Core methods of Reducer

Writen by Devil 1:26 PM - 0 Comments

The three core methods of a Reducer are:

1. setup(): this method is used for configuring various parameters like input data size, distributed cache.
   public void setup (context)
2. reduce(): heart of the reducer always called once per key with the associated reduced task
   public void reduce(Key, Value, context)
3. cleanup(): this method is called to clean temporary files, only once at the end of the task
   public void cleanup (context)

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