@Override
      public TSaslServerTransport.Factory createSaslServerTransportFactory(Map<String, String> saslProps) {
        TSaslServerTransport.Factory transFactory =
          new TSaslServerTransport.Factory();
        transFactory.addServerDefinition(AuthMethod.DIGEST.getMechanismName(),
            null, SaslRpcServer.SASL_DEFAULT_REALM,
            saslProps,
            new SaslDigestCallbackHandler(secretManager));

        return transFactory;
      }
set to true when metastore token manager has intitialized token manager
through call to HadoopThriftAuthBridge23.Server.startDelegationTokenSecretManager
itests/hive-unit-hadoop2/src/test/java/org/apache/hadoop/hive/metastore/security/TestHadoopAuthBridge23.java