How to use the hadoop map function

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After the execution of the map function, there are a total of four map outputs, namely

Partition. There is only one partition by default.

Sort

Grouping puts the value of the same key into a collection, and each group calls the reduce function once

Reduction (optional)

The temporary results of the output of the map task are stored on linux disk.

Common configurations:

Hdfs-site.xml

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