I got stuck for a few days because I want to create a custom map reduce program based on my query on hive, I found not many examples after googling and I'm still confused about the rule.

What is the rule to create my custom mapreduce program, how about the mapper and reducer class?

Can anyone provide any solution?

I want to develop this program in Java, but I'm still stuck ,and then when formatting output in collector, how do I format the result in mapper and reducer class?

Does anybody want to give me some example and explanation about this kind of stuff?

hadoop mapreduce hive
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