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Hive 底层执行流程-沧浪之水
source link: https://blog.51cto.com/14309075/2399484
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Hive并不是简简单单写SQL，因为我们要进行层层调优，如果连Hive的内部运行机制都搞不清，那么hive对我们来说仅仅是一个黑箱，高效率的调优无从谈起，所以我们很有必要了解下Hive是如何将SQL转化为MapReduce任务的呢？
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