1. volume server now sends master server its max file key, so that

master server does not need to store the sequence on disk any more
2. fix raft server's failure to init cluster during bootstrapping

go/storage/cdb_map.go

@@ -80,8 +80,8 @@ func (m cdbMap) FileCount() int {
 func (m *cdbMap) DeletedCount() int {
 	return m.DeletionCounter
 }
-func (m *cdbMap) NextFileKey(count int) uint64 {
-	return 0
+func (m *cdbMap) MaxFileKey() uint64 {
+	return m.MaximumFileKey
 }
 
 func getMetric(c *cdb.Cdb, m *mapMetric) error {

go/storage/needle_map.go

@@ -19,7 +19,7 @@ type NeedleMapper interface {
 	FileCount() int
 	DeletedCount() int
 	Visit(visit func(NeedleValue) error) (err error)
-	NextFileKey(count int) uint64
+	MaxFileKey() uint64
 }
 
 type mapMetric struct {
@@ -110,6 +110,9 @@ func walkIndexFile(r *os.File, fn func(key uint64, offset, size uint32) error) e
 }
 
 func (nm *NeedleMap) Put(key uint64, offset uint32, size uint32) (int, error) {
+	if key > nm.MaximumFileKey {
+		nm.MaximumFileKey = key
+	}
 	oldSize := nm.m.Set(Key(key), offset, size)
 	bytes := make([]byte, 16)
 	util.Uint64toBytes(bytes[0:8], key)
@@ -172,11 +175,3 @@ func (nm *NeedleMap) Visit(visit func(NeedleValue) error) (err error) {
 func (nm NeedleMap) MaxFileKey() uint64 {
 	return nm.MaximumFileKey
 }
-func (nm NeedleMap) NextFileKey(count int) (ret uint64) {
-	if count <= 0 {
-		return 0
-	}
-	ret = nm.MaximumFileKey
-	nm.MaximumFileKey += uint64(count)
-	return
-}

go/storage/store.go

@@ -44,6 +44,9 @@ func (mn *MasterNodes) findMaster() (string, error) {
 	if mn.lastNode < 0 {
 		for _, m := range mn.nodes {
 			if masters, e := operation.ListMasters(m); e == nil {
+				if len(masters) == 0 {
+					continue
+				}
 				mn.nodes = masters
 				mn.lastNode = rand.Intn(len(mn.nodes))
 				glog.V(2).Info("current master node is :", mn.nodes[mn.lastNode])
@@ -268,6 +271,7 @@ func (s *Store) Join() error {
 	}
 	stats := new([]*VolumeInfo)
 	maxVolumeCount := 0
+	var maxFileKey uint64
 	for _, location := range s.Locations {
 		maxVolumeCount = maxVolumeCount + location.MaxVolumeCount
 		for k, v := range location.volumes {
@@ -280,6 +284,9 @@ func (s *Store) Join() error {
 				DeletedByteCount: v.nm.DeletedSize(),
 				ReadOnly:         v.readOnly}
 			*stats = append(*stats, s)
+			if maxFileKey < v.nm.MaxFileKey() {
+				maxFileKey = v.nm.MaxFileKey()
+			}
 		}
 	}
 	bytes, _ := json.Marshal(stats)
@@ -292,6 +299,7 @@ func (s *Store) Join() error {
 	values.Add("publicUrl", s.PublicUrl)
 	values.Add("volumes", string(bytes))
 	values.Add("maxVolumeCount", strconv.Itoa(maxVolumeCount))
+	values.Add("maxFileKey", strconv.FormatUint(maxFileKey, 10))
 	values.Add("dataCenter", s.dataCenter)
 	values.Add("rack", s.rack)
 	jsonBlob, err := util.Post("http://"+masterNode+"/dir/join", values)