Enhancement: persist commit index in LogStore to accelerate recovery

log.go

@@ -190,3 +190,13 @@ func emitLogStoreMetrics(s LogStore, prefix []string, interval time.Duration, st
 		}
 	}
 }
+
+type CommitTrackingLogStore interface {
+	SetCommitIndex(idx uint64) error
+	ReadCommitIndex() (uint64, error)
+}
+
+func isCommitTrackingLogStore(s LogStore) bool {
+	_, ok := s.(CommitTrackingLogStore)
+	return ok
+}