Java tutorial
/*********************************************************************************************************************** * Copyright (C) 2010-2014 by the Stratosphere project (http://stratosphere.eu) * * 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 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 eu.stratosphere.yarn; import java.io.IOException; import java.security.PrivilegedAction; import java.util.Arrays; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.security.UserGroupInformation; import org.apache.hadoop.security.token.Token; import org.apache.hadoop.security.token.TokenIdentifier; import org.apache.hadoop.yarn.api.ApplicationConstants.Environment; import eu.stratosphere.nephele.taskmanager.TaskManager; public class YarnTaskManagerRunner { private static final Log LOG = LogFactory.getLog(YarnTaskManagerRunner.class); public static void main(final String[] args) throws IOException { Map<String, String> envs = System.getenv(); final String yarnClientUsername = envs.get(Client.ENV_CLIENT_USERNAME); final String localDirs = envs.get(Environment.LOCAL_DIRS.key()); // configure local directory final String[] newArgs = Arrays.copyOf(args, args.length + 2); newArgs[newArgs.length - 2] = "-" + TaskManager.ARG_CONF_DIR; newArgs[newArgs.length - 1] = localDirs; LOG.info("Setting log path " + localDirs); LOG.info("YARN daemon runs as '" + UserGroupInformation.getCurrentUser().getShortUserName() + "' setting" + " user to execute Stratosphere TaskManager to '" + yarnClientUsername + "'"); UserGroupInformation ugi = UserGroupInformation.createRemoteUser(yarnClientUsername); for (Token<? extends TokenIdentifier> toks : UserGroupInformation.getCurrentUser().getTokens()) { ugi.addToken(toks); } ugi.doAs(new PrivilegedAction<Object>() { @Override public Object run() { try { TaskManager.main(newArgs); } catch (Exception e) { e.printStackTrace(); } return null; } }); } }