package shell import ( "context" "flag" "fmt" "github.com/seaweedfs/seaweedfs/weed/pb" "io" "github.com/seaweedfs/seaweedfs/weed/operation" "github.com/seaweedfs/seaweedfs/weed/pb/volume_server_pb" "github.com/seaweedfs/seaweedfs/weed/storage/erasure_coding" "github.com/seaweedfs/seaweedfs/weed/storage/needle" "google.golang.org/grpc" ) func init() { Commands = append(Commands, &commandEcRebuild{}) } type commandEcRebuild struct { } func (c *commandEcRebuild) Name() string { return "ec.rebuild" } func (c *commandEcRebuild) Help() string { return `find and rebuild missing ec shards among volume servers ec.rebuild [-c EACH_COLLECTION|] [-force] Algorithm: For each type of volume server (different max volume count limit){ for each collection { rebuildEcVolumes() } } func rebuildEcVolumes(){ idealWritableVolumes = totalWritableVolumes / numVolumeServers for { sort all volume servers ordered by the number of local writable volumes pick the volume server A with the lowest number of writable volumes x pick the volume server B with the highest number of writable volumes y if y > idealWritableVolumes and x +1 <= idealWritableVolumes { if B has a writable volume id v that A does not have { move writable volume v from A to B } } } } ` } func (c *commandEcRebuild) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) { fixCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError) collection := fixCommand.String("collection", "EACH_COLLECTION", "collection name, or \"EACH_COLLECTION\" for each collection") applyChanges := fixCommand.Bool("force", false, "apply the changes") if err = fixCommand.Parse(args); err != nil { return nil } infoAboutSimulationMode(writer, *applyChanges, "-force") if err = commandEnv.confirmIsLocked(args); err != nil { return } // collect all ec nodes allEcNodes, _, err := collectEcNodes(commandEnv, "") if err != nil { return err } if *collection == "EACH_COLLECTION" { collections, err := ListCollectionNames(commandEnv, false, true) if err != nil { return err } fmt.Printf("rebuildEcVolumes collections %+v\n", len(collections)) for _, c := range collections { fmt.Printf("rebuildEcVolumes collection %+v\n", c) if err = rebuildEcVolumes(commandEnv, allEcNodes, c, writer, *applyChanges); err != nil { return err } } } else { if err = rebuildEcVolumes(commandEnv, allEcNodes, *collection, writer, *applyChanges); err != nil { return err } } return nil } func rebuildEcVolumes(commandEnv *CommandEnv, allEcNodes []*EcNode, collection string, writer io.Writer, applyChanges bool) error { fmt.Printf("rebuildEcVolumes %s\n", collection) // collect vid => each shard locations, similar to ecShardMap in topology.go ecShardMap := make(EcShardMap) for _, ecNode := range allEcNodes { ecShardMap.registerEcNode(ecNode, collection) } for vid, locations := range ecShardMap { shardCount := locations.shardCount() if shardCount == erasure_coding.TotalShardsCount { continue } if shardCount < erasure_coding.DataShardsCount { return fmt.Errorf("ec volume %d is unrepairable with %d shards\n", vid, shardCount) } sortEcNodesByFreeslotsDecending(allEcNodes) if allEcNodes[0].freeEcSlot < erasure_coding.TotalShardsCount { return fmt.Errorf("disk space is not enough") } if err := rebuildOneEcVolume(commandEnv, allEcNodes[0], collection, vid, locations, writer, applyChanges); err != nil { return err } } return nil } func rebuildOneEcVolume(commandEnv *CommandEnv, rebuilder *EcNode, collection string, volumeId needle.VolumeId, locations EcShardLocations, writer io.Writer, applyChanges bool) error { fmt.Printf("rebuildOneEcVolume %s %d\n", collection, volumeId) // collect shard files to rebuilder local disk var generatedShardIds []uint32 copiedShardIds, _, err := prepareDataToRecover(commandEnv, rebuilder, collection, volumeId, locations, writer, applyChanges) if err != nil { return err } defer func() { // clean up working files // ask the rebuilder to delete the copied shards err = sourceServerDeleteEcShards(commandEnv.option.GrpcDialOption, collection, volumeId, pb.NewServerAddressFromDataNode(rebuilder.info), copiedShardIds) if err != nil { fmt.Fprintf(writer, "%s delete copied ec shards %s %d.%v\n", rebuilder.info.Id, collection, volumeId, copiedShardIds) } }() if !applyChanges { return nil } // generate ec shards, and maybe ecx file generatedShardIds, err = generateMissingShards(commandEnv.option.GrpcDialOption, collection, volumeId, pb.NewServerAddressFromDataNode(rebuilder.info)) if err != nil { return err } // mount the generated shards err = mountEcShards(commandEnv.option.GrpcDialOption, collection, volumeId, pb.NewServerAddressFromDataNode(rebuilder.info), generatedShardIds) if err != nil { return err } rebuilder.addEcVolumeShards(volumeId, collection, generatedShardIds) return nil } func generateMissingShards(grpcDialOption grpc.DialOption, collection string, volumeId needle.VolumeId, sourceLocation pb.ServerAddress) (rebuiltShardIds []uint32, err error) { err = operation.WithVolumeServerClient(false, sourceLocation, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error { resp, rebultErr := volumeServerClient.VolumeEcShardsRebuild(context.Background(), &volume_server_pb.VolumeEcShardsRebuildRequest{ VolumeId: uint32(volumeId), Collection: collection, }) if rebultErr == nil { rebuiltShardIds = resp.RebuiltShardIds } return rebultErr }) return } func prepareDataToRecover(commandEnv *CommandEnv, rebuilder *EcNode, collection string, volumeId needle.VolumeId, locations EcShardLocations, writer io.Writer, applyBalancing bool) (copiedShardIds []uint32, localShardIds []uint32, err error) { needEcxFile := true var localShardBits erasure_coding.ShardBits for _, diskInfo := range rebuilder.info.DiskInfos { for _, ecShardInfo := range diskInfo.EcShardInfos { if ecShardInfo.Collection == collection && needle.VolumeId(ecShardInfo.Id) == volumeId { needEcxFile = false localShardBits = erasure_coding.ShardBits(ecShardInfo.EcIndexBits) } } } for shardId, ecNodes := range locations { if len(ecNodes) == 0 { fmt.Fprintf(writer, "missing shard %d.%d\n", volumeId, shardId) continue } if localShardBits.HasShardId(erasure_coding.ShardId(shardId)) { localShardIds = append(localShardIds, uint32(shardId)) fmt.Fprintf(writer, "use existing shard %d.%d\n", volumeId, shardId) continue } var copyErr error if applyBalancing { copyErr = operation.WithVolumeServerClient(false, pb.NewServerAddressFromDataNode(rebuilder.info), commandEnv.option.GrpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error { _, copyErr := volumeServerClient.VolumeEcShardsCopy(context.Background(), &volume_server_pb.VolumeEcShardsCopyRequest{ VolumeId: uint32(volumeId), Collection: collection, ShardIds: []uint32{uint32(shardId)}, CopyEcxFile: needEcxFile, CopyEcjFile: needEcxFile, CopyVifFile: needEcxFile, SourceDataNode: ecNodes[0].info.Id, }) return copyErr }) if copyErr == nil && needEcxFile { needEcxFile = false } } if copyErr != nil { fmt.Fprintf(writer, "%s failed to copy %d.%d from %s: %v\n", rebuilder.info.Id, volumeId, shardId, ecNodes[0].info.Id, copyErr) } else { fmt.Fprintf(writer, "%s copied %d.%d from %s\n", rebuilder.info.Id, volumeId, shardId, ecNodes[0].info.Id) copiedShardIds = append(copiedShardIds, uint32(shardId)) } } if len(copiedShardIds)+len(localShardIds) >= erasure_coding.DataShardsCount { return copiedShardIds, localShardIds, nil } return nil, nil, fmt.Errorf("%d shards are not enough to recover volume %d", len(copiedShardIds)+len(localShardIds), volumeId) } type EcShardMap map[needle.VolumeId]EcShardLocations type EcShardLocations [][]*EcNode func (ecShardMap EcShardMap) registerEcNode(ecNode *EcNode, collection string) { for _, diskInfo := range ecNode.info.DiskInfos { for _, shardInfo := range diskInfo.EcShardInfos { if shardInfo.Collection == collection { existing, found := ecShardMap[needle.VolumeId(shardInfo.Id)] if !found { existing = make([][]*EcNode, erasure_coding.TotalShardsCount) ecShardMap[needle.VolumeId(shardInfo.Id)] = existing } for _, shardId := range erasure_coding.ShardBits(shardInfo.EcIndexBits).ShardIds() { existing[shardId] = append(existing[shardId], ecNode) } } } } } func (ecShardLocations EcShardLocations) shardCount() (count int) { for _, locations := range ecShardLocations { if len(locations) > 0 { count++ } } return }