add stream writer

this should improve streaming write performance, which is common in many cases, e.g., copying large files.

This is additional to improved random read write operations: https://github.com/chrislusf/seaweedfs/wiki/FUSE-Mount/_compare/3e69d193805c79802f4f8f6cc63269b7a9a911f3...19084d87918f297cac15e2471c19306176e0771f

1 files changed, 6 insertions, 3 deletions

diff --git a/weed/filesys/page_writer_pattern.go b/weed/filesys/page_writer_pattern.go
index 44b69cda7..51c63d472 100644
--- a/weed/filesys/page_writer_pattern.go
+++ b/weed/filesys/page_writer_pattern.go
@@ -4,19 +4,17 @@ 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(fileName string, chunkSize int64) *WriterPattern {
+func NewWriterPattern(chunkSize int64) *WriterPattern {
 	return &WriterPattern{
 		isStreaming:     true,
 		lastWriteOffset: -1,
 		chunkSize:       chunkSize,
-		fileName:        fileName,
 	}
 }
 
@@ -39,3 +37,8 @@ func (rp *WriterPattern) IsStreamingMode() bool {
 func (rp *WriterPattern) IsRandomMode() bool {
 	return !rp.isStreaming
 }
+
+func (rp *WriterPattern) Reset() {
+	rp.isStreaming = true
+	rp.lastWriteOffset = -1
+}