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MapReduce 与 JOIN | 遐想的空中宫殿 #27

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skyleaworlder opened this issue Mar 16, 2021 · 0 comments
Open

MapReduce 与 JOIN | 遐想的空中宫殿 #27

skyleaworlder opened this issue Mar 16, 2021 · 0 comments
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https://skyleaworlder.github.io/2021/03/15/MapReduce-JOIN/

《数据密集型应用》里面的一页，这里只是再做诠释而已。 两个表格，一个 User Activity Mapper 以及一个 User Database Mapper 表，可以这么定义： 123456789101112131415CREATE TABLE user_activity ( u_id INT, status VARCHAR(10) DEFAULT "loaded", ur
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