@BeforeClass
  public static void setUpBeforeClass() throws Exception {
    conf = hbaseTestingUtility.getConfiguration();
    hbaseTestingUtility.startMiniCluster(2);
    t1 = hbaseTestingUtility.createTable(
      TableDescriptorBuilder.newBuilder(TABLE1).setMaxFileSize(MAX_FILE_SIZE).build(),
      new byte[][] { COLUMN_FAMILY1 }, conf);
  }
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