package topology import ( "errors" "fmt" "math/rand" "sync" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/storage" ) // mapping from volume to its locations, inverted from server to volume type VolumeLayout struct { rp *storage.ReplicaPlacement ttl *storage.TTL vid2location map[storage.VolumeId]*VolumeLocationList writables []storage.VolumeId // transient array of writable volume id volumeSizeLimit uint64 accessLock sync.RWMutex } func NewVolumeLayout(rp *storage.ReplicaPlacement, ttl *storage.TTL, volumeSizeLimit uint64) *VolumeLayout { return &VolumeLayout{ rp: rp, ttl: ttl, vid2location: make(map[storage.VolumeId]*VolumeLocationList), writables: *new([]storage.VolumeId), volumeSizeLimit: volumeSizeLimit, } } func (vl *VolumeLayout) String() string { return fmt.Sprintf("rp:%v, ttl:%v, vid2location:%v, writables:%v, volumeSizeLimit:%v", vl.rp, vl.ttl, vl.vid2location, vl.writables, vl.volumeSizeLimit) } func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) { vl.accessLock.Lock() defer vl.accessLock.Unlock() if _, ok := vl.vid2location[v.Id]; !ok { vl.vid2location[v.Id] = NewVolumeLocationList() } vl.vid2location[v.Id].Set(dn) glog.V(4).Infoln("volume", v.Id, "added to dn", dn.Id(), "len", vl.vid2location[v.Id].Length(), "copy", v.ReplicaPlacement.GetCopyCount()) if vl.vid2location[v.Id].Length() == vl.rp.GetCopyCount() && vl.isWritable(v) { vl.addToWritable(v.Id) } else { vl.removeFromWritable(v.Id) } } func (vl *VolumeLayout) UnRegisterVolume(v *storage.VolumeInfo, dn *DataNode) { vl.accessLock.Lock() defer vl.accessLock.Unlock() vl.removeFromWritable(v.Id) delete(vl.vid2location, v.Id) } func (vl *VolumeLayout) addToWritable(vid storage.VolumeId) { for _, id := range vl.writables { if vid == id { return } } vl.writables = append(vl.writables, vid) } func (vl *VolumeLayout) isWritable(v *storage.VolumeInfo) bool { return uint64(v.Size) < vl.volumeSizeLimit && v.Version == storage.CurrentVersion && !v.ReadOnly } func (vl *VolumeLayout) Lookup(vid storage.VolumeId) []*DataNode { vl.accessLock.RLock() defer vl.accessLock.RUnlock() if location := vl.vid2location[vid]; location != nil { return location.list } return nil } func (vl *VolumeLayout) ListVolumeServers() (nodes []*DataNode) { vl.accessLock.RLock() defer vl.accessLock.RUnlock() for _, location := range vl.vid2location { nodes = append(nodes, location.list...) } return } func (vl *VolumeLayout) PickForWrite(count uint64, option *VolumeGrowOption) (*storage.VolumeId, uint64, *VolumeLocationList, error) { vl.accessLock.RLock() defer vl.accessLock.RUnlock() len_writers := len(vl.writables) if len_writers <= 0 { glog.V(0).Infoln("No more writable volumes!") return nil, 0, nil, errors.New("No more writable volumes!") } if option.DataCenter == "" { vid := vl.writables[rand.Intn(len_writers)] locationList := vl.vid2location[vid] if locationList != nil { return &vid, count, locationList, nil } return nil, 0, nil, errors.New("Strangely vid " + vid.String() + " is on no machine!") } var vid storage.VolumeId var locationList *VolumeLocationList counter := 0 for _, v := range vl.writables { volumeLocationList := vl.vid2location[v] for _, dn := range volumeLocationList.list { if dn.GetDataCenter().Id() == NodeId(option.DataCenter) { if option.Rack != "" && dn.GetRack().Id() != NodeId(option.Rack) { continue } if option.DataNode != "" && dn.Id() != NodeId(option.DataNode) { continue } counter++ if rand.Intn(counter) < 1 { vid, locationList = v, volumeLocationList } } } } return &vid, count, locationList, nil } func (vl *VolumeLayout) GetActiveVolumeCount(option *VolumeGrowOption) int { vl.accessLock.RLock() defer vl.accessLock.RUnlock() if option.DataCenter == "" { return len(vl.writables) } counter := 0 for _, v := range vl.writables { for _, dn := range vl.vid2location[v].list { if dn.GetDataCenter().Id() == NodeId(option.DataCenter) { if option.Rack != "" && dn.GetRack().Id() != NodeId(option.Rack) { continue } if option.DataNode != "" && dn.Id() != NodeId(option.DataNode) { continue } counter++ } } } return counter } func (vl *VolumeLayout) removeFromWritable(vid storage.VolumeId) bool { toDeleteIndex := -1 for k, id := range vl.writables { if id == vid { toDeleteIndex = k break } } if toDeleteIndex >= 0 { glog.V(0).Infoln("Volume", vid, "becomes unwritable") vl.writables = append(vl.writables[0:toDeleteIndex], vl.writables[toDeleteIndex+1:]...) return true } return false } func (vl *VolumeLayout) setVolumeWritable(vid storage.VolumeId) bool { for _, v := range vl.writables { if v == vid { return false } } glog.V(0).Infoln("Volume", vid, "becomes writable") vl.writables = append(vl.writables, vid) return true } func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid storage.VolumeId) bool { vl.accessLock.Lock() defer vl.accessLock.Unlock() if location, ok := vl.vid2location[vid]; ok { if location.Remove(dn) { if location.Length() < vl.rp.GetCopyCount() { glog.V(0).Infoln("Volume", vid, "has", location.Length(), "replica, less than required", vl.rp.GetCopyCount()) return vl.removeFromWritable(vid) } } } return false } func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid storage.VolumeId) bool { vl.accessLock.Lock() defer vl.accessLock.Unlock() vl.vid2location[vid].Set(dn) if vl.vid2location[vid].Length() >= vl.rp.GetCopyCount() { return vl.setVolumeWritable(vid) } return false } func (vl *VolumeLayout) SetVolumeCapacityFull(vid storage.VolumeId) bool { vl.accessLock.Lock() defer vl.accessLock.Unlock() // glog.V(0).Infoln("Volume", vid, "reaches full capacity.") return vl.removeFromWritable(vid) } func (vl *VolumeLayout) ToMap() map[string]interface{} { m := make(map[string]interface{}) m["replication"] = vl.rp.String() m["ttl"] = vl.ttl.String() m["writables"] = vl.writables //m["locations"] = vl.vid2location return m }