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@ -9,6 +9,7 @@ import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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@ -21,14 +22,14 @@ import (
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// ElementType is the type of elements of a Parameter.
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type ElementType int
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// RPC error message.
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const (
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// AlreadyInitialized is true if pserver is initialized
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AlreadyInitialized = "pserver already initialized"
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// Uninitialized is true if pserver not fully initialized
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Uninitialized = "pserver not fully initialized"
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AlreadyInitialized = "pserver already initialized"
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Uninitialized = "pserver not fully initialized"
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CheckpointMD5Failed = "checkpoint file MD5 validation failed"
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)
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// Supported element types
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// Supported element types.
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const (
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Int32 ElementType = iota
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UInt32
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@ -51,21 +52,15 @@ type ParameterWithConfig struct {
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Config []byte // parameter configuration in Proto Buffer format
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}
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// ParameterCheckpoint is Parameter and State checkpoint
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type ParameterCheckpoint struct {
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ParamConfig ParameterWithConfig
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State []byte
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}
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// checkpoint signature
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// checkpointMeta saves checkpoint metadata
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type checkpointMeta struct {
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UUID string `json:"uuid"`
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Md5sum string `json:"md5sum"`
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Timestamp string `json:"timestamp"`
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MD5 string `json:"md5"`
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Timestamp int64 `json:"timestamp"`
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}
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// Checkpoint is the pserver shard persist in file
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type Checkpoint []ParameterCheckpoint
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type Checkpoint []parameterCheckpoint
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// Gradient is the gradient of the parameter.
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type Gradient Parameter
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@ -81,12 +76,53 @@ type Service struct {
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optMap map[string]*optimizer
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}
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// parameterCheckpoint saves parameter checkpoint
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type parameterCheckpoint struct {
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ParameterWithConfig
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State []byte
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}
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// NewCheckpointFromFile loads parameters and state from checkpoint file
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func NewCheckpointFromFile(cpPath string, idx int, e *EtcdClient) (*Checkpoint, error) {
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v, err := e.GetKey(PsPath+string(idx), 3*time.Second)
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if err != nil {
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return nil, err
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}
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var cpMeta checkpointMeta
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if err = json.Unmarshal(v, &cpMeta); err != nil {
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return nil, err
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}
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fn := filepath.Join(cpPath, cpMeta.UUID)
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if _, err = os.Stat(fn); os.IsNotExist(err) {
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return nil, err
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}
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content, err := ioutil.ReadFile(fn)
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if err != nil {
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return nil, err
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}
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h := md5.New()
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md5 := hex.EncodeToString(h.Sum(content))
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if md5 != cpMeta.MD5 {
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return nil, errors.New(CheckpointMD5Failed)
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}
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dec := gob.NewDecoder(bytes.NewReader(content))
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cp := &Checkpoint{}
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if err = dec.Decode(cp); err != nil {
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return nil, err
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}
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return cp, nil
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}
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// NewService creates a new service, will bypass etcd registration if no
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// endpoints specified.
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func NewService(idx int, seconds int, path string, client *EtcdClient, cp Checkpoint) (*Service, error) {
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// endpoints specified. It will recovery from checkpoint file if a exists a specified checkpoint.
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func NewService(idx int, interval time.Duration, path string, client *EtcdClient, cp *Checkpoint) (*Service, error) {
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s := &Service{
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idx: idx,
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checkpointInterval: time.Second * time.Duration(seconds),
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checkpointInterval: interval,
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checkpointPath: path,
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client: client,
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}
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@ -94,10 +130,12 @@ func NewService(idx int, seconds int, path string, client *EtcdClient, cp Checkp
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s.initialized = make(chan struct{})
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if cp != nil {
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for _, item := range cp {
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p := item.ParamConfig
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st := item.State
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s.optMap[p.Param.Name] = newOptimizer(p, st)
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for _, item := range *cp {
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p := ParameterWithConfig{
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Param: item.Param,
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Config: item.Config,
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}
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s.optMap[p.Param.Name] = newOptimizer(p, item.State)
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}
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}
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return s, nil
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@ -186,13 +224,13 @@ func (s *Service) doCheckpoint() error {
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s.mu.Lock()
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defer s.mu.Unlock()
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cp := make([]ParameterCheckpoint, 0, len(s.optMap))
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cp := make([]parameterCheckpoint, len(s.optMap))
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index := 0
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for name, opt := range s.optMap {
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var pc ParameterCheckpoint
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pc.ParamConfig.Param.Name = name
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pc.ParamConfig.Param.ElementType = opt.elementType
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pc.ParamConfig.Param.Content = opt.GetWeights()
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var pc parameterCheckpoint
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pc.Param.Name = name
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pc.Param.ElementType = opt.elementType
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pc.Param.Content = opt.GetWeights()
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pc.State = opt.GetStates()
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cp[index] = pc
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index++
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@ -206,12 +244,12 @@ func (s *Service) doCheckpoint() error {
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cpMeta := checkpointMeta{}
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cpMeta.UUID = s.checkpointPath + strconv.Itoa(s.idx)
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cpMeta.Timestamp = time.Now().String()
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cpMeta.Timestamp = time.Now().UnixNano()
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h := md5.New()
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cpMeta.Md5sum = hex.EncodeToString(h.Sum(buf.Bytes()))
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cpMeta.MD5 = hex.EncodeToString(h.Sum(buf.Bytes()))
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cpMetajson, _ := json.Marshal(cpMeta)
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err = s.client.PutKey(filepath.Join(PsCheckpoint, strconv.Itoa(s.idx)), cpMetajson, 3)
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err = s.client.PutKey(filepath.Join(PsCheckpoint, strconv.Itoa(s.idx)), cpMetajson, 3*time.Second)
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if err != nil {
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return err
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}
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@ -219,7 +257,11 @@ func (s *Service) doCheckpoint() error {
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log.Info("checkpoint does not exists.")
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} else {
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err = os.Remove(cpMeta.UUID)
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log.Infof("checkpoint %s already exsits, removing ", cpMeta.UUID)
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if err != nil {
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log.Infof("Removing checkpoint %s failed", cpMeta.UUID)
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} else {
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log.Infof("checkpoint %s already exsits, removing ", cpMeta.UUID)
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}
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}
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f, err := os.Create(cpMeta.UUID)
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defer f.Close()
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qijun
8 years ago