Github user mxm commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2275#discussion_r72449798
  
    --- Diff: 
flink-test-utils-parent/flink-test-utils/src/main/java/org/apache/flink/test/util/SecureTestEnvironment.java
 ---
    @@ -0,0 +1,207 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.flink.test.util;
    +
    +import org.apache.flink.configuration.ConfigConstants;
    +import org.apache.flink.runtime.security.SecurityContext;
    +import org.apache.hadoop.fs.FileUtil;
    +import org.apache.hadoop.minikdc.MiniKdc;
    +import org.junit.rules.TemporaryFolder;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import static org.junit.Assert.assertTrue;
    +
    +import javax.annotation.Nullable;
    +import java.io.File;
    +import java.util.HashMap;
    +import java.util.Map;
    +import java.util.Properties;
    +
    +/**
    + * Helper {@link SecureTestEnvironment} to handle MiniKDC lifecycle.
    + * This class can be used to start/stop MiniKDC and create secure 
configurations for MiniDFSCluster
    + * and MiniYarn
    + */
    +
    +public class SecureTestEnvironment {
    +
    +   protected static final Logger LOG = 
LoggerFactory.getLogger(SecureTestEnvironment.class);
    +
    +   private static MiniKdc kdc;
    +
    +   private static String testKeytab = null;
    +
    +   private static String testPrincipal = null;
    +
    +   private static String testZkServerPrincipal = null;
    +
    +   private static String hadoopServicePrincipal = null;
    +
    +   private static File baseDirForSecureRun = null;
    +
    +   public static void prepare(TemporaryFolder tempFolder) {
    +
    +           try {
    +                   baseDirForSecureRun = tempFolder.newFolder();
    +
    +                   LOG.info("Base Directory for Secure Environment: {}", 
baseDirForSecureRun);
    +
    +                   FileUtil.fullyDelete(baseDirForSecureRun);
    +
    +                   assertTrue(baseDirForSecureRun.mkdirs());
    +
    +                   Properties kdcConf = MiniKdc.createConf();
    +
    +                   kdc = new MiniKdc(kdcConf, baseDirForSecureRun);
    +
    +                   kdc.start();
    +
    +                   LOG.info("Started Mini KDC");
    +
    +                   File keytabFile = new File(baseDirForSecureRun, 
"test-users.keytab");
    +
    +                   testKeytab = keytabFile.getAbsolutePath();
    +
    +                   testZkServerPrincipal = "zookeeper/127.0.0.1";
    +
    +                   hadoopServicePrincipal = "hadoop/localhost";
    +
    +                   testPrincipal = "client/localhost";
    +
    +                   kdc.createPrincipal(keytabFile, testPrincipal, 
testZkServerPrincipal, hadoopServicePrincipal);
    --- End diff --
    
    Why always a new line above? :)


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