/*
This is to change replication factor in .dat file header. Need to shut down the volume servers
that has those volumes.
1. fix the .dat file in place
// just see the replication setting
go run change_replication.go -volumeId=9 -dir=/Users/chrislu/Downloads
Current Volume Replication: 000
// fix the replication setting
go run change_replication.go -volumeId=9 -dir=/Users/chrislu/Downloads -replication 001
Current Volume Replication: 000
Changing to: 001
Done.
2. copy the fixed .dat and related .idx files to some remote server
3. restart volume servers or start new volume servers.
*/
func main() {
flag.Parse()
fileName := strconv.Itoa(*fixVolumeId)
if *fixVolumeCollection != "" {
fileName = *fixVolumeCollection + "_" + fileName
}
datFile, err := os.OpenFile(path.Join(*fixVolumePath, fileName+".dat"), os.O_RDWR, 0644)
if err != nil {
glog.Fatalf("Open Volume Data File [ERROR]: %v", err)
}
defer datFile.Close()
header := make([]byte, storage.SuperBlockSize)
if _, e := datFile.Read(header); e != nil {
glog.Fatalf("cannot read volume %s super block: %v", fileName+".dat", e)
}
superBlock, err := storage.ParseSuperBlock(header)
if err != nil {
glog.Fatalf("cannot parse existing super block: %v", err)
}
fmt.Printf("Current Volume Replication: %s\n", superBlock.ReplicaPlacement)
if *targetReplica == "" {
return
}
replica, err := storage.NewReplicaPlacementFromString(*targetReplica)
if err != nil {
glog.Fatalf("cannot parse target replica %s: %v", *targetReplica, err)
}
fmt.Printf("Changing to: %s\n", replica)
superBlock.ReplicaPlacement = replica
header = superBlock.Bytes()
if n, e := datFile.WriteAt(header, 0); n == 0 || e != nil {
glog.Fatalf("cannot write super block: %v", e)
}
fmt.Println("Done.")
}
func runBackup(cmd *Command, args []string) bool {
if *s.volumeId == -1 {
return false
}
vid := storage.VolumeId(*s.volumeId)
// find volume location, replication, ttl info
lookup, err := operation.Lookup(*s.master, vid.String())
if err != nil {
fmt.Printf("Error looking up volume %d: %v\n", vid, err)
return true
}
volumeServer := lookup.Locations[0].Url
stats, err := operation.GetVolumeSyncStatus(volumeServer, vid.String())
if err != nil {
fmt.Printf("Error get volume %d status: %v\n", vid, err)
return true
}
ttl, err := storage.ReadTTL(stats.Ttl)
if err != nil {
fmt.Printf("Error get volume %d ttl %s: %v\n", vid, stats.Ttl, err)
return true
}
replication, err := storage.NewReplicaPlacementFromString(stats.Replication)
if err != nil {
fmt.Printf("Error get volume %d replication %s : %v\n", vid, stats.Replication, err)
return true
}
v, err := storage.NewVolume(*s.dir, *s.collection, vid, storage.NeedleMapInMemory, replication, ttl)
if err != nil {
fmt.Printf("Error creating or reading from volume %d: %v\n", vid, err)
return true
}
if err := v.Synchronize(volumeServer); err != nil {
fmt.Printf("Error synchronizing volume %d: %v\n", vid, err)
return true
}
return true
}
func TestFindEmptySlotsForOneVolume(t *testing.T) {
topo := setup(topologyLayout)
rp, _ := storage.NewReplicaPlacementFromString("111")
volumeGrowOption := &VolumeGrowOption{
Collection: "",
ReplicaPlacement: rp,
DataCenter: "dc1",
Rack: "",
DataNode: "",
}
servers, err := FindEmptySlotsForOneVolume(topo, volumeGrowOption, nil)
if err != nil {
fmt.Println("finding empty slots error :", err)
t.Fail()
}
for _, server := range servers {
fmt.Printf("assigned node: %s, free space: %d\n", server.Id(), server.FreeSpace())
}
}
func TestFindEmptySlotsForOneVolume(t *testing.T) {
topo := setup(topologyLayout)
vg := NewDefaultVolumeGrowth()
rp, _ := storage.NewReplicaPlacementFromString("002")
volumeGrowOption := &VolumeGrowOption{
Collection: "",
ReplicaPlacement: rp,
DataCenter: "dc1",
Rack: "",
DataNode: "",
}
servers, err := vg.findEmptySlotsForOneVolume(topo, volumeGrowOption)
if err != nil {
fmt.Println("finding empty slots error :", err)
t.Fail()
}
for _, server := range servers {
fmt.Println("assigned node :", server.Id())
}
}
func (ms *MasterServer) getVolumeGrowOption(r *http.Request) (*topology.VolumeGrowOption, error) {
replicationString := r.FormValue("replication")
if replicationString == "" {
replicationString = ms.defaultReplicaPlacement
}
replicaPlacement, err := storage.NewReplicaPlacementFromString(replicationString)
if err != nil {
return nil, err
}
ttl, err := storage.ReadTTL(r.FormValue("ttl"))
if err != nil {
return nil, err
}
volumeGrowOption := &topology.VolumeGrowOption{
Collection: r.FormValue("collection"),
ReplicaPlacement: replicaPlacement,
Ttl: ttl,
DataCenter: r.FormValue("dataCenter"),
Rack: r.FormValue("rack"),
DataNode: r.FormValue("dataNode"),
}
return volumeGrowOption, nil
}
func TestFindEmptySlotsWithExistsNodes(t *testing.T) {
topo := setup(topologyLayout)
rp, _ := storage.NewReplicaPlacementFromString("112")
volumeGrowOption := &VolumeGrowOption{
Collection: "",
ReplicaPlacement: rp,
DataCenter: "dc1",
Rack: "",
DataNode: "",
}
testLocationList := setupTestLocationList(topo)
for _, locationList := range testLocationList {
lrp := locationList.CalcReplicaPlacement()
t.Logf("location list: [%s], replica placement = %s\n", joinNodeId(locationList.list), lrp.String())
if lrp.Compare(rp) < 0 {
servers, err := FindEmptySlotsForOneVolume(topo, volumeGrowOption, locationList)
if err != nil {
t.Log("finding empty slots error :", err)
t.Fail()
}
t.Logf("assigned node: %s\n\n", joinNodeId(servers))
}
}
}