Hadoop|Hadoop——练习1(统计单词个数) linux|hadoop

1、启动Hadoop

cd /opt
cd hadoop
./sbin/start-all.sh
jps

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2、创建一个txt,存入英文单词

vi blue
i(输入)——>est键(退出)——wq(保存)

3、使用 put 操作将“blue”文件上传到 HDFS 的根目录

hadoop fs -put blue /blue

4、使用 jar 操作运行 Hadoop 中自带的 jar 进行单词计数

cd hadoop/share/hadoop/mapreduce/
hadoop jar hadoop-mapreduce-examples-2.7.1.jar wordcount /blue /out

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5、使用 cat 查看统计结果

hadoop fs -cat /out/part-r-00000

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*戳爷版BLUE歌词

Love It's hard I know All your lIghts are red but I'm green to Go Used to see you hIgh now you're only low All your lIghts are red but I'm green to Go I want you I'll colour me blue Anything It takes to make you stay Only seeing myself When I'm loOKing up at you I want you I'll colour me blue Anything It takes to make you stay Only seeing myself When I'm loOKing up at you I can't say no though the lIghts are on There's nobody home Swore I'd never lose control Then I fell in love wIth a heart that beats so slow I want you I'll colour me blue Anything It takes to make you stay Only seeing myself When I'm loOKing up at you I want you I'll colour me blue Anything It takes to make you stay Only seeing myself When I'm loOKing up at you I know you're seeing black and whIte So I'll paint you a clear-blue sky WIthout you I am colour-blind It's raining every tIme I open my eyes I know you're seeing black and whIte So I'll paint you a clear-blue sky WIthout you I am colour-blind It's raining every tIme I open my eyes I want you I'll colour me blue Only seeing myself When I'm loOKing up at you When I'm loOKing up at you I want you I'll colour me blue Anything It takes to make you stay Only seeing myself When I'm loOKing up at you When I'm loOKing up at you I want you I'll colour me blue Anything It takes to make you stay Only seeing myself When I'm loOKing up at you I want you I'll colour me blue Anything It takes to make you stay

7、错误：重复上上面的操作，创建一个新的hello.txt，发现不能统计单词数目