@BeforeClass
  public static void setUp() throws Exception {
    UTIL.getConfiguration().set(MasterRegionFactory.TRACKER_IMPL,
      StoreFileTrackerFactory.Trackers.DEFAULT.name());
    // use zk connection registry, as we will shutdown the only master instance which will likely to
    // lead to dead loop
    UTIL.getConfiguration().set(HConstants.CLIENT_CONNECTION_REGISTRY_IMPL_CONF_KEY,
      HConstants.ZK_CONNECTION_REGISTRY_CLASS);
    UTIL.startMiniCluster(1);
    UTIL.createTable(NAME, FAMILY).close();
  }
Make sure we do not loss data after changing SFT implementation
hbase-server/src/test/java/org/apache/hadoop/hbase/master/region/TestChangeSFTForMasterRegion.java