标签:add highlight ring code 词频统计 src 文件内容 文档 技术分享
通过hadoop上的hive完成WordCount
启动hadoop
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start - all .sh |
Hdfs上创建文件夹
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hdfs dfs - mkdir songinput hdfs dfs - ls / user / hadoop |
上传文件至hdfs:
下载歌词songs.txt保存在~/hadoop里,查询目录
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cd ~ / hadoop ls |
上传至hdfs
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hdfs dfs - put . / songs.txt songinput hdfs dfs - ls / user / hadoop / songinput |
启动Hive
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hive |
创建原始文档表
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create table docs(line string);<br>show tables; |
导入文件内容到表docs并查看
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load data inpath ‘/user/hadoop/songinput/songs.txt‘ overwrite into table docs;<br>select * from docs; |
用HQL进行词频统计,结果放在表word_count里
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create table word_count as select word,count( 1 ) from (select explode(split(line, ‘ ‘ )) as word from docs) word group by word; |
查看统计结果
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select * from word_count; |
标签:add highlight ring code 词频统计 src 文件内容 文档 技术分享
原文地址:https://www.cnblogs.com/xjh602545141/p/9053077.html