Job.setoutputkeyclass and Job.setmapoutputkeyclass in Hadoop

Source: Internet
Author: User

Beginner Mr, feel nothing, but learned for a period of time, re-review of the procedures found in the application of Mr Procedures will generally have

Job.setoutputkeyclass (Theclass) and Job.setoutputvalueclass (Theclass) in Hadoop,

However, some programs deal with the above two Job.setmapoutputkeyclass (Theclass) and Job.setmapou

Tputvalueclass (Text.class), has not understood what is going on, online check the next, the original when mapper and reducer

can be used Job.setoutputkeyclass (Theclass) with Job.setoutputvalueclass when the output type is consistent

(Theclass) These two are configured, but when Mapper is used for reducer two output types that are inconsistent, you need to

To be configured separately.

Job.setoutputkeyclass and Job.setmapoutputkeyclass in Hadoop

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