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90 lines
2.6 KiB
90 lines
2.6 KiB
package main
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import (
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"fmt"
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"github.com/chrislusf/seaweedfs/go/operation"
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"github.com/chrislusf/seaweedfs/go/storage"
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)
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var (
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s BackupOptions
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)
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type BackupOptions struct {
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master *string
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collection *string
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dir *string
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volumeId *int
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}
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func init() {
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cmdBackup.Run = runBackup // break init cycle
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s.master = cmdBackup.Flag.String("server", "localhost:9333", "SeaweedFS master location")
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s.collection = cmdBackup.Flag.String("collection", "", "collection name")
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s.dir = cmdBackup.Flag.String("dir", ".", "directory to store volume data files")
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s.volumeId = cmdBackup.Flag.Int("volumeId", -1, "a volume id. The volume .dat and .idx files should already exist in the dir.")
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}
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var cmdBackup = &Command{
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UsageLine: "backup -dir=. -volumeId=234 -server=localhost:9333",
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Short: "incrementally backup a volume to local folder",
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Long: `Incrementally backup volume data.
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It is expected that you use this inside a script, to loop through
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all possible volume ids that needs to be backup to local folder.
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The volume id does not need to exist locally or even remotely.
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This will help to backup future new volumes.
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Usually backing up is just copying the .dat (and .idx) files.
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But it's tricky to incremententally copy the differences.
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The complexity comes when there are multiple addition, deletion and compaction.
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This tool will handle them correctly and efficiently, avoiding unnecessary data transporation.
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`,
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}
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func runBackup(cmd *Command, args []string) bool {
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if *s.volumeId == -1 {
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return false
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}
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vid := storage.VolumeId(*s.volumeId)
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// find volume location, replication, ttl info
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lookup, err := operation.Lookup(*s.master, vid.String())
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if err != nil {
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fmt.Printf("Error looking up volume %d: %v\n", vid, err)
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return true
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}
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volumeServer := lookup.Locations[0].Url
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stats, err := operation.GetVolumeSyncStatus(volumeServer, vid.String())
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if err != nil {
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fmt.Printf("Error get volume %d status: %v\n", vid, err)
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return true
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}
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ttl, err := storage.ReadTTL(stats.Ttl)
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if err != nil {
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fmt.Printf("Error get volume %d ttl %s: %v\n", vid, stats.Ttl, err)
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return true
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}
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replication, err := storage.NewReplicaPlacementFromString(stats.Replication)
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if err != nil {
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fmt.Printf("Error get volume %d replication %s : %v\n", vid, stats.Replication, err)
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return true
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}
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v, err := storage.NewVolume(*s.dir, *s.collection, vid, storage.NeedleMapInMemory, replication, ttl)
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if err != nil {
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fmt.Printf("Error creating or reading from volume %d: %v\n", vid, err)
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return true
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}
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if err := v.Synchronize(volumeServer); err != nil {
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fmt.Printf("Error synchronizing volume %d: %v\n", vid, err)
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return true
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}
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return true
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}
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