Java tutorial
/* * The MIT License * * Copyright (c) 2004-2009, Sun Microsystems, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package hudson.gridmaven.gridlayer; import hudson.remoting.Callable; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hdfs.server.namenode.NameNode; import java.io.File; import java.io.IOException; import java.net.InetSocketAddress; import org.apache.hadoop.fs.Path; /** * Starts a {@link NameNode}. */ class NameNodeStartTask implements Callable<Void, IOException> { private final File hudsonRoot; private final String hdfsUrl; private final int hdfsPort; private boolean format = Boolean.getBoolean("hadoop.format"); NameNodeStartTask(File hudsonRoot, String hdfsUrl, int hdfsPort) { this.hudsonRoot = hudsonRoot; this.hdfsUrl = hdfsUrl; this.hdfsPort = hdfsPort; } public Void call() throws IOException { File hadoopRoot = new File(hudsonRoot, "hadoop"); if (hadoopRoot.mkdirs()) format = true; final Configuration conf = new Configuration(); // location of the name node conf.set("fs.default.name", hdfsUrl); conf.set("dfs.http.address", "0.0.0.0:" + HTTP_PORT); // namespace node stores information here File namedir = new File(hadoopRoot, "namedir"); if (namedir.mkdirs()) format = true; conf.set("dfs.name.dir", namedir.getPath()); // dfs node stores information here File datadir = new File(hadoopRoot, "datadir"); conf.set("dfs.namenode.logging.level", "ALL"); if (datadir.mkdirs()) format = true; conf.set("dfs.data.dir", datadir.getPath()); conf.setInt("dfs.replication", 1); conf.set("dfs.safemode.extension", "1"); conf.set("dfs.block.size", "1048576"); //if(format) { // This will provide format HDFS with every start System.out.println("Formatting HDFS"); NameNode.format(conf); //} System.out.println("Starting namenode"); NameNode.createNameNode(new String[0], conf); return null; } private static final long serialVersionUID = 1L; public static final int HTTP_PORT = 50070; }