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wal: save empty snapshot when create

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So caller can open at empty snapshot to read all entries.
This commit is contained in:
Yicheng Qin 2015-01-06 19:47:18 -08:00
parent 78bb207bac
commit 6460e49a33
3 changed files with 9 additions and 4 deletions
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3
etcdserver/server.go
View File

@ -859,9 +859,6 @@ func startNode(cfg *ServerConfig, ids []types.ID) (id types.ID, n raft.Node, s *
if w, err = wal.Create(cfg.WALDir(), metadata); err != nil {
log.Fatalf("etcdserver: create wal error: %v", err)
}
if err = w.SaveSnapshot(walpb.Snapshot{}); err != nil {
log.Fatalf("etcdserver: save empty snapshot error: %v", err)
}
peers := make([]raft.Peer, len(ids))
for i, id := range ids {
ctx, err := json.Marshal((*cfg.Cluster).Member(id))

2
wal/wal.go
View File

@ -113,7 +113,7 @@ func Create(dirpath string, metadata []byte) (*WAL, error) {
if err := w.encoder.encode(&walpb.Record{Type: metadataType, Data: metadata}); err != nil {
return nil, err
}
if err = w.sync(); err != nil {
if err = w.SaveSnapshot(walpb.Snapshot{}); err != nil {
return nil, err
}
return w, nil

8
wal/wal_test.go
View File

@ -24,6 +24,7 @@ import (
"reflect"
"testing"
"github.com/coreos/etcd/pkg/pbutil"
"github.com/coreos/etcd/raft/raftpb"
"github.com/coreos/etcd/wal/walpb"
)
@ -58,6 +59,13 @@ func TestNew(t *testing.T) {
if err != nil {
t.Fatalf("err = %v, want nil", err)
}
r := &walpb.Record{
Type: snapshotType,
Data: pbutil.MustMarshal(&walpb.Snapshot{}),
}
if err = e.encode(r); err != nil {
t.Fatalf("err = %v, want nil", err)
}
e.flush()
if !reflect.DeepEqual(gd, wb.Bytes()) {
t.Errorf("data = %v, want %v", gd, wb.Bytes())