@Override
  public void testInsertTablets(Map<String, Tablet> tablets)
      throws IoTDBConnectionException, StatementExecutionException {
    testInsertTablets(tablets, false);
  }
This method NOT insert data into database and the server just return after accept the request,
this method should be used to test other time cost in client
iotdb-client/session/src/main/java/org/apache/iotdb/session/Session.java