Exemplo n.º 1
0
Arquivo: raft.go Projeto: algoadv/etcd
// getIDs returns an ordered set of IDs included in the given snapshot and
// the entries. The given snapshot/entries can contain two kinds of
// ID-related entry:
// - ConfChangeAddNode, in which case the contained ID will be added into the set.
// - ConfChangeAddRemove, in which case the contained ID will be removed from the set.
func getIDs(snap *raftpb.Snapshot, ents []raftpb.Entry) []uint64 {
	ids := make(map[uint64]bool)
	if snap != nil {
		for _, id := range snap.Metadata.ConfState.Nodes {
			ids[id] = true
		}
	}
	for _, e := range ents {
		if e.Type != raftpb.EntryConfChange {
			continue
		}
		var cc raftpb.ConfChange
		pbutil.MustUnmarshal(&cc, e.Data)
		switch cc.Type {
		case raftpb.ConfChangeAddNode:
			ids[cc.NodeID] = true
		case raftpb.ConfChangeRemoveNode:
			delete(ids, cc.NodeID)
		case raftpb.ConfChangeUpdateNode:
			// do nothing
		default:
			plog.Panicf("ConfChange Type should be either ConfChangeAddNode or ConfChangeRemoveNode!")
		}
	}
	sids := make(types.Uint64Slice, 0)
	for id := range ids {
		sids = append(sids, id)
	}
	sort.Sort(sids)
	return []uint64(sids)
}
Exemplo n.º 2
0
func readWAL(waldir string, snap walpb.Snapshot) (w *wal.WAL, id, cid types.ID, st raftpb.HardState, ents []raftpb.Entry) {
	var (
		err       error
		wmetadata []byte
	)

	repaired := false
	for {
		if w, err = wal.Open(waldir, snap); err != nil {
			plog.Fatalf("open wal error: %v", err)
		}
		if wmetadata, st, ents, err = w.ReadAll(); err != nil {
			w.Close()
			// we can only repair ErrUnexpectedEOF and we never repair twice.
			if repaired || err != io.ErrUnexpectedEOF {
				plog.Fatalf("read wal error (%v) and cannot be repaired", err)
			}
			if !wal.Repair(waldir) {
				plog.Fatalf("WAL error (%v) cannot be repaired", err)
			} else {
				plog.Infof("repaired WAL error (%v)", err)
				repaired = true
			}
			continue
		}
		break
	}
	var metadata pb.Metadata
	pbutil.MustUnmarshal(&metadata, wmetadata)
	id = types.ID(metadata.NodeID)
	cid = types.ID(metadata.ClusterID)
	return
}
Exemplo n.º 3
0
// handleBackup handles a request that intends to do a backup.
func handleBackup(c *cli.Context) {
	srcSnap := path.Join(c.String("data-dir"), "member", "snap")
	destSnap := path.Join(c.String("backup-dir"), "member", "snap")
	srcWAL := path.Join(c.String("data-dir"), "member", "wal")
	destWAL := path.Join(c.String("backup-dir"), "member", "wal")

	if err := os.MkdirAll(destSnap, 0700); err != nil {
		log.Fatalf("failed creating backup snapshot dir %v: %v", destSnap, err)
	}
	ss := snap.New(srcSnap)
	snapshot, err := ss.Load()
	if err != nil && err != snap.ErrNoSnapshot {
		log.Fatal(err)
	}
	var walsnap walpb.Snapshot
	if snapshot != nil {
		walsnap.Index, walsnap.Term = snapshot.Metadata.Index, snapshot.Metadata.Term
		newss := snap.New(destSnap)
		if err := newss.SaveSnap(*snapshot); err != nil {
			log.Fatal(err)
		}
	}

	w, err := wal.OpenForRead(srcWAL, walsnap)
	if err != nil {
		log.Fatal(err)
	}
	defer w.Close()
	wmetadata, state, ents, err := w.ReadAll()
	switch err {
	case nil:
	case wal.ErrSnapshotNotFound:
		fmt.Printf("Failed to find the match snapshot record %+v in wal %v.", walsnap, srcWAL)
		fmt.Printf("etcdctl will add it back. Start auto fixing...")
	default:
		log.Fatal(err)
	}
	var metadata etcdserverpb.Metadata
	pbutil.MustUnmarshal(&metadata, wmetadata)
	idgen := idutil.NewGenerator(0, time.Now())
	metadata.NodeID = idgen.Next()
	metadata.ClusterID = idgen.Next()

	neww, err := wal.Create(destWAL, pbutil.MustMarshal(&metadata))
	if err != nil {
		log.Fatal(err)
	}
	defer neww.Close()
	if err := neww.Save(state, ents); err != nil {
		log.Fatal(err)
	}
	if err := neww.SaveSnapshot(walsnap); err != nil {
		log.Fatal(err)
	}
}
Exemplo n.º 4
0
func (dec *msgAppV2Decoder) decode() (raftpb.Message, error) {
	var (
		m   raftpb.Message
		typ uint8
	)
	if _, err := io.ReadFull(dec.r, dec.uint8buf); err != nil {
		return m, err
	}
	typ = uint8(dec.uint8buf[0])
	switch typ {
	case msgTypeLinkHeartbeat:
		return linkHeartbeatMessage, nil
	case msgTypeAppEntries:
		m = raftpb.Message{
			Type:    raftpb.MsgApp,
			From:    uint64(dec.remote),
			To:      uint64(dec.local),
			Term:    dec.term,
			LogTerm: dec.term,
			Index:   dec.index,
		}

		// decode entries
		if _, err := io.ReadFull(dec.r, dec.uint64buf); err != nil {
			return m, err
		}
		l := binary.BigEndian.Uint64(dec.uint64buf)
		m.Entries = make([]raftpb.Entry, int(l))
		for i := 0; i < int(l); i++ {
			if _, err := io.ReadFull(dec.r, dec.uint64buf); err != nil {
				return m, err
			}
			size := binary.BigEndian.Uint64(dec.uint64buf)
			var buf []byte
			if size < msgAppV2BufSize {
				buf = dec.buf[:size]
				if _, err := io.ReadFull(dec.r, buf); err != nil {
					return m, err
				}
			} else {
				buf = make([]byte, int(size))
				if _, err := io.ReadFull(dec.r, buf); err != nil {
					return m, err
				}
			}
			dec.index++
			// 1 alloc
			pbutil.MustUnmarshal(&m.Entries[i], buf)
		}
		// decode commit index
		if _, err := io.ReadFull(dec.r, dec.uint64buf); err != nil {
			return m, err
		}
		m.Commit = binary.BigEndian.Uint64(dec.uint64buf)
	case msgTypeApp:
		var size uint64
		if err := binary.Read(dec.r, binary.BigEndian, &size); err != nil {
			return m, err
		}
		buf := make([]byte, int(size))
		if _, err := io.ReadFull(dec.r, buf); err != nil {
			return m, err
		}
		pbutil.MustUnmarshal(&m, buf)

		dec.term = m.Term
		dec.index = m.Index
		if l := len(m.Entries); l > 0 {
			dec.index = m.Entries[l-1].Index
		}
	default:
		return m, fmt.Errorf("failed to parse type %d in msgappv2 stream", typ)
	}
	return m, nil
}
Exemplo n.º 5
0
func mustUnmarshalState(d []byte) raftpb.HardState {
	var s raftpb.HardState
	pbutil.MustUnmarshal(&s, d)
	return s
}
Exemplo n.º 6
0
func mustUnmarshalEntry(d []byte) raftpb.Entry {
	var e raftpb.Entry
	pbutil.MustUnmarshal(&e, d)
	return e
}