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437 lines
11 KiB
437 lines
11 KiB
package topology
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import (
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"errors"
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"fmt"
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"math/rand"
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"sync"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/storage/super_block"
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)
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type copyState int
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const (
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noCopies copyState = 0 + iota
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insufficientCopies
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enoughCopies
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)
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type volumeState string
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const (
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readOnlyState volumeState = "ReadOnly"
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oversizedState = "Oversized"
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)
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type stateIndicator func(copyState) bool
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func ExistCopies() stateIndicator {
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return func(state copyState) bool { return state != noCopies }
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}
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func NoCopies() stateIndicator {
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return func(state copyState) bool { return state == noCopies }
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}
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type volumesBinaryState struct {
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rp *super_block.ReplicaPlacement
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name volumeState // the name for volume state (eg. "Readonly", "Oversized")
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indicator stateIndicator // indicate whether the volumes should be marked as `name`
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copyMap map[needle.VolumeId]*VolumeLocationList
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}
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func NewVolumesBinaryState(name volumeState, rp *super_block.ReplicaPlacement, indicator stateIndicator) *volumesBinaryState {
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return &volumesBinaryState{
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rp: rp,
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name: name,
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indicator: indicator,
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copyMap: make(map[needle.VolumeId]*VolumeLocationList),
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}
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}
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func (v *volumesBinaryState) Dump() (res []uint32) {
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for vid, list := range v.copyMap {
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if v.indicator(v.copyState(list)) {
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res = append(res, uint32(vid))
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}
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}
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return
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}
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func (v *volumesBinaryState) IsTrue(vid needle.VolumeId) bool {
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list, _ := v.copyMap[vid]
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return v.indicator(v.copyState(list))
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}
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func (v *volumesBinaryState) Add(vid needle.VolumeId, dn *DataNode) {
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list, _ := v.copyMap[vid]
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if list != nil {
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list.Set(dn)
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return
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}
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list = NewVolumeLocationList()
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list.Set(dn)
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v.copyMap[vid] = list
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}
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func (v *volumesBinaryState) Remove(vid needle.VolumeId, dn *DataNode) {
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list, _ := v.copyMap[vid]
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if list != nil {
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list.Remove(dn)
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if list.Length() == 0 {
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delete(v.copyMap, vid)
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}
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}
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}
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func (v *volumesBinaryState) copyState(list *VolumeLocationList) copyState {
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if list == nil {
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return noCopies
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}
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if list.Length() < v.rp.GetCopyCount() {
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return insufficientCopies
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}
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return enoughCopies
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}
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// mapping from volume to its locations, inverted from server to volume
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type VolumeLayout struct {
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rp *super_block.ReplicaPlacement
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ttl *needle.TTL
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vid2location map[needle.VolumeId]*VolumeLocationList
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writables []needle.VolumeId // transient array of writable volume id
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readonlyVolumes *volumesBinaryState // readonly volumes
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oversizedVolumes *volumesBinaryState // oversized volumes
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volumeSizeLimit uint64
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replicationAsMin bool
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accessLock sync.RWMutex
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}
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type VolumeLayoutStats struct {
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TotalSize uint64
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UsedSize uint64
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FileCount uint64
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}
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func NewVolumeLayout(rp *super_block.ReplicaPlacement, ttl *needle.TTL, volumeSizeLimit uint64, replicationAsMin bool) *VolumeLayout {
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return &VolumeLayout{
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rp: rp,
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ttl: ttl,
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vid2location: make(map[needle.VolumeId]*VolumeLocationList),
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writables: *new([]needle.VolumeId),
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readonlyVolumes: NewVolumesBinaryState(readOnlyState, rp, ExistCopies()),
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oversizedVolumes: NewVolumesBinaryState(oversizedState, rp, ExistCopies()),
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volumeSizeLimit: volumeSizeLimit,
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replicationAsMin: replicationAsMin,
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}
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}
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func (vl *VolumeLayout) String() string {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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return fmt.Sprintf("rp:%v, ttl:%v, vid2location:%v, writables:%v, volumeSizeLimit:%v", vl.rp, vl.ttl, vl.vid2location, vl.writables, vl.volumeSizeLimit)
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}
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func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
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vl.accessLock.Lock()
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defer vl.accessLock.Unlock()
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defer vl.rememberOversizedVolume(v, dn)
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if _, ok := vl.vid2location[v.Id]; !ok {
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vl.vid2location[v.Id] = NewVolumeLocationList()
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}
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vl.vid2location[v.Id].Set(dn)
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// glog.V(4).Infof("volume %d added to %s len %d copy %d", v.Id, dn.Id(), vl.vid2location[v.Id].Length(), v.ReplicaPlacement.GetCopyCount())
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for _, dn := range vl.vid2location[v.Id].list {
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if vInfo, err := dn.GetVolumesById(v.Id); err == nil {
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if vInfo.ReadOnly {
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glog.V(1).Infof("vid %d removed from writable", v.Id)
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vl.removeFromWritable(v.Id)
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vl.readonlyVolumes.Add(v.Id, dn)
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return
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} else {
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vl.readonlyVolumes.Remove(v.Id, dn)
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}
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} else {
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glog.V(1).Infof("vid %d removed from writable", v.Id)
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vl.removeFromWritable(v.Id)
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vl.readonlyVolumes.Remove(v.Id, dn)
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return
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}
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}
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}
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func (vl *VolumeLayout) rememberOversizedVolume(v *storage.VolumeInfo, dn *DataNode) {
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if vl.isOversized(v) {
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vl.oversizedVolumes.Add(v.Id, dn)
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} else {
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vl.oversizedVolumes.Remove(v.Id, dn)
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}
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}
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func (vl *VolumeLayout) UnRegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
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vl.accessLock.Lock()
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defer vl.accessLock.Unlock()
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// remove from vid2location map
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location, ok := vl.vid2location[v.Id]
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if !ok {
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return
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}
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if location.Remove(dn) {
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vl.readonlyVolumes.Remove(v.Id, dn)
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vl.oversizedVolumes.Remove(v.Id, dn)
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vl.ensureCorrectWritables(v.Id)
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if location.Length() == 0 {
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delete(vl.vid2location, v.Id)
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}
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}
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}
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func (vl *VolumeLayout) EnsureCorrectWritables(v *storage.VolumeInfo) {
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vl.accessLock.Lock()
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defer vl.accessLock.Unlock()
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vl.ensureCorrectWritables(v.Id)
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}
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func (vl *VolumeLayout) ensureCorrectWritables(vid needle.VolumeId) {
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if vl.enoughCopies(vid) && vl.isAllWritable(vid) {
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if !vl.oversizedVolumes.IsTrue(vid) {
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vl.setVolumeWritable(vid)
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}
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} else {
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vl.removeFromWritable(vid)
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}
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}
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func (vl *VolumeLayout) isAllWritable(vid needle.VolumeId) bool {
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for _, dn := range vl.vid2location[vid].list {
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if v, getError := dn.GetVolumesById(vid); getError == nil {
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if v.ReadOnly {
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return false
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}
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}
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}
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return true
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}
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func (vl *VolumeLayout) isOversized(v *storage.VolumeInfo) bool {
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return uint64(v.Size) >= vl.volumeSizeLimit
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}
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func (vl *VolumeLayout) isWritable(v *storage.VolumeInfo) bool {
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return !vl.isOversized(v) &&
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v.Version == needle.CurrentVersion &&
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!v.ReadOnly
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}
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func (vl *VolumeLayout) isEmpty() bool {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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return len(vl.vid2location) == 0
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}
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func (vl *VolumeLayout) Lookup(vid needle.VolumeId) []*DataNode {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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if location := vl.vid2location[vid]; location != nil {
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return location.list
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}
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return nil
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}
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func (vl *VolumeLayout) ListVolumeServers() (nodes []*DataNode) {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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for _, location := range vl.vid2location {
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nodes = append(nodes, location.list...)
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}
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return
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}
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func (vl *VolumeLayout) PickForWrite(count uint64, option *VolumeGrowOption) (*needle.VolumeId, uint64, *VolumeLocationList, error) {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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lenWriters := len(vl.writables)
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if lenWriters <= 0 {
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glog.V(0).Infoln("No more writable volumes!")
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return nil, 0, nil, errors.New("No more writable volumes!")
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}
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if option.DataCenter == "" {
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vid := vl.writables[rand.Intn(lenWriters)]
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locationList := vl.vid2location[vid]
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if locationList != nil {
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return &vid, count, locationList, nil
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}
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return nil, 0, nil, errors.New("Strangely vid " + vid.String() + " is on no machine!")
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}
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var vid needle.VolumeId
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var locationList *VolumeLocationList
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counter := 0
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for _, v := range vl.writables {
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volumeLocationList := vl.vid2location[v]
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for _, dn := range volumeLocationList.list {
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if dn.GetDataCenter().Id() == NodeId(option.DataCenter) {
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if option.Rack != "" && dn.GetRack().Id() != NodeId(option.Rack) {
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continue
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}
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if option.DataNode != "" && dn.Id() != NodeId(option.DataNode) {
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continue
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}
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counter++
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if rand.Intn(counter) < 1 {
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vid, locationList = v, volumeLocationList
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}
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}
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}
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}
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return &vid, count, locationList, nil
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}
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func (vl *VolumeLayout) GetActiveVolumeCount(option *VolumeGrowOption) int {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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if option.DataCenter == "" {
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return len(vl.writables)
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}
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counter := 0
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for _, v := range vl.writables {
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for _, dn := range vl.vid2location[v].list {
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if dn.GetDataCenter().Id() == NodeId(option.DataCenter) {
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if option.Rack != "" && dn.GetRack().Id() != NodeId(option.Rack) {
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continue
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}
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if option.DataNode != "" && dn.Id() != NodeId(option.DataNode) {
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continue
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}
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counter++
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}
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}
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}
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return counter
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}
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func (vl *VolumeLayout) removeFromWritable(vid needle.VolumeId) bool {
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toDeleteIndex := -1
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for k, id := range vl.writables {
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if id == vid {
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toDeleteIndex = k
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break
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}
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}
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if toDeleteIndex >= 0 {
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glog.V(0).Infoln("Volume", vid, "becomes unwritable")
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vl.writables = append(vl.writables[0:toDeleteIndex], vl.writables[toDeleteIndex+1:]...)
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return true
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}
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return false
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}
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func (vl *VolumeLayout) setVolumeWritable(vid needle.VolumeId) bool {
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for _, v := range vl.writables {
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if v == vid {
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return false
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}
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}
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glog.V(0).Infoln("Volume", vid, "becomes writable")
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vl.writables = append(vl.writables, vid)
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return true
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}
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func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid needle.VolumeId) bool {
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vl.accessLock.Lock()
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defer vl.accessLock.Unlock()
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if location, ok := vl.vid2location[vid]; ok {
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if location.Remove(dn) {
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vl.readonlyVolumes.Remove(vid, dn)
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vl.oversizedVolumes.Remove(vid, dn)
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if location.Length() < vl.rp.GetCopyCount() {
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glog.V(0).Infoln("Volume", vid, "has", location.Length(), "replica, less than required", vl.rp.GetCopyCount())
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return vl.removeFromWritable(vid)
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}
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}
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}
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return false
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}
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func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid needle.VolumeId, isReadOnly bool) bool {
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vl.accessLock.Lock()
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defer vl.accessLock.Unlock()
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vInfo, err := dn.GetVolumesById(vid)
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if err != nil {
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return false
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}
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vl.vid2location[vid].Set(dn)
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if vInfo.ReadOnly || isReadOnly {
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return false
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}
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if vl.enoughCopies(vid) {
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return vl.setVolumeWritable(vid)
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}
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return false
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}
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func (vl *VolumeLayout) enoughCopies(vid needle.VolumeId) bool {
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locations := vl.vid2location[vid].Length()
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desired := vl.rp.GetCopyCount()
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return locations == desired || (vl.replicationAsMin && locations > desired)
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}
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func (vl *VolumeLayout) SetVolumeCapacityFull(vid needle.VolumeId) bool {
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vl.accessLock.Lock()
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defer vl.accessLock.Unlock()
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// glog.V(0).Infoln("Volume", vid, "reaches full capacity.")
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return vl.removeFromWritable(vid)
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}
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func (vl *VolumeLayout) ToMap() map[string]interface{} {
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m := make(map[string]interface{})
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m["replication"] = vl.rp.String()
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m["ttl"] = vl.ttl.String()
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m["writables"] = vl.writables
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//m["locations"] = vl.vid2location
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return m
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}
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func (vl *VolumeLayout) Stats() *VolumeLayoutStats {
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vl.accessLock.RLock()
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defer vl.accessLock.RUnlock()
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ret := &VolumeLayoutStats{}
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freshThreshold := time.Now().Unix() - 60
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for vid, vll := range vl.vid2location {
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size, fileCount := vll.Stats(vid, freshThreshold)
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ret.FileCount += uint64(fileCount)
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ret.UsedSize += size
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if vl.readonlyVolumes.IsTrue(vid) {
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ret.TotalSize += size
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} else {
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ret.TotalSize += vl.volumeSizeLimit
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}
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}
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return ret
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}
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