seaweedfs/weed/server/volume_grpc_copy.go

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package weed_server
import (
"context"
"fmt"
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"io"
"os"
"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/operation"
"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
)
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// VolumeCopy copy the .idx .dat files, and mount the volume
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))
if v != nil {
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return nil, fmt.Errorf("volume %d already exists", req.VolumeId)
}
location := vs.store.FindFreeLocation()
if location == nil {
return nil, fmt.Errorf("no space left")
}
// the master will not start compaction for read-only volumes, so it is safe to just copy files directly
// copy .dat and .idx files
// read .idx .dat file size and timestamp
// send .idx file
// send .dat file
// confirm size and timestamp
var volFileInfoResp *volume_server_pb.ReadVolumeFileStatusResponse
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var volumeFileName, idxFileName, datFileName string
err := operation.WithVolumeServerClient(req.SourceDataNode, vs.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
var err error
volFileInfoResp, err = client.ReadVolumeFileStatus(ctx,
&volume_server_pb.ReadVolumeFileStatusRequest{
VolumeId: req.VolumeId,
})
if nil != err {
return fmt.Errorf("read volume file status failed, %v", err)
}
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volumeFileName = storage.VolumeFileName(volFileInfoResp.Collection, location.Directory, int(req.VolumeId))
// println("source:", volFileInfoResp.String())
copyFileClient, err := client.CopyFile(ctx, &volume_server_pb.CopyFileRequest{
VolumeId: req.VolumeId,
IsIdxFile: true,
CompactionRevision: volFileInfoResp.CompactionRevision,
StopOffset: volFileInfoResp.IdxFileSize,
})
if err != nil {
return fmt.Errorf("failed to start copying volume %d idx file: %v", req.VolumeId, err)
}
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idxFileName = volumeFileName + ".idx"
err = writeToFile(copyFileClient, idxFileName)
if err != nil {
return fmt.Errorf("failed to copy volume %d idx file: %v", req.VolumeId, err)
}
copyFileClient, err = client.CopyFile(ctx, &volume_server_pb.CopyFileRequest{
VolumeId: req.VolumeId,
IsDatFile: true,
CompactionRevision: volFileInfoResp.CompactionRevision,
StopOffset: volFileInfoResp.DatFileSize,
})
if err != nil {
return fmt.Errorf("failed to start copying volume %d dat file: %v", req.VolumeId, err)
}
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datFileName = volumeFileName + ".dat"
err = writeToFile(copyFileClient, datFileName)
if err != nil {
return fmt.Errorf("failed to copy volume %d dat file: %v", req.VolumeId, err)
}
return nil
})
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if err != nil && volumeFileName != "" {
if idxFileName != "" {
os.Remove(idxFileName)
}
if datFileName != "" {
os.Remove(datFileName)
}
return nil, err
}
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if err = checkCopyFiles(volFileInfoResp, idxFileName, datFileName); err != nil { // added by panyc16
return nil, err
}
// mount the volume
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err = vs.store.MountVolume(needle.VolumeId(req.VolumeId))
if err != nil {
return nil, fmt.Errorf("failed to mount volume %d: %v", req.VolumeId, err)
}
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return &volume_server_pb.VolumeCopyResponse{
LastAppendAtNs: volFileInfoResp.DatFileTimestampSeconds * uint64(time.Second),
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}, err
}
/**
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only check the the differ of the file size
todo: maybe should check the received count and deleted count of the volume
*/
func checkCopyFiles(originFileInf *volume_server_pb.ReadVolumeFileStatusResponse, idxFileName, datFileName string) error {
stat, err := os.Stat(idxFileName)
if err != nil {
return fmt.Errorf("get idx file info failed, %v", err)
}
if originFileInf.IdxFileSize != uint64(stat.Size()) {
return fmt.Errorf("the idx file size [%v] is not same as origin file size [%v]",
stat.Size(), originFileInf.IdxFileSize)
}
stat, err = os.Stat(datFileName)
if err != nil {
return fmt.Errorf("get dat file info failed, %v", err)
}
if originFileInf.DatFileSize != uint64(stat.Size()) {
return fmt.Errorf("the dat file size [%v] is not same as origin file size [%v]",
stat.Size(), originFileInf.DatFileSize)
}
return nil
}
func writeToFile(client volume_server_pb.VolumeServer_CopyFileClient, fileName string) error {
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glog.V(4).Infof("writing to %s", fileName)
dst, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return nil
}
defer dst.Close()
for {
resp, receiveErr := client.Recv()
if receiveErr == io.EOF {
break
}
if receiveErr != nil {
return fmt.Errorf("receiving %s: %v", fileName, receiveErr)
}
dst.Write(resp.FileContent)
}
return nil
}
func (vs *VolumeServer) ReadVolumeFileStatus(ctx context.Context, req *volume_server_pb.ReadVolumeFileStatusRequest) (*volume_server_pb.ReadVolumeFileStatusResponse, error) {
resp := &volume_server_pb.ReadVolumeFileStatusResponse{}
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v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
if v == nil {
return nil, fmt.Errorf("not found volume id %d", req.VolumeId)
}
resp.VolumeId = req.VolumeId
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datSize, idxSize, modTime := v.FileStat()
resp.DatFileSize = datSize
resp.IdxFileSize = idxSize
resp.DatFileTimestampSeconds = uint64(modTime.Unix())
resp.IdxFileTimestampSeconds = uint64(modTime.Unix())
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resp.FileCount = v.FileCount()
resp.CompactionRevision = uint32(v.CompactionRevision)
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resp.Collection = v.Collection
return resp, nil
}
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func (vs *VolumeServer) CopyFile(req *volume_server_pb.CopyFileRequest, stream volume_server_pb.VolumeServer_CopyFileServer) error {
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v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
if v == nil {
return fmt.Errorf("not found volume id %d", req.VolumeId)
}
if uint32(v.CompactionRevision) != req.CompactionRevision {
return fmt.Errorf("volume %d is compacted", req.VolumeId)
}
bytesToRead := int64(req.StopOffset)
const BufferSize = 1024 * 1024 * 2
var fileName = v.FileName()
if req.IsDatFile {
fileName += ".dat"
} else if req.IsIdxFile {
fileName += ".idx"
}
file, err := os.Open(fileName)
if err != nil {
return err
}
defer file.Close()
buffer := make([]byte, BufferSize)
for bytesToRead > 0 {
bytesread, err := file.Read(buffer)
// println(fileName, "read", bytesread, "bytes, with target", bytesToRead)
if err != nil {
if err != io.EOF {
return err
}
// println(fileName, "read", bytesread, "bytes, with target", bytesToRead, "err", err.Error())
break
}
if int64(bytesread) > bytesToRead {
bytesread = int(bytesToRead)
}
err = stream.Send(&volume_server_pb.CopyFileResponse{
FileContent: buffer[:bytesread],
})
if err != nil {
// println("sending", bytesread, "bytes err", err.Error())
return err
}
bytesToRead -= int64(bytesread)
}
return nil
}