Category Combiner

Implementing Partitioners and Combiners for MapReduce

Partitioners and Combiners in MapReduce Partitioners are responsible for dividing up the intermediate key space and assigning intermediate key-value pairs to reducers. In other words, the partitioner specifies the task to which an intermediate key-value pair must be copied. Within each reducer, keys are processed in sorted order. Combiners are an optimization in MapReduce that […]