignVolumeResponse {
     int32 count = 4;
 }
 
-message UpdateEntryRequest {
-    string directory = 1;
-    Entry entry = 2;
+message LookupVolumeRequest {
+    repeated string volume_ids = 1;
 }
-message UpdateEntryResponse {
+
+message Locations {
+    repeated Location locations = 1;
+}
+
+message Location {
+    string url = 1;
+    string public_url = 2;
+}
+message LookupVolumeResponse {
+    map<string, Locations> locations_map = 1;
 }
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index b1f0a3e0d..fb0388307 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -22,12 +22,16 @@ It has these top-level messages:
 	GetFileContentResponse
 	CreateEntryRequest
 	CreateEntryResponse
+	UpdateEntryRequest
+	UpdateEntryResponse
 	DeleteEntryRequest
 	DeleteEntryResponse
 	AssignVolumeRequest
 	AssignVolumeResponse
-	UpdateEntryRequest
-	UpdateEntryResponse
+	LookupVolumeRequest
+	Locations
+	Location
+	LookupVolumeResponse
 */
 package filer_pb
 
@@ -371,6 +375,38 @@ func (m *CreateEntryResponse) String() string            { return proto.CompactT
 func (*CreateEntryResponse) ProtoMessage()               {}
 func (*CreateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{12} }
 
+type UpdateEntryRequest struct {
+	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
+	Entry     *Entry `protobuf:"bytes,2,opt,name=entry" json:"entry,omitempty"`
+}
+
+func (m *UpdateEntryRequest) Reset()                    { *m = UpdateEntryRequest{} }
+func (m *UpdateEntryRequest) String() string            { return proto.CompactTextString(m) }
+func (*UpdateEntryRequest) ProtoMessage()               {}
+func (*UpdateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
+
+func (m *UpdateEntryRequest) GetDirectory() string {
+	if m != nil {
+		return m.Directory
+	}
+	return ""
+}
+
+func (m *UpdateEntryRequest) GetEntry() *Entry {
+	if m != nil {
+		return m.Entry
+	}
+	return nil
+}
+
+type UpdateEntryResponse struct {
+}
+
+func (m *UpdateEntryResponse) Reset()                    { *m = UpdateEntryResponse{} }
+func (m *UpdateEntryResponse) String() string            { return proto.CompactTextString(m) }
+func (*UpdateEntryResponse) ProtoMessage()               {}
+func (*UpdateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+
 type DeleteEntryRequest struct {
 	Directory   string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
 	Name        string `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
@@ -380,7 +416,7 @@ type DeleteEntryRequest struct {
 func (m *DeleteEntryRequest) Reset()                    { *m = DeleteEntryRequest{} }
 func (m *DeleteEntryRequest) String() string            { return proto.CompactTextString(m) }
 func (*DeleteEntryRequest) ProtoMessage()               {}
-func (*DeleteEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
+func (*DeleteEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
 
 func (m *DeleteEntryRequest) GetDirectory() string {
 	if m != nil {
@@ -409,7 +445,7 @@ type DeleteEntryResponse struct {
 func (m *DeleteEntryResponse) Reset()                    { *m = DeleteEntryResponse{} }
 func (m *DeleteEntryResponse) String() string            { return proto.CompactTextString(m) }
 func (*DeleteEntryResponse) ProtoMessage()               {}
-func (*DeleteEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+func (*DeleteEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
 
 type AssignVolumeRequest struct {
 	Count       int32  `protobuf:"varint,1,opt,name=count" json:"count,omitempty"`
@@ -420,7 +456,7 @@ type AssignVolumeRequest struct {
 func (m *AssignVolumeRequest) Reset()                    { *m = AssignVolumeRequest{} }
 func (m *AssignVolumeRequest) String() string            { return proto.CompactTextString(m) }
 func (*AssignVolumeRequest) ProtoMessage()               {}
-func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
+func (*AssignVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
 
 func (m *AssignVolumeRequest) GetCount() int32 {
 	if m != nil {
@@ -453,7 +489,7 @@ type AssignVolumeResponse struct {
 func (m *AssignVolumeResponse) Reset()                    { *m = AssignVolumeResponse{} }
 func (m *AssignVolumeResponse) String() string            { return proto.CompactTextString(m) }
 func (*AssignVolumeResponse) ProtoMessage()               {}
-func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
+func (*AssignVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
 
 func (m *AssignVolumeResponse) GetFileId() string {
 	if m != nil {
@@ -483,37 +519,77 @@ func (m *AssignVolumeResponse) GetCount() int32 {
 	return 0
 }
 
-type UpdateEntryRequest struct {
-	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
-	Entry     *Entry `protobuf:"bytes,2,opt,name=entry" json:"entry,omitempty"`
+type LookupVolumeRequest struct {
+	VolumeIds []string `protobuf:"bytes,1,rep,name=volume_ids,json=volumeIds" json:"volume_ids,omitempty"`
 }
 
-func (m *UpdateEntryRequest) Reset()                    { *m = UpdateEntryRequest{} }
-func (m *UpdateEntryRequest) String() string            { return proto.CompactTextString(m) }
-func (*UpdateEntryRequest) ProtoMessage()               {}
-func (*UpdateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
+func (m *LookupVolumeRequest) Reset()                    { *m = LookupVolumeRequest{} }
+func (m *LookupVolumeRequest) String() string            { return proto.CompactTextString(m) }
+func (*LookupVolumeRequest) ProtoMessage()               {}
+func (*LookupVolumeRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
 
-func (m *UpdateEntryRequest) GetDirectory() string {
+func (m *LookupVolumeRequest) GetVolumeIds() []string {
 	if m != nil {
-		return m.Directory
+		return m.VolumeIds
 	}
-	return ""
+	return nil
 }
 
-func (m *UpdateEntryRequest) GetEntry() *Entry {
+type Locations struct {
+	Locations []*Location `protobuf:"bytes,1,rep,name=locations" json:"locations,omitempty"`
+}
+
+func (m *Locations) Reset()                    { *m = Locations{} }
+func (m *Locations) String() string            { return proto.CompactTextString(m) }
+func (*Locations) ProtoMessage()               {}
+func (*Locations) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
+
+func (m *Locations) GetLocations() []*Location {
 	if m != nil {
-		return m.Entry
+		return m.Locations
 	}
 	return nil
 }
 
-type UpdateEntryResponse struct {
+type Location struct {
+	Url       string `protobuf:"bytes,1,opt,name=url" json:"url,omitempty"`
+	PublicUrl string `protobuf:"bytes,2,opt,name=public_url,json=publicUrl" json:"public_url,omitempty"`
 }
 
-func (m *UpdateEntryResponse) Reset()                    { *m = UpdateEntryResponse{} }
-func (m *UpdateEntryResponse) String() string            { return proto.CompactTextString(m) }
-func (*UpdateEntryResponse) ProtoMessage()               {}
-func (*UpdateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
+func (m *Location) Reset()                    { *m = Location{} }
+func (m *Location) String() string            { return proto.CompactTextString(m) }
+func (*Location) ProtoMessage()               {}
+func (*Location) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
+
+func (m *Location) GetUrl() string {
+	if m != nil {
+		return m.Url
+	}
+	return ""
+}
+
+func (m *Location) GetPublicUrl() string {
+	if m != nil {
+		return m.PublicUrl
+	}
+	return ""
+}
+
+type LookupVolumeResponse struct {
+	LocationsMap map[string]*Locations `protobuf:"bytes,1,rep,name=locations_map,json=locationsMap" json:"locations_map,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
+}
+
+func (m *LookupVolumeResponse) Reset()                    { *m = LookupVolumeResponse{} }
+func (m *LookupVolumeResponse) String() string            { return proto.CompactTextString(m) }
+func (*LookupVolumeResponse) ProtoMessage()               {}
+func (*LookupVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{22} }
+
+func (m *LookupVolumeResponse) GetLocationsMap() map[string]*Locations {
+	if m != nil {
+		return m.LocationsMap
+	}
+	return nil
+}
 
 func init() {
 	proto.RegisterType((*LookupDirectoryEntryRequest)(nil), "filer_pb.LookupDirectoryEntryRequest")
@@ -529,12 +605,16 @@ func init() {
 	proto.RegisterType((*GetFileContentResponse)(nil), "filer_pb.GetFileContentResponse")
 	proto.RegisterType((*CreateEntryRequest)(nil), "filer_pb.CreateEntryRequest")
 	proto.RegisterType((*CreateEntryResponse)(nil), "filer_pb.CreateEntryResponse")
+	proto.RegisterType((*UpdateEntryRequest)(nil), "filer_pb.UpdateEntryRequest")
+	proto.RegisterType((*UpdateEntryResponse)(nil), "filer_pb.UpdateEntryResponse")
 	proto.RegisterType((*DeleteEntryRequest)(nil), "filer_pb.DeleteEntryRequest")
 	proto.RegisterType((*DeleteEntryResponse)(nil), "filer_pb.DeleteEntryResponse")
 	proto.RegisterType((*AssignVolumeRequest)(nil), "filer_pb.AssignVolumeRequest")
 	proto.RegisterType((*AssignVolumeResponse)(nil), "filer_pb.AssignVolumeResponse")
-	proto.RegisterType((*UpdateEntryRequest)(nil), "filer_pb.UpdateEntryRequest")
-	proto.RegisterType((*UpdateEntryResponse)(nil), "filer_pb.UpdateEntryResponse")
+	proto.RegisterType((*LookupVolumeRequest)(nil), "filer_pb.LookupVolumeRequest")
+	proto.RegisterType((*Locations)(nil), "filer_pb.Locations")
+	proto.RegisterType((*Location)(nil), "filer_pb.Location")
+	proto.RegisterType((*LookupVolumeResponse)(nil), "filer_pb.LookupVolumeResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -551,11 +631,11 @@ type SeaweedFilerClient interface {
 	LookupDirectoryEntry(ctx context.Context, in *LookupDirectoryEntryRequest, opts ...grpc.CallOption) (*LookupDirectoryEntryResponse, error)
 	ListEntries(ctx context.Context, in *ListEntriesRequest, opts ...grpc.CallOption) (*ListEntriesResponse, error)
 	GetEntryAttributes(ctx context.Context, in *GetEntryAttributesRequest, opts ...grpc.CallOption) (*GetEntryAttributesResponse, error)
-	GetFileContent(ctx context.Context, in *GetFileContentRequest, opts ...grpc.CallOption) (*GetFileContentResponse, error)
 	CreateEntry(ctx context.Context, in *CreateEntryRequest, opts ...grpc.CallOption) (*CreateEntryResponse, error)
 	UpdateEntry(ctx context.Context, in *UpdateEntryRequest, opts ...grpc.CallOption) (*UpdateEntryResponse, error)
 	DeleteEntry(ctx context.Context, in *DeleteEntryRequest, opts ...grpc.CallOption) (*DeleteEntryResponse, error)
 	AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error)
+	LookupVolume(ctx context.Context, in *LookupVolumeRequest, opts ...grpc.CallOption) (*LookupVolumeResponse, error)
 }
 
 type seaweedFilerClient struct {
@@ -593,15 +673,6 @@ func (c *seaweedFilerClient) GetEntryAttributes(ctx context.Context, in *GetEntr
 	return out, nil
 }
 
-func (c *seaweedFilerClient) GetFileContent(ctx context.Context, in *GetFileContentRequest, opts ...grpc.CallOption) (*GetFileContentResponse, error) {
-	out := new(GetFileContentResponse)
-	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/GetFileContent", in, out, c.cc, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
-}
-
 func (c *seaweedFilerClient) CreateEntry(ctx context.Context, in *CreateEntryRequest, opts ...grpc.CallOption) (*CreateEntryResponse, error) {
 	out := new(CreateEntryResponse)
 	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/CreateEntry", in, out, c.cc, opts...)
@@ -638,17 +709,26 @@ func (c *seaweedFilerClient) AssignVolume(ctx context.Context, in *AssignVolumeR
 	return out, nil
 }
 
+func (c *seaweedFilerClient) LookupVolume(ctx context.Context, in *LookupVolumeRequest, opts ...grpc.CallOption) (*LookupVolumeResponse, error) {
+	out := new(LookupVolumeResponse)
+	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/LookupVolume", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for SeaweedFiler service
 
 type SeaweedFilerServer interface {
 	LookupDirectoryEntry(context.Context, *LookupDirectoryEntryRequest) (*LookupDirectoryEntryResponse, error)
 	ListEntries(context.Context, *ListEntriesRequest) (*ListEntriesResponse, error)
 	GetEntryAttributes(context.Context, *GetEntryAttributesRequest) (*GetEntryAttributesResponse, error)
-	GetFileContent(context.Context, *GetFileContentRequest) (*GetFileContentResponse, error)
 	CreateEntry(context.Context, *CreateEntryRequest) (*CreateEntryResponse, error)
 	UpdateEntry(context.Context, *UpdateEntryRequest) (*UpdateEntryResponse, error)
 	DeleteEntry(context.Context, *DeleteEntryRequest) (*DeleteEntryResponse, error)
 	AssignVolume(context.Context, *AssignVolumeRequest) (*AssignVolumeResponse, error)
+	LookupVolume(context.Context, *LookupVolumeRequest) (*LookupVolumeResponse, error)
 }
 
 func RegisterSeaweedFilerServer(s *grpc.Server, srv SeaweedFilerServer) {
@@ -709,24 +789,6 @@ func _SeaweedFiler_GetEntryAttributes_Handler(srv interface{}, ctx context.Conte
 	return interceptor(ctx, in, info, handler)
 }
 
-func _SeaweedFiler_GetFileContent_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(GetFileContentRequest)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(SeaweedFilerServer).GetFileContent(ctx, in)
-	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/filer_pb.SeaweedFiler/GetFileContent",
-	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(SeaweedFilerServer).GetFileContent(ctx, req.(*GetFileContentRequest))
-	}
-	return interceptor(ctx, in, info, handler)
-}
-
 func _SeaweedFiler_CreateEntry_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(CreateEntryRequest)
 	if err := dec(in); err != nil {
@@ -799,6 +861,24 @@ func _SeaweedFiler_AssignVolume_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SeaweedFiler_LookupVolume_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(LookupVolumeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedFilerServer).LookupVolume(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/filer_pb.SeaweedFiler/LookupVolume",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedFilerServer).LookupVolume(ctx, req.(*LookupVolumeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "filer_pb.SeaweedFiler",
 	HandlerType: (*SeaweedFilerServer)(nil),
@@ -816,10 +896,6 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			Handler:    _SeaweedFiler_GetEntryAttributes_Handler,
 		},
 		{
-			MethodName: "GetFileContent",
-			Handler:    _SeaweedFiler_GetFileContent_Handler,
-		},
-		{
 			MethodName: "CreateEntry",
 			Handler:    _SeaweedFiler_CreateEntry_Handler,
 		},
@@ -835,6 +911,10 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			MethodName: "AssignVolume",
 			Handler:    _SeaweedFiler_AssignVolume_Handler,
 		},
+		{
+			MethodName: "LookupVolume",
+			Handler:    _SeaweedFiler_LookupVolume_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "filer.proto",
@@ -843,53 +923,61 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	0x59, 0xa6, 0x2d, 0xf3, 0x6d, 0x8b, 0x39, 0xfd, 0x06, 0xa6, 0x5a, 0xf5, 0xbb, 0x65, 0x1e, 0x01,
+	0x5c, 0x2b, 0xc3, 0x9c, 0x25, 0x5a, 0x7d, 0xfd, 0xd0, 0xd7, 0x96, 0x17, 0x09, 0xa7, 0xdf, 0x83,
+	0x7f, 0x91, 0x6b, 0xe6, 0x9c, 0x9c, 0x82, 0x9f, 0xd6, 0x1b, 0x23, 0xd4, 0xa4, 0x7d, 0xed, 0xda,
+	0x2f, 0x6c, 0x9d, 0xe8, 0x77, 0xb0, 0x57, 0x9b, 0xeb, 0x3a, 0x9c, 0x4d, 0x75, 0x8c, 0x6e, 0xd5,
+	0x41, 0xff, 0x75, 0xe0, 0xa0, 0x4b, 0xd9, 0x5c, 0xd5, 0x25, 0xec, 0x37, 0x29, 0xe6, 0xeb, 0xa8,
+	0x30, 0x5c, 0x4e, 0x6d, 0x2e, 0xfd, 0xb0, 0x86, 0x20, 0x7f, 0x19, 0x15, 0xba, 0x05, 0x26, 0xa9,
+	0x65, 0x9a, 0xfd, 0x04, 0x1f, 0xf7, 0x5c, 0x24, 0xeb, 0x2b, 0xac, 0x7b, 0x50, 0x2e, 0xc9, 0x23,
+	0xf0, 0xae, 0xa3, 0xb4, 0x42, 0xd3, 0xef, 0xd3, 0xfe, 0x0d, 0xf0, 0x50, 0x7b, 0x7c, 0x3b, 0x7a,
+	0xec, 0x9c, 0xfd, 0xe3, 0xc1, 0xe4, 0x35, 0x46, 0xbf, 0x23, 0x26, 0x72, 0xfa, 0x4b, 0xb2, 0xaa,
+	0xab, 0xea, 0x7e, 0x7e, 0xc9, 0x83, 0xdb, 0xf4, 0x07, 0xbf, 0xf7, 0xb3, 0x2f, 0xdf, 0xe6, 0x66,
+	0xda, 0x7a, 0x8b, 0x5c, 0xc0, 0xd8, 0xfa, 0xd8, 0x92, 0x43, 0x2b, 0xb0, 0xf7, 0xdd, 0x9e, 0x1d,
+	0x6d, 0x38, 0x6d, 0xd0, 0x22, 0x20, 0x7d, 0xdd, 0x25, 0x9f, 0xb7, 0x61, 0x1b, 0xf5, 0x7f, 0xf6,
+	0xc5, 0x9b, 0x9d, 0x6c, 0xc2, 0x96, 0x28, 0xd9, 0x84, 0xfb, 0x32, 0x68, 0x13, 0x1e, 0x52, 0x32,
+	0x85, 0x66, 0x09, 0x8e, 0x8d, 0xd6, 0x97, 0x38, 0x1b, 0x6d, 0x48, 0xa5, 0x14, 0x9a, 0x25, 0x1e,
+	0x36, 0x5a, 0x5f, 0xbe, 0x6c, 0xb4, 0x21, 0xc5, 0xd9, 0x22, 0xaf, 0x60, 0x62, 0x8b, 0x00, 0xb1,
+	0x02, 0x06, 0xb4, 0x68, 0x76, 0x7f, 0xd3, 0xb1, 0x0d, 0x68, 0xf7, 0xbc, 0x0d, 0x38, 0x30, 0xf5,
+	0x36, 0xe0, 0xd0, 0xa8, 0xd0, 0xad, 0xc5, 0x8e, 0xfa, 0x0d, 0xfd, 0xfa, 0xbf, 0x00, 0x00, 0x00,
+	0xff, 0xff, 0x01, 0xeb, 0x13, 0xfa, 0x95, 0x0a, 0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index da02ce169..7fba6a7ce 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -3,7 +3,6 @@ package weed_server
 import (
 	"context"
 	"github.com/chrislusf/seaweedfs/weed/operation"
-	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/filer2"
@@ -88,20 +87,31 @@ func (fs *FilerServer) GetEntryAttributes(ctx context.Context, req *filer_pb.Get
 	}, nil
 }
 
-func (fs *FilerServer) GetFileContent(ctx context.Context, req *filer_pb.GetFileContentRequest) (*filer_pb.GetFileContentResponse, error) {
+func (fs *FilerServer) LookupVolume(ctx context.Context, req *filer_pb.LookupVolumeRequest) (*filer_pb.LookupVolumeResponse, error) {
 
-	server, err := operation.LookupFileId(fs.getMasterNode(), req.FileId)
+	lookupResult, err := operation.LookupVolumeIds(fs.getMasterNode(), req.VolumeIds)
 	if err != nil {
 		return nil, err
 	}
-	content, err := util.Get(server)
-	if err != nil {
-		return nil, err
+
+	resp := &filer_pb.LookupVolumeResponse{
+		LocationsMap: make(map[string]*filer_pb.Locations),
 	}
 
-	return &filer_pb.GetFileContentResponse{
-		Content: content,
-	}, nil
+	for vid, locations := range lookupResult {
+		var locs []*filer_pb.Location
+		for _, loc := range locations.Locations {
+			locs = append(locs, &filer_pb.Location{
+				Url:       loc.Url,
+				PublicUrl: loc.PublicUrl,
+			})
+		}
+		resp.LocationsMap[vid] = &filer_pb.Locations{
+			Locations: locs,
+		}
+	}
+
+	return resp, nil
 }
 
 func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntryRequest) (resp *filer_pb.CreateEntryResponse, err error) {
diff --git a/weed/util/http_util.go b/weed/util/http_util.go
index ca9f7c50e..00dbdf90f 100644
--- a/weed/util/http_util.go
+++ b/weed/util/http_util.go
@@ -183,3 +183,33 @@ func NormalizeUrl(url string) string {
 	}
 	return "http://" + url
 }
+
+func ReadUrl(fileUrl string, offset int64, size int, buf []byte) (n int64, e error) {
+
+	req, _ := http.NewRequest("GET", fileUrl, nil)
+	req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+int64(size)))
+
+	r, err := client.Do(req)
+	if err != nil {
+		return 0, err
+	}
+	defer r.Body.Close()
+	if r.StatusCode >= 400 {
+		return 0, fmt.Errorf("%s: %s", fileUrl, r.Status)
+	}
+
+	var i, m int
+
+	for {
+		m, err = r.Body.Read(buf[i:cap(buf)])
+		i += m
+		n += int64(m)
+		if err == io.EOF {
+			return n, nil
+		}
+		if e != nil {
+			return n, e
+		}
+	}
+
+}