mount: different write strategy for streaming write and random write

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()
+}