seaweedfs/weed/storage/store.go

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package storage
import (
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"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
)
const (
MAX_TTL_VOLUME_REMOVAL_DELAY = 10 // 10 minutes
)
/*
* A VolumeServer contains one Store
*/
type Store struct {
Ip string
Port int
PublicUrl string
Locations []*DiskLocation
dataCenter string //optional informaton, overwriting master setting if exists
rack string //optional information, overwriting master setting if exists
connected bool
VolumeSizeLimit uint64 //read from the master
Client master_pb.Seaweed_SendHeartbeatClient
NeedleMapType NeedleMapType
NewVolumeIdChan chan VolumeId
DeletedVolumeIdChan chan VolumeId
}
func (s *Store) String() (str string) {
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str = fmt.Sprintf("Ip:%s, Port:%d, PublicUrl:%s, dataCenter:%s, rack:%s, connected:%v, volumeSizeLimit:%d", s.Ip, s.Port, s.PublicUrl, s.dataCenter, s.rack, s.connected, s.VolumeSizeLimit)
return
}
func NewStore(port int, ip, publicUrl string, dirnames []string, maxVolumeCounts []int, needleMapKind NeedleMapType) (s *Store) {
s = &Store{Port: port, Ip: ip, PublicUrl: publicUrl, NeedleMapType: needleMapKind}
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s.Locations = make([]*DiskLocation, 0)
for i := 0; i < len(dirnames); i++ {
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location := NewDiskLocation(dirnames[i], maxVolumeCounts[i])
location.loadExistingVolumes(needleMapKind)
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s.Locations = append(s.Locations, location)
}
s.NewVolumeIdChan = make(chan VolumeId, 3)
s.DeletedVolumeIdChan = make(chan VolumeId, 3)
return
}
func (s *Store) AddVolume(volumeId VolumeId, collection string, needleMapKind NeedleMapType, replicaPlacement string, ttlString string, preallocate int64) error {
rt, e := NewReplicaPlacementFromString(replicaPlacement)
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if e != nil {
return e
}
ttl, e := ReadTTL(ttlString)
if e != nil {
return e
}
e = s.addVolume(volumeId, collection, needleMapKind, rt, ttl, preallocate)
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return e
}
func (s *Store) DeleteCollection(collection string) (e error) {
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for _, location := range s.Locations {
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e = location.DeleteCollectionFromDiskLocation(collection)
if e != nil {
return
}
// let the heartbeat send the list of volumes, instead of sending the deleted volume ids to DeletedVolumeIdChan
}
return
}
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func (s *Store) findVolume(vid VolumeId) *Volume {
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for _, location := range s.Locations {
if v, found := location.FindVolume(vid); found {
return v
}
}
return nil
}
func (s *Store) FindFreeLocation() (ret *DiskLocation) {
max := 0
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for _, location := range s.Locations {
currentFreeCount := location.MaxVolumeCount - location.VolumesLen()
if currentFreeCount > max {
max = currentFreeCount
ret = location
}
}
return ret
}
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func (s *Store) addVolume(vid VolumeId, collection string, needleMapKind NeedleMapType, replicaPlacement *ReplicaPlacement, ttl *TTL, preallocate int64) 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)
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if volume, err := NewVolume(location.Directory, collection, vid, needleMapKind, replicaPlacement, ttl, preallocate); err == nil {
location.SetVolume(vid, volume)
s.NewVolumeIdChan <- vid
return nil
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} else {
return err
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}
}
return fmt.Errorf("No more free space left")
}
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func (s *Store) Status() []*VolumeInfo {
var stats []*VolumeInfo
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for _, location := range s.Locations {
location.RLock()
for k, v := range location.volumes {
s := &VolumeInfo{
Id: VolumeId(k),
Size: v.ContentSize(),
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Collection: v.Collection,
ReplicaPlacement: v.ReplicaPlacement,
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Version: v.Version(),
FileCount: v.nm.FileCount(),
DeleteCount: v.nm.DeletedCount(),
DeletedByteCount: v.nm.DeletedSize(),
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ReadOnly: v.readOnly,
Ttl: v.Ttl,
CompactRevision: uint32(v.CompactRevision),
}
stats = append(stats, s)
}
location.RUnlock()
}
sortVolumeInfos(stats)
return stats
}
func (s *Store) SetDataCenter(dataCenter string) {
s.dataCenter = dataCenter
}
func (s *Store) SetRack(rack string) {
s.rack = rack
}
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func (s *Store) CollectHeartbeat() *master_pb.Heartbeat {
var volumeMessages []*master_pb.VolumeInformationMessage
maxVolumeCount := 0
var maxFileKey NeedleId
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for _, location := range s.Locations {
maxVolumeCount = maxVolumeCount + location.MaxVolumeCount
location.Lock()
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for _, v := range location.volumes {
if maxFileKey < v.nm.MaxFileKey() {
maxFileKey = v.nm.MaxFileKey()
}
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if !v.expired(s.VolumeSizeLimit) {
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volumeMessages = append(volumeMessages, v.ToVolumeInformationMessage())
} else {
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if v.expiredLongEnough(MAX_TTL_VOLUME_REMOVAL_DELAY) {
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location.deleteVolumeById(v.Id)
glog.V(0).Infoln("volume", v.Id, "is deleted.")
} else {
glog.V(0).Infoln("volume", v.Id, "is expired.")
}
}
}
location.Unlock()
}
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return &master_pb.Heartbeat{
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Ip: s.Ip,
Port: uint32(s.Port),
PublicUrl: s.PublicUrl,
MaxVolumeCount: uint32(maxVolumeCount),
MaxFileKey: NeedleIdToUint64(maxFileKey),
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DataCenter: s.dataCenter,
Rack: s.rack,
Volumes: volumeMessages,
}
}
func (s *Store) Close() {
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for _, location := range s.Locations {
location.Close()
}
}
func (s *Store) Write(i VolumeId, n *Needle) (size uint32, err error) {
if v := s.findVolume(i); v != nil {
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if v.readOnly {
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err = fmt.Errorf("Volume %d is read only", i)
return
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}
// TODO: count needle size ahead
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if MaxPossibleVolumeSize >= v.ContentSize()+uint64(size) {
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_, size, err = v.writeNeedle(n)
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} else {
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err = fmt.Errorf("Volume Size Limit %d Exceeded! Current size is %d", s.VolumeSizeLimit, v.ContentSize())
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}
return
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}
glog.V(0).Infoln("volume", i, "not found!")
err = fmt.Errorf("Volume %d not found!", i)
return
}
func (s *Store) Delete(i VolumeId, n *Needle) (uint32, error) {
if v := s.findVolume(i); v != nil && !v.readOnly {
return v.deleteNeedle(n)
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}
return 0, nil
}
func (s *Store) ReadVolumeNeedle(i VolumeId, n *Needle) (int, error) {
if v := s.findVolume(i); v != nil {
return v.readNeedle(n)
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}
return 0, fmt.Errorf("Volume %d not found!", i)
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}
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func (s *Store) GetVolume(i VolumeId) *Volume {
return s.findVolume(i)
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}
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func (s *Store) HasVolume(i VolumeId) bool {
v := s.findVolume(i)
return v != nil
}
func (s *Store) MountVolume(i VolumeId) error {
for _, location := range s.Locations {
if found := location.LoadVolume(i, s.NeedleMapType); found == true {
s.NewVolumeIdChan <- VolumeId(i)
return nil
}
}
return fmt.Errorf("Volume %d not found on disk", i)
}
func (s *Store) UnmountVolume(i VolumeId) error {
for _, location := range s.Locations {
if err := location.UnloadVolume(i); err == nil {
s.DeletedVolumeIdChan <- VolumeId(i)
return nil
}
}
return fmt.Errorf("Volume %d not found on disk", i)
}
func (s *Store) DeleteVolume(i VolumeId) error {
for _, location := range s.Locations {
if error := location.deleteVolumeById(i); error == nil {
s.DeletedVolumeIdChan <- VolumeId(i)
return nil
}
}
return fmt.Errorf("Volume %d not found on disk", i)
}