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https://github.com/etcd-io/etcd.git
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f6cd4d4f5b
Computing the snapshot file path is error prone; snapshot recovery was constructing file paths missing a path separator so the snapshot would never be loaded. Instead, refactor the backend path handling to use helper functions where possible.
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package etcdserver
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import (
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"io"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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"github.com/coreos/etcd/pkg/pbutil"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/raft/raftpb"
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"github.com/coreos/etcd/snap"
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"github.com/coreos/etcd/wal"
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"github.com/coreos/etcd/wal/walpb"
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)
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type Storage interface {
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// Save function saves ents and state to the underlying stable storage.
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// Save MUST block until st and ents are on stable storage.
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Save(st raftpb.HardState, ents []raftpb.Entry) error
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// SaveSnap function saves snapshot to the underlying stable storage.
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SaveSnap(snap raftpb.Snapshot) error
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// Close closes the Storage and performs finalization.
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Close() error
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}
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type storage struct {
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*wal.WAL
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*snap.Snapshotter
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}
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func NewStorage(w *wal.WAL, s *snap.Snapshotter) Storage {
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return &storage{w, s}
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}
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// SaveSnap saves the snapshot to disk and release the locked
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// wal files since they will not be used.
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func (st *storage) SaveSnap(snap raftpb.Snapshot) error {
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walsnap := walpb.Snapshot{
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Index: snap.Metadata.Index,
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Term: snap.Metadata.Term,
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}
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err := st.WAL.SaveSnapshot(walsnap)
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if err != nil {
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return err
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}
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err = st.Snapshotter.SaveSnap(snap)
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if err != nil {
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return err
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}
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return st.WAL.ReleaseLockTo(snap.Metadata.Index)
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}
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func readWAL(waldir string, snap walpb.Snapshot) (w *wal.WAL, id, cid types.ID, st raftpb.HardState, ents []raftpb.Entry) {
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var (
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err error
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wmetadata []byte
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)
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repaired := false
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for {
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if w, err = wal.Open(waldir, snap); err != nil {
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plog.Fatalf("open wal error: %v", err)
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}
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if wmetadata, st, ents, err = w.ReadAll(); err != nil {
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w.Close()
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// we can only repair ErrUnexpectedEOF and we never repair twice.
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if repaired || err != io.ErrUnexpectedEOF {
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plog.Fatalf("read wal error (%v) and cannot be repaired", err)
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}
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if !wal.Repair(waldir) {
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plog.Fatalf("WAL error (%v) cannot be repaired", err)
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} else {
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plog.Infof("repaired WAL error (%v)", err)
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repaired = true
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}
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continue
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}
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break
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}
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var metadata pb.Metadata
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pbutil.MustUnmarshal(&metadata, wmetadata)
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id = types.ID(metadata.NodeID)
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cid = types.ID(metadata.ClusterID)
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return
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}
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