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概述

用mapreduce的方法在hadoop平台上，在数据文件中筛选出广东省2007年-2017年中，每一年发电量最高的月份的发电量

运行

1.配置JDK，安装hadoop

2.启动并验证hadoop

/usr/local/hadoop/sbin/start-dfs.sh 
/usr/local/hadoop/sbin/start-yarn.sh
jps

3.在hdfs 上创建输入文件夹MaxEleInput，并把数据文件放进去

/usr/local/hadoop/bin/hdfs dfs -mkdir /MaxEleInput
/usr/local/hadoop/bin/hdfs dfs -put GenerateEleData.txt /MaxEleInput(在Generation.txt所在目录下)

4.运行MaxEle程序

/usr/local/hadoop/bin/hadoop jar MaxEle /MaxEleInput /MaxEleOutput(在jar包所在目录下)

5.查看输出文件及其结果

/usr/local/hadoop/bin/hdfs dfs -cat /MaxEleOutput/*

浏览器进入http://192.168.142.128:50070/explorer.html#/output 可以查看文件(50070前的地址为master的ip地址)

参考资料

数据来源

http://data.stats.gov.cn/easyquery.htm?cn=E0101

参考书目

《Hadoop权威指南》

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