Java tutorial
/** * 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 com.jimmy.ibeifeng.hdfs_api; import java.io.IOException; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer.Context; import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; import org.apache.hadoop.util.ToolRunner; public class pv extends AbstractJob { public static void main(String[] args) throws Exception { ToolRunner.run(new pv(), args); } public int run(String[] arg0) throws Exception { Path input = new Path("hdfs://192.168.1.113:9000/user/jimmy/pv/input"); Path output = new Path("hdfs://192.168.1.113:9000/user/jimmy/pv/output"); JobUtil.delete(super.getConf(), output); Job job = prepareJob(input, output, TextInputFormat.class, TokenizerMapper.class, Text.class, Text.class, IntSumReducer.class, Text.class, Text.class, TextOutputFormat.class); return job.waitForCompletion(true) ? 0 : 1; } }