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raftexample: load snapshot when opening WAL

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Fix https://github.com/coreos/etcd/issues/7056.
Previously we don't load snapshot when replaying WAL.
This commit is contained in:
Gyu-Ho Lee 2016-12-30 16:26:27 -08:00
parent 24601ca24b
commit 0af1679b61
2 changed files with 25 additions and 5 deletions
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1
contrib/raftexample/kvstore.go
View File

@ -77,6 +77,7 @@ func (s *kvstore) readCommits(commitC <-chan *string, errorC <-chan error) {
if err := s.recoverFromSnapshot(snapshot.Data); err != nil {
log.Panic(err)
}
continue
}
var dataKv kv

29
contrib/raftexample/raft.go
View File

@ -94,7 +94,6 @@ func newRaftNode(id int, peers []string, join bool, getSnapshot func() ([]byte,
waldir: fmt.Sprintf("raftexample-%d", id),
snapdir: fmt.Sprintf("raftexample-%d-snap", id),
getSnapshot: getSnapshot,
raftStorage: raft.NewMemoryStorage(),
snapCount: defaultSnapCount,
stopc: make(chan struct{}),
httpstopc: make(chan struct{}),
@ -185,8 +184,16 @@ func (rc *raftNode) publishEntries(ents []raftpb.Entry) bool {
return true
}
func (rc *raftNode) loadSnapshot() *raftpb.Snapshot {
snapshot, err := rc.snapshotter.Load()
if err != nil && err != snap.ErrNoSnapshot {
log.Fatalf("raftexample: error loading snapshot (%v)", err)
}
return snapshot
}
// openWAL returns a WAL ready for reading.
func (rc *raftNode) openWAL() *wal.WAL {
func (rc *raftNode) openWAL(snapshot *raftpb.Snapshot) *wal.WAL {
if !wal.Exist(rc.waldir) {
if err := os.Mkdir(rc.waldir, 0750); err != nil {
log.Fatalf("raftexample: cannot create dir for wal (%v)", err)
@ -199,7 +206,12 @@ func (rc *raftNode) openWAL() *wal.WAL {
w.Close()
}
w, err := wal.Open(rc.waldir, walpb.Snapshot{})
walsnap := walpb.Snapshot{}
if snapshot != nil {
walsnap.Index, walsnap.Term = snapshot.Metadata.Index, snapshot.Metadata.Term
}
log.Printf("loading WAL at term %d and index %d", walsnap.Term, walsnap.Index)
w, err := wal.Open(rc.waldir, walsnap)
if err != nil {
log.Fatalf("raftexample: error loading wal (%v)", err)
}
@ -209,11 +221,19 @@ func (rc *raftNode) openWAL() *wal.WAL {
// replayWAL replays WAL entries into the raft instance.
func (rc *raftNode) replayWAL() *wal.WAL {
w := rc.openWAL()
log.Printf("replaying WAL of member %d", rc.id)
snapshot := rc.loadSnapshot()
w := rc.openWAL(snapshot)
_, st, ents, err := w.ReadAll()
if err != nil {
log.Fatalf("raftexample: failed to read WAL (%v)", err)
}
rc.raftStorage = raft.NewMemoryStorage()
if snapshot != nil {
rc.raftStorage.ApplySnapshot(*snapshot)
}
rc.raftStorage.SetHardState(st)
// append to storage so raft starts at the right place in log
rc.raftStorage.Append(ents)
// send nil once lastIndex is published so client knows commit channel is current
@ -222,7 +242,6 @@ func (rc *raftNode) replayWAL() *wal.WAL {
} else {
rc.commitC <- nil
}
rc.raftStorage.SetHardState(st)
return w
}