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contrib/raftexample: Save snapshot and WAL before hard state #13929

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Apr 13, 2022
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contrib/raftexample: Save snapshot and WAL before hard state #13929

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6 changes: 5 additions & 1 deletion contrib/raftexample/raft.go
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Original file line number Diff line number Diff line change
Expand Up @@ -449,9 +449,13 @@ func (rc *raftNode) serveChannels() {

// store raft entries to wal, then publish over commit channel
case rd := <-rc.node.Ready():
rc.wal.Save(rd.HardState, rd.Entries)
// Must save the snapshot file and WAL snapshot entry before saving any other entries
// or hardstate to ensure that recovery after a snapshot restore is possible.
if !raft.IsEmptySnap(rd.Snapshot) {
rc.saveSnap(rd.Snapshot)
}
rc.wal.Save(rd.HardState, rd.Entries)
if !raft.IsEmptySnap(rd.Snapshot) {
rc.raftStorage.ApplySnapshot(rd.Snapshot)
rc.publishSnapshot(rd.Snapshot)
}
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