org.apache.zeppelin.integration.MiniHadoopCluster.java Source code

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Here is the source code for org.apache.zeppelin.integration.MiniHadoopCluster.java

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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 org.apache.zeppelin.integration;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.server.MiniYARNCluster;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 *
 * Util class for creating a Mini Hadoop cluster in local machine to test scenarios that needs
 * hadoop cluster.
 */
public class MiniHadoopCluster {

    private static Logger LOGGER = LoggerFactory.getLogger(MiniHadoopCluster.class);

    private Configuration hadoopConf;
    private MiniDFSCluster dfsCluster;
    private MiniYARNCluster yarnCluster;
    private String configPath = new File("target/tests/hadoop_conf").getAbsolutePath();

    @BeforeClass
    public void start() throws IOException {
        LOGGER.info("Starting MiniHadoopCluster ...");
        this.hadoopConf = new Configuration();
        new File(configPath).mkdirs();
        // start MiniDFSCluster
        this.dfsCluster = new MiniDFSCluster.Builder(hadoopConf).numDataNodes(2).format(true).waitSafeMode(true)
                .build();
        this.dfsCluster.waitActive();
        saveConfig(hadoopConf, configPath + "/core-site.xml");

        // start MiniYarnCluster
        YarnConfiguration baseConfig = new YarnConfiguration(hadoopConf);
        baseConfig.set("yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage", "95");
        this.yarnCluster = new MiniYARNCluster(getClass().getName(), 2, 1, 1);
        yarnCluster.init(baseConfig);

        // Install a shutdown hook for stop the service and kill all running applications.
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                yarnCluster.stop();
            }
        });

        yarnCluster.start();

        // Workaround for YARN-2642.
        Configuration yarnConfig = yarnCluster.getConfig();
        long start = System.currentTimeMillis();
        while (System.currentTimeMillis() - start < 30 * 1000) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                throw new IOException(e);
            }
            if (!yarnConfig.get(YarnConfiguration.RM_ADDRESS).split(":")[1].equals("0")) {
                break;
            }
        }
        if (yarnConfig.get(YarnConfiguration.RM_ADDRESS).split(":")[1].equals("0")) {
            throw new IOException("RM not up yes");
        }

        LOGGER.info("RM address in configuration is " + yarnConfig.get(YarnConfiguration.RM_ADDRESS));
        saveConfig(yarnConfig, configPath + "/yarn-site.xml");
    }

    protected void saveConfig(Configuration conf, String dest) throws IOException {
        Configuration redacted = new Configuration(conf);
        // This setting references a test class that is not available when using a real Spark
        // installation, so remove it from client configs.
        redacted.unset("net.topology.node.switch.mapping.impl");

        FileOutputStream out = new FileOutputStream(dest);
        try {
            redacted.writeXml(out);
        } finally {
            out.close();
        }
        LOGGER.info("Save configuration to " + dest);
    }

    @AfterClass
    public void stop() {
        if (this.yarnCluster != null) {
            this.yarnCluster.stop();
        }
        if (this.dfsCluster != null) {
            this.dfsCluster.shutdown();
        }
    }

    public String getConfigPath() {
        return configPath;
    }

    public MiniYARNCluster getYarnCluster() {
        return yarnCluster;
    }
}