Пример #1
0
func distributedOperation(masterNode string, store *storage.Store, volumeId storage.VolumeId, op func(location operation.Location) bool) bool {
	collection := ""
	if v := store.GetVolume(volumeId); v != nil {
		collection = v.Collection
	}
	if lookupResult, lookupErr := operation.LookupNoCache(masterNode, volumeId.String(), collection); lookupErr == nil {
		length := 0
		selfUrl := net.JoinHostPort(store.GetIP(), strconv.Itoa(store.Port))
		results := make(chan bool)
		for _, location := range lookupResult.Locations {
			if location.Url != selfUrl {
				length++
				go func(location operation.Location, results chan bool) {
					results <- op(location)
				}(location, results)
			}
		}
		ret := true
		for i := 0; i < length; i++ {
			ret = ret && <-results
		}
		if rp := store.GetVolumeReplicaPlacement(volumeId); rp != nil {
			if length+1 < rp.GetCopyCount() {
				glog.V(0).Infof("replicating opetations [%d] is less than volume's replication copy count [%d]", length+1, rp.GetCopyCount())
				ret = false
			}
		}
		return ret
	} else {
		glog.V(0).Infoln("Failed to lookup for", volumeId, lookupErr.Error())
	}
	return false
}
Пример #2
0
func ReplicatedDelete(masterNode string, store *storage.Store,
	volumeId storage.VolumeId, n *storage.Needle,
	r *http.Request) (uint32, error) {

	//check JWT
	jwt := security.GetJwt(r)

	ret, err := store.Delete(volumeId, n)
	if err != nil {
		glog.V(0).Infoln("delete error:", err)
		return ret, err
	}

	needToReplicate := !store.HasVolume(volumeId)
	if !needToReplicate && ret > 0 {
		needToReplicate = store.GetVolume(volumeId).NeedToReplicate()
	}
	if needToReplicate { //send to other replica locations
		if r.FormValue("type") != "replicate" {
			if err = distributedOperation(masterNode, store, volumeId, func(location operation.Location) error {
				return util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", jwt)
			}); err != nil {
				ret = 0
			}
		}
	}
	return ret, err
}
Пример #3
0
func distributedOperation(masterNode string, store *storage.Store, volumeId storage.VolumeId, op func(location operation.Location) error) error {
	if lookupResult, lookupErr := operation.Lookup(masterNode, volumeId.String()); lookupErr == nil {
		length := 0
		selfUrl := (store.Ip + ":" + strconv.Itoa(store.Port))
		results := make(chan RemoteResult)
		for _, location := range lookupResult.Locations {
			if location.Url != selfUrl {
				length++
				go func(location operation.Location, results chan RemoteResult) {
					results <- RemoteResult{location.Url, op(location)}
				}(location, results)
			}
		}
		ret := DistributedOperationResult(make(map[string]error))
		for i := 0; i < length; i++ {
			result := <-results
			ret[result.Host] = result.Error
		}
		if volume := store.GetVolume(volumeId); volume != nil {
			if length+1 < volume.ReplicaPlacement.GetCopyCount() {
				return fmt.Errorf("replicating opetations [%d] is less than volume's replication copy count [%d]", length+1, volume.ReplicaPlacement.GetCopyCount())
			}
		}
		return ret.Error()
	} else {
		glog.V(0).Infoln()
		return fmt.Errorf("Failed to lookup for %d: %v", volumeId, lookupErr)
	}
	return nil
}
Пример #4
0
func ReplicatedWrite(masterNode string, s *storage.Store,
	volumeId storage.VolumeId, needle *storage.Needle,
	r *http.Request) (size uint32, errorStatus string) {

	//check JWT
	jwt := security.GetJwt(r)

	ret, err := s.Write(volumeId, needle)
	needToReplicate := !s.HasVolume(volumeId)
	if err != nil {
		errorStatus = "Failed to write to local disk (" + err.Error() + ")"
	} else if ret > 0 {
		needToReplicate = needToReplicate || s.GetVolume(volumeId).NeedToReplicate()
	} else {
		errorStatus = "Failed to write to local disk"
	}
	if !needToReplicate && ret > 0 {
		needToReplicate = s.GetVolume(volumeId).NeedToReplicate()
	}
	if needToReplicate { //send to other replica locations
		if r.FormValue("type") != "replicate" {

			if err = distributedOperation(masterNode, s, volumeId, func(location operation.Location) error {
				u := url.URL{
					Scheme: "http",
					Host:   location.Url,
					Path:   r.URL.Path,
				}
				q := url.Values{
					"type": {"replicate"},
				}
				if needle.LastModified > 0 {
					q.Set("ts", strconv.FormatUint(needle.LastModified, 10))
				}
				if needle.IsChunkedManifest() {
					q.Set("cm", "true")
				}
				u.RawQuery = q.Encode()
				_, err := operation.Upload(u.String(),
					string(needle.Name), bytes.NewReader(needle.Data), needle.IsGzipped(), string(needle.Mime),
					jwt)
				return err
			}); err != nil {
				ret = 0
				errorStatus = fmt.Sprintf("Failed to write to replicas for volume %d: %v", volumeId, err)
			}
		}
	}
	size = ret
	return
}