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BD-exp-3/command.md
fly6516 2912a4f86a docs(BD-exp-3): 添加项目文档和示例代码 
- 新增 App.java 和 AppTest.java 文件作为项目示例
- 添加 command.md、origin.md 和 sql.md 文件，包含项目相关命令和 SQL 语句
- 创建 pom.xml 文件定义项目依赖
2025-03-16 19:01:24 +08:00

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sed 's/::/,/g' users.dat > users_cleaned.dat sed 's/::/,/g' movies.dat > movies_cleaned.dat sed 's/::/,/g' ratings.dat > ratings_cleaned.dat

hadoop fs -rm /user/hadoop/movie_data/users.dat hadoop fs -rm /user/hadoop/movie_data/movies.dat hadoop fs -rm /user/hadoop/movie_data/ratings.dat

hadoop fs -mkdir /user/hadoop/movie_data/users hadoop fs -mkdir /user/hadoop/movie_data/movies hadoop fs -mkdir /user/hadoop/movie_data/ratings

hadoop fs -put users_cleaned.dat /user/hadoop/movie_data/users/users.dat hadoop fs -put movies_cleaned.dat /user/hadoop/movie_data/movies/movies.dat hadoop fs -put ratings_cleaned.dat /user/hadoop/movie_data/ratings/ratings.dat