// backupMetastore will backup the metastore on the host to the passed in path. Database and retention policy backups
// will force a backup of the metastore as well as requesting a specific shard backup from the command line
func (cmd *Command) backupMetastore() error {
metastoreArchivePath, err := cmd.nextPath(filepath.Join(cmd.path, Metafile))
if err != nil {
return err
}
cmd.Logger.Printf("backing up metastore to %s", metastoreArchivePath)
req := &snapshotter.Request{
Type: snapshotter.RequestMetastoreBackup,
}
return cmd.downloadAndVerify(req, metastoreArchivePath, func(file string) error {
var data meta.Data
binData, err := ioutil.ReadFile(file)
if err != nil {
return err
}
if data.UnmarshalBinary(binData) != nil {
cmd.Logger.Println("Invalid metadata blob, ensure the metadata service is running (default port 8088)")
return errors.New("invalid metadata received")
}
return nil
})
}
// unpackMeta reads the metadata from the backup directory and initializes a raft
// cluster and replaces the root metadata.
func (cmd *Command) unpackMeta() error {
// find the meta file
metaFiles, err := filepath.Glob(filepath.Join(cmd.backupFilesPath, backup.Metafile+".*"))
if err != nil {
return err
}
if len(metaFiles) == 0 {
return fmt.Errorf("no metastore backups in %s", cmd.backupFilesPath)
}
latest := metaFiles[len(metaFiles)-1]
fmt.Fprintf(cmd.Stdout, "Using metastore snapshot: %v\n", latest)
// Read the metastore backup
f, err := os.Open(latest)
if err != nil {
return err
}
var buf bytes.Buffer
if _, err := io.Copy(&buf, f); err != nil {
return fmt.Errorf("copy: %s", err)
}
b := buf.Bytes()
var i int
// Make sure the file is actually a meta store backup file
magic := btou64(b[:8])
if magic != snapshotter.BackupMagicHeader {
return fmt.Errorf("invalid metadata file")
}
i += 8
// Size of the meta store bytes
length := int(btou64(b[i : i+8]))
i += 8
metaBytes := b[i : i+length]
i += int(length)
// Size of the node.json bytes
length = int(btou64(b[i : i+8]))
i += 8
nodeBytes := b[i:]
// Unpack into metadata.
var data meta.Data
if err := data.UnmarshalBinary(metaBytes); err != nil {
return fmt.Errorf("unmarshal: %s", err)
}
// Copy meta config and remove peers so it starts in single mode.
c := cmd.MetaConfig
c.JoinPeers = nil
c.LoggingEnabled = false
// Create the meta dir
if os.MkdirAll(c.Dir, 0700); err != nil {
return err
}
// Write node.json back to meta dir
if err := ioutil.WriteFile(filepath.Join(c.Dir, "node.json"), nodeBytes, 0655); err != nil {
return err
}
// Initialize meta store.
store := meta.NewService(c)
store.RaftListener = newNopListener()
// Open the meta store.
if err := store.Open(); err != nil {
return fmt.Errorf("open store: %s", err)
}
defer store.Close()
// Wait for the store to be ready or error.
select {
case err := <-store.Err():
return err
default:
}
client := meta.NewClient([]string{store.HTTPAddr()}, false)
client.SetLogger(log.New(ioutil.Discard, "", 0))
if err := client.Open(); err != nil {
return err
}
defer client.Close()
// Force set the full metadata.
if err := client.SetData(&data); err != nil {
return fmt.Errorf("set data: %s", err)
}
return nil
}
// unpackMeta reads the metadata from the backup directory and initializes a raft
// cluster and replaces the root metadata.
func (cmd *Command) unpackMeta() error {
// find the meta file
metaFiles, err := filepath.Glob(filepath.Join(cmd.backupFilesPath, backup.Metafile+".*"))
if err != nil {
return err
}
if len(metaFiles) == 0 {
return fmt.Errorf("no metastore backups in %s", cmd.backupFilesPath)
}
latest := metaFiles[len(metaFiles)-1]
fmt.Fprintf(cmd.Stdout, "Using metastore snapshot: %v\n", latest)
// Read the metastore backup
f, err := os.Open(latest)
if err != nil {
return err
}
var buf bytes.Buffer
if _, err := io.Copy(&buf, f); err != nil {
return fmt.Errorf("copy: %s", err)
}
// Unpack into metadata.
var data meta.Data
if err := data.UnmarshalBinary(buf.Bytes()); err != nil {
return fmt.Errorf("unmarshal: %s", err)
}
// Copy meta config and remove peers so it starts in single mode.
c := cmd.MetaConfig
c.JoinPeers = nil
c.LoggingEnabled = false
// Initialize meta store.
store := meta.NewService(c)
store.RaftListener = newNopListener()
// Open the meta store.
if err := store.Open(); err != nil {
return fmt.Errorf("open store: %s", err)
}
defer store.Close()
// Wait for the store to be ready or error.
select {
case err := <-store.Err():
return err
default:
}
client := meta.NewClient([]string{store.HTTPAddr()}, false)
client.SetLogger(log.New(ioutil.Discard, "", 0))
if err := client.Open(); err != nil {
return err
}
defer client.Close()
// Force set the full metadata.
if err := client.SetData(&data); err != nil {
return fmt.Errorf("set data: %s", err)
}
return nil
}