// 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 snapshot and initializes a raft
// cluster and replaces the root metadata.
func (cmd *Command) unpackMeta(mr *snapshot.MultiReader, sf snapshot.File, config *Config) error {
// Read meta into buffer.
var buf bytes.Buffer
if _, err := io.CopyN(&buf, mr, sf.Size); 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 := config.Meta
c.Peers = nil
// Initialize meta store.
store := meta.NewStore(config.Meta)
store.RaftListener = newNopListener()
store.ExecListener = newNopListener()
store.RPCListener = newNopListener()
// Determine advertised address.
_, port, err := net.SplitHostPort(config.Meta.BindAddress)
if err != nil {
return fmt.Errorf("split bind address: %s", err)
}
hostport := net.JoinHostPort(config.Meta.Hostname, port)
// Resolve address.
addr, err := net.ResolveTCPAddr("tcp", hostport)
if err != nil {
return fmt.Errorf("resolve tcp: addr=%s, err=%s", hostport, err)
}
store.Addr = addr
store.RemoteAddr = addr
// 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 <-store.Ready():
case err := <-store.Err():
return err
}
// Force set the full metadata.
if err := store.SetData(&data); err != nil {
return fmt.Errorf("set data: %s", err)
}
return nil
}
// Ensure the data can be marshaled and unmarshaled.
func TestData_MarshalBinary(t *testing.T) {
data := meta.Data{
Term: 10,
Index: 20,
Nodes: []meta.NodeInfo{
{ID: 1, Host: "host0"},
{ID: 2, Host: "host1"},
},
Databases: []meta.DatabaseInfo{
{
Name: "db0",
DefaultRetentionPolicy: "default",
RetentionPolicies: []meta.RetentionPolicyInfo{
{
Name: "rp0",
ReplicaN: 3,
Duration: 10 * time.Second,
ShardGroupDuration: 3 * time.Millisecond,
ShardGroups: []meta.ShardGroupInfo{
{
ID: 100,
StartTime: time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC),
EndTime: time.Date(2000, time.February, 1, 0, 0, 0, 0, time.UTC),
Shards: []meta.ShardInfo{
{
ID: 200,
Owners: []meta.ShardOwner{
{NodeID: 1},
{NodeID: 3},
{NodeID: 4},
},
},
},
},
},
},
},
ContinuousQueries: []meta.ContinuousQueryInfo{
{Query: "SELECT count() FROM foo"},
},
},
},
Users: []meta.UserInfo{
{
Name: "susy",
Hash: "ABC123",
Admin: true,
Privileges: map[string]influxql.Privilege{"db0": influxql.AllPrivileges},
},
},
}
// Marshal the data struture.
buf, err := data.MarshalBinary()
if err != nil {
t.Fatal(err)
}
// Unmarshal into new data.
var other meta.Data
if err := other.UnmarshalBinary(buf); err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(data.Nodes, other.Nodes) {
t.Fatalf("unexpected nodes: %#v", other.Nodes)
} else if !reflect.DeepEqual(data.Databases, other.Databases) {
spew.Dump(data.Databases)
spew.Dump(other.Databases)
t.Fatalf("unexpected databases: %#v", other.Databases)
} else if !reflect.DeepEqual(data.Users, other.Users) {
t.Fatalf("unexpected users: %#v", other.Users)
}
}
// 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)
}
// Read the metastore backup
f, err := os.Open(metaFiles[len(metaFiles)-1])
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)
}
// Initialize meta store.
store := meta.NewStore(cmd.MetaConfig)
store.RaftListener = newNopListener()
store.ExecListener = newNopListener()
store.RPCListener = newNopListener()
// Determine advertised address.
_, port, err := net.SplitHostPort(cmd.MetaConfig.BindAddress)
if err != nil {
return fmt.Errorf("split bind address: %s", err)
}
hostport := net.JoinHostPort(cmd.MetaConfig.Hostname, port)
// Resolve address.
addr, err := net.ResolveTCPAddr("tcp", hostport)
if err != nil {
return fmt.Errorf("resolve tcp: addr=%s, err=%s", hostport, err)
}
store.Addr = addr
store.RemoteAddr = addr
// 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 <-store.Ready():
case err := <-store.Err():
return err
}
// Force set the full metadata.
if err := store.SetData(&data); err != nil {
return fmt.Errorf("set data: %s", err)
}
return nil
}