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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
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.