Add boltdb for volume needle map

boltdb is fairly slow to write, about 6 minutes for recreating index
for 1553934 files. Boltdb loads 1,553,934 x 16 = 24,862,944bytes from
disk, and generate the boltdb as large as 134,217,728 bytes in 6
minutes.

To compare, for leveldb, it recreates index in leveldb as large as
27,188,148 bytes in 8 seconds.
For in memory version, it loads the index in

To test the memory consumption, the leveldb or boltdb index are
created. And the server is restarted. Using the benchmark tool to read
lots of files. There are 7 volumes in benchmark collection, each with
about 1553K files.
For leveldb, the memory starts at 142,884KB, and stays at 179,340KB.
For boltdb, the memory starts at 73,756KB, and stays at 144,564KB.
For in-memory, the memory starts at 368,152KB, and stays at 448,032KB.

6 files changed, 246 insertions, 46 deletions

diff --git a/go/storage/needle_map.go b/go/storage/needle_map.go
index 0bfa12180..c05aae745 100644
--- a/go/storage/needle_map.go
+++ b/go/storage/needle_map.go
@@ -7,6 +7,14 @@ import (
 	"github.com/chrislusf/weed-fs/go/util"
 )
 
+type NeedleMapType int
+
+const (
+	NeedleMapInMemory NeedleMapType = iota
+	NeedleMapLevelDb
+	NeedleMapBoltDb
+)
+
 type NeedleMapper interface {
 	Put(key uint64, offset uint32, size uint32) error
 	Get(key uint64) (element *NeedleValue, ok bool)
diff --git a/go/storage/needle_map_boltdb.go b/go/storage/needle_map_boltdb.go
new file mode 100644
index 000000000..bef10299a
--- /dev/null
+++ b/go/storage/needle_map_boltdb.go
@@ -0,0 +1,182 @@
+package storage
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/boltdb/bolt"
+
+	"github.com/chrislusf/weed-fs/go/glog"
+	"github.com/chrislusf/weed-fs/go/util"
+)
+
+type BoltDbNeedleMap struct {
+	dbFileName string
+	indexFile  *os.File
+	db         *bolt.DB
+	mapMetric
+}
+
+var boltdbBucket = []byte("weed")
+
+func NewBoltDbNeedleMap(dbFileName string, indexFile *os.File) (m *BoltDbNeedleMap, err error) {
+	m = &BoltDbNeedleMap{indexFile: indexFile, dbFileName: dbFileName}
+	if !isBoltDbFresh(dbFileName, indexFile) {
+		glog.V(1).Infof("Start to Generate %s from %s", dbFileName, indexFile.Name())
+		generateBoltDbFile(dbFileName, indexFile)
+		glog.V(1).Infof("Finished Generating %s from %s", dbFileName, indexFile.Name())
+	}
+	glog.V(1).Infof("Opening %s...", dbFileName)
+	if m.db, err = bolt.Open(dbFileName, 0644, nil); err != nil {
+		return
+	}
+	glog.V(1).Infof("Loading %s...", indexFile.Name())
+	nm, indexLoadError := LoadNeedleMap(indexFile)
+	if indexLoadError != nil {
+		return nil, indexLoadError
+	}
+	m.mapMetric = nm.mapMetric
+	return
+}
+
+func isBoltDbFresh(dbFileName string, indexFile *os.File) bool {
+	// normally we always write to index file first
+	dbLogFile, err := os.Open(dbFileName)
+	if err != nil {
+		return false
+	}
+	defer dbLogFile.Close()
+	dbStat, dbStatErr := dbLogFile.Stat()
+	indexStat, indexStatErr := indexFile.Stat()
+	if dbStatErr != nil || indexStatErr != nil {
+		glog.V(0).Infof("Can not stat file: %v and %v", dbStatErr, indexStatErr)
+		return false
+	}
+
+	return dbStat.ModTime().After(indexStat.ModTime())
+}
+
+func generateBoltDbFile(dbFileName string, indexFile *os.File) error {
+	db, err := bolt.Open(dbFileName, 0644, nil)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+	return WalkIndexFile(indexFile, func(key uint64, offset, size uint32) error {
+		if offset > 0 {
+			boltDbWrite(db, key, offset, size)
+		} else {
+			boltDbDelete(db, key)
+		}
+		return nil
+	})
+}
+
+func (m *BoltDbNeedleMap) Get(key uint64) (element *NeedleValue, ok bool) {
+	bytes := make([]byte, 8)
+	var data []byte
+	util.Uint64toBytes(bytes, key)
+	err := m.db.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket(boltdbBucket)
+		if bucket == nil {
+			return fmt.Errorf("Bucket %q not found!", boltdbBucket)
+		}
+
+		data = bucket.Get(bytes)
+		return nil
+	})
+
+	if err != nil || len(data) != 8 {
+		glog.V(0).Infof("Failed to get %d %v", key, err)
+		return nil, false
+	}
+	offset := util.BytesToUint32(data[0:4])
+	size := util.BytesToUint32(data[4:8])
+	return &NeedleValue{Key: Key(key), Offset: offset, Size: size}, true
+}
+
+func (m *BoltDbNeedleMap) Put(key uint64, offset uint32, size uint32) error {
+	var oldSize uint32
+	if oldNeedle, ok := m.Get(key); ok {
+		oldSize = oldNeedle.Size
+	}
+	m.logPut(key, oldSize, size)
+	// write to index file first
+	if err := appendToIndexFile(m.indexFile, key, offset, size); err != nil {
+		return fmt.Errorf("cannot write to indexfile %s: %v", m.indexFile.Name(), err)
+	}
+	return boltDbWrite(m.db, key, offset, size)
+}
+
+func boltDbWrite(db *bolt.DB,
+	key uint64, offset uint32, size uint32) error {
+	bytes := make([]byte, 16)
+	util.Uint64toBytes(bytes[0:8], key)
+	util.Uint32toBytes(bytes[8:12], offset)
+	util.Uint32toBytes(bytes[12:16], size)
+	return db.Update(func(tx *bolt.Tx) error {
+		bucket, err := tx.CreateBucketIfNotExists(boltdbBucket)
+		if err != nil {
+			return err
+		}
+
+		err = bucket.Put(bytes[0:8], bytes[8:16])
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+}
+func boltDbDelete(db *bolt.DB, key uint64) error {
+	bytes := make([]byte, 8)
+	util.Uint64toBytes(bytes, key)
+	return db.Update(func(tx *bolt.Tx) error {
+		bucket, err := tx.CreateBucketIfNotExists(boltdbBucket)
+		if err != nil {
+			return err
+		}
+
+		err = bucket.Delete(bytes)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+}
+
+func (m *BoltDbNeedleMap) Delete(key uint64) error {
+	if oldNeedle, ok := m.Get(key); ok {
+		m.logDelete(oldNeedle.Size)
+	}
+	// write to index file first
+	if err := appendToIndexFile(m.indexFile, key, 0, 0); err != nil {
+		return err
+	}
+	return boltDbDelete(m.db, key)
+}
+
+func (m *BoltDbNeedleMap) Close() {
+	m.db.Close()
+}
+
+func (m *BoltDbNeedleMap) Destroy() error {
+	m.Close()
+	os.Remove(m.indexFile.Name())
+	return os.Remove(m.dbFileName)
+}
+
+func (m *BoltDbNeedleMap) ContentSize() uint64 {
+	return m.FileByteCounter
+}
+func (m *BoltDbNeedleMap) DeletedSize() uint64 {
+	return m.DeletionByteCounter
+}
+func (m *BoltDbNeedleMap) FileCount() int {
+	return m.FileCounter
+}
+func (m *BoltDbNeedleMap) DeletedCount() int {
+	return m.DeletionCounter
+}
+func (m *BoltDbNeedleMap) MaxFileKey() uint64 {
+	return m.MaximumFileKey
+}
diff --git a/go/storage/needle_map_leveldb.go b/go/storage/needle_map_leveldb.go
index 73595278d..32f763b4f 100644
--- a/go/storage/needle_map_leveldb.go
+++ b/go/storage/needle_map_leveldb.go
@@ -21,7 +21,7 @@ func NewLevelDbNeedleMap(dbFileName string, indexFile *os.File) (m *LevelDbNeedl
 	m = &LevelDbNeedleMap{indexFile: indexFile, dbFileName: dbFileName}
 	if !isLevelDbFresh(dbFileName, indexFile) {
 		glog.V(1).Infof("Start to Generate %s from %s", dbFileName, indexFile.Name())
-		generateDbFile(dbFileName, indexFile)
+		generateLevelDbFile(dbFileName, indexFile)
 		glog.V(1).Infof("Finished Generating %s from %s", dbFileName, indexFile.Name())
 	}
 	glog.V(1).Infof("Opening %s...", dbFileName)
@@ -54,7 +54,7 @@ func isLevelDbFresh(dbFileName string, indexFile *os.File) bool {
 	return dbStat.ModTime().After(indexStat.ModTime())
 }
 
-func generateDbFile(dbFileName string, indexFile *os.File) error {
+func generateLevelDbFile(dbFileName string, indexFile *os.File) error {
 	db, err := leveldb.OpenFile(dbFileName, nil)
 	if err != nil {
 		return err
@@ -75,7 +75,6 @@ func (m *LevelDbNeedleMap) Get(key uint64) (element *NeedleValue, ok bool) {
 	util.Uint64toBytes(bytes, key)
 	data, err := m.db.Get(bytes, nil)
 	if err != nil || len(data) != 8 {
-		glog.V(0).Infof("Failed to get %d %v", key, err)
 		return nil, false
 	}
 	offset := util.BytesToUint32(data[0:4])
diff --git a/go/storage/store.go b/go/storage/store.go
index 65e5b218b..eb44bd9d0 100644
--- a/go/storage/store.go
+++ b/go/storage/store.go
@@ -90,18 +90,18 @@ func (s *Store) String() (str string) {
 	return
 }
 
-func NewStore(port int, ip, publicUrl string, dirnames []string, maxVolumeCounts []int, useLevelDb bool) (s *Store) {
+func NewStore(port int, ip, publicUrl string, dirnames []string, maxVolumeCounts []int, needleMapKind NeedleMapType) (s *Store) {
 	s = &Store{Port: port, Ip: ip, PublicUrl: publicUrl}
 	s.Locations = make([]*DiskLocation, 0)
 	for i := 0; i < len(dirnames); i++ {
 		location := &DiskLocation{Directory: dirnames[i], MaxVolumeCount: maxVolumeCounts[i]}
 		location.volumes = make(map[VolumeId]*Volume)
-		location.loadExistingVolumes(useLevelDb)
+		location.loadExistingVolumes(needleMapKind)
 		s.Locations = append(s.Locations, location)
 	}
 	return
 }
-func (s *Store) AddVolume(volumeListString string, collection string, useLevelDb bool, replicaPlacement string, ttlString string) error {
+func (s *Store) AddVolume(volumeListString string, collection string, needleMapKind NeedleMapType, replicaPlacement string, ttlString string) error {
 	rt, e := NewReplicaPlacementFromString(replicaPlacement)
 	if e != nil {
 		return e
@@ -117,7 +117,7 @@ func (s *Store) AddVolume(volumeListString string, collection string, useLevelDb
 			if err != nil {
 				return fmt.Errorf("Volume Id %s is not a valid unsigned integer!", id_string)
 			}
-			e = s.addVolume(VolumeId(id), collection, useLevelDb, rt, ttl)
+			e = s.addVolume(VolumeId(id), collection, needleMapKind, rt, ttl)
 		} else {
 			pair := strings.Split(range_string, "-")
 			start, start_err := strconv.ParseUint(pair[0], 10, 64)
@@ -129,7 +129,7 @@ func (s *Store) AddVolume(volumeListString string, collection string, useLevelDb
 				return fmt.Errorf("Volume End Id %s is not a valid unsigned integer!", pair[1])
 			}
 			for id := start; id <= end; id++ {
-				if err := s.addVolume(VolumeId(id), collection, useLevelDb, rt, ttl); err != nil {
+				if err := s.addVolume(VolumeId(id), collection, needleMapKind, rt, ttl); err != nil {
 					e = err
 				}
 			}
@@ -178,14 +178,14 @@ func (s *Store) findFreeLocation() (ret *DiskLocation) {
 	}
 	return ret
 }
-func (s *Store) addVolume(vid VolumeId, collection string, useLevelDb bool, replicaPlacement *ReplicaPlacement, ttl *TTL) error {
+func (s *Store) addVolume(vid VolumeId, collection string, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *TTL) error {
 	if s.findVolume(vid) != nil {
 		return fmt.Errorf("Volume Id %d already exists!", vid)
 	}
 	if location := s.findFreeLocation(); location != nil {
 		glog.V(0).Infof("In dir %s adds volume:%v collection:%s replicaPlacement:%v ttl:%v",
 			location.Directory, vid, collection, replicaPlacement, ttl)
-		if volume, err := NewVolume(location.Directory, collection, vid, useLevelDb, replicaPlacement, ttl); err == nil {
+		if volume, err := NewVolume(location.Directory, collection, vid, needleMapKind, replicaPlacement, ttl); err == nil {
 			location.volumes[vid] = volume
 			return nil
 		} else {
@@ -195,7 +195,7 @@ func (s *Store) addVolume(vid VolumeId, collection string, useLevelDb bool, repl
 	return fmt.Errorf("No more free space left")
 }
 
-func (l *DiskLocation) loadExistingVolumes(useLevelDb bool) {
+func (l *DiskLocation) loadExistingVolumes(needleMapKind NeedleMapType) {
 	if dirs, err := ioutil.ReadDir(l.Directory); err == nil {
 		for _, dir := range dirs {
 			name := dir.Name()
@@ -208,7 +208,7 @@ func (l *DiskLocation) loadExistingVolumes(useLevelDb bool) {
 				}
 				if vid, err := NewVolumeId(base); err == nil {
 					if l.volumes[vid] == nil {
-						if v, e := NewVolume(l.Directory, collection, vid, useLevelDb, nil, nil); e == nil {
+						if v, e := NewVolume(l.Directory, collection, vid, needleMapKind, nil, nil); e == nil {
 							l.volumes[vid] = v
 							glog.V(0).Infof("data file %s, replicaPlacement=%s v=%d size=%d ttl=%s", l.Directory+"/"+name, v.ReplicaPlacement, v.Version(), v.Size(), v.Ttl.String())
 						}
diff --git a/go/storage/volume.go b/go/storage/volume.go
index 2b47fb497..e35eeee49 100644
--- a/go/storage/volume.go
+++ b/go/storage/volume.go
@@ -14,12 +14,13 @@ import (
 )
 
 type Volume struct {
-	Id         VolumeId
-	dir        string
-	Collection string
-	dataFile   *os.File
-	nm         NeedleMapper
-	readOnly   bool
+	Id            VolumeId
+	dir           string
+	Collection    string
+	dataFile      *os.File
+	nm            NeedleMapper
+	needleMapKind NeedleMapType
+	readOnly      bool
 
 	SuperBlock
 
@@ -27,20 +28,22 @@ type Volume struct {
 	lastModifiedTime uint64 //unix time in seconds
 }
 
-func NewVolume(dirname string, collection string, id VolumeId, useLevelDb bool, replicaPlacement *ReplicaPlacement, ttl *TTL) (v *Volume, e error) {
+func NewVolume(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *TTL) (v *Volume, e error) {
 	v = &Volume{dir: dirname, Collection: collection, Id: id}
 	v.SuperBlock = SuperBlock{ReplicaPlacement: replicaPlacement, Ttl: ttl}
-	e = v.load(true, true, useLevelDb)
+	v.needleMapKind = needleMapKind
+	e = v.load(true, true, needleMapKind)
 	return
 }
 func (v *Volume) String() string {
 	return fmt.Sprintf("Id:%v, dir:%s, Collection:%s, dataFile:%v, nm:%v, readOnly:%v", v.Id, v.dir, v.Collection, v.dataFile, v.nm, v.readOnly)
 }
 
-func loadVolumeWithoutIndex(dirname string, collection string, id VolumeId) (v *Volume, e error) {
+func loadVolumeWithoutIndex(dirname string, collection string, id VolumeId, needleMapKind NeedleMapType) (v *Volume, e error) {
 	v = &Volume{dir: dirname, Collection: collection, Id: id}
 	v.SuperBlock = SuperBlock{}
-	e = v.load(false, false, false)
+	v.needleMapKind = needleMapKind
+	e = v.load(false, false, needleMapKind)
 	return
 }
 func (v *Volume) FileName() (fileName string) {
@@ -51,7 +54,7 @@ func (v *Volume) FileName() (fileName string) {
 	}
 	return
 }
-func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, useLevelDb bool) error {
+func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, needleMapKind NeedleMapType) error {
 	var e error
 	fileName := v.FileName()
 
@@ -99,16 +102,22 @@ func (v *Volume) load(alsoLoadIndex bool, createDatIfMissing bool, useLevelDb bo
 				return fmt.Errorf("cannot write Volume Index %s.idx: %v", fileName, e)
 			}
 		}
-		if !useLevelDb {
+		switch needleMapKind {
+		case NeedleMapInMemory:
 			glog.V(0).Infoln("loading index file", fileName+".idx", "readonly", v.readOnly)
 			if v.nm, e = LoadNeedleMap(indexFile); e != nil {
 				glog.V(0).Infof("loading index %s error: %v", fileName+".idx", e)
 			}
-		} else {
+		case NeedleMapLevelDb:
 			glog.V(0).Infoln("loading leveldb file", fileName+".ldb")
 			if v.nm, e = NewLevelDbNeedleMap(fileName+".ldb", indexFile); e != nil {
 				glog.V(0).Infof("loading leveldb %s error: %v", fileName+".ldb", e)
 			}
+		case NeedleMapBoltDb:
+			glog.V(0).Infoln("loading boltdb file", fileName+".bdb")
+			if v.nm, e = NewBoltDbNeedleMap(fileName+".bdb", indexFile); e != nil {
+				glog.V(0).Infof("loading boltdb %s error: %v", fileName+".bdb", e)
+			}
 		}
 	}
 	return e
@@ -263,11 +272,12 @@ func (v *Volume) read(n *Needle) (int, error) {
 }
 
 func ScanVolumeFile(dirname string, collection string, id VolumeId,
+	needleMapKind NeedleMapType,
 	visitSuperBlock func(SuperBlock) error,
 	readNeedleBody bool,
 	visitNeedle func(n *Needle, offset int64) error) (err error) {
 	var v *Volume
-	if v, err = loadVolumeWithoutIndex(dirname, collection, id); err != nil {
+	if v, err = loadVolumeWithoutIndex(dirname, collection, id, needleMapKind); err != nil {
 		return fmt.Errorf("Failed to load volume %d: %v", id, err)
 	}
 	if err = visitSuperBlock(v.SuperBlock); err != nil {
diff --git a/go/storage/volume_vacuum.go b/go/storage/volume_vacuum.go
index 9f6f8e35f..eab138000 100644
--- a/go/storage/volume_vacuum.go
+++ b/go/storage/volume_vacuum.go
@@ -38,7 +38,7 @@ func (v *Volume) commitCompact() error {
 	}
 	//glog.V(3).Infof("Pretending to be vacuuming...")
 	//time.Sleep(20 * time.Second)
-	if e = v.load(true, false, false); e != nil {
+	if e = v.load(true, false, v.needleMapKind); e != nil {
 		return e
 	}
 	return nil
@@ -63,27 +63,28 @@ func (v *Volume) copyDataAndGenerateIndexFile(dstName, idxName string) (err erro
 
 	now := uint64(time.Now().Unix())
 
-	err = ScanVolumeFile(v.dir, v.Collection, v.Id, func(superBlock SuperBlock) error {
-		_, err = dst.Write(superBlock.Bytes())
-		return err
-	}, true, func(n *Needle, offset int64) error {
-		if n.HasTtl() && now >= n.LastModified+uint64(v.Ttl.Minutes()*60) {
-			return nil
-		}
-		nv, ok := v.nm.Get(n.Id)
-		glog.V(4).Infoln("needle expected offset ", offset, "ok", ok, "nv", nv)
-		if ok && int64(nv.Offset)*NeedlePaddingSize == offset && nv.Size > 0 {
-			if err = nm.Put(n.Id, uint32(new_offset/NeedlePaddingSize), n.Size); err != nil {
-				return fmt.Errorf("cannot put needle: %s", err)
+	err = ScanVolumeFile(v.dir, v.Collection, v.Id, v.needleMapKind,
+		func(superBlock SuperBlock) error {
+			_, err = dst.Write(superBlock.Bytes())
+			return err
+		}, true, func(n *Needle, offset int64) error {
+			if n.HasTtl() && now >= n.LastModified+uint64(v.Ttl.Minutes()*60) {
+				return nil
 			}
-			if _, err = n.Append(dst, v.Version()); err != nil {
-				return fmt.Errorf("cannot append needle: %s", err)
+			nv, ok := v.nm.Get(n.Id)
+			glog.V(4).Infoln("needle expected offset ", offset, "ok", ok, "nv", nv)
+			if ok && int64(nv.Offset)*NeedlePaddingSize == offset && nv.Size > 0 {
+				if err = nm.Put(n.Id, uint32(new_offset/NeedlePaddingSize), n.Size); err != nil {
+					return fmt.Errorf("cannot put needle: %s", err)
+				}
+				if _, err = n.Append(dst, v.Version()); err != nil {
+					return fmt.Errorf("cannot append needle: %s", err)
+				}
+				new_offset += n.DiskSize()
+				glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", new_offset, "data_size", n.Size)
 			}
-			new_offset += n.DiskSize()
-			glog.V(3).Infoln("saving key", n.Id, "volume offset", offset, "=>", new_offset, "data_size", n.Size)
-		}
-		return nil
-	})
+			return nil
+		})
 
 	return
 }