| /* |
| * 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.pig.impl.streaming; |
| |
| import static org.apache.pig.PigConfiguration.PIG_STREAMING_ENVIRONMENT; |
| |
| import java.io.File; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.pig.impl.util.UDFContext; |
| |
| public class StreamingUtil { |
| private static Log LOG = LogFactory.getLog(StreamingUtil.class); |
| |
| private static final String BASH = "bash"; |
| private static final String PATH = "PATH"; |
| |
| /** |
| * Create an external process for StreamingCommand command. |
| * |
| * @param command |
| * @return |
| */ |
| public static ProcessBuilder createProcess(StreamingCommand command) { |
| // Set the actual command to run with 'bash -c exec ...' |
| List<String> cmdArgs = new ArrayList<String>(); |
| String[] argv = command.getCommandArgs(); |
| |
| StringBuffer argBuffer = new StringBuffer(); |
| for (String arg : argv) { |
| argBuffer.append(arg); |
| argBuffer.append(" "); |
| } |
| String argvAsString = argBuffer.toString(); |
| |
| if (System.getProperty("os.name").toUpperCase().startsWith("WINDOWS")) { |
| cmdArgs.add("cmd"); |
| cmdArgs.add("/c"); |
| cmdArgs.add(argvAsString); |
| } else { |
| cmdArgs.add(BASH); |
| cmdArgs.add("-c"); |
| StringBuffer sb = new StringBuffer(); |
| sb.append("exec "); |
| sb.append(argvAsString); |
| cmdArgs.add(sb.toString()); |
| } |
| |
| // Start the external process |
| ProcessBuilder processBuilder = new ProcessBuilder(cmdArgs |
| .toArray(new String[cmdArgs.size()])); |
| setupEnvironment(processBuilder); |
| return processBuilder; |
| } |
| |
| /** |
| * Set up the run-time environment of the managed process. |
| * |
| * @param pb |
| * {@link ProcessBuilder} used to exec the process |
| */ |
| private static void setupEnvironment(ProcessBuilder pb) { |
| String separator = ":"; |
| Configuration conf = UDFContext.getUDFContext().getJobConf(); |
| Map<String, String> env = pb.environment(); |
| addJobConfToEnvironment(conf, env); |
| |
| // Add the current-working-directory to the $PATH |
| File dir = pb.directory(); |
| String cwd = (dir != null) ? dir.getAbsolutePath() : System |
| .getProperty("user.dir"); |
| |
| String envPath = env.get(PATH); |
| if (envPath == null) { |
| envPath = cwd; |
| } else { |
| envPath = envPath + separator + cwd; |
| } |
| env.put(PATH, envPath); |
| } |
| |
| protected static void addJobConfToEnvironment(Configuration conf, Map<String, String> env) { |
| String propsToSend = conf.get(PIG_STREAMING_ENVIRONMENT); |
| LOG.debug("Properties to ship to streaming environment set in "+PIG_STREAMING_ENVIRONMENT+": " + propsToSend); |
| if (propsToSend == null) { |
| return; |
| } |
| |
| for (String prop : propsToSend.split(",")) { |
| String value = conf.get(prop); |
| if (value == null) { |
| LOG.warn("Property set in "+PIG_STREAMING_ENVIRONMENT+" not found in Configuration: " + prop); |
| continue; |
| } |
| LOG.debug("Setting property in streaming environment: " + prop); |
| envPut(env, prop, value); |
| } |
| } |
| |
| private static void envPut(Map<String, String> env, String name, String value) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Add env entry:" + name + "=" + value); |
| } |
| env.put(name, value); |
| } |
| } |