Neha Bhakat

Write a case for Partitioner
Partitioner run in the intermediate step between map and reduce tasks.It works like a condition in processing an input dataset.Partitioner defines how many reducer is needed.that’s means it will divide the data according to the number of reducer.
A partitioner partitions the key-value pairs of intermediate Map-outputs. It partitions the data using a user-defined condition, which works like a hash function.If we don’t define partitioner by default hashpartition will be called.