edu.uci.ics.asterix.test.runtime.HDFSCluster.java Source code

Introduction

Here is the source code for edu.uci.ics.asterix.test.runtime.HDFSCluster.java

Source

/*
 * Copyright 2009-2013 by The Regents of the University of California
 * Licensed 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 from
 *
 *     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 edu.uci.ics.asterix.test.runtime;

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

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.JobConf;

import edu.uci.ics.asterix.external.dataset.adapter.HDFSAdapter;

/**
 * Manages a Mini (local VM) HDFS cluster with a configured number of datanodes.
 *
 * @author ramangrover29
 */
@SuppressWarnings("deprecation")
public class HDFSCluster {

    private static final String PATH_TO_HADOOP_CONF = "src/test/resources/hadoop/conf";
    private static final int nameNodePort = 31888;
    private static final String DATA_PATH = "data/hdfs";
    private static final String HDFS_PATH = "/asterix";
    private static final HDFSCluster INSTANCE = new HDFSCluster();

    private MiniDFSCluster dfsCluster;
    private int numDataNodes = 2;
    private JobConf conf = new JobConf();
    private FileSystem dfs;

    public static HDFSCluster getInstance() {
        return INSTANCE;
    }

    private HDFSCluster() {

    }

    /**
     * Instantiates the (Mini) DFS Cluster with the configured number of datanodes.
     * Post instantiation, data is laoded to HDFS.
     * Called prior to running the Runtime test suite.
     */
    public void setup() throws Exception {
        conf.addResource(new Path(PATH_TO_HADOOP_CONF + "/core-site.xml"));
        conf.addResource(new Path(PATH_TO_HADOOP_CONF + "/mapred-site.xml"));
        conf.addResource(new Path(PATH_TO_HADOOP_CONF + "/hdfs-site.xml"));
        cleanupLocal();
        //this constructor is deprecated in hadoop 2x 
        //dfsCluster = new MiniDFSCluster(nameNodePort, conf, numDataNodes, true, true, StartupOption.REGULAR, null);
        MiniDFSCluster.Builder build = new MiniDFSCluster.Builder(conf);
        build.nameNodePort(nameNodePort);
        build.numDataNodes(numDataNodes);
        build.startupOption(StartupOption.REGULAR);
        dfsCluster = build.build();
        dfs = FileSystem.get(conf);
        loadData();
    }

    private void loadData() throws IOException {
        Path destDir = new Path(HDFS_PATH);
        dfs.mkdirs(destDir);
        File srcDir = new File(DATA_PATH);
        File[] listOfFiles = srcDir.listFiles();
        for (File srcFile : listOfFiles) {
            Path path = new Path(srcFile.getAbsolutePath());
            dfs.copyFromLocalFile(path, destDir);
        }
    }

    private void cleanupLocal() throws IOException {
        // cleanup artifacts created on the local file system
        FileSystem lfs = FileSystem.getLocal(new Configuration());
        lfs.delete(new Path("build"), true);
        System.setProperty("hadoop.log.dir", "logs");
    }

    public void cleanup() throws Exception {
        if (dfsCluster != null) {
            dfsCluster.shutdown();
            cleanupLocal();
        }
    }

    public static void main(String[] args) throws Exception {
        HDFSCluster cluster = new HDFSCluster();
        cluster.setup();
        JobConf conf = configureJobConf();
        FileSystem fs = FileSystem.get(conf);
        InputSplit[] inputSplits = conf.getInputFormat().getSplits(conf, 0);
        for (InputSplit split : inputSplits) {
            System.out.println("split :" + split);
        }
        //   cluster.cleanup();
    }

    private static JobConf configureJobConf() throws Exception {
        JobConf conf = new JobConf();
        String hdfsUrl = "hdfs://127.0.0.1:31888";
        String hdfsPath = "/asterix/extrasmalltweets.txt";
        conf.set("fs.default.name", hdfsUrl);
        conf.set("fs.hdfs.impl", "org.apache.hadoop.hdfs.DistributedFileSystem");
        conf.setClassLoader(HDFSAdapter.class.getClassLoader());
        conf.set("mapred.input.dir", hdfsPath);
        conf.set("mapred.input.format.class", "org.apache.hadoop.mapred.TextInputFormat");
        return conf;
    }

}