@BeforeClass
  public static void setUp() throws Exception {
    EnvFactory.getEnv().getConfig().getCommonConfig().setSeriesSlotNum(1);
    EnvFactory.getEnv().initClusterEnvironment();
    insertData();
  }
Change series_slot_num to 1, to generate more devices which are cross data regions as possible.
integration-test/src/test/java/org/apache/iotdb/db/it/alignbydevice/IoTDBAlignByDevice3IT.java