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99 lines
2.6 KiB
99 lines
2.6 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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targetTTL = flag.String("ttl", "", "If just empty, only print out current ttl 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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superBlock, err := storage.ReadSuperBlock(datFile)
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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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fmt.Printf("Current Volume TTL: %s\n", superBlock.Ttl.String())
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hasChange := false
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if *targetReplica != "" {
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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 replication to: %s\n", replica)
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superBlock.ReplicaPlacement = replica
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hasChange = true
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}
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if *targetTTL != "" {
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ttl, err := storage.ReadTTL(*targetTTL)
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if err != nil {
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glog.Fatalf("cannot parse target ttl %s: %v", *targetTTL, err)
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}
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fmt.Printf("Changing ttl to: %s\n", ttl)
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superBlock.Ttl = ttl
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hasChange = true
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}
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if hasChange {
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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("Change Applied.")
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}
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}
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