shell: add volume.check.disk to fix inconsistency for replicated volumes

fix https://github.com/chrislusf/seaweedfs/issues/1923

weed/shell/command_volume_check_disk.go

@@ -0,0 +1,243 @@
+package shell
+
+import (
+	"bytes"
+	"context"
+	"flag"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
+	"io"
+	"math"
+	"sort"
+)
+
+func init() {
+	Commands = append(Commands, &commandVolumeCheckDisk{})
+}
+
+type commandVolumeCheckDisk struct {
+	env *CommandEnv
+}
+
+func (c *commandVolumeCheckDisk) Name() string {
+	return "volume.check.disk"
+}
+
+func (c *commandVolumeCheckDisk) Help() string {
+	return `check all replicated volumes to find and fix inconsistencies
+
+	How it works:
+	
+	find all volumes that are replicated
+	  for each volume id, if there are more than 2 replicas, find one pair with the largest 2 in file count.
+      for the pair volume A and B
+        append entries in A and not in B to B
+        append entries in B and not in A to A
+
+`
+}
+
+func (c *commandVolumeCheckDisk) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) {
+
+	if err = commandEnv.confirmIsLocked(); err != nil {
+		return
+	}
+
+	fsckCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
+	verbose := fsckCommand.Bool("v", false, "verbose mode")
+	applyChanges := fsckCommand.Bool("force", false, "apply the fix")
+	if err = fsckCommand.Parse(args); err != nil {
+		return nil
+	}
+
+	c.env = commandEnv
+
+	// collect topology information
+	topologyInfo, _, err := collectTopologyInfo(commandEnv)
+	if err != nil {
+		return err
+	}
+	volumeReplicas, _ := collectVolumeReplicaLocations(topologyInfo)
+
+	// pick 1 pairs of volume replica
+	fileCount := func(replica *VolumeReplica) uint64 {
+		return replica.info.FileCount - replica.info.DeleteCount
+	}
+	aDB, bDB := needle_map.NewMemDb(), needle_map.NewMemDb()
+	defer aDB.Close()
+	defer bDB.Close()
+
+	for _, replicas := range volumeReplicas {
+		sort.Slice(replicas, func(i, j int) bool {
+			return fileCount(replicas[i]) > fileCount(replicas[j])
+		})
+		for len(replicas) >= 2 {
+			a, b := replicas[0], replicas[1]
+			if fileCount(a) == fileCount(b) {
+				replicas = replicas[1:]
+				continue
+			}
+			if a.info.ReadOnly || b.info.ReadOnly {
+				fmt.Fprintf(writer, "skipping readonly volume %d on %s and %s\n", a.info.Id, a.location.dataNode.Id, b.location.dataNode.Id)
+				continue
+			}
+
+			// reset index db
+			aDB.Close()
+			bDB.Close()
+			aDB, bDB = needle_map.NewMemDb(), needle_map.NewMemDb()
+
+			// read index db
+			if err := c.readIndexDatabase(aDB, a.info.Collection, a.info.Id, a.location.dataNode.Id, *verbose, writer); err != nil {
+				return err
+			}
+			if err := c.readIndexDatabase(bDB, b.info.Collection, b.info.Id, b.location.dataNode.Id, *verbose, writer); err != nil {
+				return err
+			}
+
+			// find and make up the differnces
+			if err := c.doVolumeCheckDisk(aDB, bDB, a, b, *verbose, writer, *applyChanges); err != nil {
+				return err
+			}
+			if err := c.doVolumeCheckDisk(bDB, aDB, b, a, *verbose, writer, *applyChanges); err != nil {
+				return err
+			}
+			replicas = replicas[1:]
+		}
+	}
+
+	return nil
+}
+
+func (c *commandVolumeCheckDisk) doVolumeCheckDisk(subtrahend, minuend *needle_map.MemDb, source, target *VolumeReplica, verbose bool, writer io.Writer, applyChanges bool) error {
+
+	// find missing keys
+	// hash join, can be more efficient
+	var missingNeedles []needle_map.NeedleValue
+	var counter int
+	subtrahend.AscendingVisit(func(value needle_map.NeedleValue) error {
+		counter++
+		if _, found := minuend.Get(value.Key); !found {
+			missingNeedles = append(missingNeedles, value)
+		}
+		return nil
+	})
+
+	fmt.Fprintf(writer, "%s has %d entries, %s missed %d entries\n", source.location.dataNode.Id, counter, target.location.dataNode.Id, len(missingNeedles))
+
+	for _, needleValue := range missingNeedles {
+
+		needleBlob, err := c.readSourceNeedleBlob(source.location.dataNode.Id, source.info.Id, needleValue)
+		if err != nil {
+			return err
+		}
+
+		if !applyChanges {
+			continue
+		}
+
+		if verbose {
+			fmt.Fprintf(writer, "%s read %s \n", source.location.dataNode.Id, counter, target.location.dataNode.Id, len(missingNeedles))
+		}
+
+		if err := c.writeNeedleBlobToTarget(target.location.dataNode.Id, source.info.Id, needleValue, needleBlob); err != nil {
+			return err
+		}
+
+	}
+
+
+	return nil
+}
+
+func (c *commandVolumeCheckDisk) readSourceNeedleBlob(sourceVolumeServer string, volumeId uint32, needleValue needle_map.NeedleValue) (needleBlob []byte, err error) {
+
+	err = operation.WithVolumeServerClient(sourceVolumeServer, c.env.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+		resp, err := client.ReadNeedleBlob(context.Background(), &volume_server_pb.ReadNeedleBlobRequest{
+			VolumeId: volumeId,
+			NeedleId: uint64(needleValue.Key),
+			Offset: needleValue.Offset.ToActualOffset(),
+			Size: int32(needleValue.Size),
+		})
+		if err != nil {
+			return err
+		}
+		needleBlob = resp.NeedleBlob
+		return nil
+	})
+	return
+}
+
+func (c *commandVolumeCheckDisk) writeNeedleBlobToTarget(targetVolumeServer string, volumeId uint32, needleValue needle_map.NeedleValue, needleBlob []byte) error {
+
+	return operation.WithVolumeServerClient(targetVolumeServer, c.env.option.GrpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+		_, err := client.WriteNeedleBlob(context.Background(), &volume_server_pb.WriteNeedleBlobRequest{
+			VolumeId: volumeId,
+			NeedleId: uint64(needleValue.Key),
+			Size: int32(needleValue.Size),
+			NeedleBlob: needleBlob,
+		})
+		return err
+	})
+
+}
+
+func (c *commandVolumeCheckDisk) readIndexDatabase(db *needle_map.MemDb, collection string, volumeId uint32, volumeServer string, verbose bool, writer io.Writer) error {
+
+	var buf bytes.Buffer
+	if err := c.copyVolumeIndexFile(collection, volumeId, volumeServer, &buf, verbose, writer); err != nil {
+		return err
+	}
+
+	if verbose {
+		fmt.Fprintf(writer, "load collection %s volume %d index size %d from %s ...\n", collection, volumeId, buf.Len(), volumeServer)
+	}
+
+	return db.LoadFromReaderAt(bytes.NewReader(buf.Bytes()))
+
+}
+
+func (c *commandVolumeCheckDisk) copyVolumeIndexFile(collection string, volumeId uint32, volumeServer string, buf *bytes.Buffer, verbose bool, writer io.Writer) error {
+
+	return operation.WithVolumeServerClient(volumeServer, c.env.option.GrpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+
+		ext := ".idx"
+
+		copyFileClient, err := volumeServerClient.CopyFile(context.Background(), &volume_server_pb.CopyFileRequest{
+			VolumeId:                 volumeId,
+			Ext:                      ".idx",
+			CompactionRevision:       math.MaxUint32,
+			StopOffset:               math.MaxInt64,
+			Collection:               collection,
+			IsEcVolume:               false,
+			IgnoreSourceFileNotFound: false,
+		})
+		if err != nil {
+			return fmt.Errorf("failed to start copying volume %d%s: %v", volumeId, ext, err)
+		}
+
+		err = writeToBuffer(copyFileClient, buf)
+		if err != nil {
+			return fmt.Errorf("failed to copy %d%s from %s: %v", volumeId, ext, volumeServer, err)
+		}
+
+		return nil
+
+	})
+}
+
+func writeToBuffer(client volume_server_pb.VolumeServer_CopyFileClient, buf *bytes.Buffer) error {
+	for {
+		resp, receiveErr := client.Recv()
+		if receiveErr == io.EOF {
+			break
+		}
+		if receiveErr != nil {
+			return fmt.Errorf("receiving: %v", receiveErr)
+		}
+		buf.Write(resp.FileContent)
+	}
+	return nil
+}