reduce memory usage

3 files changed, 19 insertions, 3 deletions

diff --git a/weed/filesys/dirty_page.go b/weed/filesys/dirty_page.go
index 858858a30..91a952421 100644
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@@ -28,6 +28,14 @@ func newDirtyPages(file *File) *ContinuousDirtyPages {
 	}
 }
 
+func (pages *ContinuousDirtyPages) InitializeToFile(file *File) *ContinuousDirtyPages {
+	if len(pages.Data) != int(file.wfs.option.ChunkSizeLimit) {
+		pages.Data = make([]byte, file.wfs.option.ChunkSizeLimit)
+	}
+	pages.f = file
+	return pages
+}
+
 func (pages *ContinuousDirtyPages) AddPage(ctx context.Context, offset int64, data []byte) (chunks []*filer_pb.FileChunk, err error) {
 
 	pages.lock.Lock()
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index b15aa68d9..78ae5d342 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -37,6 +37,15 @@ func newFileHandle(file *File, uid, gid uint32) *FileHandle {
 	}
 }
 
+func (fh *FileHandle) InitializeToFile(file *File, uid, gid uint32) *FileHandle {
+	newHandle := &FileHandle{
+		f:          file,
+		dirtyPages: fh.dirtyPages.InitializeToFile(file),
+		Uid:        uid,
+		Gid:        gid,
+	}
+	return newHandle
+}
 var _ = fs.Handle(&FileHandle{})
 
 // var _ = fs.HandleReadAller(&FileHandle{})
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index 4520f2eb5..eca74d1d6 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -72,15 +72,14 @@ func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHand
 		return wfs.handles[index]
 	}
 
-	fileHandle = newFileHandle(file, uid, gid)
-
 	if found && wfs.handles[index] != nil {
 		glog.V(4).Infoln(fullpath, "reuse previous fileHandle id", index)
-		wfs.handles[index] = fileHandle
+		wfs.handles[index].InitializeToFile(file, uid, gid)
 		fileHandle.handle = uint64(index)
 		return
 	}
 
+	fileHandle = newFileHandle(file, uid, gid)
 	for i, h := range wfs.handles {
 		if h == nil {
 			wfs.handles[i] = fileHandle