本文演示如何在Eclipse中开发一个Map/Reduce项目: 1、环境说明 Hadoop2.2.0 Eclipse?Juno SR2 Hadoop2.x-eclipse-plugin 插件的编译安装配置的过程参考:http://www.micmiu.com/bigdata/hadoop/hadoop2-x-eclipse-plugin-build-install/ 2、新建MR工程 依次
package com.micmiu.mr; /** * 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. */ import java.io.IOException; import java.util.StringTokenizer; 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.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.util.GenericOptionsParser; public class WordCount { public static class TokenizerMapper extends Mapper
Hi Michael welcome to Hadoop more see micmiu.com
Hi Michael welcome to BigData more see micmiu.com
Hi Michael welcome to Spark more see micmiu.com
micmiu-mbp:Downloads micmiu$ hdfs dfs -copyFromLocal micmiu-*.txt /user/micmiu/test/input micmiu-mbp:Downloads micmiu$ hdfs dfs -ls /user/micmiu/test/input Found 3 items -rw-r--r-- 1 micmiu supergroup 50 2014-04-15 14:53 /user/micmiu/test/input/micmiu-01.txt -rw-r--r-- 1 micmiu supergroup 50 2014-04-15 14:53 /user/micmiu/test/input/micmiu-02.txt -rw-r--r-- 1 micmiu supergroup 49 2014-04-15 14:53 /user/micmiu/test/input/micmiu-03.txt micmiu-mbp:Downloads micmiu$
原文地址:eclipse中开发Hadoop2.x的Map/Reduce项目, 感谢原作者分享。