$4.$ In Hadoop, the default Partitioner has the following getPartition$()$ method:

public int getPartition$($K key, V value, int numReduceTasks$)\{$ return $($key$.$hashCode$()$ & Integer.MAX$\_$VALUE$)\%$ numReduceTasks;

$\}$

For a Hadoop cluster with $25$ idle DataNodes, discuss the suitability of the above Partitioner when running Hadoop$$s standard WordCount implementation over the following four input text files, respectively.

Hint: For each input file, please compare the number of unique intermediate keys and the number of available reducers in the cluster.