private List<TEndPoint> getNodeUrls() {
    if (defaultEndPoint != null) {
      return Collections.singletonList(defaultEndPoint);
    } else {
      return SessionUtils.parseSeedNodeUrls(nodeUrls);
    }
  }
Multiple nodeUrl,If one node down, connect to the next one

@param nodeUrls List<String> Multiple ip:rpcPort eg.127.0.0.1:9001
iotdb-client/session/src/main/java/org/apache/iotdb/session/Session.java