function map(String name, String document): // name: document name // document: document contents for each word w in document: emit (w, ) function reduce(String word, Iterator partialCounts): // word: a word // partialCounts: a list of aggregated par…
按照文档:http://www.micmiu.com/bigdata/hadoop/hadoop2x-eclipse-mapreduce-demo/安装配置好Eclipse后,运行WordCount程序报错: log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j…
摘要:MapReduce程序进行单词计数. 关键词:MapReduce程序 单词计数 数据源:人工构造英文文档file1.txt,file2.txt. file1.txt 内容 Hello Hadoop I am studying the Hadoop technology file2.txt内容 Hello world The world is very beautiful I love the Hadoop and world 问题描…