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contrib/raftexample: save snapshot to WAL first

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Save the snapshot index to the WAL before saving the snapshot to the
filesystem. This ensures that we'll only ever call wal.Open with a
snapshot that was previously saved to the WAL.
This commit is contained in:
Jackson Owens 2017-06-12 13:56:01 -07:00
parent 3993f37a26
commit 74e020b715
1 changed files with 6 additions and 3 deletions
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9
contrib/raftexample/raft.go
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@ -107,9 +107,9 @@ func newRaftNode(id int, peers []string, join bool, getSnapshot func() ([]byte,
}
func (rc *raftNode) saveSnap(snap raftpb.Snapshot) error {
if err := rc.snapshotter.SaveSnap(snap); err != nil {
return err
}
// must save the snapshot index to the WAL before saving the
// snapshot to maintain the invariant that we only Open the
// wal at previously-saved snapshot indexes.
walSnap := walpb.Snapshot{
Index: snap.Metadata.Index,
Term: snap.Metadata.Term,
@ -117,6 +117,9 @@ func (rc *raftNode) saveSnap(snap raftpb.Snapshot) error {
if err := rc.wal.SaveSnapshot(walSnap); err != nil {
return err
}
if err := rc.snapshotter.SaveSnap(snap); err != nil {
return err
}
return rc.wal.ReleaseLockTo(snap.Metadata.Index)
}