skip seek() when index file writes

weed/storage/needle/needle_read_write.go

@@ -161,7 +161,15 @@ func ReadNeedleBlob(r backend.BackendStorageFile, offset int64, size Size, versi
 	dataSize := GetActualSize(size, version)
 	dataSlice = make([]byte, int(dataSize))
 
-	_, err = r.ReadAt(dataSlice, offset)
+	var n int
+	n, err = r.ReadAt(dataSlice, offset)
+	if err != nil && int64(n) == dataSize {
+		err = nil
+	}
+	if err != nil {
+		fileSize, _, _ := r.GetStat()
+		println("n",n, "dataSize", dataSize, "offset", offset, "fileSize", fileSize)
+	}
 	return dataSlice, err
 
 }

weed/storage/needle_map.go

@@ -1,7 +1,6 @@
 package storage
 
 import (
-	"fmt"
 	"io"
 	"os"
 	"sync"
@@ -41,6 +40,7 @@ type baseNeedleMapper struct {
 
 	indexFile           *os.File
 	indexFileAccessLock sync.Mutex
+	indexFileOffset     int64
 }
 
 func (nm *baseNeedleMapper) IndexFileSize() uint64 {
@@ -56,11 +56,10 @@ func (nm *baseNeedleMapper) appendToIndexFile(key NeedleId, offset Offset, size
 
 	nm.indexFileAccessLock.Lock()
 	defer nm.indexFileAccessLock.Unlock()
-	if _, err := nm.indexFile.Seek(0, 2); err != nil {
-		return fmt.Errorf("cannot seek end of indexfile %s: %v",
-			nm.indexFile.Name(), err)
+	written, err := nm.indexFile.WriteAt(bytes, nm.indexFileOffset)
+	if err == nil {
+		nm.indexFileOffset += int64(written)
 	}
-	_, err := nm.indexFile.Write(bytes)
 	return err
 }
 

weed/storage/needle_map_leveldb.go

@@ -31,6 +31,11 @@ func NewLevelDbNeedleMap(dbFileName string, indexFile *os.File, opts *opt.Option
 		generateLevelDbFile(dbFileName, indexFile)
 		glog.V(1).Infof("Finished Generating %s from %s", dbFileName, indexFile.Name())
 	}
+	if stat, err := indexFile.Stat(); err != nil {
+		glog.Fatalf("stat file %s: %v", indexFile.Name(), err)
+	} else {
+		m.indexFileOffset = stat.Size()
+	}
 	glog.V(1).Infof("Opening %s...", dbFileName)
 
 	if m.db, err = leveldb.OpenFile(dbFileName, opts); err != nil {

weed/storage/needle_map_memory.go

@@ -19,6 +19,11 @@ func NewCompactNeedleMap(file *os.File) *NeedleMap {
 		m: needle_map.NewCompactMap(),
 	}
 	nm.indexFile = file
+	stat, err := file.Stat()
+	if err != nil {
+		glog.Fatalf("stat file %s: %v", file.Name(), err)
+	}
+	nm.indexFileOffset = stat.Size()
 	return nm
 }