| /** |
| * 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.hadoop.streaming; |
| |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.util.ToolRunner; |
| |
| /** The main entry point. Usually invoked with the script |
| * bin/hadoop jar hadoop-streaming.jar args. |
| */ |
| public class HadoopStreaming { |
| |
| public static void main(String[] args) throws Exception { |
| if (args.length < 1) { |
| System.err.println("No Arguments Given!"); |
| printUsage(); |
| System.exit(1); |
| } |
| int returnStatus = 0; |
| String cmd = args[0]; |
| String[] remainingArgs = Arrays.copyOfRange(args, 1, args.length); |
| if (cmd.equalsIgnoreCase("dumptb")) { |
| DumpTypedBytes dumptb = new DumpTypedBytes(); |
| returnStatus = ToolRunner.run(dumptb, remainingArgs); |
| } else if (cmd.equalsIgnoreCase("loadtb")) { |
| LoadTypedBytes loadtb = new LoadTypedBytes(); |
| returnStatus = ToolRunner.run(loadtb, remainingArgs); |
| } else if (cmd.equalsIgnoreCase("streamjob")) { |
| StreamJob job = new StreamJob(); |
| returnStatus = ToolRunner.run(job, remainingArgs); |
| } else { // for backward compatibility |
| StreamJob job = new StreamJob(); |
| returnStatus = ToolRunner.run(job, args); |
| } |
| if (returnStatus != 0) { |
| System.err.println("Streaming Command Failed!"); |
| System.exit(returnStatus); |
| } |
| } |
| |
| private static void printUsage() { |
| System.out.println("Usage: $HADOOP_PREFIX/bin/hadoop jar hadoop-streaming.jar" |
| + " [options]"); |
| System.out.println("Options:"); |
| System.out.println(" dumptb <glob-pattern> Dumps all files that match the" |
| + " given pattern to "); |
| System.out.println(" standard output as typed " + |
| "bytes."); |
| System.out.println(" loadtb <path> Reads typed bytes from standard input" + |
| " and stores them in"); |
| System.out.println(" a sequence file in the specified path"); |
| System.out.println(" [streamjob] <args> Runs streaming job with given" + |
| " arguments"); |
| } |
| } |