@AfterClass
  public static void shutdownCluster() throws Exception {
    if (CLUSTER != null) {
      CLUSTER.shutdown();
      CLUSTER = null;
    }
    UTIL.shutdownMiniDFSCluster();
    UTIL.shutdownMiniZKCluster();
    UTIL.cleanupTestDir();
  }
Custom provider which can select our custom provider, amongst other tokens which may be
available.
hbase-server/src/test/java/org/apache/hadoop/hbase/security/provider/CustomSaslAuthenticationProviderTestBase.java