tier storage: support downloading the remote dat files

weed/shell/command_volume_tier_upload.go

@@ -0,0 +1,148 @@
+package shell
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"time"
+
+	"google.golang.org/grpc"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+)
+
+func init() {
+	Commands = append(Commands, &commandVolumeTierUpload{})
+}
+
+type commandVolumeTierUpload struct {
+}
+
+func (c *commandVolumeTierUpload) Name() string {
+	return "volume.tier.upload"
+}
+
+func (c *commandVolumeTierUpload) Help() string {
+	return `move the dat file of a volume to a remote tier
+
+	volume.tier.upload [-collection=""] [-fullPercent=95] [-quietFor=1h]
+	volume.tier.upload [-collection=""] -volumeId=<volume_id> -dest=<storage_backend> [-keepLocalDatFile]
+
+	e.g.:
+	volume.tier.upload -volumeId=7 -dest=s3
+	volume.tier.upload -volumeId=7 -dest=s3.default
+
+	The <storage_backend> is defined in master.toml.
+	For example, "s3.default" in [storage.backend.s3.default]
+
+	This command will move the dat file of a volume to a remote tier.
+
+	SeaweedFS enables scalable and fast local access to lots of files, 
+	and the cloud storage is slower by cost efficient. How to combine them together?
+
+	Usually the data follows 80/20 rule: only 20% of data is frequently accessed.
+	We can offload the old volumes to the cloud.
+
+	With this, SeaweedFS can be both fast and scalable, and infinite storage space.
+	Just add more local SeaweedFS volume servers to increase the throughput.
+
+	The index file is still local, and the same O(1) disk read is applied to the remote file.
+
+`
+}
+
+func (c *commandVolumeTierUpload) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	tierCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	volumeId := tierCommand.Int("volumeId", 0, "the volume id")
+	collection := tierCommand.String("collection", "", "the collection name")
+	fullPercentage := tierCommand.Float64("fullPercent", 95, "the volume reaches the percentage of max volume size")
+	quietPeriod := tierCommand.Duration("quietFor", 24*time.Hour, "select volumes without no writes for this period")
+	dest := tierCommand.String("dest", "", "the target tier name")
+	keepLocalDatFile := tierCommand.Bool("keepLocalDatFile", false, "whether keep local dat file")
+	if err = tierCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	ctx := context.Background()
+	vid := needle.VolumeId(*volumeId)
+
+	// volumeId is provided
+	if vid != 0 {
+		return doVolumeTierUpload(ctx, commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile)
+	}
+
+	// apply to all volumes in the collection
+	// reusing collectVolumeIdsForEcEncode for now
+	volumeIds, err := collectVolumeIdsForEcEncode(ctx, commandEnv, *collection, *fullPercentage, *quietPeriod)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("tier upload volumes: %v\n", volumeIds)
+	for _, vid := range volumeIds {
+		if err = doVolumeTierUpload(ctx, commandEnv, writer, *collection, vid, *dest, *keepLocalDatFile); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func doVolumeTierUpload(ctx context.Context, commandEnv *CommandEnv, writer io.Writer, collection string, vid needle.VolumeId, dest string, keepLocalDatFile bool) (err error) {
+	// find volume location
+	locations, found := commandEnv.MasterClient.GetLocations(uint32(vid))
+	if !found {
+		return fmt.Errorf("volume %d not found", vid)
+	}
+
+	err = markVolumeReadonly(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), locations)
+	if err != nil {
+		return fmt.Errorf("mark volume %d as readonly on %s: %v", vid, locations[0].Url, err)
+	}
+
+	// copy the .dat file to remote tier
+	err = uploadDatToRemoteTier(ctx, commandEnv.option.GrpcDialOption, writer, needle.VolumeId(vid), collection, locations[0].Url, dest, keepLocalDatFile)
+	if err != nil {
+		return fmt.Errorf("copy dat file for volume %d on %s to %s: %v", vid, locations[0].Url, dest, err)
+	}
+
+	return nil
+}
+
+func uploadDatToRemoteTier(ctx context.Context, grpcDialOption grpc.DialOption, writer io.Writer, volumeId needle.VolumeId, collection string, sourceVolumeServer string, dest string, keepLocalDatFile bool) error {
+
+	err := operation.WithVolumeServerClient(sourceVolumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		stream, copyErr := volumeServerClient.VolumeTierMoveDatToRemote(ctx, &volume_server_pb.VolumeTierMoveDatToRemoteRequest{
+			VolumeId:               uint32(volumeId),
+			Collection:             collection,
+			DestinationBackendName: dest,
+			KeepLocalDatFile:       keepLocalDatFile,
+		})
+
+		var lastProcessed int64
+		for {
+			resp, recvErr := stream.Recv()
+			if recvErr != nil {
+				if recvErr == io.EOF {
+					break
+				} else {
+					return recvErr
+				}
+			}
+
+			processingSpeed := float64(resp.Processed-lastProcessed) / 1024.0 / 1024.0
+
+			fmt.Fprintf(writer, "copied %.2f%%, %d bytes, %.2fMB/s\n", resp.ProcessedPercentage, resp.Processed, processingSpeed)
+
+			lastProcessed = resp.Processed
+		}
+
+		return copyErr
+	})
+
+	return err
+
+}