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84 lines
2.3 KiB
84 lines
2.3 KiB
package main
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import (
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"flag"
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"fmt"
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"os"
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"path"
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"strconv"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage"
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)
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var (
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fixVolumePath = flag.String("dir", "/tmp", "data directory to store files")
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fixVolumeCollection = flag.String("collection", "", "the volume collection name")
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fixVolumeId = flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir. The volume index file should not exist.")
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targetReplica = flag.String("replication", "", "If just empty, only print out current replication setting.")
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)
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/*
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This is to change replication factor in .dat file header. Need to shut down the volume servers
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that has those volumes.
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1. fix the .dat file in place
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// just see the replication setting
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go run change_replication.go -volumeId=9 -dir=/Users/chrislu/Downloads
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Current Volume Replication: 000
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// fix the replication setting
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go run change_replication.go -volumeId=9 -dir=/Users/chrislu/Downloads -replication 001
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Current Volume Replication: 000
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Changing to: 001
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Done.
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2. copy the fixed .dat and related .idx files to some remote server
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3. restart volume servers or start new volume servers.
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*/
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func main() {
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flag.Parse()
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fileName := strconv.Itoa(*fixVolumeId)
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if *fixVolumeCollection != "" {
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fileName = *fixVolumeCollection + "_" + fileName
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}
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datFile, err := os.OpenFile(path.Join(*fixVolumePath, fileName+".dat"), os.O_RDWR, 0644)
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if err != nil {
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glog.Fatalf("Open Volume Data File [ERROR]: %v", err)
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}
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defer datFile.Close()
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header := make([]byte, storage.SuperBlockSize)
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if _, e := datFile.Read(header); e != nil {
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glog.Fatalf("cannot read volume %s super block: %v", fileName+".dat", e)
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}
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superBlock, err := storage.ParseSuperBlock(header)
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if err != nil {
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glog.Fatalf("cannot parse existing super block: %v", err)
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}
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fmt.Printf("Current Volume Replication: %s\n", superBlock.ReplicaPlacement)
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if *targetReplica == "" {
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return
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}
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replica, err := storage.NewReplicaPlacementFromString(*targetReplica)
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if err != nil {
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glog.Fatalf("cannot parse target replica %s: %v", *targetReplica, err)
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}
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fmt.Printf("Changing to: %s\n", replica)
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superBlock.ReplicaPlacement = replica
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header = superBlock.Bytes()
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if n, e := datFile.WriteAt(header, 0); n == 0 || e != nil {
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glog.Fatalf("cannot write super block: %v", e)
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}
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fmt.Println("Done.")
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}
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