4 files changed, 95 insertions, 3 deletions
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index 232d28667..d92b17b5b 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -41,7 +41,7 @@ func newFileHandle(file *File, uid, gid uint32) *FileHandle {
 	fh := &FileHandle{
 		f: file,
 		// dirtyPages: newContinuousDirtyPages(file, writeOnly),
-		dirtyPages: newTempFileDirtyPages(file),
+		dirtyPages: newPageWriter(file, 2*1024*1024),
 		Uid:        uid,
 		Gid:        gid,
 	}
diff --git a/weed/filesys/page_writer.go b/weed/filesys/page_writer.go
new file mode 100644
index 000000000..9c9e38968
--- /dev/null
+++ b/weed/filesys/page_writer.go
@@ -0,0 +1,78 @@
+package filesys
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/filesys/page_writer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+type PageWriter struct {
+	f             *File
+	collection    string
+	replication   string
+	chunkSize     int64
+	writerPattern *WriterPattern
+
+	randomWriter page_writer.DirtyPages
+	streamWriter page_writer.DirtyPages
+}
+
+var (
+	_ = page_writer.DirtyPages(&PageWriter{})
+)
+
+func newPageWriter(file *File, chunkSize int64) *PageWriter {
+	pw := &PageWriter{
+		f:             file,
+		chunkSize:     chunkSize,
+		randomWriter:  newTempFileDirtyPages(file),
+		streamWriter:  newContinuousDirtyPages(file),
+		writerPattern: NewWriterPattern(file.Name, chunkSize),
+	}
+	return pw
+}
+
+func (pw *PageWriter) AddPage(offset int64, data []byte) {
+
+	glog.V(4).Infof("AddPage %v [%d, %d) streaming:%v", pw.f.fullpath(), offset, offset+int64(len(data)), pw.writerPattern.IsStreamingMode())
+
+	pw.writerPattern.MonitorWriteAt(offset, len(data))
+
+	chunkIndex := offset / pw.chunkSize
+	for i := chunkIndex; len(data) > 0; i++ {
+		writeSize := min(int64(len(data)), (i+1)*pw.chunkSize-offset)
+		pw.addToOneChunk(i, offset, data[:writeSize])
+		offset += writeSize
+		data = data[writeSize:]
+	}
+}
+
+func (pw *PageWriter) addToOneChunk(chunkIndex, offset int64, data []byte) {
+	if chunkIndex > 0 {
+		if pw.writerPattern.IsStreamingMode() {
+			pw.streamWriter.AddPage(offset, data)
+			return
+		}
+	}
+	pw.randomWriter.AddPage(offset, data)
+}
+
+func (pw *PageWriter) FlushData() error {
+	if err := pw.streamWriter.FlushData(); err != nil {
+		return err
+	}
+	return pw.randomWriter.FlushData()
+}
+
+func (pw *PageWriter) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) {
+	glog.V(4).Infof("ReadDirtyDataAt %v [%d, %d)", pw.f.fullpath(), startOffset, startOffset+int64(len(data)))
+	m1 := pw.streamWriter.ReadDirtyDataAt(data, startOffset)
+	m2 := pw.randomWriter.ReadDirtyDataAt(data, startOffset)
+	return max(m1, m2)
+}
+
+func (pw *PageWriter) GetStorageOptions() (collection, replication string) {
+	if pw.writerPattern.IsStreamingMode() {
+		return pw.streamWriter.GetStorageOptions()
+	}
+	return pw.randomWriter.GetStorageOptions()
+}
diff --git a/weed/filesys/page_writer/page_chunk.go b/weed/filesys/page_writer/page_chunk.go
new file mode 100644
index 000000000..b21e6acca
--- /dev/null
+++ b/weed/filesys/page_writer/page_chunk.go
@@ -0,0 +1 @@
+package page_writer
diff --git a/weed/filesys/page_writer/writer_pattern.go b/weed/filesys/page_writer_pattern.go
index c7641c37f..fdd796215 100644
--- a/weed/filesys/page_writer/writer_pattern.go
+++ b/weed/filesys/page_writer_pattern.go
@@ -1,22 +1,35 @@
-package page_writer
+package filesys
+
+import "fmt"
 
 type WriterPattern struct {
 	isStreaming     bool
 	lastWriteOffset int64
+	chunkSize       int64
+	fileName        string
 }
 
 // For streaming write: only cache the first chunk
 // For random write: fall back to temp file approach
+// writes can only change from streaming mode to non-streaming mode
 
-func NewWriterPattern() *WriterPattern {
+func NewWriterPattern(fileName string, chunkSize int64) *WriterPattern {
 	return &WriterPattern{
 		isStreaming:     true,
 		lastWriteOffset: 0,
+		chunkSize:       chunkSize,
+		fileName:        fileName,
 	}
 }
 
 func (rp *WriterPattern) MonitorWriteAt(offset int64, size int) {
+	if rp.lastWriteOffset == 0 {
+	}
 	if rp.lastWriteOffset > offset {
+		if rp.isStreaming {
+			fmt.Printf("file %s ==> non streaming at [%d,%d)\n", rp.fileName, offset, offset+int64(size))
+		}
+		fmt.Printf("write %s [%d,%d)\n", rp.fileName, offset, offset+int64(size))
 		rp.isStreaming = false
 	}
 	rp.lastWriteOffset = offset