@Before
  public void setUp() throws Exception {
    try (RegionLocator locator = hbaseTestingUtility.getConnection().getRegionLocator(TABLE1)) {
      RegionInfo firstHRI = locator.getAllRegionLocations().get(0).getRegion();
      r1name = firstHRI.getRegionName();
      rs1 = hbaseTestingUtility.getHBaseCluster()
        .getRegionServer(hbaseTestingUtility.getHBaseCluster().getServerWith(r1name));
      r1 = rs1.getRegion(r1name);
      hMaster = hbaseTestingUtility.getHBaseCluster().getMaster();
    }
  }
Verify that the Online config Changes on the HRegionServer side are actually happening. We should
add tests for important configurations which will be changed online.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionServerOnlineConfigChange.java