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140 lines
4.2 KiB
140 lines
4.2 KiB
package topology
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import (
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"code.google.com/p/weed-fs/go/glog"
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"code.google.com/p/weed-fs/go/sequence"
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"code.google.com/p/weed-fs/go/storage"
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"errors"
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"io/ioutil"
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"math/rand"
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)
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type Topology struct {
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NodeImpl
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//transient vid~servers mapping for each replication type
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replicaType2VolumeLayout []*VolumeLayout
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pulse int64
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volumeSizeLimit uint64
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sequence sequence.Sequencer
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chanDeadDataNodes chan *DataNode
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chanRecoveredDataNodes chan *DataNode
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chanFullVolumes chan storage.VolumeInfo
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configuration *Configuration
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}
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func NewTopology(id string, confFile string, dirname string, sequenceFilename string, volumeSizeLimit uint64, pulse int) (*Topology, error) {
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t := &Topology{}
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t.id = NodeId(id)
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t.nodeType = "Topology"
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t.NodeImpl.value = t
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t.children = make(map[NodeId]Node)
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t.replicaType2VolumeLayout = make([]*VolumeLayout, storage.LengthRelicationType)
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t.pulse = int64(pulse)
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t.volumeSizeLimit = volumeSizeLimit
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t.sequence = sequence.NewSequencer(dirname, sequenceFilename)
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t.chanDeadDataNodes = make(chan *DataNode)
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t.chanRecoveredDataNodes = make(chan *DataNode)
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t.chanFullVolumes = make(chan storage.VolumeInfo)
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err := t.loadConfiguration(confFile)
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return t, err
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}
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func (t *Topology) loadConfiguration(configurationFile string) error {
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b, e := ioutil.ReadFile(configurationFile)
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if e == nil {
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t.configuration, e = NewConfiguration(b)
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return e
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} else {
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glog.V(0).Infoln("Using default configurations.")
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}
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return nil
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}
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func (t *Topology) Lookup(vid storage.VolumeId) []*DataNode {
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for _, vl := range t.replicaType2VolumeLayout {
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if vl != nil {
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if list := vl.Lookup(vid); list != nil {
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return list
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}
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}
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}
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return nil
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}
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func (t *Topology) RandomlyReserveOneVolume(dataCenter string) (bool, *DataNode, *storage.VolumeId) {
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if t.FreeSpace() <= 0 {
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glog.V(0).Infoln("Topology does not have free space left!")
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return false, nil, nil
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}
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vid := t.NextVolumeId()
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ret, node := t.ReserveOneVolume(rand.Intn(t.FreeSpace()), vid, dataCenter)
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return ret, node, &vid
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}
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func (t *Topology) NextVolumeId() storage.VolumeId {
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vid := t.GetMaxVolumeId()
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return vid.Next()
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}
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func (t *Topology) PickForWrite(repType storage.ReplicationType, count int, dataCenter string) (string, int, *DataNode, error) {
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replicationTypeIndex := repType.GetReplicationLevelIndex()
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if t.replicaType2VolumeLayout[replicationTypeIndex] == nil {
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t.replicaType2VolumeLayout[replicationTypeIndex] = NewVolumeLayout(repType, t.volumeSizeLimit, t.pulse)
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}
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vid, count, datanodes, err := t.replicaType2VolumeLayout[replicationTypeIndex].PickForWrite(count, dataCenter)
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if err != nil || datanodes.Length() == 0 {
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return "", 0, nil, errors.New("No writable volumes avalable!")
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}
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fileId, count := t.sequence.NextFileId(count)
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return storage.NewFileId(*vid, fileId, rand.Uint32()).String(), count, datanodes.Head(), nil
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}
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func (t *Topology) GetVolumeLayout(repType storage.ReplicationType) *VolumeLayout {
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replicationTypeIndex := repType.GetReplicationLevelIndex()
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if t.replicaType2VolumeLayout[replicationTypeIndex] == nil {
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glog.V(0).Infoln("adding replication type", repType)
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t.replicaType2VolumeLayout[replicationTypeIndex] = NewVolumeLayout(repType, t.volumeSizeLimit, t.pulse)
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}
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return t.replicaType2VolumeLayout[replicationTypeIndex]
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}
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func (t *Topology) RegisterVolumeLayout(v *storage.VolumeInfo, dn *DataNode) {
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t.GetVolumeLayout(v.RepType).RegisterVolume(v, dn)
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}
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func (t *Topology) RegisterVolumes(init bool, volumeInfos []storage.VolumeInfo, ip string, port int, publicUrl string, maxVolumeCount int, dcName string, rackName string) {
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dcName, rackName = t.configuration.Locate(ip, dcName, rackName)
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dc := t.GetOrCreateDataCenter(dcName)
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rack := dc.GetOrCreateRack(rackName)
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dn := rack.FindDataNode(ip, port)
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if init && dn != nil {
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t.UnRegisterDataNode(dn)
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}
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dn = rack.GetOrCreateDataNode(ip, port, publicUrl, maxVolumeCount)
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for _, v := range volumeInfos {
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dn.AddOrUpdateVolume(v)
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t.RegisterVolumeLayout(&v, dn)
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}
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}
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func (t *Topology) GetOrCreateDataCenter(dcName string) *DataCenter {
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for _, c := range t.Children() {
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dc := c.(*DataCenter)
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if string(dc.Id()) == dcName {
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return dc
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}
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}
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dc := NewDataCenter(dcName)
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t.LinkChildNode(dc)
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return dc
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}
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