大数据Spark “蘑菇云”行动第94课：Hive性能调优之Mapper和Reducer设置、队列设置和并行执行、JVM重用和动态分区、Join调优

大数据Spark “蘑菇云”行动第94课：Hive性能调优之Mapper和Reducer设置、队列设置和并行执行、JVM重用和动态分区、Join调优 hive> show databases; use default; show tables; select * from employeesforhaving; hive> EXPLAIN select * from employeesforhav

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