pl.edu.icm.coansys.heeut.MiniCluster.java Source code

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Here is the source code for pl.edu.icm.coansys.heeut.MiniCluster.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 pl.edu.icm.coansys.heeut;

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

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.mapred.MiniMRCluster;

public class MiniCluster extends MiniGenericCluster {

    private MiniMRCluster m_mr = null;

    public MiniCluster() {
        super();
    }

    @Override
    protected void setupMiniDfsAndMrClusters() {
        try {
            final int dataNodes = 2; // There will be 2 data nodes
            final int taskTrackers = 2; // There will be 2 task tracker nodes

            System.setProperty("hadoop.log.dir", "test-logs");
            // Create the configuration hadoop-site.xml file
            File conf_dir = new File(System.getProperty("user.home"), "pigtest/conf/");
            conf_dir.mkdirs();
            File conf_file = new File(conf_dir, "hadoop-site.xml");

            conf_file.delete();

            // Builds and starts the mini dfs and mapreduce clusters
            Configuration config = new Configuration();

            m_dfs = new MiniDFSCluster(config, dataNodes, true, null);
            m_fileSys = m_dfs.getFileSystem();
            m_mr = new MiniMRCluster(taskTrackers, m_fileSys.getUri().toString(), 1);

            // Write the necessary config info to hadoop-site.xml
            m_conf = m_mr.createJobConf();
            m_conf.setInt("mapred.submit.replication", 2);
            m_conf.set("dfs.datanode.address", "0.0.0.0:0");
            m_conf.set("dfs.datanode.http.address", "0.0.0.0:0");
            m_conf.set("mapred.map.max.attempts", "2");
            m_conf.set("mapred.reduce.max.attempts", "2");
            m_conf.writeXml(new FileOutputStream(conf_file));

            // Set the system properties needed by Pig
            System.setProperty("cluster", m_conf.get("mapred.job.tracker"));
            System.setProperty("namenode", m_conf.get("fs.default.name"));
            System.setProperty("junit.hadoop.conf", conf_dir.getPath());

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void shutdownMiniMrClusters() {
        if (m_mr != null) {
            m_mr.shutdown();
        }
        m_mr = null;
    }
}