etl.cmd.test.XTestCase.java Source code

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/**
 * 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 etl.cmd.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.URL;
import java.util.ArrayList;
import java.net.UnknownHostException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

import junit.framework.TestCase;
import org.apache.commons.io.FilenameUtils;

import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.MiniMRClientCluster;
import org.apache.hadoop.mapred.MiniMRClientClusterFactory;
import org.apache.hadoop.security.authorize.ProxyUsers;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.oozie.service.ConfigurationService;
import org.apache.oozie.service.HadoopAccessorService;
import org.apache.oozie.service.JPAService;
import org.apache.oozie.service.Services;
import org.apache.oozie.util.IOUtils;
import org.apache.oozie.util.ParamChecker;
import org.apache.oozie.util.XConfiguration;
import org.apache.oozie.util.XLog;

/**
 * Base JUnit <code>TestCase</code> subclass used by all Oozie testcases.
 * <p>
 * This class provides the following functionality:
 * <p>
 * <ul>
 *   <li>Creates a unique test working directory per test method.</li>
 *   <li>Resets changed system properties to their original values after every test.</li>
 *   <li>WaitFor that supports a predicate,to wait for a condition. It has timeout.</li>
 * </ul>
 * <p>
 * The base directory for the test working directory must be specified via
 * the system property <code>oozie.test.dir</code>, there default value is '/tmp'.
 * <p>
 * From within testcases, system properties must be changed using the {@link #setSystemProperty} method.
 */
public abstract class XTestCase extends TestCase {
    private Map<String, String> sysProps;
    private String testCaseDir;
    private String testCaseConfDir;
    private String hadoopVersion;
    protected XLog log = new XLog(LogFactory.getLog(getClass()));

    public static float WAITFOR_RATIO = Float.parseFloat(System.getProperty("oozie.test.waitfor.ratio", "1"));
    protected static final String localActiveMQBroker = "vm://localhost?broker.persistent=false";
    protected static final String ActiveMQConnFactory = "org.apache.activemq.jndi.ActiveMQInitialContextFactory";

    /**
     * System property to specify the parent directory for the 'oozietests' directory to be used as base for all test
     * working directories. </p> If this property is not set, the assumed value is '/tmp'.
     */
    public static final String OOZIE_TEST_DIR = "oozie.test.dir";

    /**
     * System property to specify the Hadoop Job Tracker to use for testing. </p> If this property is not set, the
     * assumed value is 'locahost:9001'.
     */
    public static final String OOZIE_TEST_JOB_TRACKER = "oozie.test.job.tracker";

    /**
     * System property to specify the Hadoop Name Node to use for testing. </p> If this property is not set, the assumed
     * value is 'locahost:9000'.
     */
    public static final String OOZIE_TEST_NAME_NODE = "oozie.test.name.node";

    /**
     * System property to specify the second Hadoop Name Node to use for testing. </p> If this property is not set, the assumed
     * value is 'locahost:9100'.
     */
    public static final String OOZIE_TEST_NAME_NODE2 = "oozie.test.name.node2";

    /**
     * System property to specify the Hadoop Version to use for testing. </p> If this property is not set, the assumed
     * value is "0.20.0"
     */
    public static final String HADOOP_VERSION = "hadoop.version";

    /**
     * System property that specifies the user that test oozie instance runs as.
     * The value of this property defaults to the "${user.name} system property.
     */
    public static final String TEST_OOZIE_USER_PROP = "oozie.test.user.oozie";

    /**
     * System property that specifies the default test user name used by
     * the tests. The defalt value of this property is <tt>test</tt>.
     */
    public static final String TEST_USER1_PROP = "oozie.test.user.test";

    /**
     * System property that specifies an auxilliary test user name used by the
     * tests. The default value of this property is <tt>test2</tt>.
     */
    public static final String TEST_USER2_PROP = "oozie.test.user.test2";

    /**
     * System property that specifies another auxilliary test user name used by
     * the tests. The default value of this property is <tt>test3</tt>.
     */
    public static final String TEST_USER3_PROP = "oozie.test.user.test3";

    /**
     * System property that specifies the test groiup used by the tests.
     * The default value of this property is <tt>testg</tt>.
     */
    public static final String TEST_GROUP_PROP = "oozie.test.group";

    /**
     * System property that specifies the test groiup used by the tests.
     * The default value of this property is <tt>testg</tt>.
     */
    public static final String TEST_GROUP_PROP2 = "oozie.test.group2";

    /**
     * System property that specifies the wait time, in seconds, between testcases before
     * triggering a shutdown. The default value is 10 sec.
     */
    public static final String TEST_MINICLUSTER_MONITOR_SHUTDOWN_WAIT = "oozie.test.minicluster.monitor.shutdown.wait";

    /**
     * Initialize the test working directory. <p> If it does not exist it creates it, if it already exists it deletes
     * all its contents. <p> The test working directory it is not deleted after the test runs.
     *
     * @throws Exception if the test workflow working directory could not be created
     */
    protected void setUp() throws Exception {
        RUNNING_TESTCASES.incrementAndGet();
        super.setUp();
        String baseDir = System.getProperty(OOZIE_TEST_DIR, new File("target/test-data").getAbsolutePath());
        String msg = null;
        File f = new File(baseDir);
        if (!f.isAbsolute()) {
            msg = XLog.format("System property [{0}]=[{1}] must be set to an absolute path", OOZIE_TEST_DIR,
                    baseDir);
        } else {
            if (baseDir.length() < 4) {
                msg = XLog.format("System property [{0}]=[{1}] path must be at least 4 chars", OOZIE_TEST_DIR,
                        baseDir);
            }
        }
        if (msg != null) {
            System.err.println();
            System.err.println(msg);
            System.exit(-1);
        }
        f.mkdirs();
        if (!f.exists() || !f.isDirectory()) {
            System.err.println();
            System.err.println(XLog.format("Could not create test dir [{0}]", baseDir));
            System.exit(-1);
        }
        hadoopVersion = System.getProperty(HADOOP_VERSION, "0.20.0");
        testCaseDir = createTestCaseDir(this, true);

        //setting up Oozie HOME and Oozie conf directory
        setSystemProperty(Services.OOZIE_HOME_DIR, testCaseDir);
        Services.setOozieHome();
        testCaseConfDir = createTestCaseSubDir("conf");

        // load test Oozie site
        String oozieTestDB = System.getProperty("oozie.test.db", "hsqldb");
        String defaultOozieSize = new File("src/test/resources/" + oozieTestDB + "-oozie-site.xml")
                .getAbsolutePath();
        String customOozieSite = System.getProperty("oozie.test.config.file", defaultOozieSize);
        File source = new File(customOozieSite);
        source = source.getAbsoluteFile();
        InputStream oozieSiteSourceStream = null;
        if (source.exists()) {
            oozieSiteSourceStream = new FileInputStream(source);
        } else {
            // If we can't find it, try using the class loader (useful if we're using XTestCase from outside core)
            URL sourceURL = getClass().getClassLoader().getResource(oozieTestDB + "-oozie-site.xml");
            if (sourceURL != null) {
                oozieSiteSourceStream = sourceURL.openStream();
            } else {
                // If we still can't find it, then exit
                System.err.println();
                System.err.println(XLog.format("Custom configuration file for testing does no exist [{0}]",
                        source.getAbsolutePath()));
                System.err.println();
                System.exit(-1);
            }
        }
        // Copy the specified oozie-site file from oozieSiteSourceStream to the test case dir as oozie-site.xml
        Configuration oozieSiteConf = new Configuration(false);
        oozieSiteConf.addResource(oozieSiteSourceStream);
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        InputStream inputStream = classLoader.getResourceAsStream(ConfigurationService.DEFAULT_CONFIG_FILE);
        XConfiguration configuration = new XConfiguration(inputStream);
        String classes = configuration.get(Services.CONF_SERVICE_CLASSES);
        // Disable sharelib service as it cannot find the sharelib jars
        // as maven has target/classes in classpath and not the jar because test phase is before package phase
        // if (System.getProperty("oozie.test.hadoop.minicluster", "true").equals("true"))
        oozieSiteConf.set(Services.CONF_SERVICE_CLASSES,
                classes.replaceAll("org.apache.oozie.service.ShareLibService,", ""));
        // Make sure to create the Oozie DB during unit tests
        oozieSiteConf.set(JPAService.CONF_CREATE_DB_SCHEMA, "true");
        File target = new File(testCaseConfDir, "oozie-site.xml");
        oozieSiteConf.writeXml(new FileOutputStream(target));

        File hadoopConfDir = new File(testCaseConfDir, "hadoop-conf");
        hadoopConfDir.mkdir();
        File actionConfDir = new File(testCaseConfDir, "action-conf");
        actionConfDir.mkdir();
        source = new File("src/test/resources/hadoop-config.xml");
        target = new File(hadoopConfDir, "core-site.xml");
        IOUtils.copyStream(new FileInputStream(source), new FileOutputStream(target));

        if (System.getProperty("oozielocal.log") == null) {
            setSystemProperty("oozielocal.log", "/tmp/oozielocal.log");
        }
        if (System.getProperty("oozie.test.hadoop.security", "simple").equals("kerberos")) {
            System.setProperty("oozie.service.HadoopAccessorService.kerberos.enabled", "true");
        }
        if (System.getProperty("oozie.test.hadoop.minicluster", "true").equals("true")) {
            setUpEmbeddedHadoop(getTestCaseDir());
            // Second cluster is not necessary without the first one
            if (System.getProperty("oozie.test.hadoop.minicluster2", "false").equals("true")) {
                setUpEmbeddedHadoop2();
            }
        }

        if (System.getProperty("oozie.test.db.host") == null) {
            System.setProperty("oozie.test.db.host", "localhost");
        }
        setSystemProperty(ConfigurationService.OOZIE_DATA_DIR, testCaseDir);

        setSystemProperty(HadoopAccessorService.SUPPORTED_FILESYSTEMS, "*");

        if (mrCluster != null) {
            OutputStream os = new FileOutputStream(new File(hadoopConfDir, "core-site.xml"));
            Configuration conf = mrCluster.getConfig();
            conf.writeXml(os);
            os.close();
        }
    }

    /**
     * Clean up the test case.
     */
    protected void tearDown() throws Exception {
        resetSystemProperties();
        sysProps = null;
        testCaseDir = null;
        super.tearDown();
        RUNNING_TESTCASES.decrementAndGet();
        LAST_TESTCASE_FINISHED.set(System.currentTimeMillis());
    }

    /**
     * Return the test working directory. The directory name is the full class name of the test plus the test method
     * name.
     *
     * @return the test working directory path, it is always an absolute path.
     */
    protected String getTestCaseDir() {
        return testCaseDir;
    }

    /**
     * Return the URI for a test file. The returned value is the testDir + concatenated URI.
     *
     * @return the test working directory path, it is always an absolute path and appends the relative path. The
     * reason for the manual parsing instead of an actual File.toURI is because Oozie tests use tokens ${}
     * frequently. Something like URI("c:/temp/${HOUR}").toString() will generate escaped values that will break tests
     */
    protected String getTestCaseFileUri(String relativeUri) {
        String uri = new File(testCaseDir).toURI().toString();

        // truncates '/' if the testCaseDir was provided with a fullpath ended with separator
        if (uri.endsWith("/")) {
            uri = uri.substring(0, uri.length() - 1);
        }

        return uri + "/" + relativeUri;
    }

    /**
     * Return the Oozie configuration directory for the testcase.
     *
     * @return the Oozie configuration directory for the testcase.
     */
    protected String getTestCaseConfDir() {
        return testCaseConfDir;
    }

    public String getHadoopVersion() {
        return hadoopVersion;
    }

    /**
     *  Return the user Id use to run Oozie during the test cases.
     *
     * @return Oozie's user Id for running the test cases.
     */
    public static String getOozieUser() {
        return System.getProperty(TEST_OOZIE_USER_PROP, System.getProperty("user.name"));
    }

    /**
     * Return the defaul test user Id. The user belongs to the test group.
     *
     * @return the user Id.
     */
    protected static String getTestUser() {
        return System.getProperty(TEST_USER1_PROP, "test");
    }

    /**
     * Return an alternate test user Id that belongs
       to the test group.
     *
     * @return the user Id.
     */
    protected static String getTestUser2() {
        return System.getProperty(TEST_USER2_PROP, "test2");
    }

    /**
     * Return an alternate test user Id that does not belong
     * to the test group.
     *
     * @return the user Id.
     */
    protected static String getTestUser3() {
        return System.getProperty(TEST_USER3_PROP, "test3");
    }

    /**
     * Return the test group.
     *
     * @return the test group.
     */
    protected static String getTestGroup() {
        return System.getProperty(TEST_GROUP_PROP, "testg");
    }

    /**
     * Return the alternate test group.
     *
     * @return the test group.
     */
    protected static String getTestGroup2() {
        return System.getProperty(TEST_GROUP_PROP, "testg2");
    }

    /**
     * Return the test working directory.
     * <p>
     * It returns <code>${oozie.test.dir}/oozietests/TESTCLASSNAME/TESTMETHODNAME</code>.
     *
     * @param testCase testcase instance to obtain the working directory.
     * @return the test working directory.
     */
    private String getTestCaseDirInternal(TestCase testCase) {
        ParamChecker.notNull(testCase, "testCase");
        File dir = new File(System.getProperty(OOZIE_TEST_DIR, "target/test-data"));
        dir = new File(dir, "oozietests").getAbsoluteFile();
        dir = new File(dir, testCase.getClass().getName());
        dir = new File(dir, testCase.getName());
        return dir.getAbsolutePath();
    }

    protected void delete(File file) throws IOException {
        ParamChecker.notNull(file, "file");
        if (file.getAbsolutePath().length() < 5) {
            throw new RuntimeException(
                    XLog.format("path [{0}] is too short, not deleting", file.getAbsolutePath()));
        }
        if (file.exists()) {
            if (file.isDirectory()) {
                File[] children = file.listFiles();
                if (children != null) {
                    for (File child : children) {
                        delete(child);
                    }
                }
            }
            if (!file.delete()) {
                throw new RuntimeException(XLog.format("could not delete path [{0}]", file.getAbsolutePath()));
            }
        } else {
            // With a dangling symlink, exists() doesn't return true so try to delete it anyway; we fail silently in case the file
            // truely doesn't exist
            file.delete();
        }
    }

    /**
     * Create the test working directory.
     *
     * @param testCase testcase instance to obtain the working directory.
     * @param cleanup indicates if the directory should be cleaned up if it exists.
     * @return return the path of the test working directory, it is always an absolute path.
     * @throws Exception if the test working directory could not be created or cleaned up.
     */
    private String createTestCaseDir(TestCase testCase, boolean cleanup) throws Exception {
        String testCaseDir = getTestCaseDirInternal(testCase);
        System.out.println();
        System.out.println(XLog.format("Setting testcase work dir[{0}]", testCaseDir));
        if (cleanup) {
            delete(new File(testCaseDir));
        }
        File dir = new File(testCaseDir);
        if (!dir.mkdirs()) {
            throw new RuntimeException(XLog.format("Could not create testcase dir[{0}]", testCaseDir));
        }
        return testCaseDir;
    }

    /**
     * Create a Test case sub directory.
     *
     * @param subDirNames a list of progressively deeper directory names
     * @return the absolute path to the created directory.
     */
    protected String createTestCaseSubDir(String... subDirNames) {
        ParamChecker.notNull(subDirNames, "subDirName");
        if (subDirNames.length == 0) {
            throw new RuntimeException(XLog.format("Could not create testcase subdir ''; it already exists"));
        }

        File dir = new File(testCaseDir);
        for (int i = 0; i < subDirNames.length; i++) {
            ParamChecker.notNull(subDirNames[i], "subDirName[" + i + "]");
            dir = new File(dir, subDirNames[i]);
        }

        if (!dir.mkdirs()) {
            throw new RuntimeException(XLog.format("Could not create testcase subdir[{0}]", dir));
        }
        return dir.getAbsolutePath();
    }

    /**
     * Set a system property for the duration of the method test case.
     * <p>
     * After the test method ends the original value is restored.
     *
     * @param name system property name.
     * @param value value to set.
     */
    protected void setSystemProperty(String name, String value) {
        if (sysProps == null) {
            sysProps = new HashMap<String, String>();
        }
        if (!sysProps.containsKey(name)) {
            String currentValue = System.getProperty(name);
            sysProps.put(name, currentValue);
        }
        if (value != null) {
            System.setProperty(name, value);
        } else {
            System.getProperties().remove(name);
        }
    }

    /**
     * Reset changed system properties to their original values. <p> Called from {@link #tearDown}.
     */
    private void resetSystemProperties() {
        if (sysProps != null) {
            for (Map.Entry<String, String> entry : sysProps.entrySet()) {
                if (entry.getValue() != null) {
                    System.setProperty(entry.getKey(), entry.getValue());
                } else {
                    System.getProperties().remove(entry.getKey());
                }
            }
            sysProps.clear();
        }
    }

    /**
     * A predicate 'closure' used by {@link XTestCase#waitFor} method.
     */
    public static interface Predicate {

        /**
         * Perform a predicate evaluation.
         *
         * @return the boolean result of the evaluation.
         * @throws Exception thrown if the predicate evaluation could not evaluate.
         */
        public boolean evaluate() throws Exception;
    }

    /**
     * Wait for a condition, expressed via a {@link Predicate} to become true.
     *
     * @param timeout maximum time in milliseconds to wait for the predicate to become true.
     * @param predicate predicate waiting on.
     * @return the waited time.
     */
    protected long waitFor(int timeout, Predicate predicate) {
        ParamChecker.notNull(predicate, "predicate");
        XLog log = new XLog(LogFactory.getLog(getClass()));
        long started = System.currentTimeMillis();
        long mustEnd = System.currentTimeMillis() + (long) (WAITFOR_RATIO * timeout);
        long lastEcho = 0;
        try {
            long waiting = mustEnd - System.currentTimeMillis();
            log.debug("Waiting up to [{0}] msec", waiting);
            boolean eval;
            while (!(eval = predicate.evaluate()) && System.currentTimeMillis() < mustEnd) {
                if ((System.currentTimeMillis() - lastEcho) > 1000) {
                    waiting = mustEnd - System.currentTimeMillis();
                    log.debug("Waiting up to [{0}] msec", waiting);
                    lastEcho = System.currentTimeMillis();
                }
                Thread.sleep(1000);
            }
            if (!eval) {
                log.debug("Waiting timed out after [{0}] msec", timeout);
            }
            return System.currentTimeMillis() - started;
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    /**
     * Wait the specified amount of time; the timeout will be scaled by the oozie.test.waitfor.ratio property.
     *
     * @param sleepTime time in milliseconds to wait
     */
    protected void sleep(int sleepTime) {
        waitFor(sleepTime, new Predicate() {
            public boolean evaluate() throws Exception {
                return false;
            }
        });
    }

    /**
     * Return the Hadoop Job Tracker to use for testing. </p> The value is taken from the Java sytem property {@link
     * #OOZIE_TEST_JOB_TRACKER}, if this property is not set, the assumed value is 'locahost:9001'.
     *
     * @return the job tracker URI.
     */
    protected String getJobTrackerUri() {
        return System.getProperty(OOZIE_TEST_JOB_TRACKER, "localhost:9001");
    }

    /**
     * Return the Hadoop Name Node to use for testing. </p> The value is taken from the Java sytem property {@link
     * #OOZIE_TEST_NAME_NODE}, if this property is not set, the assumed value is 'locahost:9000'.
     *
     * @return the name node URI.
     */
    protected String getNameNodeUri() {
        return System.getProperty(OOZIE_TEST_NAME_NODE, "hdfs://localhost:9000");
    }

    /**
     * Return the second Hadoop Name Node to use for testing. </p> The value is taken from the Java sytem property {@link
     * #OOZIE_TEST_NAME_NODE2}, if this property is not set, the assumed value is 'locahost:9100'.
     *
     * @return the second name node URI.
     */
    protected String getNameNode2Uri() {
        return System.getProperty(OOZIE_TEST_NAME_NODE2, "hdfs://localhost:9100");
    }

    public String getKeytabFile() {
        String defaultFile = new File(System.getProperty("user.home"), "oozie.keytab").getAbsolutePath();
        return System.getProperty("oozie.test.kerberos.keytab.file", defaultFile);
    }

    public String getRealm() {
        return System.getProperty("oozie.test.kerberos.realm", "LOCALHOST");
    }

    public String getOoziePrincipal() {
        return System.getProperty("oozie.test.kerberos.oozie.principal", getOozieUser() + "/localhost") + "@"
                + getRealm();
    }

    private static MiniDFSCluster dfsCluster = null;
    private static MiniDFSCluster dfsCluster2 = null;
    private static MiniMRClientCluster mrCluster = null;

    private void setUpEmbeddedHadoop(String testCaseDir) throws Exception {
        if (dfsCluster == null && mrCluster == null) {
            if (System.getProperty("hadoop.log.dir") == null) {
                System.setProperty("hadoop.log.dir", testCaseDir);
            }
            String oozieUser = getOozieUser();
            JobConf conf = createDFSConfig();
            String[] userGroups = new String[] { getTestGroup(), getTestGroup2() };
            UserGroupInformation.createUserForTesting(oozieUser, userGroups);
            UserGroupInformation.createUserForTesting(getTestUser(), userGroups);
            UserGroupInformation.createUserForTesting(getTestUser2(), userGroups);
            UserGroupInformation.createUserForTesting(getTestUser3(), new String[] { "users" });

            try {
                MiniDFSCluster.Builder builder = new MiniDFSCluster.Builder(conf);
                dfsCluster = builder.build();
                FileSystem fileSystem = dfsCluster.getFileSystem();
                fileSystem.mkdirs(new Path("target/test-data"));
                fileSystem.mkdirs(new Path("target/test-data" + "/minicluster/mapred"));
                fileSystem.mkdirs(new Path("/user"));
                fileSystem.mkdirs(new Path("/tmp"));
                fileSystem.mkdirs(new Path("/hadoop/mapred/system"));
                fileSystem.setPermission(new Path("target/test-data"), FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("target/test-data" + "/minicluster"),
                        FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("target/test-data" + "/minicluster/mapred"),
                        FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("/user"), FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("/tmp"), FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("/hadoop/mapred/system"), FsPermission.valueOf("-rwx------"));

                mrCluster = MiniMRClientClusterFactory.create(this.getClass(), 1, conf);
                Configuration jobConf = mrCluster.getConfig();
                System.setProperty(OOZIE_TEST_JOB_TRACKER, jobConf.get("mapreduce.jobtracker.address"));
                String rmAddress = jobConf.get("yarn.resourcemanager.address");
                log.info("Job tracker: " + rmAddress);
                if (rmAddress != null) {
                    System.setProperty(OOZIE_TEST_JOB_TRACKER, rmAddress);
                }
                System.setProperty(OOZIE_TEST_NAME_NODE, jobConf.get("fs.defaultFS"));
                ProxyUsers.refreshSuperUserGroupsConfiguration(conf);
            } catch (Exception ex) {
                shutdownMiniCluster();
                throw ex;
            }
            new MiniClusterShutdownMonitor().start();
        }
    }

    private void setUpEmbeddedHadoop2() throws Exception {
        if (dfsCluster != null && dfsCluster2 == null) {
            // Trick dfs location for MiniDFSCluster since it doesn't accept location as input)
            String testBuildDataSaved = System.getProperty("test.build.data", "build/test/data");
            try {
                System.setProperty("test.build.data", FilenameUtils.concat(testBuildDataSaved, "2"));
                // Only DFS cluster is created based upon current need
                MiniDFSCluster.Builder builder = new MiniDFSCluster.Builder(createDFSConfig());
                dfsCluster2 = builder.build();
                FileSystem fileSystem = dfsCluster2.getFileSystem();
                fileSystem.mkdirs(new Path("target/test-data"));
                fileSystem.mkdirs(new Path("/user"));
                fileSystem.mkdirs(new Path("/tmp"));
                fileSystem.setPermission(new Path("target/test-data"), FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("/user"), FsPermission.valueOf("-rwxrwxrwx"));
                fileSystem.setPermission(new Path("/tmp"), FsPermission.valueOf("-rwxrwxrwx"));
                System.setProperty(OOZIE_TEST_NAME_NODE2, fileSystem.getConf().get("fs.defaultFS"));
            } catch (Exception ex) {
                shutdownMiniCluster2();
                throw ex;
            } finally {
                // Restore previus value
                System.setProperty("test.build.data", testBuildDataSaved);
            }
        }
    }

    private JobConf createDFSConfig() throws UnknownHostException {
        JobConf conf = new JobConf();
        conf.set("dfs.block.access.token.enable", "false");
        conf.set("dfs.permissions", "true");
        conf.set("hadoop.security.authentication", "simple");

        //Doing this because Hadoop 1.x does not support '*' and
        //Hadoop 0.23.x does not process wildcard if the value is
        // '*,127.0.0.1'
        StringBuilder sb = new StringBuilder();
        sb.append("127.0.0.1,localhost");
        for (InetAddress i : InetAddress.getAllByName(InetAddress.getLocalHost().getHostName())) {
            sb.append(",").append(i.getCanonicalHostName());
        }
        conf.set("hadoop.proxyuser." + getOozieUser() + ".hosts", sb.toString());

        conf.set("hadoop.proxyuser." + getOozieUser() + ".groups", getTestGroup());
        conf.set("mapred.tasktracker.map.tasks.maximum", "4");
        conf.set("mapred.tasktracker.reduce.tasks.maximum", "4");

        conf.set("hadoop.tmp.dir", "target/test-data" + "/minicluster");

        // Scheduler properties required for YARN CapacityScheduler to work
        conf.set("yarn.scheduler.capacity.root.queues", "default");
        conf.set("yarn.scheduler.capacity.root.default.capacity", "100");
        // Required to prevent deadlocks with YARN CapacityScheduler
        conf.set("yarn.scheduler.capacity.maximum-am-resource-percent", "0.5");
        return conf;
    }

    private static void shutdownMiniCluster() {
        try {
            if (mrCluster != null) {
                mrCluster.stop();
            }
        } catch (Exception ex) {
            System.out.println(ex);
        }
        try {
            if (dfsCluster != null) {
                dfsCluster.shutdown();
            }
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }

    private static void shutdownMiniCluster2() {
        try {
            if (dfsCluster2 != null) {
                dfsCluster2.shutdown();
            }
        } catch (Exception ex) {
            System.out.println(ex);
        }
    }

    private static final AtomicLong LAST_TESTCASE_FINISHED = new AtomicLong();
    private static final AtomicInteger RUNNING_TESTCASES = new AtomicInteger();

    private static class MiniClusterShutdownMonitor extends Thread {

        public MiniClusterShutdownMonitor() {
            setDaemon(true);
        }

        public void run() {
            long shutdownWait = Long.parseLong(System.getProperty(TEST_MINICLUSTER_MONITOR_SHUTDOWN_WAIT, "10"))
                    * 1000;
            LAST_TESTCASE_FINISHED.set(System.currentTimeMillis());
            while (true) {
                if (RUNNING_TESTCASES.get() == 0) {
                    if (System.currentTimeMillis() - LAST_TESTCASE_FINISHED.get() > shutdownWait) {
                        break;
                    }
                }
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException ex) {
                    break;
                }
            }
            shutdownMiniCluster();
            shutdownMiniCluster2();
        }
    }

    /**
     * Returns a jobconf preconfigured to talk with the test cluster/minicluster.
     * @return a jobconf preconfigured to talk with the test cluster/minicluster.
     */
    protected JobConf createJobConf() throws IOException {
        JobConf jobConf = new JobConf();
        jobConf.set("mapreduce.jobtracker.address", getJobTrackerUri());
        jobConf.set("fs.defaultFS", getNameNodeUri());
        return jobConf;
    }

    /**
     * A 'closure' used by {@link XTestCase#executeWhileJobTrackerIsShutdown} method.
     */
    public static interface ShutdownJobTrackerExecutable {

        /**
         * Execute some code
         *
         * @throws Exception thrown if the executed code throws an exception.
         */
        public void execute() throws Exception;
    }

    /**
     * Execute some code, expressed via a {@link ShutdownJobTrackerExecutable}, while the JobTracker is shutdown. Once the code has
     * finished, the JobTracker is restarted (even if an exception occurs).
     *
     * @param executable The ShutdownJobTrackerExecutable to execute while the JobTracker is shutdown
     */
    protected void executeWhileJobTrackerIsShutdown(ShutdownJobTrackerExecutable executable) {
        Exception ex = null;
        try {
            executable.execute();
        } catch (Exception e) {
            ex = e;
        }
        if (ex != null) {
            throw new RuntimeException(ex);
        }
    }

    protected class TestLogAppender extends AppenderSkeleton {
        private final List<LoggingEvent> log = new ArrayList<LoggingEvent>();

        public boolean requiresLayout() {
            return false;
        }

        protected void append(final LoggingEvent loggingEvent) {
            log.add(loggingEvent);
        }

        public void close() {
        }

        public List<LoggingEvent> getLog() {
            return new ArrayList<LoggingEvent>(log);
        }
    }

    public TestLogAppender getTestLogAppender() {
        return new TestLogAppender();
    }

}