@AfterClass
  public static void shutDownMiniCluster() throws Exception {
    if (CLUSTER != null) {
      CLUSTER.shutdown();
      CLUSTER.join();
    }
    if (KDC != null) {
      KDC.stop();
    }
    UTIL.shutdownMiniCluster();
  }
Helper method to shut down the cluster (if running)
hbase-server/src/test/java/org/apache/hadoop/hbase/http/TestInfoServersACL.java