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What is identity mapper and reducer?

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What is identity mapper and reducer?

New Contributor

What is identity mapper and reducer?

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Re: What is identity mapper and reducer?

New Contributor

Identity mapper and reducer are default mapper and reducer which are picked up by the map-reduce framework when no mapper or reducer class is defined in driver class. They do not do any type of processing in the data and write the value to the output which it gets from the input.