1.

Name and syntax for core methods of Reducer?

Answer»

Name and syntax for core methods of Reducer?
Below are the three core methods of reducer which is given below
(1)SETUP():-We used this METHOD for configure various parameter like INPUT data size and distributed cache. And syntax is given below.
public void setup (context)

(2)reduce():-HEART of the Reducer is always CALLED once per key with the associated reduced task.
public void reduce(Key, Value, context)

(3)cleanup():-We used this method to clean the temporary files once at the end of the task
public void cleanup (context)



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