seaweedfs/weed/command/backup.go

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