hadoop: Reducer output to another Reducer

Question

Is it possible to send output of a Reducer directly to another reducer if we want to group by the same key ( output of the first reducer )

Sometimes while chaining i observe that i am using a mapper just to read from input and copy same to output. Hence wondering idf it is possible to fed the output directly to reducer

frail · Accepted Answer · 2012-09-21 14:26:37Z

7

Although you can chain map-reduce jobs, even mappers, together; as far as I know you can not chain reducers directly.

Internally you can chain mappers before reducer with ChainMapper and chain Mappers after reducer with ChainReducer.

answered Sep 21, 2012 at 14:26

frail

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