Minor Description
Looking at test class ClusterMapReduceTestCase it issues a warning that the dfsCluster = new MiniDFSCluster(conf, 2, reformatDFS, null); line of code is deprecated and MiniDFSCluster.Builder should be used instead. It notes that the current API will be phased out in version 24. I propose to update the test class to the most up to date code as it's referenced several places on the internet as an example of how to write a Hadoop Unit Test.