mirror of
https://github.com/seaweedfs/seaweedfs.git
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267 lines
8.2 KiB
Go
267 lines
8.2 KiB
Go
package weed_server
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import (
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"context"
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"fmt"
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"io"
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"math"
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"os"
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"path"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/operation"
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"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
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"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/storage/erasure_coding"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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const BufferSizeLimit = 1024 * 1024 * 2
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// VolumeCopy copy the .idx .dat files, and mount the volume
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func (vs *VolumeServer) VolumeCopy(ctx context.Context, req *volume_server_pb.VolumeCopyRequest) (*volume_server_pb.VolumeCopyResponse, error) {
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v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
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if v != nil {
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return nil, fmt.Errorf("volume %d already exists", req.VolumeId)
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}
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location := vs.store.FindFreeLocation()
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if location == nil {
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return nil, fmt.Errorf("no space left")
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}
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// the master will not start compaction for read-only volumes, so it is safe to just copy files directly
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// copy .dat and .idx files
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// read .idx .dat file size and timestamp
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// send .idx file
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// send .dat file
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// confirm size and timestamp
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var volFileInfoResp *volume_server_pb.ReadVolumeFileStatusResponse
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var volumeFileName, idxFileName, datFileName string
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err := operation.WithVolumeServerClient(req.SourceDataNode, vs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
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var err error
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volFileInfoResp, err = client.ReadVolumeFileStatus(ctx,
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&volume_server_pb.ReadVolumeFileStatusRequest{
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VolumeId: req.VolumeId,
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})
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if nil != err {
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return fmt.Errorf("read volume file status failed, %v", err)
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}
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volumeFileName = storage.VolumeFileName(location.Directory, volFileInfoResp.Collection, int(req.VolumeId))
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// println("source:", volFileInfoResp.String())
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// copy ecx file
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if err := vs.doCopyFile(ctx, client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.IdxFileSize, volumeFileName, ".idx", false, false); err != nil {
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return err
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}
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if err := vs.doCopyFile(ctx, client, false, req.Collection, req.VolumeId, volFileInfoResp.CompactionRevision, volFileInfoResp.DatFileSize, volumeFileName, ".dat", false, true); err != nil {
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return err
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}
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return nil
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})
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idxFileName = volumeFileName + ".idx"
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datFileName = volumeFileName + ".dat"
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if err != nil && volumeFileName != "" {
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if idxFileName != "" {
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os.Remove(idxFileName)
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}
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if datFileName != "" {
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os.Remove(datFileName)
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}
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return nil, err
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}
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if err = checkCopyFiles(volFileInfoResp, idxFileName, datFileName); err != nil { // added by panyc16
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return nil, err
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}
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// mount the volume
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err = vs.store.MountVolume(needle.VolumeId(req.VolumeId))
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if err != nil {
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return nil, fmt.Errorf("failed to mount volume %d: %v", req.VolumeId, err)
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}
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return &volume_server_pb.VolumeCopyResponse{
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LastAppendAtNs: volFileInfoResp.DatFileTimestampSeconds * uint64(time.Second),
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}, err
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}
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func (vs *VolumeServer) doCopyFile(ctx context.Context, client volume_server_pb.VolumeServerClient, isEcVolume bool, collection string, vid uint32,
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compactRevision uint32, stopOffset uint64, baseFileName, ext string, isAppend bool, ignoreSourceFileNotFound bool) error {
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copyFileClient, err := client.CopyFile(ctx, &volume_server_pb.CopyFileRequest{
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VolumeId: vid,
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Ext: ext,
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CompactionRevision: compactRevision,
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StopOffset: stopOffset,
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Collection: collection,
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IsEcVolume: isEcVolume,
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IgnoreSourceFileNotFound: ignoreSourceFileNotFound,
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})
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if err != nil {
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return fmt.Errorf("failed to start copying volume %d %s file: %v", vid, ext, err)
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}
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err = writeToFile(copyFileClient, baseFileName+ext, util.NewWriteThrottler(vs.compactionBytePerSecond), isAppend)
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if err != nil {
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return fmt.Errorf("failed to copy %s file: %v", baseFileName+ext, err)
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}
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return nil
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}
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/**
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only check the the differ of the file size
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todo: maybe should check the received count and deleted count of the volume
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*/
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func checkCopyFiles(originFileInf *volume_server_pb.ReadVolumeFileStatusResponse, idxFileName, datFileName string) error {
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stat, err := os.Stat(idxFileName)
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if err != nil {
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return fmt.Errorf("stat idx file %s failed, %v", idxFileName, err)
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}
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if originFileInf.IdxFileSize != uint64(stat.Size()) {
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return fmt.Errorf("idx file %s size [%v] is not same as origin file size [%v]",
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idxFileName, stat.Size(), originFileInf.IdxFileSize)
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}
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stat, err = os.Stat(datFileName)
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if err != nil {
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return fmt.Errorf("get dat file info failed, %v", err)
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}
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if originFileInf.DatFileSize != uint64(stat.Size()) {
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return fmt.Errorf("the dat file size [%v] is not same as origin file size [%v]",
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stat.Size(), originFileInf.DatFileSize)
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}
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return nil
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}
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func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName string, wt *util.WriteThrottler, isAppend bool) error {
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glog.V(4).Infof("writing to %s", fileName)
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flags := os.O_WRONLY | os.O_CREATE | os.O_TRUNC
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if isAppend {
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flags = os.O_WRONLY | os.O_CREATE
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}
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dst, err := os.OpenFile(fileName, flags, 0644)
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if err != nil {
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return nil
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}
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defer dst.Close()
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for {
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resp, receiveErr := client.Recv()
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if receiveErr == io.EOF {
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break
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}
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if receiveErr != nil {
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return fmt.Errorf("receiving %s: %v", fileName, receiveErr)
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}
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dst.Write(resp.FileContent)
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wt.MaybeSlowdown(int64(len(resp.FileContent)))
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}
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return nil
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}
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func (vs *VolumeServer) ReadVolumeFileStatus(ctx context.Context, req *volume_server_pb.ReadVolumeFileStatusRequest) (*volume_server_pb.ReadVolumeFileStatusResponse, error) {
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resp := &volume_server_pb.ReadVolumeFileStatusResponse{}
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v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
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if v == nil {
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return nil, fmt.Errorf("not found volume id %d", req.VolumeId)
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}
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resp.VolumeId = req.VolumeId
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datSize, idxSize, modTime := v.FileStat()
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resp.DatFileSize = datSize
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resp.IdxFileSize = idxSize
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resp.DatFileTimestampSeconds = uint64(modTime.Unix())
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resp.IdxFileTimestampSeconds = uint64(modTime.Unix())
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resp.FileCount = v.FileCount()
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resp.CompactionRevision = uint32(v.CompactionRevision)
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resp.Collection = v.Collection
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return resp, nil
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}
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// CopyFile client pulls the volume related file from the source server.
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// if req.CompactionRevision != math.MaxUint32, it ensures the compact revision is as expected
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// The copying still stop at req.StopOffset, but you can set it to math.MaxUint64 in order to read all data.
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func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream volume_server_pb.VolumeServer_CopyFileServer) error {
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var fileName string
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if !req.IsEcVolume {
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v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
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if v == nil {
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return fmt.Errorf("not found volume id %d", req.VolumeId)
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}
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if uint32(v.CompactionRevision) != req.CompactionRevision && req.CompactionRevision != math.MaxUint32 {
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return fmt.Errorf("volume %d is compacted", req.VolumeId)
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}
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fileName = v.FileName() + req.Ext
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} else {
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baseFileName := erasure_coding.EcShardBaseFileName(req.Collection, int(req.VolumeId)) + req.Ext
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for _, location := range vs.store.Locations {
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tName := path.Join(location.Directory, baseFileName)
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if util.FileExists(tName) {
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fileName = tName
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}
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}
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if fileName == "" {
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if req.IgnoreSourceFileNotFound {
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return nil
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}
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return fmt.Errorf("CopyFile not found ec volume id %d", req.VolumeId)
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}
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}
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bytesToRead := int64(req.StopOffset)
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file, err := os.Open(fileName)
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if err != nil {
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if req.IgnoreSourceFileNotFound && err == os.ErrNotExist {
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return nil
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}
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return err
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}
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defer file.Close()
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buffer := make([]byte, BufferSizeLimit)
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for bytesToRead > 0 {
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bytesread, err := file.Read(buffer)
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// println(fileName, "read", bytesread, "bytes, with target", bytesToRead)
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if err != nil {
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if err != io.EOF {
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return err
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}
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// println(fileName, "read", bytesread, "bytes, with target", bytesToRead, "err", err.Error())
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break
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}
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if int64(bytesread) > bytesToRead {
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bytesread = int(bytesToRead)
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}
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err = stream.Send(&volume_server_pb.CopyFileResponse{
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FileContent: buffer[:bytesread],
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})
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if err != nil {
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// println("sending", bytesread, "bytes err", err.Error())
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return err
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}
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bytesToRead -= int64(bytesread)
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}
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return nil
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}
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