| /** |
| * 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.mapreduce; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.io.IntWritable; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; |
| import org.apache.hadoop.mapreduce.lib.map.TokenCounterMapper; |
| import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; |
| import org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer; |
| |
| public class CombinerJobCreator { |
| |
| public static Job createJob(String[] args) throws Exception { |
| Configuration conf = new Configuration(); |
| int numReduces = 1; |
| String indir = null; |
| String outdir = null; |
| boolean mapoutputCompressed = false; |
| boolean outputCompressed = false; |
| for (int i = 0; i < args.length; ++i) { |
| try { |
| if ("-r".equals(args[i])) { |
| numReduces = Integer.parseInt(args[++i]); |
| } else if ("-indir".equals(args[i])) { |
| indir = args[++i]; |
| } else if ("-outdir".equals(args[i])) { |
| outdir = args[++i]; |
| } else if ("-mapoutputCompressed".equals(args[i])) { |
| mapoutputCompressed = Boolean.valueOf(args[++i]).booleanValue(); |
| } else if ("-outputCompressed".equals(args[i])) { |
| outputCompressed = Boolean.valueOf(args[++i]).booleanValue(); |
| } |
| } catch (NumberFormatException except) { |
| System.out.println("ERROR: Integer expected instead of " + args[i]); |
| return null; |
| } catch (ArrayIndexOutOfBoundsException except) { |
| System.out.println("ERROR: Required parameter missing from " |
| + args[i - 1]); |
| return null; |
| } |
| } |
| conf.setBoolean(MRJobConfig.MAP_OUTPUT_COMPRESS, mapoutputCompressed); |
| conf.setBoolean(FileOutputFormat.COMPRESS, outputCompressed); |
| |
| Job job = new Job(conf); |
| job.setJobName("GridmixCombinerJob"); |
| |
| // the keys are words (strings) |
| job.setOutputKeyClass(Text.class); |
| // the values are counts (ints) |
| job.setOutputValueClass(IntWritable.class); |
| |
| job.setMapperClass(TokenCounterMapper.class); |
| job.setCombinerClass(IntSumReducer.class); |
| job.setReducerClass(IntSumReducer.class); |
| |
| job.setNumReduceTasks(numReduces); |
| if (indir != null) { |
| FileInputFormat.setInputPaths(job, indir); |
| } |
| if (outdir != null) { |
| FileOutputFormat.setOutputPath(job, new Path(outdir)); |
| } |
| return job; |
| } |
| } |