Java tutorial
/* * Copyright 2013 Alec Ten Harmsel * * 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 com.alectenharmsel.research; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.conf.Configured; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.*; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.util.GenericOptionsParser; import org.apache.hadoop.util.Tool; import org.apache.hadoop.util.ToolRunner; public class MoabLicenses extends Configured implements Tool { public int run(String[] args) throws Exception { if (args.length != 2) { System.err.println("Usage: MoabLicenses <input> <output>"); System.exit(-1); } Configuration conf = getConf(); Job job = new Job(conf, "MoabLicenses"); job.setJarByClass(MoabLicenses.class); FileInputFormat.addInputPath(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); job.setMapperClass(MoabLicensesMapper.class); job.setReducerClass(MoabLicensesReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(Text.class); Configuration check = job.getConfiguration(); boolean success = job.waitForCompletion(true); return success ? 0 : 1; } public static void main(String[] args) throws Exception { GenericOptionsParser parser = new GenericOptionsParser(new Configuration(), args); Configuration conf = parser.getConfiguration(); conf.set("mapreduce.output.textoutputformat.separator", ","); int res = ToolRunner.run(conf, new MoabLicenses(), parser.getRemainingArgs()); System.exit(res); } }